JP2023027333A - Digital broadcast modulated wave transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for more appropriately transmitting or receiving advanced digital broadcasting services.

SOLUTION: The digital broadcast modulated wave transmission method includes: transmitting a combined wave obtained by combining an upper layer modulated wave and a lower layer modulated wave having different transmission power in the same frequency band; changing a difference between transmission power of the upper layer modulated wave and transmission power of the lower layer modulated wave; and transmitting information on the difference in the transmission power by including the information in either the upper layer modulated wave or the lower layer modulated wave.

SELECTED DRAWING: Figure 2A

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to broadcast transmission technology or broadcast reception technology.

In the late 1990s, digital broadcasting services began in many countries in place of conventional analog broadcasting services. Digital broadcasting services are improving broadcasting quality using error correction technology, multi-channel and HD (High Definition) using compression coding technology, BML (Broadcast Markup Language) and HTML5 (Hyper Text Markup Language version 5). We realized the multimediaization of the services used.

In recent years, advanced digital broadcasting systems are being studied in various countries for the purpose of further improving the efficiency of frequency use, increasing the resolution, and increasing the functionality.

JP 2016-14420 A

More than 10 years have already passed since the current digital broadcasting service started, and broadcast receivers capable of receiving the current digital broadcasting service are widely used. For this reason, compatibility with the current digital broadcasting service must be taken into consideration when starting the advanced digital broadcasting service currently under study. In other words, it is preferable to implement UHD (Ultra High Definition) video signals while maintaining the viewing environment of current digital broadcasting services.

There is a system described in Patent Literature 1 as a technique for realizing UHD broadcasting in digital broadcasting services. However, the system described in Patent Document 1 is intended to replace the current digital broadcasting, and does not take into consideration the maintenance of the viewing environment for the current digital broadcasting service.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique for more preferably transmitting or receiving advanced digital broadcasting services with higher functions, taking compatibility with existing digital broadcasting services into consideration.

As means for solving the above problems, the technology described in the claims is used.

To give an example, a method of transmitting a digital broadcast modulated wave in a digital broadcasting system, comprising a transmission step of transmitting a composite wave obtained by synthesizing an upper layer modulated wave and a lower layer modulated wave having different transmission powers in the same frequency band; , information transmission for transmitting information related to a date and time for changing the difference in transmission power between the upper hierarchical modulated wave and the lower hierarchical modulated wave in either the upper hierarchical modulated wave or the lower hierarchical modulated wave; and a transmission power changing step of changing a difference in transmission power between the upper hierarchical modulated wave and the lower hierarchical modulated wave.

ADVANTAGE OF THE INVENTION According to this invention, the technique which transmits or receives advanced digital broadcasting service more suitably can be provided.

1 is a system configuration diagram of a broadcasting system according to an embodiment of the present invention; FIG. 1 is a block diagram of a broadcast receiver according to one embodiment of the present invention; FIG. 3 is a detailed block diagram of the first tuner/demodulator of the broadcast receiver according to one embodiment of the present invention; FIG. FIG. 4 is a detailed block diagram of the second tuner/demodulator of the broadcast receiver according to one embodiment of the present invention; FIG. 4 is a detailed block diagram of the third tuner/demodulator of the broadcast receiver according to one embodiment of the present invention; FIG. 4 is a detailed block diagram of a fourth tuner/demodulator of the broadcast receiver according to one embodiment of the present invention; FIG. 3 is a detailed block diagram of the first decoder section of the broadcast receiver according to one embodiment of the present invention; FIG. 4 is a detailed block diagram of the second decoder section of the broadcast receiver according to one embodiment of the present invention; 1 is a software configuration diagram of a broadcast receiving apparatus according to an embodiment of the present invention; FIG. 1 is a configuration diagram of a broadcasting station server according to an embodiment of the present invention; FIG. It is a block diagram of a service provider server according to one embodiment of the present invention. It is a figure explaining the segment structure which concerns on the digital broadcasting of one Example of this invention. FIG. 3 is a diagram illustrating hierarchical allocation in hierarchical transmission related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining processing for generating OFDM transmission waves related to digital broadcasting according to an embodiment of the present invention; FIG. 2 is a diagram for explaining the basic configuration of a transmission line coding unit related to digital broadcasting according to one embodiment of the present invention; FIG. 4 is a diagram illustrating OFDM segment parameters for digital broadcasting according to an embodiment of the present invention; FIG. 2 is a diagram illustrating transmission signal parameters related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram illustrating the arrangement of pilot signals in synchronous modulation segments related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram illustrating the arrangement of pilot signals in differentially modulated segments related to digital broadcasting according to an embodiment of the present invention; FIG. 2 is a diagram illustrating bit allocation of TMCC carriers related to digital broadcasting according to an embodiment of the present invention; It is a figure explaining the bit allocation of the TMCC information which concerns on the digital broadcasting of one Example of this invention. FIG. 4 is a diagram illustrating transmission parameter information of TMCC information related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram illustrating system identification of TMCC information related to digital broadcasting according to an embodiment of the present invention; FIG. 2 is a diagram illustrating a carrier modulation mapping scheme of TMCC information related to digital broadcasting according to one embodiment of the present invention; It is a figure explaining the frequency conversion process identification of the TMCC information which concerns on the digital broadcasting of one Example of this invention. FIG. 4 is a diagram explaining physical channel number identification of TMCC information related to digital broadcasting according to an embodiment of the present invention; It is a figure explaining an example of the main signal identification of the TMCC information concerning the digital broadcasting of one Example of this invention. FIG. 3 is a diagram illustrating 4K signal transmission layer identification of TMCC information related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram illustrating additional layer transmission identification of TMCC information related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining identification of a coding rate of an inner code of TMCC information related to digital broadcasting according to one embodiment of the present invention; FIG. 4 is a diagram illustrating bit allocation of AC signals for digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining configuration identification of an AC signal related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining seismic motion warning information of an AC signal related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining signal identification of seismic motion warning information of an AC signal related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining seismic motion warning detailed information of AC signal seismic motion warning information related to digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining seismic motion warning detailed information of AC signal seismic motion warning information related to digital broadcasting according to an embodiment of the present invention; FIG. 3 is a diagram for explaining additional information regarding transmission control of modulated waves of AC signals for digital broadcasting according to an embodiment of the present invention; FIG. 4 is a diagram for explaining transmission parameter additional information of an AC signal related to digital broadcasting according to one embodiment of the present invention; FIG. 2 is a diagram illustrating an AC signal error correction system for digital broadcasting according to an embodiment of the present invention; It is a figure explaining the NUC format of the AC signal concerning the digital broadcasting of one Example of this invention. 1 is a diagram illustrating a dual-polarization transmission system according to an embodiment of the present invention; FIG. 1 is a system configuration diagram of a broadcasting system using a dual-polarization transmission system according to an embodiment of the present invention; FIG. 1 is a system configuration diagram of a broadcasting system using a dual-polarization transmission system according to an embodiment of the present invention; FIG. It is a figure explaining the frequency conversion process which concerns on one Example of this invention. 1 is a diagram illustrating the configuration of a pass-through transmission system according to an embodiment of the present invention; FIG. FIG. 4 is a diagram illustrating pass-through transmission bands according to an embodiment of the present invention; 1 is a diagram illustrating the configuration of a pass-through transmission system according to an embodiment of the present invention; FIG. FIG. 4 is a diagram illustrating pass-through transmission bands according to an embodiment of the present invention; FIG. 4 is a diagram illustrating pass-through transmission bands according to an embodiment of the present invention; 1 is a diagram for explaining a hierarchical division multiplexing transmission system according to an embodiment of the present invention; FIG. 1 is a system configuration diagram of a broadcasting system using a hierarchical division multiplexing transmission system according to an embodiment of the present invention; FIG. It is a figure explaining the frequency conversion amplification process based on one Example of this invention. FIG. 2 is a diagram illustrating a protocol stack of MPEG-2 TS; FIG. 2 is a diagram for explaining the names and functions of tables used in MPEG-2 TS; FIG. 2 is a diagram for explaining the names and functions of tables used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram for explaining names and functions of descriptors used in MPEG-2 TS; FIG. 2 is a diagram illustrating a protocol stack in an MMT broadcast transmission path; FIG. 2 is a diagram illustrating a protocol stack in an MMT communication line; FIG. FIG. 4 is a diagram for explaining the names and functions of tables used in MMT TLV-SI; FIG. 4 is a diagram for explaining names and functions of descriptors used in MMT TLV-SI; FIG. 2 is a diagram for explaining names and functions of messages used in MMT-SI of MMT; FIG. 4 is a diagram for explaining names and functions of tables used in MMT-SI of MMT; FIG. 4 is a diagram for explaining names and functions of descriptors used in MMT-SI of MMT; FIG. 4 is a diagram for explaining names and functions of descriptors used in MMT-SI of MMT; FIG. 4 is a diagram for explaining names and functions of descriptors used in MMT-SI of MMT; FIG. 3 is a diagram for explaining the relationship between MMT data transmission and each table; 4 is an operation sequence diagram of channel setting processing of the broadcast receiving apparatus 100 according to one embodiment of the present invention; FIG. 4 is a diagram for explaining the data configuration of a network information table; FIG. FIG. 4 is a diagram for explaining the data structure of a terrestrial distribution system descriptor; FIG. 4 is a diagram for explaining the data structure of a service list descriptor; FIG. 4 is a diagram for explaining the data structure of a TS information descriptor; 1 is an external view of a remote controller according to one embodiment of the present invention; FIG. FIG. 5 is a diagram illustrating banner display when selecting a channel according to an embodiment of the present invention; It is a figure explaining an example of the reception range of hierarchical division multiplexing digital terrestrial broadcasting. FIG. 2 is a diagram for explaining an example of a modulated wave of hierarchical division multiplexing digital terrestrial broadcasting; FIG. 4 is a diagram for explaining an example of transmission parameter additional information of an AC signal related to digital broadcasting according to one embodiment of the present invention; FIG. 4 is a diagram illustrating an example of identification of an injection level state of an AC signal related to digital broadcasting according to one embodiment of the present invention; FIG. 4 is a diagram illustrating an example of identification of an injection level state of an AC signal related to digital broadcasting according to one embodiment of the present invention; FIG. 4 is an explanatory diagram of an example of an operation sequence of rescan processing of the broadcast receiving apparatus 100 according to one embodiment of the present invention; FIG. 2 is a diagram for explaining modulated waves of hierarchical division multiplexing digital terrestrial broadcasting;

Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings.

(Example 1)
[System configuration]
FIG. 1 is a system configuration diagram showing an example of the configuration of a broadcasting system.

The broadcasting system includes, for example, a broadcast receiving apparatus 100, an antenna 200, a radio tower 300 of a broadcasting station, a broadcasting station server 400, a service provider server 500, a mobile phone communication server 600, a base station 600B of a mobile phone communication network, and a mobile phone. It is composed of an information terminal 700, a broadband network 800 such as the Internet, and a router device 800R. Various server devices and communication devices may be further connected to the Internet 800 .

The broadcast receiving apparatus 100 is a television receiver having a function of receiving advanced digital broadcasting services. The broadcast receiving apparatus 100 may further have a reception function for existing digital broadcast services. Furthermore, by linking functions using broadband networks to digital broadcasting services (existing digital broadcasting services or advanced digital broadcasting services), acquisition of additional content via broadband networks, arithmetic processing in server devices, and cooperation with mobile terminal devices It is possible to correspond to a broadcasting and communication cooperation system that combines presentation processing and the like with digital broadcasting services. Broadcast receiving apparatus 100 receives digital broadcast waves transmitted from radio tower 300 via antenna 200 . The digital broadcast wave may be directly transmitted from the radio tower 300 to the antenna 200, or may be transmitted via a broadcasting satellite, communication satellite, or the like (not shown). A broadcast signal retransmitted by a cable television station may be received via a cable line or the like. Broadcast receiving apparatus 100 can be connected to Internet 800 via router apparatus 800R, and can transmit and receive data through communication with each server apparatus on Internet 800. FIG.

The router device 800R is connected to the Internet 800 by wireless communication or wired communication, is connected to the broadcast receiving device 100 by wired communication, and is connected to the portable information terminal 700 by wireless communication. As a result, each server device on the Internet 800, the broadcast receiving device 100, and the portable information terminal 700 can mutually transmit and receive data via the router device 800R. Router device 800R, broadcast receiving device 100, and mobile information terminal 700 form a LAN (Local Area Network). Note that the communication between the broadcast receiving device 100 and the mobile information terminal 700 may be performed directly by a method such as BlueTooth (registered trademark) or NFC (Near Field Communication) without going through the router device 800R.

The radio tower 300 is broadcasting equipment of a broadcasting station, and transmits digital broadcasting waves including various control information related to digital broadcasting services, content data of broadcasting programs (video content, audio content, etc.) and the like. The broadcasting station also has a broadcasting station server 400 . The broadcast station server 400 stores content data of broadcast programs and metadata such as program titles, program IDs, program summaries, performers, and broadcast dates and times of each broadcast program. The broadcasting station server 400 provides the content data and metadata to the service provider based on the contract. Content data and metadata are provided to the service provider through an API (Application Programming Interface) of the broadcasting station server 400 .

The service provider server 500 is a server device prepared by the service provider to provide services by the broadcast-communication cooperation system. The service provider server 500 stores, manages, and stores content data and metadata provided by the broadcasting station server 400, and content data and applications (operating programs and/or various data, etc.) produced for the broadcast and communication collaboration system. distribution, etc. It also has a function of searching for applications that can be provided and providing a list in response to an inquiry from a television receiver. Note that the storage, management, distribution, etc. of the content data and metadata and the storage, management, distribution, etc. of the application may be performed by different server devices. The broadcasting station and the service provider may be the same or may be different providers. A plurality of service provider servers 500 may be prepared for different services. Also, the functions of the service provider server 500 may be provided by the broadcasting station server 400 .

The mobile telephone communication server 600 is connected to the Internet 800, and is also connected to the mobile information terminal 700 via the base station 600B. The mobile telephone communication server 600 manages telephone communication (call) and data transmission/reception via the mobile telephone communication network of the mobile information terminal 700, and transmits data by communication between the mobile information terminal 700 and each server device on the Internet 800. can be sent and received. Communication between portable information terminal 700 and broadcast receiving apparatus 100 may be performed via base station 600B, mobile telephone communication server 600, Internet 800, and router apparatus 800R.

[Hardware Configuration of Broadcast Receiver]
FIG. 2A is a block diagram showing an example of the internal configuration of the broadcast receiving apparatus 100. As shown in FIG.

Broadcast receiving apparatus 100 includes main control unit 101, system bus 102, ROM 103, RAM 104, storage (accumulation) unit 110, LAN communication unit 121, expansion interface unit 124, digital interface unit 125, first tuner/demodulation unit 130C, second Second tuner/demodulator 130T, third tuner/demodulator 130L, fourth tuner/demodulator 130B, first decoder 140S, second decoder 140U, operation input unit 180, video selector 191, monitor 192, video It is composed of an output unit 193 , an audio selection unit 194 , a speaker unit 195 and an audio output unit 196 .

The main control section 101 is a microprocessor unit that controls the entire broadcast receiving apparatus 100 according to a predetermined operation program. A system bus 102 is a communication path for transmitting and receiving various data, commands, etc. between the main control unit 101 and each operation block in the broadcast receiving apparatus 100 .

A ROM (Read Only Memory) 103 is a non-volatile memory that stores a basic operation program such as an operating system and other operation programs. Used. Further, the ROM 103 stores operation setting values and the like necessary for the operation of the broadcast receiving apparatus 100 . A RAM (Random Access Memory) 104 serves as a work area for executing the basic operating program and other operating programs. The ROM 103 and the RAM 104 may be configured integrally with the main control section 101 . Also, the ROM 103 may use a partial storage area in the storage (accumulation) section 110 instead of having an independent configuration as shown in FIG. 2A.

The storage (accumulation) unit 110 stores an operation program and operation setting values of the broadcast receiving device 100, personal information of the user of the broadcast receiving device 100, and the like. Further, it is possible to store an operation program downloaded via the Internet 800 and various data created by the operation program. In addition, content such as moving images, still images, and audio obtained from broadcast waves or downloaded via the Internet 800 can also be stored. A partial area of the storage (accumulation) unit 110 may be used to replace all or part of the functions of the ROM 103 . In addition, the storage (accumulation) unit 110 needs to retain stored information even when power is not supplied to the broadcast receiving apparatus 100 from the outside. Therefore, devices such as semiconductor element memories such as flash ROMs and SSDs (Solid State Drives) and magnetic disk drives such as HDDs (Hard Disc Drives) are used.

The operation programs stored in the ROM 103 and the storage (accumulation) unit 110 can be added, updated, and expanded in function by downloading from each server device on the Internet 800 or broadcast waves.

The LAN communication unit 121 is connected to the Internet 800 via the router device 800R, and transmits and receives data to and from each server device on the Internet 800 and other communication devices. It also acquires content data (or part thereof) of a program transmitted via a communication line. The connection with the router device 800R may be a wired connection or a wireless connection such as Wi-Fi (registered trademark). The LAN communication unit 121 includes an encoding circuit, a decoding circuit, and the like. Also, the broadcast receiving apparatus 100 may further include other communication units such as a BlueTooth (registered trademark) communication unit, an NFC communication unit, an infrared communication unit, and the like.

The first tuner/demodulator 130C, the second tuner/demodulator 130T, the third tuner/demodulator 130L, and the fourth tuner/demodulator 130B each receive broadcast waves of the digital broadcasting service, A channel selection process (channel selection) is performed by tuning to a channel of a predetermined service based on the control. Furthermore, it performs demodulation processing, waveform shaping processing, etc. of the modulated wave of the received signal, reconstruction processing of the frame structure and hierarchical structure, energy despreading processing, error correction decoding processing, etc., and reproduces the packet stream. It also extracts and decodes a transmission multiplexing configuration control (TMCC) signal from the received signal.

The first tuner/demodulator 130C can receive digital broadcast waves of the current digital terrestrial broadcasting service received by the antenna 200C, which is an antenna for receiving the current digital terrestrial broadcasting. In addition, the first tuner/demodulator 130C inputs a broadcast signal of one of the horizontal (H) polarized wave signal and the vertical (V) polarized wave signal of dual-polarization terrestrial digital broadcasting, which will be described later. It is also possible to demodulate the segments of the hierarchy that adopt the same modulation scheme of the digital terrestrial broadcasting service. Also, the first tuner/demodulator 130C can input a broadcast signal of layer division multiplexing digital terrestrial broadcasting, which will be described later, and demodulate a layer that employs the same modulation scheme as the current digital terrestrial broadcasting service. The second tuner/demodulator 130T inputs the digital broadcast wave of the advanced digital terrestrial broadcasting service received by the antenna 200T, which is a dual-polarization antenna for receiving digital terrestrial broadcasting, via the converter 201T. The third tuner/demodulator 130L inputs the digital broadcast wave of the advanced digital terrestrial broadcasting service received by the antenna 200L, which is an antenna for receiving hierarchical division multiplexing digital terrestrial broadcasting, via the converter 201L. The fourth tuner/demodulator 130B converts the digital broadcast wave of the advanced BS (Broadcasting Satellite) digital broadcasting service or the advanced CS (Communication Satellite) digital broadcasting service received by the antenna 200B, which is a BS/CS shared reception antenna, into a converting unit. 201B.

The expression "tuner/demodulator" means a component having a tuner function and a demodulator function.

Further, antenna 200C, antenna 200T, antenna 200L, antenna 200B, conversion unit 201T, conversion unit 201L, and conversion unit 201B do not constitute a part of broadcast receiving apparatus 100, and are installed in the building where broadcast receiving apparatus 100 is installed. It belongs to the equipment side such as.

In addition, the current digital terrestrial broadcasting described above is a broadcasting signal of a digital terrestrial broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels×1080 vertical pixels.

In addition, the details of dual-polarization terrestrial digital broadcasting (advanced terrestrial digital broadcasting that uses dual-polarization transmission method) will be described later, but it is possible to transmit images with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels. It is a broadcasting signal of terrestrial digital broadcasting service. Dual-polarization digital terrestrial broadcasting is digital terrestrial broadcasting that uses multiple polarizations of horizontal (H) polarization and vertical (V) polarization. This segment transmits terrestrial digital broadcasting services capable of transmitting video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels.

In the description of each embodiment of the present invention, when the expression "multiple polarized waves" is used for dual-polarization terrestrial digital broadcasting, unless otherwise specified, horizontal (H) polarized waves and vertical (V) polarized waves are used. We mean the two polarizations of the wave. Moreover, even when the expression "polarized wave" is simply used, it means "polarized wave signal". In addition, in one or both of the multiple polarized waves, some of the divided segments transmit video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels. can be transmitted with That is, in the dual-polarization digital terrestrial broadcasting, the current terrestrial digital broadcasting service that transmits video with a maximum resolution of horizontal 1920 pixels × vertical 1080 pixels in a plurality of segments with different polarizations in each embodiment of the present invention, and horizontal It is possible to simultaneously transmit terrestrial digital broadcasting services capable of transmitting video with a maximum resolution exceeding 1920 pixels×1080 vertical pixels.

In addition, although the details of the hierarchical division multiplexing digital terrestrial broadcasting (advanced terrestrial digital broadcasting employing the hierarchical division multiplexing transmission method) will be described later, it is possible to transmit video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels. It is a broadcasting signal of terrestrial digital broadcasting service. Hierarchical division multiplexing digital terrestrial broadcasting multiplexes a plurality of digital broadcasting signals with different signal levels. Digital broadcasting signals with different signal levels mean different powers for transmitting the digital broadcasting signals. Hierarchical division multiplexing digital terrestrial broadcasting of each embodiment of the present invention is broadcast of the current terrestrial digital broadcasting service that transmits video with maximum resolution of horizontal 1920 pixels × vertical 1080 pixels as a plurality of digital broadcasting signals with different signal levels. It is possible to hierarchically multiplex and transmit a signal and a broadcast signal of a terrestrial digital broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels×1080 vertical pixels in the frequency band of the same physical channel. That is, in the hierarchical division multiplexing digital terrestrial broadcasting of each embodiment of the present invention, the current terrestrial digital broadcasting service transmitting video with a maximum resolution of horizontal 1920 pixels×vertical 1080 pixels in a plurality of layers with different signal levels, and horizontal It is possible to simultaneously transmit terrestrial digital broadcasting services capable of transmitting video with a maximum resolution exceeding 1920 pixels×1080 vertical pixels.

It should be noted that the broadcast receiver in each embodiment of the present invention may be configured so as to be able to suitably receive advanced digital broadcasts. It is not essential to have all of section 130L and fourth tuner/demodulator section 130B. For example, at least one of the second tuner/demodulator 130T and the third tuner/demodulator 130L may be provided. Further, in order to realize more advanced functions, one or more of the above four tuner/demodulators may be provided in addition to either the second tuner/demodulator 130T or the third tuner/demodulator 130L. good.

Also, the antenna 200C, the antenna 200T, and the antenna 200L may be used as appropriate. Further, among the first tuner/demodulator 130C, the second tuner/demodulator 130T, and the third tuner/demodulator 130L, a plurality of tuners/demodulators may be combined (or integrated) as appropriate.

The first decoder section 140S and the second decoder section 140U are respectively output from the first tuner/demodulator section 130C, the second tuner/demodulator section 130T, the third tuner/demodulator section 130L, and the fourth tuner/demodulator section 130B. A packet stream or a packet stream obtained from each server device on the Internet 800 via the LAN communication unit 121 is input. The packet stream input to the first decoder unit 140S and the second decoder unit 140U is MPEG (Moving Picture Experts Group)-2 TS (Transport Stream), MPEG-2 PS (Program Stream), TLV (Type Length Value), MMT (MPEG Media Transport), etc. format packet stream.

The first decoder unit 140S and the second decoder unit 140U respectively perform conditional access (CA) processing, and extract video data, audio data, and various information data from the packet stream based on various control information included in the packet stream. Demultiplexing processing to separate and extract video data and audio data, acquisition of program information and EPG (Electronic Program Guide) generation processing, data broadcasting screen and multimedia data playback processing, etc. . It also performs a process of superimposing the generated EPG or the reproduced multimedia data on the decoded video data or audio data.

The image selection unit 191 receives the image data output from the first decoder unit 140S and the image data output from the second decoder unit 140U, and appropriately selects and/or superimposes them based on the control of the main control unit 101. process. In addition, the video selection unit 191 appropriately performs scaling processing, OSD (On Screen Display) data superimposition processing, and the like. The monitor unit 192 is, for example, a display device such as a liquid crystal panel, displays the video data selected and/or superimposed by the video selection unit 191, and provides the user of the broadcast receiving apparatus 100 with the video data. The video output unit 193 is a video output interface that outputs video data selected and/or superimposed by the video selection unit 191 to the outside.

The audio selection unit 194 receives the audio data output from the first decoder unit 140S and the audio data output from the second decoder unit 140U, and appropriately selects and/or mixes them under the control of the main control unit 101. process. The speaker unit 195 outputs the audio data selected and/or mixed by the audio selection unit 194 and provides it to the user of the broadcast receiving apparatus 100 . The audio output unit 196 is an audio output interface that outputs audio data selected and/or mixed by the audio selection unit 194 to the outside.

The digital interface unit 125 is an interface that outputs or inputs a packet stream containing encoded digital video data and/or digital audio data. The digital interface unit 125 is configured such that the first decoder unit 140S and the second decoder unit 140U are connected to the first tuner/demodulator unit 130C, the second tuner/demodulator unit 130T, the third tuner/demodulator unit 130L and the fourth tuner/demodulator unit 130B. The input packet stream can be output as is. Also, a packet stream input from the outside via the digital interface unit 125 may be controlled to be input to the first decoder unit 140S and the second decoder unit 140U, or stored in the storage unit 110. FIG. Alternatively, the video data and audio data separated and extracted by the first decoder section 140S and the second decoder section 140U may be output. Further, video data and audio data input from the outside via the digital interface unit 125 may be controlled to be input to the first decoder unit 140S and the second decoder unit 140U and stored in the storage (accumulation) unit 110. good.

The expansion interface unit 124 is a group of interfaces for expanding the functions of the broadcast receiving apparatus 100, and includes an analog video/audio interface, a USB (Universal Serial Bus) interface, a memory interface, and the like. The analog video/audio interface inputs analog video/audio signals from an external video/audio output device, outputs analog video/audio signals to an external video/audio input device, and the like. The USB interface is connected to a PC or the like to transmit and receive data. An HDD may be connected to record broadcast programs and other content data. Also, a keyboard or other USB devices may be connected. A memory interface connects a memory card or other memory medium to transmit and receive data.

The operation input unit 180 is an instruction input unit for inputting an operation instruction to the broadcast receiving apparatus 100, and is operated by arranging a remote control receiving unit for receiving commands transmitted from a remote controller (not shown) and a button switch. consists of keys. Only one of them may be used. Also, the operation input unit 180 can be replaced by a touch panel or the like that is superimposed on the monitor unit 192 . A keyboard or the like connected to the expansion interface section 124 may be substituted. The remote control can be replaced by a mobile information terminal 700 having a remote control command transmission function.

Note that if the broadcast receiving apparatus 100 is a television receiver or the like, the video output section 193 and the audio output section 196 are not essential components. Broadcast receiving apparatus 100 may be an optical disk drive recorder such as a DVD (Digital Versatile Disc) recorder, a magnetic disk drive recorder such as an HDD recorder, a STB (Set Top Box), or the like. A PC (Personal Computer), a tablet terminal, or the like having a reception function for digital broadcasting services may be used. If broadcast receiving apparatus 100 is a DVD recorder, HDD recorder, STB, or the like, monitor section 192 and speaker section 195 are not essential components. By connecting an external monitor and an external speaker to the video output section 193 and the audio output section 196 or the digital interface section 125, the same operation as a television receiver or the like can be performed.

FIG. 2B is a block diagram showing an example of the detailed configuration of the first tuner/demodulator 130C.

The channel selection/detection unit 131C receives the current digital broadcast wave received by the antenna 200C and selects a channel based on the channel selection control signal. A TMCC decoding unit 132C extracts a TMCC signal from the output signal of the channel selection/detection unit 131C and acquires various TMCC information. The acquired TMCC information is used to control each subsequent process. Details of the TMCC signal and TMCC information will be described later.

The demodulator 133C inputs a modulated wave modulated using a scheme such as QPSK (Quadrature Phase Shift Keying), DQPSK (Differential QPSK), 16QAM (Quadrature Amplitude Modulation), 64QAM, etc. based on TMCC information, It performs demodulation processing including frequency deinterleaving, time deinterleaving, carrier demapping processing, and the like. The demodulation unit 133C may be capable of further supporting modulation schemes different from the modulation schemes described above.

The stream reproduction unit 134C performs layer division processing, inner code error correction processing such as Viterbi decoding, energy despreading processing, stream reproduction processing, outer code error correction processing such as RS (Reed Solomon) decoding, and the like. As the error correction processing, a method different from the methods described above may be used. Also, the packet stream reproduced and output by the stream reproduction unit 134C is, for example, MPEG-2 TS or the like. It may be a packet stream of other formats.

FIG. 2C is a block diagram showing an example of the detailed configuration of the second tuner/demodulator 130T.

The channel selection/detection unit 131H receives the horizontal (H) polarized wave signal of the digital broadcast wave received by the antenna 200T, and selects a channel based on the channel selection control signal. The channel selection/detection unit 131V receives the vertical (V) polarized wave signal of the digital broadcast wave received by the antenna 200T, and selects a channel based on the channel selection control signal. The operation of channel selection processing in the tuning/detection unit 131H and the operation of channel selection processing in the tuning/detection unit 131V may be controlled in conjunction with each other, or may be controlled independently. That is, regarding the channel selection/detection unit 131H and the channel selection/detection unit 131V as one channel selection/detection unit, one of the digital broadcasting services transmitted using both horizontal/vertical polarized waves is used. It is also possible to control so as to select two channels. Assuming that the channel selection/detection unit 131H and the channel selection/detection unit 131V are two independent channel selection/detection units, only horizontal polarization (or It is also possible to perform control so as to select two different channels of a digital broadcasting service transmitted using only vertically polarized waves.

It should be noted that the horizontal (H) polarized wave signal and the vertical (V) polarized wave signal received by the second tuner/demodulator 130T of the broadcast receiving apparatus in each embodiment of the present invention are broadcast waves whose polarization directions differ by approximately 90 degrees. Any polarized wave signal may be used, and the horizontal (H) polarized wave signal, the vertical (V) polarized wave signal, and the reception of the signals described below may be reversed.

A TMCC decoding unit 132H extracts a TMCC signal from the output signal of the channel selection/detection unit 131H and acquires various TMCC information. A TMCC decoding unit 132V extracts a TMCC signal from the output signal of the channel selection/detection unit 131V and acquires various TMCC information. Only one of the TMCC decoding unit 132H and the TMCC decoding unit 132V may be provided. The acquired TMCC information is used to control each subsequent process.

BPSK (Binary Phase Shift Keying), DBPSK (Differential BPSK), QPSK, DQPSK, 8PSK (Phase Shift Keying), 16APSK (Amplitude and Phase Keying), respectively, based on TMCC information and the like. ), 32APSK, 16QAM, 64QAM, 256QAM, 1024QAM, etc. are input, and demodulation processing including frequency deinterleaving, time deinterleaving and carrier demapping processing is performed. The demodulation section 133H and the demodulation section 133V may be capable of further supporting modulation schemes different from the modulation schemes described above.

The stream reproducing unit 134H and the stream reproducing unit 134V perform layer division processing, inner code error correction processing such as Viterbi decoding and LDPC (Low Density Parity Check) decoding, energy despreading processing, stream reproduction processing, RS decoding and BCH decoding, respectively. Outer code error correction processing, etc. are performed. As the error correction processing, a method different from the methods described above may be used. Also, the packet stream reproduced and output by the stream reproducing unit 134H is, for example, MPEG-2 TS or the like. The packet stream reproduced and output by the stream reproducing unit 134V is, for example, TLV including MPEG-2 TS or MMT packet stream. Each may be a packet stream of other formats.

FIG. 2D is a block diagram showing an example of the detailed configuration of the third tuner/demodulator 130L.

The channel selection/detection unit 131L receives a digital broadcast wave subjected to layered division multiplexing (LDM) processing from the antenna 200L and selects a channel based on a channel selection control signal. The digital broadcast wave subjected to hierarchical division multiplexing is a digital broadcast service in which the modulated wave of the upper layer (UL) and the modulated wave of the lower layer (LL) are different (or the same broadcast service is different) channel). Also, the modulated wave of the upper layer is output to the demodulator 133S, and the modulated wave of the lower layer is output to the demodulator 133L.

The TMCC decoding unit 132L receives the upper layer modulated wave and the lower layer modulated wave output from the channel selection/detection unit 131L, extracts the TMCC signal, and obtains various TMCC information. The signal input to the TMCC decoding unit 132L may be only one of the upper layer modulated wave and the lower layer modulated wave.

Since the demodulators 133S and 133L perform the same operations as the demodulators 133H and 133V, detailed description thereof will be omitted. Further, since the stream reproducing unit 134S and the stream reproducing unit 134L perform the same operation as the stream reproducing unit 134H and the stream reproducing unit 134V, respectively, detailed description thereof will be omitted.

FIG. 2E is a block diagram showing an example of the detailed configuration of the fourth tuner/demodulator 130B.

The channel selection/detection unit 131B receives the digital broadcast wave of the advanced BS digital broadcast service or the advanced CS digital broadcast service received by the antenna 200B, and selects a channel based on the channel selection control signal. Since other operations are the same as those of the channel selection/detection section 131H and the channel selection/detection section 131V, detailed description thereof will be omitted. Further, the TMCC decoding unit 132B, the demodulation unit 133B, and the stream reproduction unit 134B also perform the same operation as the TMCC decoding unit 132H, the TMCC decoding unit 132V, the demodulation unit 133H, the demodulation unit 133V, and the stream reproduction unit 134V, respectively. Description is omitted.

FIG. 2F is a block diagram showing an example of the detailed configuration of the first decoder section 140S.

Under the control of the main control unit 101, the selection unit 141S selects the packet stream input from the first tuner/demodulation unit 130C, the packet stream input from the second tuner/demodulation unit 130T, and the input from the third tuner/demodulation unit 130L. One of the packet streams is selected and output. Packet streams input from the first tuner/demodulator 130C, the second tuner/demodulator 130T, and the third tuner/demodulator 130L are, for example, MPEG-2 TS. The CA descrambler 142S performs descrambling processing of a predetermined scramble system encryption algorithm based on various control information relating to conditional access superimposed on the packet stream.

The demultiplexer 143S is a stream decoder, and separates and extracts video data, audio data, superimposed text data, caption data, program information data, etc. based on various control information contained in the input packet stream. The separated and extracted video data is distributed to the video decoder 145S, the separated and extracted audio data is distributed to the audio decoder 146S, and the separated and extracted superimposed character data, caption data, program information data, etc. are distributed to the data decoder 144S. A packet stream (for example, MPEG-2 PS, etc.) obtained from a server device on the Internet 800 via the LAN communication unit 121 may be input to the demultiplexing unit 143S. Further, the demultiplexing unit 143S can output the packet streams input from the first tuner/demodulator 130C, the second tuner/demodulator 130T, and the third tuner/demodulator 130L to the outside via the digital interface 125. It is possible to input a packet stream obtained from the outside via the digital interface 125 .

The video decoder 145S performs compression-encoded video information decoding processing, colorimetry conversion processing, dynamic range conversion processing, and the like on the decoded video information on the video data input from the demultiplexing unit 143S. In addition, processing such as resolution conversion (up/down conversion) based on the control of the main control unit 101 is performed, and UHD (horizontal 3840 pixels × vertical 2160 pixels), HD (horizontal 1920 pixels × vertical 1080 pixels) and SD ( The image data is output at a resolution such as 720 horizontal pixels×480 vertical pixels. Video data may be output at other resolutions. The audio decoder 146S performs processing such as decoding of compression-encoded audio information. It also performs down-mix processing and the like under the control of the main control unit 101, and outputs audio data with the number of channels such as 22.2 ch, 7.1 ch, 5.1 ch, and 2 ch. Note that a plurality of video decoders 145S and audio decoders 146S may be provided in order to simultaneously perform multiple decoding processes of video data and audio data.

The data decoder 144S performs a process of generating an EPG based on program information data, a process of generating a data broadcast screen based on BML data, a process of controlling a cooperative application based on a broadcast communication cooperative function, and the like. The data decoder 144S has a BML browser function for executing a BML document, and the data broadcast screen generation process is executed by the BML browser function. In addition, the data decoder 144S performs a process of decoding superimposed data to generate superimposed information, a process of decoding subtitle data to generate subtitle information, and the like.

The superimposing unit 147S, superimposing unit 148S, and superimposing unit 149S superimpose the video data output from the video decoder 145S and the EPG, data broadcast screen, etc. output from the data decoder 144S, respectively. The synthesizing unit 151S performs a process of synthesizing the audio data output from the audio decoder 146S and the audio data reproduced by the data decoder 144S. The selection unit 150</b>S selects the resolution of video data based on the control of the main control unit 101 . Note that the functions of the superimposing section 147S, the superimposing section 148S, the superimposing section 149S, and the selecting section 150S may be integrated with the video selecting section 191. FIG. The function of the synthesizer 151S may be integrated with the voice selector 194. FIG.

FIG. 2G is a block diagram showing an example of the detailed configuration of the second decoder unit 140U.

Under the control of the main control unit 101, the selection unit 141U selects the packet stream input from the second tuner/demodulator 130T, the packet stream input from the third tuner/demodulator 130L, and the input from the fourth tuner/demodulator 130B. One of the packet streams is selected and output. The packet stream input from the second tuner/demodulator 130T, the third tuner/demodulator 130L, and the fourth tuner/demodulator 130B is, for example, an MMT packet stream or a TLV containing the MMT packet stream. A packet stream in MPEG-2 TS format using HEVC (High Efficiency Video Coding) or the like as a video compression method may be used. The CA descrambler 142U performs descrambling processing of a predetermined scramble system encryption algorithm based on various control information related to conditional access superimposed on the packet stream.

The demultiplexing unit 143U is a stream decoder, and separates and extracts video data, audio data, superimposed text data, caption data, program information data, etc. based on various control information contained in the input packet stream. The separated and extracted video data is distributed to the video decoder 145U, the separated and extracted audio data is distributed to the audio decoder 146U, and the separated and extracted superimposed character data, caption data, program information data, etc. are distributed to the multimedia decoder 144U. . A packet stream (for example, MPEG-2 PS, MMT packet stream, etc.) obtained from a server device on the Internet 800 via the LAN communication unit 121 may be input to the demultiplexing unit 143U. Further, the demultiplexing unit 143U can output the packet streams input from the second tuner/demodulator 130T, the third tuner/demodulator 130L, and the fourth tuner/demodulator 130B to the outside via the digital interface 125. It is possible to input a packet stream obtained from the outside via the digital interface 125 .

The multimedia decoder 144U performs a process of generating an EPG based on program information data, a process of generating a multimedia screen based on multimedia data, a control process of cooperative applications based on the broadcast communication cooperative function, and the like. The multimedia decoder 144U has an HTML browser function for executing HTML documents, and multimedia screen generation processing is executed by the HTML browser function.

The video decoder 145U, the audio decoder 146U, the superimposing unit 147U, the superimposing unit 148U, the superimposing unit 149U, the synthesizing unit 151U, and the selecting unit 150U are the video decoder 145S, the audio decoder 146S, the superimposing unit 147S, the superimposing unit 148S, and the superimposing unit 149S, respectively. , the combining unit 151S, and the selecting unit 150S. These are the video decoder 145S, the audio decoder 146S, the superimposing unit 147S, the superimposing unit 148S, the superimposing unit 149S, the synthesizing unit 151S, and the selecting unit 150S in FIG. The video decoder 145U, the audio decoder 146U, the superimposing unit 147U, the superimposing unit 148U, the superimposing unit 149U, the synthesizing unit 151U, and the selecting unit 150U will be explained separately, so separate detailed explanations will be omitted.

[Software Configuration of Broadcast Receiver]
FIG. 2H is a software configuration diagram of the broadcast receiving apparatus 100, and shows an example of the software configuration in the storage (accumulation) section 110 (or ROM 103, hereinafter the same) and RAM 104. As shown in FIG. A storage (accumulation) unit 110 stores a basic operation program 1001, a reception function program 1002, a browser program 1003, a content management program 1004, and other operation programs 1009. FIG. The storage (accumulation) unit 110 also includes a content storage area 1011 for storing content data such as moving images, still images, and audio, authentication information used for communication and cooperation with external mobile terminal devices, server devices, and the like. and a various information storage area 1019 for storing other various information.

A basic operation program 1001 stored in a storage (accumulation) unit 110 is developed in a RAM 104, and a basic operation control unit 1101 is configured by the main control unit 101 executing the expanded basic operation program. The receiving function program 1002, the browser program 1003, and the content management program 1004 stored in the storage (accumulation) unit 110 are developed in the RAM 104, and the main control unit 101 executes the expanded operating programs. A reception function control unit 1102, a browser engine 1103, and a content management unit 1104 are configured by this. The RAM 104 also includes a temporary storage area 1200 that temporarily holds data created during execution of each operating program as needed.

In the following description, for the sake of simplicity, the main control unit 101 expands the basic operation program 1001 stored in the storage unit 110 into the RAM 104 and executes it to control each operation block. will be described assuming that the basic operation control unit 1101 controls each operation block. Similar descriptions are made for other operating programs.

The reception function control unit 1102 performs basic control of the broadcast reception function of the broadcast receiving apparatus 100, the broadcast communication cooperation function, and the like. In particular, the channel selection/demodulation unit 1102a performs channel selection processing and TMCC information in the first tuner/demodulation unit 130C, the second tuner/demodulation unit 130T, the third tuner/demodulation unit 130L, the fourth tuner/demodulation unit 130B, and the like. It mainly controls acquisition processing, demodulation processing, and the like. The stream reproduction control unit 1102b performs layer division processing, error correction decoding processing, energy It mainly controls despreading processing, stream reproduction processing, and the like. The AV decoding unit 1102c mainly controls demultiplexing processing (stream decoding processing), video data decoding processing, audio data decoding processing, etc. in the first decoder unit 140S, the second decoder unit 140H, and the like. The multimedia (MM) data reproduction unit 1102d performs BML data reproduction processing, superimposed text data decoding processing, caption data decoding processing, and communication cooperation application control processing in the first decoder unit 140S, and HTML data reproduction processing in the second decoder unit 140H. , multimedia screen generation processing, control processing of communication cooperation applications, etc. The EPG generation unit 1102e mainly controls EPG generation processing and display processing of the generated EPG in the first decoder unit 140S and the second decoder unit 140H. The presentation processing unit 1102f controls colorimetry conversion processing, dynamic range conversion processing, resolution conversion processing, audio down-mixing processing, etc. in the first decoder unit 140S and the second decoder unit 140H, and controls the video selection unit 191 and the audio selection unit 194. etc. are controlled.

The BML browser 1103a and HTML browser 1103b of the browser engine 1103 interpret BML documents and HTML documents during the above-described BML data reproduction processing and HTML data reproduction processing, and perform data broadcasting screen generation processing and multimedia screen generation processing. .

The content management unit 1104 manages the time schedule and execution control when recording reservations and viewing reservations of broadcast programs, and manages copyrights when outputting broadcast programs, recorded programs, etc. from the digital I/F 125, LAN communication unit 121, etc. Management and expiration date management of linked applications acquired based on the broadcasting and communication linking function.

Each of the operation programs may be stored in the storage (accumulation) unit 110 and/or the ROM 103 in advance at the time of product shipment. It may be obtained from a server device on the Internet 800 via the LAN communication unit 121 or the like after product shipment. Further, each operation program stored in a memory card, an optical disk, or the like may be acquired via the expansion interface section 124 or the like. It may be newly acquired or updated via broadcast waves.

[Broadcast station server configuration]
FIG. 3A is an example of the internal configuration of the broadcasting station server 400. As shown in FIG. The broadcasting station server 400 is composed of a main control section 401 , a system bus 402 , a RAM 404 , a storage section 410 , a LAN communication section 421 and a digital broadcasting signal transmission section 460 .

The main control section 401 is a microprocessor unit that controls the entire broadcasting station server 400 according to a predetermined operation program. A system bus 402 is a communication path for transmitting and receiving various data and commands between the main control unit 401 and each operation block in the broadcasting station server 400 . A RAM 404 serves as a work area when each operation program is executed.

The storage unit 410 stores a basic operation program 4001 , a content management/distribution program 4002 and a content transmission program 4003 , and further comprises a content data storage area 4011 and metadata storage area 4012 . A content data storage area 4011 stores content data of each broadcast program broadcast by a broadcasting station. The metadata storage area 4012 stores metadata such as the program title, program ID, program outline, performers, broadcast date and time of each broadcast program.

Basic operation program 4001 and content management/distribution program 4002 and content transmission program 4003 stored in storage unit 410 are developed in RAM 404, and main control unit 401 executes the expanded basic operation program and content management/distribution program. A basic operation control section 4101, a content management/distribution control section 4102, and a content transmission control section 4103 are configured by executing the distribution program and the content transmission program.

In the following description, for the sake of simplicity, the basic operation program 4001 stored in the storage unit 410 is loaded into the RAM 404 and executed by the main control unit 401 to control each operation block. It is assumed that the operation control unit 4101 controls each operation block. Similar descriptions are made for other operating programs.

The content management/distribution control unit 4102 manages the content data and metadata stored in the content data storage area 4011 and the metadata storage area 4012, and provides the content data and metadata to the service provider based on the contract. Provide control. Furthermore, the content management/distribution control unit 4102 performs authentication processing of the service provider server 500 as necessary when providing content data, metadata, and the like to the service provider.

Content transmission control unit 4103 includes content data of broadcast programs stored in content data storage area 4011, program titles and program IDs of broadcast programs stored in metadata storage area 4012, program content copy control information, and the like. Time schedule management and the like are performed when the stream is transmitted via the digital broadcast signal transmission unit 460 .

The LAN communication unit 421 is connected to the Internet 800 and communicates with the service provider server 500 on the Internet 800 and other communication devices. The LAN communication unit 421 includes an encoding circuit, a decoding circuit, and the like. The digital broadcast signal transmission unit 460 performs processing such as modulation on a stream composed of content data of each broadcast program stored in the content data storage area 4011, program information data, etc. Send out as broadcast waves.

[Configuration of service provider server]
FIG. 3B is an example of the internal configuration of the service provider server 500. As shown in FIG. The service provider server 500 is composed of a main control unit 501, a system bus 502, a RAM 504, a storage unit 510, and a LAN communication unit 521.

The main control unit 501 is a microprocessor unit that controls the entire service provider server 500 according to a predetermined operating program. A system bus 502 is a communication path for transmitting and receiving various data and commands between the main control unit 501 and each operation block in the service provider server 500 . A RAM 504 serves as a work area when each operation program is executed.

The storage unit 510 stores a basic operation program 5001 , a content management/distribution program 5002 and an application management/distribution program 5003 . The content data storage area 5011 and the metadata storage area 5012 store content data, metadata, etc. provided from the broadcasting station server 400, content produced by service providers, metadata related to the content, and the like. The application storage area 5013 stores applications (operating programs and/or various data, etc.) necessary for realizing each service of the broadcast-communication cooperation system to be distributed in response to requests from each television receiver.

Further, the basic operation program 5001, the content management/distribution program 5002, and the application management/distribution program 5003 stored in the storage unit 510 are expanded in the RAM 504, and furthermore, the main control unit 501 executes the expanded basic operation program and content. By executing the management/distribution program and the application management/distribution program, a basic operation control section 5101, a content management/distribution control section 5102, and an application management/distribution control section 5103 are configured.

In the following description, for the sake of simplicity, the main control unit 501 expands the basic operation program 5001 stored in the storage unit 510 into the RAM 504 and executes it to control each operation block. It is assumed that the operation control unit 5101 controls each operation block. Similar descriptions are made for other operating programs.

Content management/distribution control unit 5102 acquires content data, metadata, etc. from broadcasting station server 400, manages content data, metadata, etc. stored in content data storage area 5011 and metadata storage area 5012, and performs various functions. It controls distribution of the content data, metadata, etc. to the television receiver. Also, the application management/distribution control unit 5103 manages each application stored in the application storage area 5013 and controls distribution of each application in response to a request from each television receiver. Furthermore, the application management/distribution control unit 5103 performs authentication processing of the television receivers as necessary when distributing each application to each television receiver.

The LAN communication unit 521 is connected to the Internet 800 and communicates with the broadcasting station server 400 on the Internet 800 and other communication devices. It also communicates with the broadcast receiving device 100 and the mobile information terminal 700 via the router device 800R. The LAN communication unit 521 includes an encoding circuit, a decoding circuit, and the like.

[Broadcast waves of digital broadcasting]
Here, an example of digital broadcasting broadcast waves received by the broadcast receiving apparatus according to the embodiment of the present invention will be described.

Broadcast receiving apparatus 100 is capable of receiving terrestrial digital broadcasting services that share at least some specifications with the ISDB-T (Integrated Services Digital Broadcasting for Terrestrial Television Broadcasting) system. Specifically, the dual-polarization terrestrial digital broadcasting that can be received by the second tuner/demodulator 130T is advanced terrestrial digital broadcasting that shares some specifications with the ISDB-T system. Also, the hierarchical division multiplexing digital terrestrial broadcasting that can be received by the third tuner/demodulator 130L is an advanced digital terrestrial broadcasting that shares some specifications with the ISDB-T system. Current digital terrestrial broadcasting that can be received by the first tuner/demodulator 130C is digital terrestrial broadcasting of the ISDB-T system. Advanced BS digital broadcasting and advanced CS digital broadcasting that can be received by the fourth tuner/demodulator 130B are digital broadcasting different from the ISDB-T system.

Here, the dual polarization terrestrial digital broadcasting and the hierarchical division multiplexing terrestrial digital broadcasting according to the present embodiment use OFDM (Orthogonal Frequency Division Multiplexing), which is one of the multi-carrier systems, as the transmission system, as in the ISDB-T system. frequency division multiplexing). Since OFDM is a multi-carrier system, the symbol length is long, and it is effective to add a redundant portion in the time axis direction called a guard interval, and it is possible to reduce the effects of multipath within the guard interval. is. Therefore, it is possible to realize an SFN (Single Frequency Network) and effectively utilize frequencies.

In the dual-polarization terrestrial digital broadcasting and hierarchical division multiplexing terrestrial digital broadcasting according to the present embodiment, OFDM carriers are divided into groups called segments as in the ISDB-T system. One channel bandwidth of a broadcast service consists of 13 segments. The central portion of the band is the position of segment 0, and segment numbers (0 to 12) are assigned sequentially above and below this. Channel coding of the dual-polarization digital terrestrial broadcasting and the hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment is performed in units of OFDM segments. It is thus possible to define hierarchical transmissions, for example, within the bandwidth of one television channel, some OFDM segments may be allocated to fixed reception services and the rest to mobile reception services. can. In layered transmission, each layer is composed of one or more OFDM segments, and parameters such as carrier modulation scheme, inner code coding rate, time interleaving length, etc. can be set for each layer. Note that the number of hierarchies may be set arbitrarily, for example, up to three hierarchies may be set. FIG. 4B shows an example of hierarchical allocation of OFDM segments when the number of hierarchical layers is three or two. In the example of FIG. 4B (1), the number of layers is 3, the A layer is composed of 1 segment (segment 0), the B layer is composed of 7 segments (segments 1 to 7), and the C layer is composed of 5 segments (segments 1 to 7). It consists of segments 8-12). In the example of FIG. 4B (2), the number of layers is 3, the A layer is composed of 1 segment (segment 0), the B layer is composed of 5 segments (segments 1 to 5), and the C layer is composed of 7 segments (segments 1 to 5). It consists of segments 6-12). In the example of FIG. 4B(3), the number of hierarchies is two, the A hierarchy is composed of one segment (segment 0), and the B hierarchy is composed of 12 segments (segments 1 to 12). The number of OFDM segments in each layer, channel coding parameters, etc. are determined according to organization information, and are transmitted by TMCC signals, which are control information for assisting the operation of the receiver.

In addition, as an example of use of the segment hierarchy allocation of (1), (2), and (3) in FIG. 4B, the following example can be given, for example.

For example, the hierarchy allocation in FIG. 4B(1) can be used in the dual polarization terrestrial digital broadcasting according to the present embodiment, and the same segment hierarchy allocation can be used for both horizontal polarization and vertical polarization. Specifically, the above-described one segment of horizontally polarized waves as the A layer may be used to transmit the mobile receiving service of the current terrestrial digital broadcasting. (In addition, the current terrestrial digital broadcasting mobile reception service may transmit the same service in the above one segment of vertical polarization. In this case, this is also treated as layer A.) The 7 segments of the wave may be used to transmit a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels×1080 vertical pixels, which is the current digital terrestrial broadcasting. (In addition, the digital terrestrial broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels may transmit the same service in the above 7 segments of vertical polarization. In this case, this is also the B layer. In addition, as C layer, the above 5 segments of both horizontal and vertical polarization, 10 segments in total, are advanced terrestrial technology capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels × 1080 vertical pixels. It may be configured to transmit a digital broadcasting service. Details of the transmission will be described later. The transmission wave assigned to the segment hierarchy can be received by the second tuner/demodulator 130T of the broadcast receiving apparatus 100, for example.

For example, the hierarchical assignment of FIG. 4B(2) can be used as a different example from FIG. 4B(1) in the dual-polarization terrestrial digital broadcasting according to the present embodiment. Hierarchical allocation should be used. Specifically, the above-described one segment of horizontally polarized waves as the A layer may be used to transmit the mobile receiving service of the current terrestrial digital broadcasting. (The current terrestrial digital broadcasting mobile reception service may transmit the same service in the above one segment of vertical polarization. In this case, this is also treated as layer A.) Furthermore, horizontal polarization is used as layer B. It is configured to transmit an advanced terrestrial digital broadcasting service capable of transmitting video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels for a total of 10 segments, the above 5 segments for both waves and vertically polarized waves. can be Also, as the C layer, it is possible to transmit a terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels×1080 vertical pixels, which is the current terrestrial digital broadcasting, using the above 7 segments of horizontally polarized waves. (In addition, the digital terrestrial broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels may transmit the same service in the above 7 segments of vertical polarization. In this case, this is also the C layer. The details of this transmission will be described later. The transmission wave assigned to the segment hierarchy can be received by, for example, the second tuner/demodulator 130T of the broadcast receiving apparatus 100 of this embodiment.

For example, the hierarchical assignment of FIG. 4B(3) can be used in hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment and current digital terrestrial broadcasting. Specifically, when used in hierarchical division multiplexing digital terrestrial broadcasting, the mobile receiving service of the current digital terrestrial broadcasting may be transmitted in one segment in the figure as the A layer. Furthermore, as the B layer, it may be configured to transmit an advanced digital terrestrial broadcasting service capable of transmitting video with a maximum resolution exceeding 1920 horizontal pixels×1080 vertical pixels in 12 segments in the figure. The transmission wave assigned to the segment hierarchy can be received by, for example, the third tuner/demodulator 130L of the broadcast receiving apparatus 100 of this embodiment. When used in the current terrestrial digital broadcasting, it suffices to transmit the mobile reception service of the current terrestrial digital broadcasting in one segment in the figure as layer A, and in the 12 segments in the figure as layer B, the current digital terrestrial broadcasting. A terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels×1080 vertical pixels may be transmitted. The transmission wave assigned to the segment hierarchy can be received by, for example, the first tuner/demodulator 130C of the broadcast receiving apparatus 100 of this embodiment.

FIG. 4C shows an example of a system on the broadcasting station side that realizes processing for generating OFDM transmission waves, which are digital broadcast waves for dual-polarization digital terrestrial broadcasting and hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment. An information source encoding unit 411 encodes video/audio/various data and the like. The multiplexing unit/conditional access processing unit 415 multiplexes the video/audio/various data encoded by the information source encoding unit 411, performs processing corresponding to conditional access as appropriate, and outputs as a packet stream. do. A plurality of information source coding units 411 and multiplexing/conditional access processing units 415 can exist in parallel to generate a plurality of packet streams. The transmission path coding unit 416 remultiplexes the plurality of packet streams into one packet stream, performs transmission path coding processing, and outputs it as an OFDM transmission wave. Although the configuration shown in FIG. 4C differs in the details of the information source coding and channel coding schemes, the configuration for realizing OFDM transmission wave generation processing is common to the ISDB-T scheme. Therefore, of the plurality of information source encoding units 411 and multiplexing units/conditional access processing units 415, some are configured for ISDB-T digital terrestrial broadcasting services, and some are configured for advanced terrestrial digital broadcasting services. , and a plurality of packet streams of different digital terrestrial broadcasting services may be multiplexed by the transmission path coding unit 416. FIG. When the multiplexing unit/conditional access processing unit 415 is configured for the ISDB-T system digital terrestrial broadcasting service, MPEG-2TS, which is a TSP (Transport Stream Packet) stream defined by MPEG-2 Systems, is used. should be generated. Further, when the multiplexing unit/conditional access processing unit 415 is configured for advanced terrestrial digital broadcasting services, MMT packet streams, TLV streams containing MMT packets, and TSP streams defined by other systems are used. should be generated. Of course, all of the plurality of information source coding units 411 and multiplexing/conditional access processing units 415 are configured for advanced terrestrial digital broadcasting services, and all packet streams multiplexed by the transmission line coding unit 416 are advanced. A packet stream for a digital terrestrial broadcasting service may be used.

FIG. 4D shows an example of the configuration of the channel coding section 416. As shown in FIG.

First, FIG. 4D(1) will be described. FIG. 4D(1) shows the configuration of the channel coding unit 416 when generating only OFDM transmission waves for digital broadcasting of the current terrestrial digital broadcasting service. An OFDM transmission wave transmitted in this configuration has, for example, the segment configuration shown in FIG. 4B(3). The packet stream input from the multiplexing unit/conditional access processing unit 415 and subjected to re-multiplexing processing is added with error correction redundancy and subjected to various types of interleaving such as byte interleaving, bit interleaving, time interleaving, and frequency interleaving. Interleave processing is performed. After that, IFFT (Inverse Fast Fourier Transform) processing is performed along with the pilot signal, the TMCC signal, and the AC signal, and after a guard interval is added, the signal is subjected to orthogonal modulation to become an OFDM transmission wave. Outer code processing, power spreading processing, byte interleaving, inner code processing, and mapping processing are configured so that they can be processed separately for each layer such as the A layer and the B layer. (It should be noted that the digital broadcasting of the current terrestrial digital broadcasting service has two layers for operation, but since transmission is possible up to three layers, FIG. 4D (1) shows an example of three layers.) is modulation processing. The packet stream input from the multiplexer/conditional access processor 415 may be multiplexed with TMCC information, mode, guard interval ratio, and other information. Note that the packet stream input to the channel coding unit 416 may be a TSP stream defined by MPEG-2 Systems, as described above. The OFDM transmission wave generated by the configuration of FIG. 4D(1) can be received by, for example, the first tuner/demodulator 130C of the broadcast receiver 100 of this embodiment.

Next, FIG. 4D(2) will be described. FIG. 4D(2) shows the configuration of the transmission line encoder 416 when generating OFDM transmission waves for dual-polarization terrestrial digital broadcasting according to this embodiment. An OFDM transmission wave transmitted in this configuration has, for example, the segment configuration shown in FIG. 4B (1) or (2). In FIG. 4D(2) as well, the packet stream input from the multiplexing unit/conditional access processing unit 415 and subjected to re-multiplexing processing is added with error correction redundancy, byte interleaved, bit interleaved, and time interleaved. Various interleaving processes such as interleaving and frequency interleaving are performed. Thereafter, IFFT processing is performed along with the pilot signal, TMCC signal, and AC signal, and after guard interval addition processing, orthogonal modulation is performed to obtain an OFDM transmission wave.

In the configuration example of FIG. 4D(2), outer code processing, power spreading processing, byte interleaving, inner code processing, mapping processing, and time interleaving are performed separately for each layer such as layer A, layer B, and layer C. Configure as much as possible. However, in the configuration example of FIG. 4D (2), not only the OFDM transmission wave of horizontal polarization (H) but also the OFDM transmission wave of vertical polarization (V) is generated, and the processing flow branches into two systems. do. When branching from the horizontal polarization (H) processing system to the vertical polarization (V) processing system, the same data as the horizontal polarization (H) processing system is branched to the vertical polarization (V) processing system. 4B ( It can be made different for each layer corresponding to the segment configuration described in 1) or (2).

The processing of the outer code, inner code, mapping, etc. shown in the configuration of FIG. 4D(2) is the processing compatible with the configuration of FIG. More advanced processing that is not employed can be used. Specifically, in the configuration shown in FIG. 4D(2), for the portion where processing is performed for each layer, the current terrestrial digital broadcasting mobile reception service and video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels are used. In the layer where the current terrestrial digital broadcasting service is transmitted, processing compatible with the configuration of FIG. 4D(1) is performed for processing such as outer code, inner code, and mapping. On the other hand, in the configuration of FIG. 4D (2), for the part where processing is performed for each layer, advanced terrestrial digital broadcasting capable of transmitting video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels The hierarchy for transmitting services may be configured to use higher-level processing that is not adopted in each processing of the configuration of FIG. 4D(1) for processing such as outer code, inner code, and mapping.

In addition, in the dual polarization terrestrial digital broadcasting according to the present embodiment, it is possible to switch the hierarchy and the allocation of the terrestrial digital broadcasting service to be transmitted according to the TMCC information described later. It is desirable to configure so that processing such as outer code, inner code, and mapping to be applied can be switched by TMCC information.

In addition, byte interleave, bit interleave, and time interleave are the current terrestrial digital broadcast layer for transmission of advanced terrestrial digital broadcasting services capable of transmitting video with a maximum resolution exceeding 1920 pixels horizontally by 1080 pixels vertically. A process compatible with the service may be performed, or a more advanced different process may be performed. Alternatively, a part of the interleaving may be omitted for the layers that transmit advanced digital terrestrial broadcasting services.

In addition, in the configuration of FIG. 4D(2), the layer for transmitting the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service transmitting video with a maximum resolution of 1920 pixels horizontally by 1080 pixels vertically is transmitted. The input stream to be the source may be a TSP stream defined by MPEG-2 Systems, which is adopted in the current terrestrial digital broadcasting, among the packet streams input to the channel coding unit 416 . The input stream that is the source of the layer that transmits the advanced terrestrial digital broadcasting service with the configuration of FIG. For example, it may be a stream defined by a system other than the TSP stream defined by MPEG-2 Systems. However, a TSP stream defined by MPEG-2 Systems may be adopted for advanced terrestrial digital broadcasting services.

In the configuration of FIG. 4D(2) explained above, until the OFDM transmission wave is generated from the input stream, the mobile reception service of the current terrestrial digital broadcasting and the video with the maximum resolution of 1920 horizontal pixels × 1080 vertical pixels are transmitted. Stream formats and processes compatible with the current terrestrial digital broadcasting are maintained in the layer where the current terrestrial digital broadcasting service is transmitted. As a result, one of the horizontally polarized OFDM transmission waves and the vertically polarized OFDM transmission waves generated in the configuration of FIG. In this case, the current terrestrial digital broadcasting mobile reception service and the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels × 1080 vertical pixels are transmitted. It is possible to correctly receive and demodulate the signal.

In addition, in the configuration of FIG. 4D (2), in the hierarchy using both the segments of the horizontally polarized OFDM transmission wave and the vertically polarized OFDM transmission wave, the number of pixels exceeding horizontal 1920 pixels × vertical 1080 pixels is the maximum resolution. It is possible to transmit an advanced digital terrestrial broadcasting service capable of transmitting video such as . becomes.

That is, in the configuration of FIG. 4D(2), digital broadcasts can be suitably received and demodulated in both broadcast receivers compatible with advanced terrestrial digital broadcast services and existing receivers for current terrestrial digital broadcast services. Broadcast waves can be generated.

Next, FIG. 4D(3) will be described. FIG. 4D(3) shows the configuration of the channel coding unit 416 when generating OFDM transmission waves for hierarchical division multiplexing digital terrestrial broadcasting according to this embodiment. In FIG. 4D(3) as well, the packet stream input from the multiplexing unit/conditional access processing unit 415 and subjected to re-multiplexing processing is added with error correction redundancy, byte interleave, bit interleave, time Various interleaving processes such as interleaving and frequency interleaving are performed. After that, IFFT processing is performed along with the pilot signal, TMCC signal, and AC signal, and after adding a guard interval, the OFDM transmission wave is obtained through quadrature modulation.

However, in the configuration of FIG. 4D(3), a modulated wave transmitted in the upper layer and a modulated wave transmitted in the lower layer are respectively generated and multiplexed to generate an OFDM transmission wave, which is a digital broadcast wave. The processing system shown on the upper side of the configuration of FIG. 4D (3) is a processing system for generating modulated waves transmitted in the upper layer, and the processing system shown on the lower side generates modulated waves transmitted in the lower layer. It is a processing system for The data to be transmitted to the processing system for generating the modulated waves transmitted in the upper hierarchy of FIG. Current terrestrial digital broadcasting service for transmitting video, various processing in the processing system for generating modulated waves transmitted in the upper layer of FIG. 4D (3) are the same as or It is a compatible process. The modulated wave transmitted in the upper layer of FIG. 4D(3) has, for example, the segment configuration of FIG. 4B(3) like the transmission wave of FIG. 4D(1). Therefore, the modulated wave transmitted in the upper layer of FIG. 4D (3) is the current terrestrial digital broadcasting mobile reception service or the current terrestrial digital broadcasting service that transmits video with a maximum resolution of 1920 pixels horizontally × 1080 pixels vertically. It is a digital broadcast wave compatible with On the other hand, the data transmitted through the processing system for generating the modulated wave transmitted in the lower hierarchy of FIG. It is an advanced terrestrial digital broadcasting service that can be transmitted, and for example, for processing such as outer code, inner code, mapping, etc., it is configured to use more advanced processing that is not adopted in each processing of the configuration of FIG. 4D (1) do it.

The modulated wave transmitted in the lower layer of FIG. 4D (3) is, for example, an advanced terrestrial wave that can transmit video with a maximum resolution exceeding 1920 horizontal pixels × 1080 vertical pixels with all 13 segments as A layer. It may be assigned to a digital broadcasting service. Alternatively, with the segment configuration of FIG. 4B (3), the current terrestrial digital broadcasting mobile reception service is transmitted on the A layer of 1 segment, and the pixels exceeding 1920 horizontal pixels × 1080 vertical pixels on the B layer of 12 segments A high-level digital terrestrial broadcasting service capable of transmitting video with a maximum resolution of 1,000,000,000,000 may be transmitted. In the latter case, as in FIG. 4D(2), the processing may be switched for each layer such as layer A and layer B from outer code processing to time interleave processing. Similar to the description of FIG. 4D(2), it is necessary to maintain processing compatible with the current terrestrial digital broadcasting in the layer that transmits the current terrestrial digital broadcasting mobile reception service.

In the configuration of FIG. 4D(3), an OFDM transmission wave, which is a terrestrial digital broadcasting wave, is generated by multiplexing the modulated wave transmitted in the upper layer and the modulated wave transmitted in the lower layer. Since the technology for separating the modulated wave transmitted in the upper layer from the OFDM transmission wave is also installed in the existing receiver for the current terrestrial digital broadcasting service, the current The broadcast signal of the current digital terrestrial broadcasting service, which transmits video with a maximum resolution of 1920 pixels horizontally and 1080 pixels vertically, can be correctly received by the existing receiving equipment for the current digital terrestrial broadcasting service. Received and demodulated. On the other hand, broadcast signals of advanced digital terrestrial broadcasting services capable of transmitting video with a maximum resolution of more than 1920 horizontal pixels × 1080 vertical pixels included in the modulated waves transmitted in the lower layer are It is possible to receive and demodulate with the broadcast receiver 100 according to the embodiment of the invention.

That is, in the configuration of FIG. 4D(3), digital broadcasts can be suitably received and demodulated in both broadcast receivers compatible with advanced terrestrial digital broadcast services and existing receivers for current terrestrial digital broadcast services. Broadcast waves can be generated. Also, unlike the configuration of FIG. 4D(2), the configuration of FIG. 4D(3) does not require the use of a plurality of polarized waves, and can more easily generate a receivable OFDM transmission wave.

In the OFDM transmission wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of the present embodiment, adaptability to the inter-station distance of SFN and resistance to Doppler shift in mobile reception Considering the above, three types of modes with different numbers of carriers are prepared. Note that another mode with a different number of carriers may be further prepared. The effective symbol length is longer in a mode with a large number of carriers, and if the guard interval ratio (guard interval length/effective symbol length) is the same, the guard interval length will be longer, making it possible to provide resistance to multipath with a long delay time difference. is. On the other hand, in a mode with a small number of carriers, the carrier spacing is widened, and it is possible to reduce the influence of inter-carrier interference due to Doppler shift that occurs in the case of mobile reception or the like.

In the OFDM transmission wave generation processing according to FIG. 4D(1), FIG. 4D(2), and FIG. 4D(3) of the present embodiment, the carrier modulation method, inner Parameters such as coding rate of code and time interleaving length can be set. FIG. 4E shows an example of transmission parameters in units of one segment of OFDM segments identified by the mode of the system according to this embodiment. It should be noted that the carrier modulation method in the figure refers to the modulation method of the "data" carrier. The SP signal, CP signal, TMCC signal, and AC signal employ a modulation scheme different from that of the "data" carrier. Since these signals are signals whose resistance to noise is more important than the amount of information, a small-valued constellation (BPSK or A modulation scheme that maps to DBPSK (2-state) is employed to improve immunity to noise.

In addition, each numerical value of the number of carriers is the value when QPSK, 16QAM, 64QAM, etc. is set as the carrier modulation method on the left side of the hatched line, and the value when DQPSK is set as the carrier modulation method on the right side of the hatched line. value. In the figure, the underlined parameters are not compatible with the current terrestrial digital broadcasting mobile reception service. Specifically, 256QAM, 1024QAM, and 4096QAM, which are modulation methods for "data" carriers, are not adopted in current terrestrial digital broadcasting services. Therefore, in the processing in the hierarchy that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of the present embodiment, The 256QAM, 1024QAM and 4096QAM modulation schemes for the "data" carrier are not used. QPSK (4 states), 16QAM (16 states), 64QAM (state 64), 256QAM (256 states), 1024QAM (1024 states), or 4096QAM (4096 states) may be applied. Also, a modulation method different from these modulation methods may be adopted.

BPSK (number of states: 2), which is compatible with current terrestrial digital broadcasting services, may be used as the pilot symbol (SP or CP) carrier modulation method. DBPSK (number of states: 2), which is compatible with current terrestrial digital broadcasting services, may be used as the modulation method for AC carriers and TMCC carriers.

In addition, the LDPC code is not adopted as an inner code processing method in current terrestrial digital broadcasting services. Therefore, in the processing in the hierarchy that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of the present embodiment, No LDPC code is used. An LDPC code may be applied as an inner code to data transmitted in a layer corresponding to an advanced digital terrestrial broadcasting service. In addition, the BCH code is not adopted as an outer code processing method in current terrestrial digital broadcasting services. Therefore, in the processing in the hierarchy that requires compatibility with the current terrestrial digital broadcasting service in the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of the present embodiment, BCH codes are not used. A BCH code may be applied as an outer code to data transmitted in a layer corresponding to an advanced digital terrestrial broadcasting service.

4F shows transmission signal parameters for each physical channel (6 MHz bandwidth) of OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of this embodiment. Here is an example. In the OFDM broadcast wave generation processing according to FIGS. 4D(1), 4D(2), and 4D(3) of the present embodiment, basically, for compatibility with the current terrestrial digital broadcasting service, In principle, parameters compatible with the current terrestrial digital broadcasting service are adopted for the parameters in FIG. 4F. However, if all segments are assigned to advanced terrestrial digital broadcasting services in modulated waves transmitted in the lower hierarchy of FIG. do not have. Therefore, in this case, parameters other than the parameters shown in FIG. 4F may be used for modulated waves transmitted in the lower layer of FIG. 4D(3).

Next, the carrier of the OFDM transmission wave according to this embodiment will be explained. OFDM transmission wave carriers according to the present embodiment include carriers for transmitting data such as video and audio, carriers for transmitting pilot signals (SP, CP, AC1, AC2) that serve as demodulation references, There is a carrier through which a TMCC signal, which is information such as carrier modulation format and convolutional coding rate, is transmitted. These transmissions use a number of carriers corresponding to 1/9 of the number of carriers per segment. In addition, a concatenated code is adopted for error correction, and a shortened Reed-Solomon (204, 188) code is used as the outer code, and punctured with a constraint length of 7 and a coding rate of 1/2 as the mother code for the inner code. A convolutional code is employed. Encoding different from the above may be used for both the outer code and the inner code. The information rate varies depending on parameters such as carrier modulation format, convolutional coding rate and guard interval ratio.

Also, one frame is made up of 204 symbols, and an integer number of TSPs are included in one frame. Switching of transmission parameters is performed at the boundary of this frame.

Pilot signals that serve as demodulation references include SP (Scattered Pilot), CP (Continual Pilot), AC (Auxiliary Channel) 1, and AC2. FIG. 4G shows an example of an arrangement image of pilot signals, etc. within a segment in the case of synchronous modulation (QPSK, 16QAM, 64QAM, 256QAM, 1024QAM, 4096QAM, etc.). An SP is inserted into a synchronous modulation segment and transmitted once every 12 carriers in the carrier number (frequency axis) direction and once every 4 symbols in the OFDM symbol number (time axis) direction. Since the amplitude and phase of the SP are known, it can be used as a reference for synchronous demodulation. FIG. 4H shows an example of an arrangement image within a segment of pilot signals, etc. in the case of differential modulation (DQPSK, etc.). CP is a continuous signal inserted at the left end of the differential modulation segment and used for demodulation.

AC1 and AC2 are loaded with information on the CP and, in addition to their role as pilot signals, are also used to transmit information for broadcasters. It may be used for transmission of other information.

Note that the layout images shown in FIGS. 4G and 4H are respectively examples for mode 3, and the carrier numbers range from 0 to 431, but for modes 1 and 2, 0 to 107 or 0, respectively. to 215. In addition, carriers for transmitting AC1, AC2, and TMCC may be determined in advance for each segment. Note that carriers for transmitting AC1, AC2, and TMCC are randomly arranged in the frequency direction in order to reduce the influence of periodic dips in transmission path characteristics due to multipath.

[TMCC signal]
The TMCC signal transmits information (TMCC information) related to the demodulation operation of the receiver, such as the hierarchical structure and transmission parameters of the OFDM segment. A TMCC signal is transmitted using a carrier for TMCC transmission specified in each segment. FIG. 5A shows an example of bit allocation for TMCC carriers. A TMCC carrier consists of 204 bits (B0 to B203). B0 is the demodulation reference signal for the TMCC symbols and has a predetermined amplitude and phase reference. B1 to B16 are synchronizing signals, each consisting of a 16-bit word. Two types of synchronization signals, w0 and w1, are defined, and w0 and w1 are alternately transmitted for each frame. B17-B19 are used to identify the segment type, and identify whether each segment is a differential modulation section or a synchronous modulation section. TMCC information is described in B20 to B121. B122 to B203 are parity bits.

The TMCC information of the OFDM transmission wave according to the present embodiment includes, for example, system identification, transmission parameter switching index, activation control signal (emergency warning broadcast activation flag), current information, next information, frequency conversion process identification, It may be configured to include information for assisting demodulation and decoding operations of the receiver, such as physical channel number identification, main signal identification, 4K signal transmission layer identification, additional layer transmission identification, and the like. The current information indicates the current hierarchical structure and transmission parameters, and the next information indicates the hierarchical structure and transmission parameters after switching. Switching of transmission parameters is performed on a frame-by-frame basis. FIG. 5B shows an example of bit allocation of TMCC information. Also, FIG. 5C shows an example of the configuration of transmission parameter information included in current information/next information. The concatenated transmission phase correction amount is control information used in the case of ISDB for Terrestrial Sound Broadcasting (ISDB for Terrestrial Sound Broadcasting), etc., which share a common transmission method, and detailed description thereof is omitted here.

FIG. 5D shows an example of bit allocation for system identification. Two bits are assigned to the signal for system identification. In the case of the current terrestrial digital television broadcasting system, "00" is set. In the case of a terrestrial digital audio broadcasting system with a common transmission method, "01" is set. Also, in the case of an advanced digital terrestrial television broadcasting system such as dual polarization terrestrial digital broadcasting or hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment, "10" is set. In the advanced terrestrial digital television broadcasting system, 2K broadcast programs (horizontal 1920 pixels × vertical 1080 pixels video broadcast programs, and lower resolution video broadcasts are transmitted by broadcast wave transmission using a dual polarization transmission system or hierarchical division multiplexing system. It is possible to simultaneously transmit 4K broadcast programs (broadcast programs with images exceeding 1920 pixels horizontally by 1080 pixels vertically) within the same service.

The transmission parameter switching indicator is used to notify the receiver of switching timing by counting down when switching transmission parameters. This index normally has a value of "1111", and is subtracted by 1 for each frame from 15 frames before switching when the transmission parameter is switched. The switching timing is the next frame synchronization when "0000" is sent. The index value returns to "1111" after "0000". Any one or more of parameters such as system identification of the TMCC information shown in FIG. When switching between, countdown is performed. When switching only the activation control signal of the TMCC information, the countdown is not performed.

The activation control signal (emergency warning broadcast activation flag) is set to "1" when activation control is performed on the receiver in the emergency alert broadcast, and is set to "0" when activation control is not performed. do.

The partial reception flag for each current information/next information is set to "1" when the segment in the center of the transmission band is set to partial reception, otherwise set to "0". If segment 0 is configured for partial reception, that layer is defined as A layer. If there is no next information, the partial reception flag is set to "1".

FIG. 5E shows an example of bit allocation for carrier modulation mapping schemes (data carrier modulation schemes) in each hierarchical transmission parameter for each current information/next information. If this parameter is "000", it indicates that the modulation scheme is DQPSK. A value of "001" indicates that the modulation scheme is QPSK. If it is "010", it indicates that the modulation scheme is 16QAM. If it is "011", it indicates that the modulation scheme is 64QAM. A value of "100" indicates that the modulation scheme is 256QAM. "101" indicates that the modulation scheme is 1024QAM. If it is "110", it indicates that the modulation scheme is 4096QAM. If there is no unused hierarchy or next information, "111" is set for this parameter.

As for settings such as the coding rate and the length of time interleaving, each parameter may be set according to the organization information of each layer for each current information/next information. The number of segments indicates the number of segments in each hierarchy with a 4-bit numerical value. If there is no unused hierarchy or next information, "1111" is set. Since settings such as mode and guard interval ratio are independently detected on the receiver side, it is not necessary to transmit TMCC information.

FIG. 5F shows an example of bit allocation for frequency conversion process identification. The frequency conversion processing identification is performed by the conversion unit 201T and conversion unit 201L in FIG. In that case, set "0". If frequency conversion processing or frequency conversion amplification processing is not performed, "1" is set. For example, this parameter is set to "1" when transmitted from a broadcasting station, and when the conversion unit 201T or the conversion unit 201L performs frequency conversion processing or frequency conversion amplification processing, the conversion unit 201T or the conversion unit 201L may be configured to rewrite to "0". In this way, when the second tuner/demodulator 130T or the third tuner/demodulator 130L of the broadcast receiving apparatus 100 receives data, if the frequency conversion process identification bit is "0", the OFDM It is possible to identify that the transmission wave has been subjected to frequency conversion processing or the like after being sent out from the broadcasting station.

In the dual-polarization terrestrial digital broadcasting according to the present embodiment, setting and rewriting of the frequency conversion processing identification bit may be performed for each of a plurality of polarizations. For example, if both of a plurality of polarized waves are not frequency-converted by the converter 201T in FIG. 2A, the frequency conversion processing identification bits contained in both OFDM transmission waves should be left as "1". Further, if only one of a plurality of polarized waves is to be frequency-converted by the converter 201T, the frequency-conversion processing identification bit contained in the OFDM transmission wave of the frequency-converted polarized wave is set to "0" by the converter 201T. ] should be rewritten. Further, if both of a plurality of polarized waves are to be frequency-converted by the conversion unit 201T, the frequency conversion processing identification bits included in the OFDM transmission waves of both polarized waves subjected to the frequency conversion are set to "0" by the conversion unit 201T. You should rewrite it. In this way, broadcast receiving apparatus 100 can identify whether or not frequency conversion is performed for each polarized wave among a plurality of polarized waves.

Since the frequency conversion processing identification bit is not defined in the current digital terrestrial broadcasting, it will be ignored by digital terrestrial broadcasting receivers already used by users. However, the bit may be introduced into a new digital terrestrial broadcasting service that transmits video with a maximum resolution of 1920 horizontal pixels×1080 vertical pixels, which is an improvement of the current digital terrestrial broadcasting. In this case, the first tuner/demodulator 130C of the broadcast receiving apparatus 100 according to the embodiment of the present invention may also be configured as a first tuner/demodulator corresponding to the new terrestrial digital broadcasting service.

As a modification, on the premise that the OFDM transmission wave is subjected to frequency conversion processing and frequency conversion amplification processing in the conversion unit 201T and the conversion unit 201L in FIG. It may be set to "0" in advance. It should be noted that this parameter may be configured to be set to "1" when the broadcast wave to be received is not the advanced terrestrial digital broadcasting service.

FIG. 5G shows an example of bit allocation for physical channel number identification. The physical channel number identification consists of a 6-bit code and identifies the physical channel number (13 to 52ch) of the broadcast wave to be received. This parameter is set to "111111" when the received broadcast wave is not the advanced digital terrestrial broadcasting service. The physical channel number identification bit is not defined in the current terrestrial digital broadcasting, and in the current terrestrial digital broadcasting receiver, the physical channel number of the broadcast wave specified by the broadcasting station is obtained from the TMCC signal, AC signal, etc. couldn't. In the broadcast receiving apparatus 100 according to the embodiment of the present invention, by using the physical channel number identification bit of the received OFDM transmission wave, without demodulating the carrier other than the TMCC signal and the AC signal, the OFDM transmission wave is It is possible to grasp the physical channel number set by the broadcasting station. The 13ch to 52ch physical channels are assigned in advance to a frequency band of 470 to 710 MHz with a bandwidth of 6 MHz per channel. Therefore, the fact that the broadcast receiving apparatus 100 can grasp the physical channel number of the OFDM transmission wave based on the physical channel number identification bit means that the frequency band in which the OFDM transmission wave was transmitted in the air as a digital terrestrial broadcasting wave can be grasped. It means you can.

In the dual-polarization terrestrial digital broadcasting according to the present embodiment, in the process of generating OFDM transmission waves on the broadcasting station side, each of a plurality of pairs of polarized waves in the bandwidth that originally constitutes one physical channel is assigned a corresponding physical channel number. Identification bits may be arranged and the same physical number should be given. Here, depending on the installation environment of the broadcast receiving apparatus 100, the conversion unit 201T in FIG. 2A may convert only the frequency of one of the plurality of polarized waves. As a result, when the respective frequencies of the plurality of pairs of polarized waves when received by the broadcast receiving apparatus 100 are different from each other, it is possible to detect that the plurality of polarized waves with different frequencies were originally a pair. If it cannot be grasped by some method, it will be impossible for the broadcast receiver side to perform advanced demodulation of digital terrestrial broadcasting using both polarizations of dual-polarization digital terrestrial broadcasting. Even in such a case, if the above-described physical channel number identification bit is used, when transmission waves indicating the same value of the physical channel number identification bit exist in a plurality of different frequencies in the broadcast receiving apparatus 100, the broadcasting station originally It can be identified as a transmission wave that was transmitted as a pair of polarized waves forming one physical channel. This makes it possible to achieve advanced digital terrestrial broadcasting demodulation of dual-polarization digital terrestrial broadcasting by using a plurality of transmission waves indicating the same value.

FIG. 5H shows an example of bit allocation for primary signal identification. This example is an example in which the main signal identification bit is arranged in bit B117.

When the OFDM transmission wave to be transmitted is the transmission wave of dual polarization terrestrial digital broadcasting, this parameter is set to "1" in the TMCC information of the transmission wave transmitted by the main polarization. It is set to "0" in the TMCC information of the transmission wave transmitted by the secondary polarized wave. In addition, the transmission wave transmitted by the main polarization means the same polarization direction as the polarization direction used for the transmission of the current terrestrial digital broadcasting service, of the vertical polarization signal and the horizontal polarization signal. Refers to polarized signals. In other words, in areas where the current terrestrial digital broadcasting service employs horizontal polarization transmission, in the dual-polarization terrestrial digital broadcasting service, the horizontal polarization is the main polarization and the vertical polarization is the secondary polarization. become a wave. In addition, in areas where the current terrestrial digital broadcasting service uses vertical polarization transmission, the vertical polarization is the main polarization and the horizontal polarization is the secondary polarization in the dual-polarization terrestrial digital broadcasting service. becomes.

In the broadcast receiving apparatus 100 that receives the transmission wave of dual-polarization terrestrial digital broadcasting according to the embodiment of the present invention, by using the main signal identification bit, the received transmission wave is transmitted with the main polarization at the time of transmission. It is possible to identify whether the signal was transmitted by the secondary polarized wave or by the secondary polarized wave. For example, if the identification processing of the main polarized wave and the secondary polarized wave is used, the transmission wave transmitted with the main polarization is first scanned during the initial scan described later, and the transmission wave transmitted with the main polarization is After the end of the initial scan of the transmission wave, it is possible to carry out processing such as performing the initial scan of the transmission wave transmitted by the secondary polarized wave.

The details of the hierarchy and segments of the dual-polarization terrestrial digital broadcasting according to the present embodiment and the configuration example of the digital broadcasting service to be transmitted will be described later. When transmitting digital broadcasting services and transmitting advanced terrestrial digital services on a hierarchy containing segments included in both the primary and secondary polarizations, an initial scan of the transmitted wave previously transmitted in the primary polarization. , complete the initial scan of the current terrestrial digital broadcasting service, and then perform the initial scan of the transmission wave transmitted by the secondary polarized wave to perform the initial scan of the advanced digital terrestrial broadcasting service. Also good. In this way, the initial scan of the advanced digital terrestrial broadcasting service can be performed after the initial scan of the current digital terrestrial broadcasting service is completed, and the setting by the initial scan of the current digital terrestrial broadcasting service can be performed by the advanced digital terrestrial broadcasting service. It is suitable because it can be reflected in the setting by the initial scan of the broadcasting service.
Note that the definition of the meanings of "1" and "0" of the main signal identification bits may be the opposite of the above description.

Also, instead of the main signal identification bit, a polarization direction identification bit may be used as one parameter of the TMCC information. Specifically, the broadcasting station sets the polarization direction identification bit to "1" for transmission waves transmitted with horizontal polarization, and the polarization direction identification bit is set at the broadcasting station side for transmission waves transmitted with vertical polarization. It should be "0". In the broadcast receiving apparatus 100 that receives the transmission wave of dual-polarization terrestrial digital broadcasting according to the embodiment of the present invention, by using the polarization direction identification bit, it is possible to determine in which polarization direction the received transmission wave is transmitted. It is possible to identify whether it was transmitted by For example, if the polarization direction identification process is used, in the initial scan described later, the transmission wave transmitted with horizontal polarization is first scanned, and the transmission wave transmitted with horizontal polarization is initially scanned. After the end of , it becomes possible to carry out processing such as performing an initial scan of the transmission wave transmitted with vertical polarization. For the explanation of the effect of this processing, the “main polarization” in the portion related to the initial scan in the above description of the main signal identification bit is read as “horizontal polarization”, and the “secondary polarization” is read as “vertical polarization”. Since it suffices to read it again, the explanation will be omitted.

It should be noted that the definitions of the meanings of "1" and "0" in the polarization direction identification bits may be reversed to those described above.

Also, instead of the above-described main signal identification bit, the first signal second signal identification bit may be used as one parameter of the TMCC information. Specifically, one of the horizontal polarized wave and the vertical polarized wave is defined as the first polarized wave, and the broadcast signal of the transmission wave transmitted with the first polarized wave is defined as the first signal. The station side should set the first signal second signal identification bit to "1". Also, the other polarized wave is defined as the second polarized wave, the broadcast signal of the transmission wave transmitted in the second polarized wave is defined as the second signal, and the broadcasting station side sets the first signal second signal identification bit. It should be "0". In the broadcast receiving apparatus 100 that receives the transmission wave of dual-polarization terrestrial digital broadcasting according to the embodiment of the present invention, by using the first signal/second signal identification bit, the received transmission wave can be any type during transmission. It is possible to identify whether the signal was transmitted in the polarization direction. Note that the first signal second signal identification bit replaces the concepts of "primary polarization" and "secondary polarization" with "first polarization" and "second polarization" from the definition of the above-described main signal identification bit. The processing and effects in the broadcast receiving apparatus 100 are obtained by changing the "main polarization" of the portion related to the processing of the broadcast receiving apparatus 100 in the above description of the main signal identification bit to the "first polarization." Since it suffices to read "secondary polarized wave" as "second polarized wave" and "secondary polarized wave", the explanation will be omitted.

Note that the definitions of the meanings of "1" and "0" in the first signal second signal identification bit may be reversed to those described above.

Next, in the transmission wave of the hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment, upper and lower layer identification bits may be used as one parameter of the TMCC information instead of the above-described main signal identification bits. Specifically, the upper and lower layer identification bits are set to "1" in the TMCC information of the modulated waves transmitted in the upper layer, and the upper and lower layer identification bits are set in the TMCC information of the transmission waves transmitted in the lower layer. should be set to "0". Also, if the broadcast wave to be received is not the advanced terrestrial digital broadcasting service, this parameter should be set to "1".

In the hierarchical division multiplexing digital terrestrial broadcasting according to the present embodiment, here, in the OFDM transmission wave generation processing on the broadcasting station side, a plurality of modulations that were originally transmitted in the upper layer and the lower layer of one physical channel Depending on the installation environment of the broadcast receiving apparatus 100, frequency conversion and signal amplification may be performed in the conversion unit 201L of FIG. 2A for the lower layers of the wave. Broadcast receiving apparatus 100, when receiving a transmission wave of hierarchical division multiplexing digital terrestrial broadcasting, determines whether the modulated wave was originally transmitted in the upper hierarchy or not, based on the upper and lower hierarchy identification bits described above. It is possible to identify whether it was a modulated wave transmitted by For example, the identification process allows the initial scanning of the advanced digital terrestrial broadcasting service transmitted in the lower hierarchy to be performed after the initial scanning of the current digital terrestrial broadcasting service transmitted in the upper hierarchy is completed. It is possible to reflect the setting by the initial scanning of the digital broadcasting service to the setting by the initial scanning of the advanced terrestrial digital broadcasting service. Also, in the third tuner/demodulator 130L of the broadcast receiving apparatus 100, it can be used to switch the processing of the demodulator 133S and the demodulator 133L based on the identification result.

In the explanation of the dual-polarization transmission system in each embodiment below, unless otherwise specified, an example in which horizontal polarization is the main polarization and vertical polarization is the secondary polarization will be explained. However, the relationship between main and sub may be reversed for horizontal polarization and vertical polarization.
FIG. 5I shows an example of bit allocation for 4K signaling layer identification.

When the broadcast wave to be transmitted is the transmission wave of the dual-polarization terrestrial digital broadcasting service according to the present embodiment, the bit of the 4K signal transmission layer identification is a horizontally polarized signal and a vertically polarized wave for each of the B layer and the C layer. It suffices to indicate whether or not to transmit a 4K broadcast program using both signals. One bit is assigned to each of the setting of the B layer and the setting of the C layer. For example, in the B layer and the C layer, if the 4K signal transmission layer identification bit for each layer is "0", both the horizontal polarization signal and the vertical polarization signal are used in the layer to use the 4K broadcast program. transmission is performed. In the B layer and the C layer, when the 4K signal transmission layer identification bit for each layer is "1", the 4K broadcast program that uses both the horizontal polarization signal and the vertical polarization signal is transmitted in that layer. It should be shown that it is not. In this way, in the broadcast receiving apparatus 100, using the 4K signal transmission layer identification bit, in the B layer and the C layer, both the horizontal polarization signal and the vertical polarization signal are used in each layer to perform 4K transmission. It is possible to identify whether or not to transmit the broadcast program.

Further, when the broadcast wave to be transmitted is the broadcast wave of the hierarchical division multiplexing terrestrial digital broadcasting service of the present embodiment, the 4K signal transmission layer identification bit indicates whether or not the 4K broadcast program is transmitted in the lower layer. should be used to indicate When B119 of this parameter is "0", 4K broadcast programs are transmitted in the lower layer. When B119 of this parameter is "1", 4K broadcast programs are not transmitted in the lower layer. In this way, in the broadcast receiving apparatus 100, it is possible to identify whether or not the 4K broadcast program is to be transmitted in the lower layer using the 4K signal transmission layer identification bit.

Note that when this parameter is "0", it is possible to employ an NUC (Non-Uniform Constellation) modulation scheme in addition to the basic modulation scheme shown in FIG. 5C as the carrier modulation mapping scheme. In this case, it is possible to transmit the current/next information of the transmission parameter additional information on layer B/layer C using AC1 or the like.

Also, if the broadcast waves to be transmitted are not for the advanced digital terrestrial broadcasting service, each of these parameters may be set to "1".

It should be noted that the definitions of the bits "0" and "1" for identifying the 4K signal transmission layer described above may be reversed from those described above.

FIG. 5J shows an example of bit allocation for additional layer transmission identification. The bit of the additional layer transmission identification is virtual for each of the B layer and C layer of the transmission wave transmitted by the dual polarized terrestrial digital broadcasting service of this embodiment and transmitted by the secondary polarized wave. It suffices to indicate whether or not it is used as the D layer or the virtual E layer.

For example, in the example shown in the figure, the bit placed in B120 is the D-layer transmission identification bit, and if this parameter is "0", the B-layer transmitted in the secondary polarized wave is used as the virtual D-layer. To be more precise, among the segments transmitted with the secondary polarization, the segment group having the same segment number as the segment belonging to the B layer transmitted with the primary polarization is transmitted with the primary polarization. This means that the layer is treated as a layer D, which is different from the layer B. When this parameter is "1", the B layer transmitted by the secondary polarization is not used as the virtual D layer, but is used as the B layer.

Also, for example, the bit arranged in B121 is the E-layer transmission identification bit, and when this parameter is "0", the C-layer transmitted in the secondary polarized wave is used as the virtual E-layer. To be more precise, among the segments transmitted with the secondary polarization, the segment group having the same segment number as the segment belonging to the C hierarchy transmitted with the primary polarization is transmitted with the primary polarization. In other words, it is handled as an E hierarchy, which is a hierarchy different from the C hierarchy. When this parameter is "1", the C layer transmitted by the secondary polarization is not used as the virtual E layer, but is used as the C layer.

In this way, in broadcast receiving apparatus 100, using the additional layer transmission identification bit (D layer transmission identification bit and/or E layer transmission identification bit), D layer and E layer transmitted with sub-polarization The presence or absence of can be identified. That is, in the terrestrial digital broadcasting according to the present embodiment, by using the additional layer transmission identification parameter shown in FIG. A number of new tiers (D and E tiers in the example of FIG. 5J) can be operated.

If this parameter is "0", parameters such as the carrier modulation mapping method, coding rate, and time interleaving length shown in FIG. It is possible to make them different. In this case, if the current/next information of parameters such as the carrier modulation mapping method, convolutional coding rate, and time interleaving length for the virtual D layer/virtual E layer is transmitted using AC information (for example, AC1), etc., On the broadcast receiving apparatus 100 side, parameters such as the carrier modulation mapping method, the convolutional coding rate, the length of time interleaving, etc. regarding the virtual D layer/virtual E layer can be grasped.

As a modification, when the additional layer transmission identification bit (the D layer transmission identification bit and/or the E layer transmission identification bit) is "0", the current information/next information of the TMCC information transmitted by the secondary polarization It may be configured to switch the meaning of transmission parameters of the B-layer and/or C-layer of information to the meaning of the virtual D-layer and/or virtual E-layer transmission parameters. In this case, when the virtual D layer and/or the virtual E layer is used, the primary polarization uses the A layer, the B layer, and the C layer, and the transmission parameters of these layers are the TMCC transmitted in the primary polarization. Information may be transmitted as current information/next information. Also, sub-polarized waves use layers A, D, and E, and the transmission parameters of these layers may be transmitted as current information/next information of TMCC information transmitted by sub-polarized waves. Even in this case, broadcast receiving apparatus 100 can grasp parameters such as the carrier modulation mapping method, convolutional coding rate, and length of time interleaving for the virtual D layer/virtual E layer.

In addition, when the broadcast wave to be transmitted is not the advanced terrestrial digital broadcasting service, or when the advanced terrestrial digital broadcasting service is of the hierarchical division multiplexing transmission system, this parameter is configured to be set to "1" respectively. Also good.

The additional layer transmission identification parameter may be stored in both the TMCC information of the main polarization and the TMCC information of the sub-polarization. can be realized.

Also, the definitions of bits "0" and "1" for identifying additional layer transmission described above may be reversed.

In addition, when the above-mentioned 4K signal transmission layer identification parameter indicates that a 4K broadcast program is transmitted on the B layer, the D layer transmission identification bit indicates that the B layer is used as a virtual D layer. However, the broadcast receiving apparatus 100 may ignore the D layer transmission identification bit. Similarly, if the 4K signal transmission layer identification parameter indicates that a 4K broadcast program is to be transmitted on the C layer, even if the E layer transmission identification bit indicates that the C layer is used as the virtual E layer, The broadcast receiving apparatus 100 may be configured to ignore the E layer transmission identification bit. If the order of priority of bits used for determination processing is clarified in this way, it is possible to prevent conflicts in determination processing in broadcast receiving apparatus 100 .

In the broadcast wave to be transmitted, the above-mentioned frequency conversion processing identification bit, physical channel number identification bit, main signal identification bit, 4K signal transmission identification bit, additional layer transmission identification bit, etc. are the above-mentioned system identification parameter is not "10", all bits should be set to "1" in principle. Although the system identification parameter is not "10", exceptionally due to some problem, the frequency conversion process identification bit, physical channel number identification bit, main signal identification bit, 4K signal transmission identification bit, additional layer transmission identification bit Even if the bit is not "1", the broadcast receiving apparatus 100 may be configured to ignore the bit that is not "1" and determine that all these bits are "1". .

FIG. 5K shows an example of the bit allocation for the “coding rate” bits, ie the code rate identification for error correction, shown in FIG. 5C.

Here, in the current digital terrestrial broadcasting system of 2K broadcasting, an identification bit that transmits a coding rate dedicated to "convolutional code" is transmitted. However, in the digital broadcasting according to the present embodiment, the 4K advanced terrestrial digital broadcasting service can be mixed with the 2K terrestrial digital broadcasting service. As already explained, in the advanced digital terrestrial broadcasting service of the 4K broadcasting, the LDPC code can be used as the inner code.

Therefore, unlike the current digital terrestrial broadcasting system of 2K broadcasting, the coding rate identification bit for error correction according to the present embodiment shown in FIG. It is also configured to support

Here, regardless of whether the inner code of the target terrestrial digital broadcasting service is a convolutional code or an LDPC code, the bits arranged in the common range are used as the identification bits for coding rate transmission, Achieve bit savings. Furthermore, even with the same identification bit, the coding rate setting can be set independently for the case where the inner code of the target terrestrial digital broadcasting service is a convolutional code and for the case where it is an LDPC code. As a result, it is possible to adopt a group of options of coding rates suitable for each coding method as a digital broadcasting system.

Specifically, in the example of FIG. 5K, when the identification bit is "000", the coding rate is 1/2 if the inner code is the convolutional code, and the coding rate is 2 if the inner code is the LDPC code. /3. When the identification bit is "001", it indicates that the coding rate is 2/3 if the inner code is a convolutional code, and that the coding rate is 3/4 if the inner code is an LDPC code. When the identification bit is "010", it indicates that the coding rate is 3/4 if the inner code is the convolutional code, and that the coding rate is 5/6 if the inner code is the LDPC code. When the identification bit is "011", it indicates that the coding rate is 5/6 if the inner code is the convolutional code, and that the coding rate is 2/16 if the inner code is the LDPC code. When the identification bit is "100", it indicates that the coding rate is 7/8 if the inner code is the convolutional code, and that the coding rate is 6/16 if the inner code is the LDPC code. If the identification bit is "101", it indicates that the inner code is undefined if the inner code is a convolutional code, and that the coding rate is 10/16 if the inner code is the LDPC code. If the identification bit is "110", it indicates that the inner code is undefined if the inner code is a convolutional code, and that the coding rate is 14/16 if the inner code is the LDPC code. If there is no unused hierarchy or next information, "111" is set for this parameter.

The identification of whether the inner code of the target terrestrial digital broadcasting service is the convolutional code or the LDPC code is based on whether the relevant terrestrial digital broadcasting service is the current terrestrial digital broadcasting service or the advanced terrestrial digital broadcasting service. You may discriminate using the result which discriminate|determines whether. The identification may be performed using the identification bit described in FIG. 5D or FIG. 5I. Here, if the target terrestrial digital broadcasting service is the current terrestrial digital broadcasting service, it is sufficient to identify that the inner code is the convolutional code. Further, when the target terrestrial digital broadcasting service is an advanced terrestrial digital broadcasting service, it is sufficient to identify that the inner code is the LDPC code.

Another example of identifying whether the inner code of the target terrestrial digital broadcasting service is a convolutional code or an LDPC code is identification based on the identification bit of the error correction method, which will be described later in FIG. 6I. can be

According to the error correction coding rate identification bit shown in FIG. 5K described above, it is possible to prevent an increase in the number of identification bits while supporting a plurality of inner code systems, which is preferable.

Further, in the advanced terrestrial digital broadcasting service of the dual-polarization transmission system, the TMCC information of the transmission wave transmitted with horizontal polarization and the TMCC information of the transmission wave transmitted with vertical polarization may be the same. and may be different. Similarly, in the advanced terrestrial digital broadcasting service of the hierarchical division multiplexing transmission system, the TMCC information of the transmission waves transmitted in the upper hierarchy and the TMCC information of the transmission waves transmitted in the lower hierarchy may be the same. and may be different. In addition, the above-mentioned frequency conversion processing identification parameter, main signal identification parameter, additional layer transmission identification, etc. are described only in the TMCC information of the transmission wave transmitted in the secondary polarization and the transmission wave transmitted in the lower layer. May be.

In the above description, the parameter for frequency conversion process identification, the parameter for main signal identification, the parameter for polarization direction identification, the parameter for first signal second signal identification, the parameter for upper/lower layer identification, and the parameter for 4K signal transmission layer identification. , the additional layer transmission identification parameter is included in the TMCC signal (TMCC carrier) and transmitted. However, these parameters may be included in an AC signal (AC carrier) and transmitted. That is, these parameters may be transmitted by a signal of a carrier (TMCC carrier, AC carrier, etc.) modulated by a modulation scheme that performs mapping with a smaller number of states than the data carrier modulation scheme.

[AC signal]
The AC signal is an additional information signal related to broadcasting, such as additional information related to transmission control of modulated waves or seismic motion warning information. The seismic motion warning information is transmitted using the segment 0 AC carrier. On the other hand, additional information related to transmission control of modulated waves can be transmitted using any AC carrier. FIG. 6A shows an example of bit allocation for AC signals. The AC signal consists of 204 bits (B0-B203). B0 is the demodulation reference signal for AC symbols and has a predetermined amplitude and phase reference. B1 to B3 are signals for identifying the configuration of the AC signal. B4 to B203 are used for transmission of additional information related to transmission control of modulated waves or for transmission of seismic motion warning information.

FIG. 6B shows an example of bit allocation for identification of the structure of the AC signal. When transmitting seismic motion warning information using AC signals B4 to B203, this parameter is set to "001" or "110". The configuration identification parameter (“001” or “110”) when transmitting seismic motion warning information has the same code as the leading 3 bits (B1 to B3) of the synchronization signal of the TMCC signal, and at the same timing as the TMCC signal. It is transmitted alternately every frame. Also, if this parameter has a value other than the above, it indicates that additional information relating to transmission control of the modulated wave is transmitted using B4 to B203 of the AC signal. Additional information relating to transmission control of modulated waves may be transmitted using B4 to B203 of the AC signal. In this case, as the parameter for identifying the configuration of the AC signal, "000" and "111", or "010" and "101", or "011" and "100" are alternately transmitted every frame.

B4 to B203 of the AC signal are used for transmission of additional information related to transmission control of modulated waves or transmission of seismic motion warning information.

Transmission of additional information related to transmission control of modulated waves may be performed using various bit configurations. For example, the frequency conversion process identification, physical channel number identification, main signal identification, 4K signal transmission layer identification, additional layer transmission identification, etc. described in the description of the TMCC signal can be changed to the TMCC signal or added to the TMCC signal. Bits may be assigned to additional information relating to transmission control of the modulated wave of the signal for transmission. In this way, in the broadcast receiving apparatus 100, using these parameters, various identification processes already explained in the explanation of the TMCC signal can be performed. In addition, transmission parameter additional information on the transmission layer of the 4K broadcast program when any parameter of the 4K signal transmission layer identification is "0", and virtual D when any parameter of the additional layer transmission identification is "0" Current/next information of the transmission parameters for the hierarchy/virtual E-tier may be assigned. In this way, the broadcast receiving apparatus 100 can acquire transmission parameters for each layer using these parameters, and can control demodulation processing for each layer.

The transmission of seismic motion warning information may be performed according to the bit allocation shown in FIG. 6C. The seismic motion warning information consists of a synchronization signal, start/end flag, update flag, signal identification, seismic motion warning detailed information, CRC, parity bit, and the like. The sync signal is composed of a 13-bit code, which is the same code as the 13 bits (B4 to B16) of the sync signal of the TMCC signal except for the first three bits. When the configuration identification of the AC signal indicates that seismic motion warning information is to be transmitted, the 16-bit code combining the configuration identification and the synchronization signal becomes the same 16-bit synchronization word as the TMCC synchronization signal. The start/end flag is composed of a 2-bit code as a flag for the start timing/end timing of the seismic motion warning information. The start/end flag is changed from "11" to "00" at the start of transmission of seismic motion warning information, and is changed from "00" to "11" at the end of transmission of seismic motion warning information. The update flag is composed of a 2-bit code, and each time a change occurs in the contents of a series of seismic motion warning detailed information transmitted when the start/end flag is "00", "00" is set as the initial value to "1". ] is incremented. After "11", it returns to "00". When the start/end flag is "11", the update flag is also "11".

An example of signal identification bit allocation is shown in FIG. 6D. The signal identification consists of a 3-bit code and is used to identify the type of seismic motion warning detailed information. If this parameter is "000", it means "earthquake motion warning detailed information (with corresponding area)". If this parameter is "001", it means "earthquake motion warning detailed information (no corresponding area)". If this parameter is '010', it means 'a test signal of detailed earthquake motion warning information (with corresponding area)'. If this parameter is '011', it means 'test signal of detailed earthquake motion warning information (no corresponding area)'. If this parameter is "111", it means "no detailed seismic motion warning information". When the start/end flag is "00", the signal identification is "000" or "001" or "010" or "011". When the start/end flag is "11", the signal identification is "111".

The seismic motion warning detailed information is composed of 88-bit code. When the signal identification is ``000'', ``001'', ``010'', or ``011'', the seismic motion warning detailed information includes information about the current time when the seismic motion warning information is sent, information indicating the area subject to the seismic motion warning, and Transmit information such as the latitude/longitude/seismic intensity of the epicenter of the earthquake to be alerted. FIG. 6E shows an example of bit allocation of seismic motion warning detailed information when the signal identification is "000", "001", "010", or "011". Also, when the signal identification is "111", it is possible to transmit a code or the like for identifying the broadcaster using the bits of the seismic motion warning detailed information. FIG. 6F shows an example of bit allocation of seismic motion warning detailed information when the signal identification is "111".

CRC is a code generated using a predetermined generator polynomial for B21 to B111 of the seismic motion warning information. A parity bit is a code generated by a shortened code (187, 105) of the difference set cyclic code (273, 191) for B17 to B121 of the seismic motion warning information.

Broadcast receiving apparatus 100 can perform various types of control for coping with emergencies using parameters related to seismic motion warnings described with reference to FIGS. 6C, 6D, 6E, and 6F. For example, it is possible to control the presentation of information related to seismic motion warnings, control to switch low-priority display content to displays related to seismic motion warnings, and control to end the display of applications and switch to displays related to seismic motion warnings and broadcast program images. be.

FIG. 6G shows an example of bit allocation of additional information regarding transmission control of modulated waves. Additional information relating to transmission control of modulated waves is composed of synchronization signals, current information, next information, parity bits, and the like. The sync signal is composed of a 13-bit code, which is the same code as the 13 bits (B4 to B16) of the sync signal of the TMCC signal except for the first three bits. When the configuration identification of the AC signal indicates that additional information regarding the transmission control of the modulated wave is transmitted, the 16-bit code combining the configuration identification and the synchronization signal is a 16-bit synchronization word conforming to the TMCC synchronization signal. becomes. The current information indicates current information of transmission parameter additional information when transmitting a 4K broadcast program on the B layer or C layer, or transmission parameters related to the virtual D layer or the virtual E layer. The next information indicates transmission parameter additional information when transmitting a 4K broadcast program on the B layer or the C layer, and information after switching transmission parameters regarding the virtual D layer or the virtual E layer.

In the example of FIG. 6G, current information B18 to B30 is the current information of the B layer transmission parameter additional information, and indicates the current information of the transmission parameter additional information when transmitting a 4K broadcast program on the B layer. be. Further, current information B31 to B43 is the current information of the C layer transmission parameter additional information, and indicates the current information of the transmission parameter additional information when transmitting the 4K broadcast program on the C layer. In addition, B70 to B82 of the next information are information after switching the transmission parameters of the B layer transmission parameter additional information, and after switching the transmission parameters of the transmission parameter additional information when transmitting the 4K broadcast program in the B layer. It is informational. Further, B83 to B95 of the next information are information after switching the transmission parameters of the C layer transmission parameter additional information, and information after switching the transmission parameters of the transmission parameter additional information when transmitting the 4K broadcast program in the C layer. is shown. Here, the transmission parameter additional information is transmission parameters related to modulation that are added to the transmission parameters of the TMCC information shown in FIG. 5C to extend the specifications. Specific contents of the transmission parameter additional information will be described later.

In the example of FIG. 6G, current information B44 to B56 is the current information of the transmission parameters for the virtual D layer when operating the virtual D layer. B57 to B69 of the current information are current information of transmission parameters for the virtual E layer when operating the virtual E layer. Further, B96 to B108 of the next information are information after switching the transmission parameters for the virtual D layer when the virtual D layer is operated. B109 to B121 of the current information are information after switching the transmission parameters for the virtual E layer when operating the virtual E layer. The parameters stored in the transmission parameters for the virtual D layer and the transmission parameters for the virtual E layer may be the same as those shown in FIG. 5C.

The virtual D layer and the virtual E layer are layers that do not exist in current terrestrial digital broadcasting. It is not easy to increase the number of bits for the TMCC information in FIG. 5B because it is necessary to maintain compatibility with current terrestrial digital broadcasting. Therefore, in the embodiment of the present invention, the transmission parameters for the virtual D layer and the virtual E layer are stored in the AC information as shown in FIG. 6G instead of the TMCC information.

This makes it possible to transmit information on modulation for the new virtual D layer and virtual E layer to the receiving device while maintaining the compatibility of the TMCC information with the current terrestrial digital broadcasting. As a result, when using the broadcast waves of the dual-polarization terrestrial digital broadcasting service according to the present embodiment, the B layer/C layer of the transmission wave transmitted in the secondary polarized wave as the virtual D layer/virtual E layer In addition, it is possible to set the transmission parameters of the virtual D layer/virtual E layer of the transmission wave transmitted with the secondary polarization to be different from the transmission parameters of the B layer/C layer of the transmission wave transmitted with the primary polarization. It becomes possible.

In addition, when the virtual D layer or the virtual E layer is not used, there is no problem in ignoring the transmission parameter information for the unused layer in the broadcast receiving apparatus 100 . For example, for the virtual D layer or the virtual E layer, if the parameter of the additional layer transmission identification of the TMCC information in FIG. 100 may be configured to ignore any values in the transmission parameters shown in FIG. 6G for the unused virtual D-tier or virtual E-tier.

Next, the details of the transmission parameter additional information explained in FIG. 6G will be explained.

FIG. 6H shows a specific example of transmission parameter additional information. The transmission parameter additional information can include error correction method parameters, constellation format parameters, and the like.

The error correction method is the setting of what kind of coding method to use as the error correction method for the inner code and outer code when transmitting 4K broadcast programs (advanced terrestrial digital broadcasting services) on the B layer or C layer. indicates FIG. 6I shows an example of bit allocation for an error correction scheme. When this parameter is "000", when transmitting a 4K broadcast program on the B layer or C layer, a convolutional code is used as the inner code and a shortened RS code is used as the outer code. When this parameter is "001", LDPC codes are used as inner codes and BCH codes are used as outer codes when transmitting 4K broadcast programs in the B and C layers. Furthermore, other combinations may be set so that they can be selected.

In addition, when transmitting 4K broadcast programs in the B layer and the C layer, it is possible to adopt not only uniform constellation but also non-uniform constellation (NUC) as a carrier modulation mapping method. FIG. 6J shows an example of bit allocation in constellation format. When this parameter is '000', the carrier modulation mapping method selected by the transmission parameter of TMCC information is applied with a uniform constellation. If this parameter is any of '001' to '111', the carrier modulation mapping method selected in the transmission parameter of TMCC information is applied with a non-uniform constellation. When a non-uniform constellation is applied, the optimal value of the non-uniform constellation differs depending on the type of error correction method, its coding rate, and the like. Therefore, when the parameter of the constellation format is any one of "001" to "111", the broadcast receiving apparatus 100 of the present embodiment uses the non-uniform constellation used in the demodulation process as the parameter of the carrier modulation mapping method. , and the parameter of the error correction method and the parameter of the coding rate. The determination may be made by referring to a predetermined table stored in the broadcast receiving apparatus 100 in advance.

[Transmission method 1 for advanced terrestrial digital broadcasting service]
In order to realize 4K (horizontal 3840 pixels × vertical 2160 pixels) broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service, as an example of the transmission method of the advanced terrestrial digital broadcasting service according to the embodiment of the present invention, polarization A dual-use transmission system will be described. The dual-polarization transmission system according to the embodiment of the present invention is a system that has some specifications in common with the current terrestrial digital broadcasting system. For example, 13 segments within the approximately 6 MHz band corresponding to one physical channel are divided, 7 segments for transmission of 2K (horizontal 1920 pixels × vertical 1080 pixels) broadcast programs, and 5 segments for transmission of 4K broadcast programs. , one segment is allocated for mobile reception (so-called one-segment broadcasting). Furthermore, the 5 segments for 4K broadcasting use not only horizontal polarization signals but also vertical polarization signals to ensure transmission capacity for a total of 10 segments by MIMO (Multiple-Input Multiple-Output) technology. In addition, 2K broadcast programs maintain image quality by optimizing the latest MPEG-2 Video compression technology so that they can be received even with current TV receivers, and HEVC compression, which is more efficient than MPEG-2 Video, is used for 4K broadcast programs. Image quality is ensured by optimizing technology and multilevel modulation. Note that the number of allocated segments for each broadcast may differ from that described above.

FIG. 7A shows an example of a dual-polarization transmission scheme in an advanced terrestrial digital broadcasting service according to an embodiment of the present invention. A frequency band of 470 to 710 MHz is used for transmission of broadcast waves for terrestrial digital broadcasting services. The number of physical channels in the frequency band is 40 channels from 13 to 52 ch, and each physical channel has a bandwidth of 6 MHz. A dual-polarization transmission scheme according to an embodiment of the present invention uses both horizontally polarized signals and vertically polarized signals within one physical channel.

FIG. 7A shows two examples (1) and (2) of allocation examples of 13 segments. In example (1), 2K broadcast programs are transmitted using segments 1 to 7 (B layer) of the horizontally polarized signal. 4K broadcast programs are transmitted using a total of 10 segments, segments 8 to 12 (C layer) of the horizontal polarization signal and segments 8 to 12 (C layer) of the vertical polarization signal. Segments 1 to 7 (B layer) of the vertically polarized signal may be used to transmit the same broadcast program as the 2K broadcast program transmitted by segments 1 to 7 (B layer) of the horizontally polarized signal. Alternatively, it may be used to transmit a broadcast program different from the 2K broadcast program transmitted in segments 1 to 7 (B layer) of the horizontally polarized signal in segments 1 to 7 (B layer) of the vertically polarized signal. Alternatively, segments 1 to 7 (B layer) of the vertically polarized signal may be used for other data transmission or may be unused. The identification information on how to use the segments 1 to 7 (B layer) of the vertical polarization signal is determined by the parameters of the 4K signal transmission layer identification of the TMCC signal already described, the parameters of the additional layer transmission identification, etc., on the receiving device side. can be transmitted to Broadcast receiving apparatus 100 can identify how to treat segments 1 to 7 (B layer) of the vertically polarized signal based on these parameters. In addition, a 2K broadcast program transmitted using the B layer of the horizontal polarized signal and a 4K broadcast program transmitted using the C layer of both the horizontal and vertical polarized signals are the same broadcast programs with different resolutions. It may be simultaneous broadcasting, or broadcasting programs with different contents may be transmitted. Segment 0 of both horizontal/vertical polarization signals carries the same one-segment broadcast program.

The example of (2) in FIG. 7A is a modification different from (1). In the example (2), 4K broadcast programs are transmitted using a total of 10 segments, segments 1 to 5 (B layer) of the horizontally polarized signal and segments 1 to 5 (B layer) of the vertically polarized signal. 2K broadcast programs are transmitted using segments 6 to 12 (layer C) of the horizontally polarized signal. In example (2), segments 6 to 12 (C layer) of the vertically polarized signal are used to transmit the same broadcast program as the 2K broadcast program transmitted by segments 6 to 12 (C layer) of the horizontally polarized signal. can be Segments 6 to 12 (layer C) of the vertically polarized signal may be used to transmit a broadcast program different from the 2K broadcast program transmitted by segments 6 to 12 (layer C) of the horizontally polarized signal. Segments 6 to 12 (layer C) of the vertically polarized signal may be used for other data transmission or may be unused. Since these pieces of identification information are also the same as in the example (1), their description will be omitted.

In the examples of (1) and (2) in FIG. 7A, examples in which the horizontal polarization is the main polarization have been described. I do not care.

FIG. 7B shows an example of the configuration of a broadcasting system for an advanced digital terrestrial broadcasting service using the dual polarization transmission system according to the embodiment of the present invention. This shows both a transmitting side system and a receiving side system of an advanced terrestrial digital broadcasting service using a dual-polarization transmission system. The configuration of the broadcasting system for the advanced terrestrial digital broadcasting service using the dual-polarization transmission system is basically the same as the configuration of the broadcasting system shown in FIG. It becomes a dual-polarized transmitting antenna capable of simultaneously transmitting a wave signal and a vertically polarized wave signal. In addition, in the example of FIG. 7B, only the channel selection/detection unit 131H and the channel selection/detection unit 131V of the second tuner/demodulation unit 130T of the broadcast receiving apparatus 100 are extracted and described, and other operation units are omitted. are doing.

A horizontally polarized wave signal transmitted from the radio tower 300T is received by the horizontally polarized wave receiving element of the antenna 200T, which is a dual-polarized receiving antenna, and is transmitted from the connector portion 100F1 through the coaxial cable 202T1 to the channel selection/detection portion 131H. is entered in On the other hand, the vertically polarized wave signal transmitted from the radio tower 300T is received by the vertically polarized wave receiving element of the antenna 200T, and is input to the tuning/detection section 131V from the connector section 100F2 via the coaxial cable 202T2. An F-type connector is generally used for a connector section that connects an antenna (coaxial cable) and a television receiver.

Here, the user may mistakenly connect the coaxial cable 202T1 to the connector section 100F2 and connect the coaxial cable 202T2 to the connector section 100F1. In this case, there is a possibility that the channel selection/detection section 131H and the channel selection/detection section 131V cannot identify whether the input broadcast signal is a horizontal polarization signal or a vertical polarization signal. In order to prevent the above-mentioned problems, one of the connectors for connecting the antenna (coaxial cable) and the television receiver, for example, the coaxial cable 202T2 for transmitting a vertically polarized signal and the connector of the connector 100F2, may be horizontally polarized. It is conceivable that the coaxial cable 202T1 for transmitting signals and the connector portion of the connector portion 100F1 have a different shape from the F-type connector. Alternatively, the channel selection/detection unit 131H and the channel selection/detection unit 131V refer to the main signal identification of the TMCC information of each input signal to determine whether the input broadcast signal is a horizontal polarization signal or a vertical polarization signal. should be controlled to identify and operate.

FIG. 7C shows an example of a configuration different from the above, of the configuration of the broadcasting system for the advanced terrestrial digital broadcasting service using the dual-polarization transmission system according to the embodiment of the present invention. As shown in FIG. 7B, the broadcast receiving apparatus 100 has two broadcast signal input connector sections, and the configuration using two coaxial cables for connection between the antenna 200T and the broadcast receiving apparatus 100 is costly for equipment and It may not always be suitable for handling at the time of cable wiring. Therefore, in the configuration shown in FIG. 7C, a conversion unit ( converter) 201T, and the conversion unit 201T and the broadcast receiving apparatus 100 are connected by a single coaxial cable 202T3. A broadcast signal input from connector section 100F3 is demultiplexed and input to channel selection/detection section 131H and channel selection/detection section 131V. The connector section 100F3 may have a function of supplying operating power to the conversion section 201T.

The conversion unit 201T may belong to the equipment of the environment (for example, an apartment complex, etc.) in which the broadcast receiving device 100 is installed. Alternatively, it may be configured as a device integrated with the antenna 200T and installed in a house or the like. The conversion unit 201T performs frequency conversion on either the horizontally polarized wave signal received by the horizontally polarized wave receiving element of the antenna 200T or the vertically polarized wave signal received by the vertically polarized wave receiving element of the antenna 200T. process. By this processing, the horizontally polarized wave signal and the vertically polarized wave signal transmitted from the radio tower 300T to the antenna 200T using the horizontally polarized wave and the vertically polarized wave of the same frequency band are separated into mutually different frequency bands, It is possible to simultaneously transmit to the broadcast receiving apparatus 100 through the single coaxial cable 202T3. If necessary, both the horizontal polarization signal and the vertical polarization signal may be subjected to frequency conversion processing, but in this case also, the frequency bands of the two after frequency conversion must be different from each other. . Also, the broadcast receiving apparatus 100 may be provided with one broadcast signal input connector section 100F3.

FIG. 7D shows an example of frequency conversion processing. In this example, the vertical polarization signal is subjected to frequency conversion processing. Specifically, among the horizontally polarized signal and the vertically polarized signal transmitted in the frequency band of 470 to 710 MHz (band corresponding to 13 ch to 52 ch of UHF), the frequency band of the vertically polarized signal is set to 470 to 710 MHz. Convert from the frequency band to the frequency band of 770-1010 MHz. By this processing, signals transmitted using horizontal polarization and vertical polarization in the same frequency band can be simultaneously transmitted to the broadcast receiving apparatus 100 through one coaxial cable 202T3 without mutual interference. Become. Note that the horizontal polarization signal may be subjected to frequency conversion processing.

Moreover, it is preferable that the frequency conversion processing is performed on the signal transmitted by the secondary polarized wave according to the result of referring to the main signal identification of the TMCC information. As described with reference to FIG. 5H, the signal transmitted with the primary polarization is more likely to be transmitted including the current terrestrial digital broadcasting service than the signal transmitted with the secondary polarization. Therefore, in order to more preferably maintain compatibility with the current terrestrial digital broadcasting service, the frequency of the signal transmitted with the secondary polarization is not frequency-converted with the signal transmitted with the primary polarization. is suitable.

When frequency-converting a signal transmitted with secondary polarization, the frequency band of the signal transmitted with secondary polarization is lower than the frequency band of the signal transmitted with primary polarization in the converted signal. should be high. As a result, in the initial scan of the broadcast receiving apparatus 100, if the scan is started from the low frequency side and proceeds to the high frequency side, the signal transmitted with the main polarization will precede the signal transmitted with the secondary polarization. An initial scan can be performed at As a result, it is possible to more preferably perform a process of reflecting the setting by the initial scan of the current digital terrestrial broadcasting service to the setting by the initial scanning of the advanced digital terrestrial broadcasting service.

In addition, frequency conversion processing may be performed for all physical channels used in advanced terrestrial digital broadcasting services, but may be performed only for physical channels using signal transmission using a dual-polarization transmission system. .

The frequency band after conversion by frequency conversion processing is preferably between 710 and 1032 MHz. That is, when trying to receive the digital terrestrial broadcasting service and the BS/CS digital broadcasting service at the same time, the broadcasting signal of the digital terrestrial broadcasting service received by the antenna 200T and the broadcasting signal of the BS/CS digital broadcasting service received by the antenna 200B are combined. are mixed and transmitted to the broadcast receiving apparatus 100 through a single coaxial cable. In this case, since the BS/CS-IF signal uses a frequency band of about 1032 to 2150 MHz, if the frequency band after conversion by the frequency conversion process is set to be between 710 and 1032 MHz, the horizontal polarization signal It is possible to avoid interference between the broadcasting signal of the terrestrial digital broadcasting service and the broadcasting signal of the BS/CS digital broadcasting service while avoiding the interference between the terrestrial digital broadcasting service and the vertically polarized wave signal. In addition, when considering the reception of retransmitted broadcast signals by cable television (Community Antenna TV or Cable TV: CATV) stations, the frequency band of 770 MHz or less (band equivalent to UHF 62ch or less) in TV broadcasting distribution by cable television stations is used, it is more preferable to set the frequency band after conversion by the frequency conversion process to between 770 and 1032 MHz, which exceeds the band corresponding to 62ch of UHF.

Also, the bandwidth of the area between the frequency band before conversion and the frequency band after conversion by frequency conversion processing (part a in the figure) is an integer multiple of the bandwidth (6 MHz) of one physical channel. is preferably set to In this way, in the broadcast receiving apparatus 100, frequency setting control can be easily performed when, for example, the broadcast signal in the frequency band before conversion by the frequency conversion processing and the broadcast signal in the frequency band after conversion are collectively subjected to frequency scanning. There are advantages such as

As described above, in the dual-polarization transmission system according to the embodiment of the present invention, both horizontal polarization signals and vertical polarization signals are used for transmission of 4K broadcast programs. Therefore, in order to correctly reproduce a 4K broadcast program, it is necessary for the receiving side to correctly grasp the combination of the physical channels of the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization. Even if frequency conversion processing is performed and the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization for the same physical channel are input to the receiving device as signals of different frequency bands, In the broadcast receiving apparatus 100 of the present embodiment, the parameters of the TMCC information (for example, main signal identification and physical channel number identification) shown in FIGS. It is possible to correctly comprehend the combination of the broadcast signal transmitted by the vertical polarization and the broadcast signal transmitted by the vertically polarized wave. As a result, the broadcast receiving apparatus 100 of this embodiment can appropriately receive, demodulate, and reproduce a 4K broadcast program.

In the examples of FIGS. 7B, 7C, and 7D, the horizontal polarization is the main polarization, but depending on the operation, the horizontal polarization and the vertical polarization may be reversed. do not have.

As described above, the broadcast wave of digital terrestrial broadcasting transmitted by the dual-polarization transmission system described above can be received and reproduced by the second tuner/demodulator 130T of the broadcast receiving apparatus 100. The first tuner/demodulator 130C of the device 100 is also receivable. When the broadcast wave of the digital terrestrial broadcasting is received by the first tuner/demodulator 130C, among the broadcast signals of the digital terrestrial broadcasting, the broadcast signal transmitted in the layer of the advanced digital terrestrial broadcasting service is ignored. However, the broadcast signal transmitted in the layer of the current terrestrial digital broadcasting service is reproduced.

<Pass-through transmission method for advanced terrestrial digital broadcasting service>
Broadcast receiving apparatus 100 can receive signals transmitted by the pass-through transmission method. The pass-through transmission system is a system in which a broadcast signal received by a cable television station or the like is transmitted to a CATV distribution system with the same frequency or frequency-converted in the same signal system.

The pass-through method consists of (1) transmission signal band extraction and level adjustment of each terrestrial digital broadcasting signal output from the terrestrial reception antenna, and transmission to CATV facilities at the same frequency as the transmission signal frequency, and (2) terrestrial reception. There is a method of extracting the transmission signal band and adjusting the level of each terrestrial digital broadcasting signal of the antenna output and transmitting it to the CATV facility at the frequency of the VHF band, MID band, SHB band, or UHF band set by the CATV facility manager. . A device constituting a receiving amplifier for performing signal processing of the first method or a device constituting a receiving amplifier and a frequency converter for performing signal processing of the second method is an OFDM signal processor (OFDM Signal Processor: OFDM-SP).

FIG. 7E shows an example of a system configuration when the first pass-through transmission system is applied to the advanced terrestrial digital broadcasting service of the dual-polarization transmission system. FIG. 7E shows a headend facility 400C of a cable television station and a broadcast receiver 100. FIG. Further, FIG. 7F shows an example of frequency conversion processing at that time. The notation (H V) in FIG. 7F indicates a broadcast signal state in which both the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization exist in the same frequency band. ) indicates a broadcast signal transmitted with horizontal polarization, and the notation (V) indicates a broadcast signal transmitted with vertical polarization. The notations in FIGS. 7H and 7I below have the same meaning.

When the pass-through transmission of the first system is applied to the advanced terrestrial digital broadcasting service of the dual-polarization transmission system of the embodiment of the present invention, the cable television station The headend facility 400C extracts the signal band and adjusts the level, and transmits the signal at the same frequency as the transmission signal frequency. On the other hand, for the broadcast signal transmitted by vertical polarization, signal band extraction and level adjustment are performed in the head-end equipment 400C of the cable television station, and the same frequency conversion processing as described in FIG. After converting the broadcast signal into a frequency band higher than the frequency band of 470-770 MHz, which is the band corresponding to 13ch-62ch of UHF, it is transmitted. With this processing, the frequency bands of broadcast signals transmitted with horizontal polarization and those transmitted with vertical polarization do not overlap, enabling signal transmission with a single coaxial cable (or optical fiber cable). becomes. The transmitted signal can be received by the broadcast receiving apparatus 100 of this embodiment. The process of receiving and demodulating the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization included in the signal in the broadcast receiving apparatus 100 of the present embodiment is the same as the description of FIG. 7D. Therefore, re-explanation is omitted.

FIG. 7G shows an example of a system configuration when the second pass-through transmission method is applied to the advanced terrestrial digital broadcasting service of the dual-polarization transmission method. FIG. 7G shows a headend facility 400C of a cable television station and a broadcast receiver 100. FIG. FIG. 7H shows an example of frequency conversion processing at that time.

When the pass-through transmission of the second system is applied to the advanced terrestrial digital broadcasting service of the dual-polarization transmission system of the embodiment of the present invention, the cable television station The head end equipment 400C extracts the signal band and adjusts the level, performs frequency conversion processing to the frequency set by the CATV facility manager, and then transmits the signal. On the other hand, for the broadcast signal transmitted by vertical polarization, signal band extraction and level adjustment are performed in the head-end equipment 400C of the cable television station, and the same frequency conversion processing as described in FIG. (13ch to 62ch of UHF, which is a frequency band higher than the frequency band of 470 to 770 MHz), and then transmitted. In the frequency conversion processing shown in FIG. 7H, unlike FIG. 7F, the broadcast signal transmitted with horizontal polarization is not limited to the frequency band of 470 to 770 MHz, which is the band of 13ch to 62ch of UHF, but also to a lower frequency band. The frequency conversion is performed so as to widen the range and rearrange within the range of 90 to 770 MHz. With this processing, the frequency bands of broadcast signals transmitted with horizontal polarization and those transmitted with vertical polarization do not overlap, enabling signal transmission with a single coaxial cable (or optical fiber cable). becomes. The transmitted signal can be received by the broadcast receiver 100 of this embodiment. The process of receiving and demodulating the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization included in the signal in the broadcast receiving apparatus 100 of the present embodiment is the same as the description of FIG. 7D. Therefore, re-explanation is omitted.

Further, as another modification of the frequency conversion processing of the headend equipment 400C of the cable television station in FIG. 7G, the broadcast signal at the time of pass-through output after frequency conversion may be changed from the state shown in FIG. 7H to the state shown in FIG. 7I. In this case, signal band extraction and level adjustment are performed for both broadcast signals transmitted by horizontal polarization and broadcast signals transmitted by vertical polarization, and frequency conversion processing to the frequency set by the CATV facility manager. may be sent after performing In the example of FIG. 7I, both the broadcast signal transmitted with horizontal polarization and the broadcast signal transmitted with vertical polarization are frequency-rearranged in the range of 90 to 770 MHz (range from VHF1ch to UHF62ch). Since conversion is performed and the frequency band in the range beyond UHF62ch is not used, the frequency band utilization efficiency of the broadcast signal is higher than that in FIG. 7H.

In addition, since the band for rearranging the broadcast signal is wider than the frequency band of 470 to 710 MHz, which is the band of 13ch to 52ch of UHF at the time of antenna reception, as shown in the example of FIG. It is also possible to alternately rearrange the broadcast signals transmitted by vertical polarization and the broadcast signals transmitted by vertical polarization. At this time, as shown in the example of FIG. 7I, the pair of the broadcast signal transmitted by the horizontal polarization and the broadcast signal transmitted by the vertical polarization, which were on the same physical channel at the time of antenna reception, are transferred to the physical channels at the time of antenna reception. If the channels are alternately rearranged, when the broadcast receiving apparatus 100 of the present embodiment performs an initial scan from the low frequency side, the broadcast signal transmitted by the horizontal polarization and the vertical polarization that originally had the same physical channel The initial setting can be performed in order for the pair of broadcast signals transmitted in the same physical channel unit, and the initial scan can be efficiently performed.

In the examples of FIGS. 7E, 7F, 7G, 7H, and 7I, examples in which horizontal polarization is the main polarization are described, but depending on the operation, horizontal polarization and vertical polarization may be used. can be reversed.

As described above, the second tuner/demodulation unit 130T of the broadcast receiving apparatus 100 can receive and reproduce broadcast waves of the terrestrial digital broadcasting of the dual-polarization transmission system using the pass-through transmission system described above. can be received by the first tuner/demodulator 130C of the broadcast receiver 100 as well. When the broadcast wave of the digital terrestrial broadcasting is received by the first tuner/demodulator 130C, among the broadcast signals of the digital terrestrial broadcasting, the broadcast signal transmitted in the layer of the advanced digital terrestrial broadcasting service is ignored. However, the broadcast signal transmitted in the layer of the current digital terrestrial broadcasting service is reproduced.

[Transmission method 2 for advanced terrestrial digital broadcasting service]
In order to realize 4K broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service, as an example different from the above-mentioned transmission system of the advanced terrestrial digital broadcasting service according to the embodiment of the present invention, the hierarchical division multiplexing transmission system explain. The hierarchical division multiplexing transmission system according to the embodiment of the present invention is a system having some specifications in common with the current terrestrial digital broadcasting system. For example, a broadcast wave of a 4K broadcast service with a low signal level is multiplexed and transmitted on the same channel as a broadcast wave of the current 2K broadcast service. For 2K broadcasting, the reception level of 4K broadcasting is suppressed to below the required C/N, and reception is performed as before. For 4K broadcasting, while expanding transmission capacity by modulation multi-value etc., using reception technology compatible with LDM (hierarchical division multiplexing) technology, 2K broadcasting waves are canceled and reception is possible with the remaining 4K broadcasting waves. conduct.

FIG. 8A shows an example of the hierarchical division multiplexing transmission system in the advanced terrestrial digital broadcasting service according to the embodiment of the present invention. The upper layer is composed of the modulated wave of the current 2K broadcast, the lower layer is composed of the modulated wave of the 4K broadcast, the upper layer and the lower layer are multiplexed, and output as a composite wave in the same frequency band. For example, a configuration may be adopted in which 64QAM or the like is used as the modulation method in the upper hierarchy, and 256QAM or the like is used as the modulation method in the lower hierarchy. The 2K broadcast program transmitted using the upper hierarchy and the 4K broadcast program transmitted using the lower hierarchy may be simultaneous broadcasting in which broadcast programs with the same content are transmitted at different resolutions, or different content. broadcast programs may be transmitted. Here, the upper layer is transmitted with high power and the lower layer is transmitted with low power. The difference (power difference) between the modulated wave level of the upper layer and the modulated wave level of the lower layer is called an injection level (IL), which is a value set by the broadcasting station. The injection level is generally expressed by a logarithmic relative ratio (dB) of the difference in modulated wave level (difference in power).

FIG. 8B shows an example of the configuration of a broadcasting system for an advanced terrestrial digital broadcasting service using the hierarchical division multiplexing transmission system according to the embodiment of the present invention. The configuration of the broadcasting system for the advanced terrestrial digital broadcasting service using the hierarchical division multiplexing transmission system is basically the same as the configuration of the broadcasting system shown in FIG. It is a transmission antenna that transmits a broadcast signal in which 2K broadcast of the hierarchy and 4K broadcast of the lower hierarchy are multiplexed. In addition, in the example of FIG. 8B, only the channel selection/detection section 131L of the third tuner/demodulation section 130L of the broadcast receiving apparatus 100 is extracted and described, and other operation sections are omitted.

A broadcast signal received by antenna 200L is input from connector section 100F4 to tuning/detection section 131L via converter 201L and coaxial cable 202L. Here, in the above configuration, when a broadcast signal is transmitted from the antenna 200L to the broadcast receiving apparatus 100, as shown in FIG. Also good. That is, when the antenna 200L is installed on the roof of an apartment building or the like, and a broadcast signal is transmitted to the broadcast receiver 100 in each room via the coaxial cable 202L having a long cable length, the broadcast signal is attenuated. In 131L, there is a possibility that 4K broadcast waves in the lower hierarchy cannot be correctly received.

Therefore, in order to prevent the aforementioned problem, the conversion unit 201L performs frequency conversion amplification processing on the 4K broadcast signal in the lower layer. The frequency conversion amplification process converts the frequency band of the 4K broadcast signal in the lower hierarchy from the frequency band of 470 to 710 MHz (band corresponding to UHF 13ch to 52ch) to, for example, 770 to 1010MHz exceeding the band corresponding to UHF 62ch. frequency band. Furthermore, processing is performed to amplify the 4K broadcast signal of the lower hierarchy to a signal level that is not affected by cable attenuation. By performing such processing, it is possible to avoid interference between 2K broadcast signals and 4K broadcast signals and to avoid the influence of attenuation of broadcast signals during transmission through coaxial cables. In addition, when the influence of attenuation does not matter, such as when the cable length of the coaxial cable 202L is short, the converter 201L and the frequency conversion amplification process may be omitted.

In addition, the frequency band after conversion by the frequency conversion amplification process is between 710 and 1032 MHz, which exceeds the band corresponding to 52ch of UHF, or between 770 and 1032MHz, which exceeds the band corresponding to 62ch of UHF (retransmission by cable TV stations, etc.). In the case of ), the bandwidth of the area between the frequency band before conversion and the frequency band after conversion by frequency conversion amplification processing is an integer multiple of the bandwidth (6 MHz) of one physical channel and that the frequency conversion amplification process may be performed only for physical channels that use signal transmission by the hierarchical division multiplexing transmission method. Since it is the same as the description of the present embodiment according to , the repetitive description will be omitted.

Note that the broadcast receiving apparatus 100 of the present embodiment determines whether the received broadcast signal is a broadcast signal transmitted in the lower hierarchy or a broadcast signal transmitted in the upper hierarchy according to the TMCC information described with reference to FIG. 5H. Identification is possible using upper and lower layer identification bits. Further, the broadcast receiving apparatus 100 of the present embodiment uses the frequency conversion processing identification bit of the TMCC information described with reference to FIG. can be identified by Further, the broadcast receiving apparatus 100 of the present embodiment uses the 4K signal transmission layer identification bit of the TMCC information described in FIG. It is possible to identify These identification processes can be performed by demodulating the data carrier and referring to the control information contained in the stream. Referencing the parameters of the TMCC information described above for identification makes the process easier and faster.

Note that the channel selection/detection unit 131L of the third tuner/demodulation unit 130L of the broadcast receiving apparatus 100 according to the embodiment of the present invention has a reception function compatible with LDM (hierarchical division multiplexing) technology, as already described. Therefore, the converter 201L shown in FIG. 8C is not necessarily required between the antenna 200L and the broadcast receiving apparatus 100.

As described above, the broadcast wave of digital terrestrial broadcasting transmitted by the hierarchical division multiplexing transmission system described above can be received and reproduced by the third tuner/demodulator 130L of the broadcast receiving apparatus 100. The first tuner/demodulator 130C of the device 100 is also receivable. When the broadcast wave of the digital terrestrial broadcasting is received by the first tuner/demodulator 130C, among the broadcast signals of the digital terrestrial broadcasting, the broadcast signal transmitted in the layer of the advanced digital terrestrial broadcasting service is ignored. However, the broadcast signal transmitted in the layer of the current digital terrestrial broadcasting service is reproduced.

[MPEG-2 TS system]
The broadcasting system of this embodiment is compatible with MPEG-2 TS, which is used in current terrestrial digital broadcasting services, etc., as a media transport method for transmitting data such as video and audio. Specifically, the format of the stream transmitted by the OFDM transmission wave in FIG. 4D(1) is MPEG-2 TS, and among the OFDM transmission waves in FIG. 4D(2) and FIG. MPEG-2 TS is the format of the stream transmitted in the layer where the digital broadcasting service is transmitted. Also, the format of the stream obtained by demodulating the transmission wave in the first tuner/demodulator 130C of the broadcast receiving apparatus 100 of FIG. 2 is MPEG-2 TS. Among the streams obtained by demodulating the transmission waves in the second tuner/demodulator 130T, the format of the stream corresponding to the layer in which the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS. Similarly, among the streams obtained by demodulating the transmission waves in the third tuner/demodulator 130L, the format of the stream corresponding to the layer in which the current terrestrial digital broadcasting service is transmitted is MPEG-2 TS.

MPEG-2 TS is characterized by multiplexing components such as video and audio constituting a program into one packet stream together with control signals and clocks. Since the clock is handled as one packet stream, it is suitable for transmitting one content over one transmission path with guaranteed transmission quality, and is used in many current digital broadcasting systems. In addition, it is possible to realize two-way communication via two-way networks such as fixed networks and mobile networks, and by linking functions using broadband networks with digital broadcasting services, additional content can be acquired via broadband networks. It is possible to correspond to a broadcast communication cooperation system that combines arithmetic processing in a server device, presentation processing by cooperation with a mobile terminal device, etc. with a digital broadcasting service.

FIG. 9A shows an example of a protocol stack of transmission signals in a broadcasting system using MPEG-2 TS. In MPEG-2 TS, PSI, SI and other control signals are transmitted in section format.

[Control signal of broadcasting system using MPEG-2 TS system]
MPEG-2 TS system control information includes a table mainly used for program sequence information and a table used for other than program sequence information. Tables are transmitted in section format and descriptors are placed within the table.

<Tables used in service information>
FIG. 9B shows a list of tables used in the program sequence information of the MPEG-2 TS broadcasting system. In this embodiment, the following table is used as the table used in the program arrangement information.

(1) PAT (Program Association Table)
(2) CAT (Conditional Access Table)
(3) PMT (Program Map Table)
(4) NIT (Network Information Table)
(5) SDT (Service Description Table)
(6) BAT (Bouquet Association Table)
(7) EIT (Event Information Table)
(8) RST (Running Status Table)
(9) TDT (Time and Date Table)
(10) TOT (Time Offset Table)

(11) LIT (Local Event Information Table)
(12) ERT (Event Relation Table)
(13) ITT (Index Transmission Table)
(14) PCAT (Partial Content Announcement Table)
(15) ST (Stuffing Table)
(16) BIT (Broadcaster Information Table)
(17) NBIT (Network Board Information Table)
(18) LDT (Linked Description Table)
(19) AMT (Address Map Table)
(20) INT (IP/MAC Notification Table)
(21) Tables set by business operators

<Table used in digital broadcasting>
FIG. 9C shows a list of tables used other than program sequence information in the MPEG-2 TS broadcasting system. In this embodiment, the following table is used as a table other than the program arrangement information.

(1) ECM (Entitlement Control Message)
(2) EMM (Entitlement Management Message)
(3) DCT (Download Control Table)
(4) DLT (Download Table)
(5) DIT (Discontinuity Information Table)
(6) SIT (Selection Information Table)
(7) SDTT (Software Download Trigger Table)
(8) CDT (Common Data Table)
(9) DSM-CC section (10) AIT (Application Information Table)
(11) DCM (Download Control Message)
(12) DMM (Download Management Message)
(13) Tables set by business operators

<Descriptor used in service information>
9D, 9E and 9F show a list of descriptors used in the service information of the MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in the program arrangement information.

(1) Conditional Access Descriptor
(2) Copyright Descriptor
(3) Network Name Descriptor
(4) Service List Descriptor
(5) Stuffing Descriptor
(6) Satellite Delivery System Descriptor
(7) Terrestrial Delivery System Descriptor
(8) Bouquet Name Descriptor
(9) Service Descriptor
(10) Country Availability Descriptor

(11) Linkage Descriptor
(12) NVOD Reference Descriptor
(13) Time Shifted Service Descriptor
(14) Short Event Descriptor
(15) Extended Event Descriptor
(16) Time Shifted Event Descriptor
(17) Component Descriptor
(18) Mosaic Descriptor
(19) Stream Identifier Descriptor
(20) CA Identifier Descriptor

(21) Content Descriptor
(22) Parental Rating Descriptor
(23) Hierarchical Transmission Descriptor
(24) Digital Copy Control Descriptor
(25) Emergency Information Descriptor
(26) Data Component Descriptor
(27) System Management Descriptor
(28) Local Time Offset Descriptor
(29) Audio Component Descriptor
(30) Target Region Descriptor

(31) Hyperlink Descriptor
(32) Data Content Descriptor
(33) Video Decode Control Descriptor
(34) Basic Local Event Descriptor
(35) Reference Descriptor
(36) Node Relation Descriptor
(37) Short Node Information Descriptor
(38) STC Reference Descriptor
(39) Partial Reception Descriptor
(40) Series Descriptor

(41) Event Group Descriptor
(42) SI transmission parameter descriptor (SI Parameter Descriptor)
(43) Broadcaster Name Descriptor
(44) Component Group Descriptor
(45) SI Prime TS Descriptor
(46) Board Information Descriptor
(47) LDT Linkage Descriptor
(48) Connected Transmission Descriptor
(49) TS Information Descriptor
(50) Extended Broadcaster Descriptor

(51) Logo Transmission Descriptor
(52) Content Availability Descriptor
(53) Carousel Compatible Composite Descriptor
(54) Conditional Playback Descriptor
(55) AVC Video Descriptor
(56) AVC Timing and HRD Descriptor
(57) Service Group Descriptor
(58) MPEG-4 Audio Descriptor
(59) MPEG-4 Audio Extension Descriptor
(60) Registration Descriptor

(61) Data Broadcast Id Descriptor
(62) Access Control Descriptor
(63) Area Broadcasting Information Descriptor
(64) Material Information Descriptor
(65) HEVC Video Descriptor
(66) Hierarchy Descriptor
(67) Communication cooperation information descriptor (Hybrid Information Descriptor)
(68) Scrambler Descriptor
(69) Descriptor set by operator

<Descriptors used in digital broadcasting>
FIG. 9G shows a list of descriptors used other than the service information of the MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used as descriptors other than program service information.

(1) Partial transport stream descriptor
(Partial Transport Stream Descriptor)
(2) Network Identification Descriptor
(3) Partial transport stream time descriptor
(Partial Transport Stream Time Descriptor)
(4) Download Content Descriptor
(5) CA_EMM_TS_Descriptor (CA EMM TS Descriptor)
(6) CA Contract Information Descriptor
(7) CA Service Descriptor
(8) Carousel Identifier Descriptor
(9) Association Tag Descriptor
(10) Extended Association Tag Descriptor
(Deferred Association tags Descriptor)
(11) Network Download Content Descriptor
(Network Download Content Descriptor)
(12) Download Protection Descriptor
(13) CA Startup Descriptor
(14) Descriptors set by the operator

<Descriptor used in INT>
FIG. 9H shows a list of descriptors used in INT of the MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in INT. The descriptors used in the above-mentioned program arrangement information and the descriptors used in other than the program arrangement information are not used in INT.

(1) Target Smartcard Descriptor
(2) Target IP Address Descriptor
(3) Target IPv6 Address Descriptor
(4) IP/MAC Platform Name Descriptor
(5) IP/MAC platform provider name descriptor
(IP/MAC Platform Provider Name Descriptor)
(6) IP/MAC Stream Location Descriptor
(7) Descriptor set by the operator

<Descriptors used in AIT>
FIG. 9I shows a list of descriptors used in the AIT of the MPEG-2 TS broadcasting system. In this embodiment, the following descriptors are used in AIT. The descriptors used in the above-mentioned program arrangement information and the descriptors used in other than the program arrangement information are not used in INT.

(1) Application Descriptor
(2) Transport Protocol Descriptor
(3) Simple application location descriptor
(Simple Application Location Descriptor)
(4) Application boundary authority setting descriptor
(Application Boundary and Permission Descriptor)
(5) Autostart Priority Descriptor
(6) Cache Control Info Descriptor
(7) Randomized Latency Descriptor
(8) External application control descriptor
(External Application Control Descriptor)
(9) Recording/playback application descriptor (Playback Application Descriptor)
(10) Simple recording/playback application location descriptor
(Simple Playback Application Location Descriptor)
(11) Application Expiration Descriptor
(12) Descriptors set by the operator

[MMT system]
The broadcasting system of this embodiment can also support the MMT system as a media transport system for transmitting data such as video and audio. Specifically, of the OFDM transmission waves in FIG. 4D(2) and FIG. 4D(3), the format of the stream transmitted in the layer where the advanced terrestrial digital broadcasting service is transmitted is, in principle, the MMT format. Further, among the streams obtained by demodulating the transmission wave in the second tuner/demodulator 130T of the broadcast receiving apparatus 100 of FIG. is. Similarly, among the streams obtained by demodulating the transmission wave in the third tuner/demodulator 130L, the format of the stream corresponding to the layer in which the advanced digital terrestrial broadcasting service is transmitted is, in principle, MMT. As a modification, an MPEG-2 TS stream may be used in an advanced terrestrial digital broadcasting service. The format of the stream obtained by demodulating the transmission wave in the fourth tuner/demodulator 130B is MMT.

In recent years, the MMT system has adapted MPEG-2 to cope with environmental changes related to content distribution, such as the diversification of content, the diversification of devices that use content, the diversification of transmission paths for distributing content, and the diversification of content storage environments. This is a newly established media transport system due to the limitations of the TS system.

The code of the video signal and audio signal of the broadcast program is set to MFU (Media Fragment Unit)/MPU (Media Processing Unit), put on an MMTP (MMT Protocol) payload, MMTP packetized, and transmitted as an IP packet. Data contents and caption signals related to broadcast programs are also in the form of MFU/MPU.

For transmission of MMTP packets, UDP/IP (User Datagram Protocol/Internet Protocol) is used for broadcast transmission lines, and UDP/IP or TCP/IP (Transmission Control Protocol/Internet Protocol) is used for communication lines. Also, in a broadcast transmission line, a TLV multiplexing scheme may be used for efficient transmission of IP packets.

FIG. 10A shows the protocol stack of MMT on the broadcast transmission path. Also, FIG. 10B shows an MMT protocol stack in a communication line. The MMT system provides a mechanism for transmitting two types of control information, MMT-SI and TLV-SI. MMT-SI is control information indicating the structure of a broadcast program. The format of the MMT control message is used, and the message is put on the MMTP payload, converted into an MMTP packet, and transmitted as an IP packet. TLV-SI is control information related to multiplexing of IP packets, and provides information for channel selection and correspondence information between IP addresses and services.

[Control signal of broadcasting system using MMT method]
As described above, in the MMT system, TLV-SI and MMT-SI are prepared as control information. TLV-SI consists of tables and descriptors. Tables are transmitted in section format and descriptors are placed within the table. MMT-SI is composed of three layers: messages storing tables and descriptors, tables with elements and attributes indicating specific information, and descriptors indicating more detailed information.

<Tables used in TLV-SI>
FIG. 10C shows a list of tables used in the TLV-SI of the MMT broadcasting system. In this embodiment, the table shown below is used as the TLV-SI table.

(1) Network Information Table for TLV
(2) Address Map Table
(3) Tables set by business operators

<Descriptor used in TLV-SI>
FIG. 10D shows a list of descriptors used in TLV-SI of the MMT broadcasting system. In this embodiment, the following is used as the TLV-SI descriptor.

(1) Service List Descriptor
(2) Satellite Delivery System Descriptor
(3) System Management Descriptor
(4) Network Name Descriptor
(5) Remote Control Key Descriptor
(6) Descriptors set by business operators

<Messages used in MMT-SI>
FIG. 10E shows a list of messages used in MMT-SI of the MMT broadcasting system. In this embodiment, the following MMT-SI messages are used.

(1) PA (Package Access) message (2) M2 section message (3) CA message (4) M2 short section message (5) Data transmission message (6) Message set by operator

<Tables used in MMT-SI>
FIG. 10F shows a list of tables used in MMT-SI of the MMT broadcasting system. In this embodiment, the following MMT-SI table is used.

(1) MPT (MMT Package Table)
(2) PLT (Package List Table)
(3) LCT (Layout Configuration Table)
(4) ECM (Entitlement Control Message)
(5) EMMs (Entitlement Management Messages)
(6) CAT (MH) (Conditional Access Table (MH))
(7) DCM (Download Control Message)
(8) DMM (Download Management Message)
(9) MH-EIT (MH-Event Information Table)
(10) MH-AIT (MH-Application Information Table)

(11) MH-BIT (MH-Broadcaster Information Table)
(12) MH-SDTT (MH-Software Download Trigger Table)
(13) MH-SDT (MH-Service Description Table)
(14) MH-TOT (MH-Time Offset Table)
(15) MH-CDT (MH-Common Data Table)
(16) DDM table (Data Directory Management Table)
(17) DAM table (Data Asset Management Table)
(18) DCC table (Data Content Configuration Table)
(19) EMT (Event Message Table)
(20) Table set by the operator

<Descriptor used in MMT-SI>
10G, 10H and 10I show a list of descriptors used in MMT-SI of the MMT broadcasting system. In this embodiment, the following are used as MMT-SI descriptors.

(1) Asset Group Descriptor
(2) Event Package Descriptor
(3) Background Color Descriptor
(4) MPU Presentation Region Descriptor
(5) MPU Timestamp Descriptor
(6) Dependency Descriptor
(7) Access Control Descriptor
(8) Scrambler Descriptor
(9) Message Authentication Method Descriptor
(10) Emergency Information Descriptor

(11) MH-MPEG-4 Audio Descriptor
(12) MH-MPEG-4 audio extension descriptor
(MH-MPEG-4 Audio Extension Descriptor)
(13) MH-HEVC Descriptor
(14) MH-Linkage Descriptor
(15) MH-Event Group Descriptor
(16) MH-Service List Descriptor
(17) MH-Short Event Descriptor
(18) MH-Extended Event Descriptor
(19) Video Component Descriptor
(20) MH-Stream Identifier Descriptor

(21) MH-Content Descriptor
(22) MH-Parental Rating Descriptor
(23) MH-Audio Component Descriptor
(24) MH-Target Region Descriptor
(25) MH-Series Descriptor
(26) MH-SI Transmission Parameter Descriptor (MH-SI Parameter Descriptor)
(27) MH-Broadcaster Name Descriptor
(28) MH-Service Descriptor
(29) IP Data Flow Descriptor
(30) MH-CA Startup Descriptor

(31) MH-Type Descriptor
(32) MH-Info Descriptor
(33) MH-Expire Descriptor
(34) MH-CompressionType descriptor
(MH-Compression Type Descriptor)
(35) MH-Data Component Descriptor
(36) UTC-NPT Reference Descriptor
(37) Event Message Descriptor
(38) MH-Local Time Offset Descriptor
(39) MH-Component Group Descriptor
(40) MH-Logo Transmission Descriptor

(41) MPU Extended Timestamp Descriptor
(42) MPU Download Content Descriptor
(43) MH-Network Download Content Descriptor
(MH-Network Download Content Descriptor)
(44) Application descriptor (MH-Application Descriptor)
(45) MH-Transport Protocol Descriptor
(46) MH-Simple Application Location Descriptor
(MH-Simple Application Location Descriptor)
(47) Application Boundary Authority Setting Descriptor
(MH-Application Boundary and Permission Descriptor)
(48) MH-Autostart Priority Descriptor
(49) MH-Cache Control Info Descriptor
(50) MH-Randomized Latency Descriptor

(51) Linked PU Descriptor
(52) Locked Cache Descriptor
(53) Unlocked Cache Descriptor
(54) MH-DL Protection Descriptor
(55) Application Service Descriptor
(56) MPU Node Descriptor
(57) PU Structure Descriptor
(58) MH-Hierarchy Descriptor
(59) Content Copy Control Descriptor
(60) Content Usage Control Descriptor

(61) Emergency News Descriptor
(62) MH-CA Contract Info Descriptor
(63) MH-CA Service Descriptor
(64) MH-External Application Control Descriptor
(MH-External Application Control Descriptor)
(65) MH-Recording and Playback Application Descriptor
(MH-Playback Application Descriptor)
(66) MH-Simple Record and Play Application Location Descriptor
(MH-Simple Playback Application Location Descriptor)
(67) MH-Application Expiration Descriptor
(MH-Application Expiration Descriptor)
(68) Related Broadcaster Descriptor
(69) Multimedia Service Descriptor
(70) Descriptor set by operator

<Relationship between data transmission and each control information in the MMT method>
FIG. 10J shows the relationship between data transmission and representative tables in the MMT broadcasting system.

In the MMT broadcasting system, data transmission can be performed through a plurality of paths such as a TLV stream via a broadcasting transmission line and an IP data flow via a communication line. The TLV stream includes TLV-SI such as TLV-NIT and AMT, and IP data flow, which is a data flow of IP packets. An IP data flow includes a video asset including a series of video MPUs and an audio asset including a series of audio MPUs. Furthermore, a caption asset including a series of caption MPUs, a text superimposition asset including a series of text superimposition MPUs, a data asset including a series of data MPUs, and the like may be included. These various assets are associated in units of packages by an MPT (MMT package table) that is stored and transmitted in a PA message. Specifically, the package ID and the asset ID of each asset included in the package may be associated and described in the MPT.

The assets that make up the package can be only assets in the TLV stream, but they can also include assets that are transmitted in the IP data flow of the communication line, as shown in Figure 10J. This can be realized by including the location information of each asset included in the package in the MPT so that the broadcast receiving apparatus 100 can grasp the reference destination of each asset. As the location information of each asset,
(1) Data multiplexed in the same IP data flow as MPT (2) Data multiplexed in IPv4 data flow (3) Data multiplexed in IPv6 data flow (4) Multiplexed in broadcast MPEG2-TS (5) data multiplexed in MPEG2-TS format in the IP data flow (6) data at the specified URL, etc. .

The MMT broadcasting system also has the concept of an event. An event is a concept indicating a so-called program handled by MH-EIT sent in an M2 section message. Specifically, in the package indicated by the event package descriptor stored in the MH-EIT, a series of data included in the duration time period from the start time stored in the MH-EIT is included in the concept of the event. The data it contains. MH-EIT can be used in the broadcast receiving apparatus 100 for various processes (for example, program guide generation processing, control of recording reservation and viewing reservation, copyright management processing such as temporary storage, etc.) for each event. can be done.

[Channel setting processing of broadcast receiving device]
<Initial Scan>
In current terrestrial digital broadcasting, network IDs are different for each transmission master, and information on other stations is generally not described in the NIT. Therefore, the broadcast receiving apparatus 100 of the embodiment of the present invention, which has compatibility with the current terrestrial digital broadcasting, is compatible with the terrestrial digital broadcasting of the embodiment of the present invention (advanced terrestrial digital broadcasting, or advanced terrestrial digital broadcasting and current terrestrial digital broadcasting). It has a function to search (scan) all receivable channels at the reception point and create a service list (receivable frequency table) based on the service ID for digital terrestrial broadcasting that is transmitted simultaneously on a separate layer from broadcasting). There is a need. In addition, in areas where the same network ID can be received on different physical channels by MFN (Multi Frequency Network), basically select a channel with good reception C / N or BER (Bit Error Rate) It is only necessary to operate so as to store it in the service list.

In the advanced BS digital broadcast or advanced CS digital broadcast received by the fourth tuner/demodulator 130B of the broadcast receiver 100 according to the embodiment of the present invention, the broadcast receiver 100 obtains the service list stored in the TLV-NIT. and memorize it, there is no need to create a service list. Therefore, the advanced BS digital broadcast or the advanced CS digital broadcast received by the fourth tuner/demodulator 130B does not require initial scanning and rescanning, which will be described later.

<Rescan>
The broadcast receiving apparatus 100 of the embodiment of the present invention has a rescanning function in preparation for the opening of a new station, the installation of a new relay station, the change of the receiving point of the television receiver, and the like. When changing the preset information, the broadcast receiving apparatus 100 can notify the user to that effect.

<Operation example at initial/rescan>
FIG. 11A shows an example of an operation sequence of channel setting processing (initial/rescan) of the broadcast receiving apparatus 100 according to the embodiment of the present invention. Although FIG. 1 shows an example in which MPEG-2 TS is used as the media transport method, basically the same processing is performed when the MMT method is used.

In the channel setting process, first, the reception function control unit 1102 sets the residential area (selects the area where the broadcast receiving apparatus 100 is installed) based on the user's instruction (S101). At this time, instead of the user's instruction, the residential area may be automatically set based on the installation position information of the broadcast receiving apparatus 100 acquired by predetermined processing. As an example of the installation position information acquisition process, information may be acquired from the network to which the LAN communication unit 121 is connected, or information regarding the installation position may be acquired from an external device to which the digital I/F unit 125 is connected. . Next, the initial value of the frequency range to be scanned is set, and the tuner/demodulator (the first tuner/demodulator 130C, the second tuner/demodulator 130T, and the third tuner/demodulator 130C) is tuned to the set frequency. If the demodulation unit 130L is not distinguished, it is described in this way.

The tuner/demodulator performs tuning based on the instruction (S103), and if the lock to the set frequency is successful (S103: Yes), the process proceeds to S104. If the lock is not successful (S103: No), the process proceeds to S111. In the process of S104, the C/N is confirmed (S104), and if the C/N is above a predetermined value (S104: Yes), the process proceeds to S105 to perform the reception confirmation process. If the C/N equal to or higher than the predetermined value is not obtained (S104: No), the process proceeds to S111.

In the reception confirmation process, the reception function control unit 1102 first acquires the BER of the received broadcast wave (S105). Next, by acquiring and collating the NIT, it is confirmed whether or not the NIT is valid data (S106). If the NIT acquired in the process of S106 is valid data, the reception function control unit 1102 acquires information such as the transport stream ID and the original network ID from the NIT. Also, the distribution system information on the physical conditions of the broadcast transmission path corresponding to each transport stream ID/original network ID is obtained from the terrestrial distribution system descriptor. It also acquires a list of service IDs from the service list descriptor.

Next, the receiving function control unit 1102 confirms whether or not the transport stream ID obtained in the process of S106 has already been obtained by checking the service list stored in the receiving device (S107). . If the transport stream ID acquired in the process of S106 is not already acquired (S107: No), various information acquired in the process of S106 is added to the service list in association with the transport stream ID (S108). If the transport stream ID obtained in the process of S106 has already been obtained (S107: Yes), the BER obtained in the process of S105 is compared with the BER when the transport stream ID described in the service list is obtained. (S109). As a result, if the BER acquired in the process of S105 is better (S109: Yes), the service list is updated using the various information acquired in the process of S106 (S110). If the BER acquired in the process of S105 is not better (S109: No), the various information acquired in the process of S106 is discarded.

Also, during the service list creation (addition/update) processing described above, the remote control key ID may be obtained from the TS information descriptor, and the representative service for each transport stream may be associated with the remote control key. This process enables one-touch channel selection, which will be described later.

After completing the reception confirmation process, the reception function control unit 1102 confirms whether or not the current frequency setting is the final value of the frequency range to be scanned (S111). If the current frequency setting is not the final value of the frequency range to be scanned (S111: No), the frequency value set in the tuner/demodulator is increased (S112), and the processes of S103 to S110 are repeated. If the current frequency setting is the final value of the frequency range to be scanned (S111: Yes), the process proceeds to S113.

In the process of S113, the service list created (added/updated) in the process described above is presented to the user as a result of the channel setting process (S113). Also, if there is duplication of remote control keys, etc., the user may be notified to that effect and urged to change the remote control key settings (S114). The service list created/updated in the above process is stored in a non-volatile memory such as ROM 103 and storage (accumulation) section 110 of broadcast receiving apparatus 100 .

FIG. 11B shows an example of the NIT data structure. "transport_stream_id" in the figure corresponds to the aforementioned transport stream ID, and "original_network_id" corresponds to the original network ID. FIG. 11C also shows an example data structure of a Terrestrial Distribution System Descriptor. "guard_interval", "transmission_mode", "frequency", etc. in the figure correspond to the aforementioned distribution system information. FIG. 11D shows an example data structure of a service list descriptor. "service_id" in the figure corresponds to the aforementioned service ID. FIG. 11E shows an example of the data structure of the TS information descriptor. "remote_control_key_id" in the drawing corresponds to the aforementioned remote control key ID.

Note that the broadcast receiving apparatus 100 may be controlled so as to appropriately change the frequency range to be scanned according to the broadcast service to be received. For example, when the broadcast receiving apparatus 100 is receiving broadcast waves of the current terrestrial digital broadcasting service, it is controlled to scan the frequency range of 470 to 770 MHz (corresponding to physical channels 13ch to 62ch). That is, the initial value of the frequency range is set to 470 to 476 MHz (center frequency of 473 MHz), the final value of the frequency range is set to 764 to 770 MHz (center frequency of 767 MHz), and the frequency value is increased by +6 MHz in the processing of S112. control so as to

Further, when the broadcast receiving device 100 receives broadcast waves including advanced terrestrial digital broadcasting services, the frequency range of 470 to 1010 MHz (frequency conversion processing shown in FIG. 7D and frequency conversion amplification processing shown in FIG. 8C (because it may be doing). That is, the initial value of the frequency range is set to 470 to 476 MHz (center frequency of 473 MHz), the final value of the frequency range is set to 1004 to 1010 MHz (center frequency of 1007 MHz), and the frequency value is increased by +6 MHz in the processing of S112. control so as to Even if the broadcast receiving device 100 is receiving the advanced terrestrial digital broadcasting service, if it is determined that the above-described frequency conversion processing and frequency conversion amplification processing are not performed, the frequency of 470 to 770 MHz It should be controlled so that only the range is scanned. The selection control of the frequency range to be scanned can be performed by the broadcast receiving apparatus 100 based on the system identification and frequency conversion process identification of the TMCC information.

Further, when the broadcasting system of the embodiment of the present invention has the configuration shown in, for example, FIG. One of the unit 131H and the channel selection/detection unit 131V may scan the frequency range of 470 to 770 MHz, and the other may scan the frequency range of 770 to 1010 MHz (detected by the other channel selection/detection unit). (when frequency conversion processing is applied to the transmitted wave in the polarized wave). Based on the system identification and frequency conversion processing identification of the TMCC information, if such control is performed, scanning in unnecessary frequency ranges can be omitted, and the time required for channel setting can be reduced. Furthermore, in this case, both the tuning/detection unit 131H and the tuning/detection unit 131V may advance the operation sequence of FIG. 11A in parallel to synchronize the loop of frequency up S112 in the operation sequence of FIG. 11A. . At this time, in the same timing loop in the frequency-up loop in the operation sequence of FIG. Then, it becomes possible to decode the control information and the like inside the packet stream of the advanced terrestrial digital service transmitted by the pair of the horizontal polarization signal and the vertical polarization signal, and acquire it during the loop processing. This is preferable because scanning and service list creation proceed efficiently.

Similarly, the broadcast receiving apparatus 100 has a so-called double tuner configuration in which a plurality of tuner/demodulation units (channel selection/detection units) are further provided in the configuration shown in FIG. 8B (for example, a plurality of third tuner/demodulation units 130L are provided configuration), and when receiving an advanced terrestrial digital broadcasting service of the hierarchical division multiplexing transmission system, one of the double tuners scans the frequency range of 470 to 770 MHz, and the other scans the frequency range of 770 to 1010 MHz. (when frequency conversion amplification processing is performed). By controlling in this manner, it is possible to reduce the time required for channel setting as described above.

As explained with reference to FIGS. 8A, 8B, and 8C, in the configuration shown in FIG. 8B, the terrestrial digital broadcasting service transmitted in either the upper hierarchy or the lower hierarchy is the current terrestrial digital broadcasting service. be. Therefore, for example, of the frequency range of 470 to 770 MHz and the frequency range of 770 to 1010 MHz, the frequency range in which the current terrestrial digital broadcasting service is transmitted is scanned by the first tuner/demodulator 130C, and the other frequency range is scanned. Scanning may be performed in parallel by the third tuner/demodulator 130L. In this case as well, it is possible to reduce the time required for channel setting in the same manner as the above-described parallel scanning by the double tuner of the third tuner/demodulator 130L. Whether the current digital terrestrial broadcasting service is transmitted or the advanced digital terrestrial broadcasting service is transmitted in the frequency range of 470 to 770 MHz or the frequency range of 770 to 1010 MHz depends on the operation of initial scanning/rescanning. Before starting the sequence, two points, one for each frequency range, for example, 470 to 476 MHz (center frequency 473 MHz) and 770 to 776 MHz (center frequency 773 MHz), are scanned by the third tuner/demodulator 130L. It can be identified by receiving, acquiring TMCC information transmitted on each frequency, and referring to parameters (for example, system identification parameters) stored in the TMCC information.

In the advanced terrestrial digital broadcasting service of the dual-polarization transmission system, for example, both the horizontally polarized wave signal and the vertically polarized wave signal, such as the 4K broadcast program of the C layer shown in the hierarchical division example (1) of FIG. 7A For channels with broadcast programs that transmit using Include it in the list. Further, in the case of the 2K broadcast program on the B layer shown in the figure, when the same broadcast program is transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal, the same transport Even if the ID is detected, it can be stored in the service list as one channel. That is, when the same broadcast program is transmitted in the same hierarchy transmitted with different polarized waves, it is recognized as being merged into one channel and not recognized as separate channels. In this way, in the channel selection process using the service list, it is possible to avoid user confusion due to the existence of exactly the same broadcast program on another channel.

On the other hand, in an advanced terrestrial digital broadcasting service using a dual-polarization transmission system, when different broadcast programs are transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal (B If a tier is treated as a virtual D tier), it is stored in the service list as a different channel. Whether or not the same broadcast program is transmitted in the B layer of the horizontal polarization signal and the B layer of the vertical polarization signal is determined by referring to the additional layer transmission identification parameter of the TMCC information in the broadcast receiving apparatus 100. If you judge, you can identify it.

[Channel selection processing of broadcast receiving device]
The broadcast receiving apparatus 100 according to the embodiment of the present invention has functions for program selection, such as one-touch channel selection using a one-touch key on a remote control, channel up/down channel selection using a channel up/down key on a remote control, and 10 key on a remote control. It has functions such as direct channel selection by directly inputting the 3-digit number used. Any channel selection function may be performed using the information stored in the service list generated by the initial scanning/rescanning described above. In addition, after tuning, the information of the channel selected by banner display etc. ), presence/absence of video resolution up/down conversion, number of audio channels, presence/absence of audio down-mix, etc.). In this way, the user can visually obtain information on the channel after tuning, and can confirm whether or not the desired channel has been tuned. An example of processing in each channel selection method is described below.

<Example of processing for one-touch channel selection>
(1) By pressing a one-touch key on the remote control, the service of "service_id" specified by "remote_control_key_id" is selected.
(2) Set last mode and display channel information after tuning.

<Processing example of up/down channel selection by channel up/down button>
(1) By pressing the channel up/down key on the remote control, channels are selected in the order of the three-digit number used for direct channel selection.
(1-1) When the up key is pressed, the upper adjacent service of the three-digit number is selected. However, if the current three-digit number is the maximum value in the service list, the service with the minimum number is selected.
(1-2) When the down key is pressed, select the adjacent service on the lower side of the three-digit number. However, if the current three-digit number is the minimum value in the service list, the service with the maximum number is selected.
(2) Set last mode and display channel information after tuning.

<Example of processing for direct channel selection>
(1) When direct channel selection is selected, the system waits for input of a three-digit number.
(2-1) If the input of the 3-digit number is not completed within a predetermined time (about 5 seconds), the normal mode is restored and the channel information of the currently selected service is displayed.
(2-2) When the input of the 3-digit number is completed, it is determined whether or not the channel exists in the service list of the receivable frequency table, and if not, a message such as "This channel does not exist" is displayed. do.
(3) If there is a channel, perform channel selection processing, set the last mode, and display channel information after channel selection.

Note that the channel selection operation is performed based on the SI, and when it is determined that the broadcasting is suspended, it may have a function of displaying that fact to notify the user.

<Remote controller for broadcast receiver>
FIG. 12A shows an example of an external view of a remote controller (remote controller) used for inputting operation instructions to the broadcast receiving apparatus 100 according to the embodiment of the present invention.

The remote controller 180R has a power key 180R1 for powering on/off (standby on/off) the broadcast receiving apparatus 100, and cursor keys (up, down, left, right) 180R2 for moving the cursor up, down, left, and right. , a determination key 180R3 for determining the item at the cursor position as a selection item, and a return key 180R4.

The remote control 180R also includes a network switching key (advanced terrestrial digital broadcasting, terrestrial digital broadcasting, advanced BS, BS, CS) 180R5 for switching the broadcasting network received by the broadcast receiving apparatus 100. FIG. The remote controller 180R has one-touch keys (1 to 12) 180R6 used for one-touch tuning, channel up/down keys 180R7 used for channel up/down tuning, and three-digit number input for direct tuning. and 10 keys used for In the example shown in the figure, the 10 key is also used as the one-touch key 180R6, and in the case of direct channel selection, a three-digit number can be input by operating the one-touch key 180R6 after pressing the key 180R8 directly. .

The remote controller 180R also has an EPG key 180R9 for displaying a program table and a menu key 180RA for displaying a system menu. The program table and system menu can be operated in detail by using the cursor key 180R2, decision key 180R3, and return key 180R4.

The remote controller 180R also includes a d key 180RB used for data broadcasting services, multimedia services, etc., a link key 180RC for displaying a list of broadcast communication link services and corresponding applications, and color keys (blue, red, green, etc.). , yellow) 180RD. In the data broadcasting service, multimedia service, broadcast communication cooperation service, etc., detailed operations can be performed using the cursor key 180R2, enter key 180R3, return key 180R4, and color key 180RD.

The remote controller 180R also includes a video key 180RE for selecting a related video, a voice key 180RF for switching the audio ES and switching between two languages, and a key 180RF for switching subtitles on/off and switching subtitle languages. and a subtitle key 180RG for The remote controller 180R also includes a volume key 180RH for increasing/decreasing the volume of audio output, and a mute key 180RI for switching ON/OFF of the audio output.

<Processing example of network switching by advanced terrestrial digital key>
The remote controller 180R of the broadcast receiving apparatus 100 of the embodiment of the present invention has an "advanced terrestrial digital key", a "terrestrial digital key", an "advanced BS key", a "BS key" and a "CS key" as the network switching key 180R5. Here, "advanced terrestrial digital key" and "terrestrial digital key" are used in the advanced terrestrial digital broadcasting service, for example, when simultaneous broadcasting of 4K broadcast programs and 2K broadcast programs is carried out in different layers, "advanced terrestrial digital key" It may be configured such that 4K broadcast program selection is prioritized during channel selection in the depressed state, and 2K broadcast program selection is prioritized during channel selection in the "terrestrial digital key" depressed state. By controlling in this way, for example, when there are many errors in the transmission wave of the 4K broadcast program under conditions where it is possible to receive the 4K broadcast program, pressing the "terrestrial digital key" will force the 2K broadcast. Control such as selection of a program becomes possible.

<Screen display example when selecting a channel>
As described above, the broadcast receiving apparatus 100 according to the embodiment of the present invention, when executing channel selection by one-touch tuning, channel up/down tuning, direct tuning, or the like, displays the selected channel by banner display or the like. It has the function of displaying information.

FIG. 12B shows an example of banner display at the time of channel selection. A banner display 192A1 is an example of a banner display displayed when a 2K broadcast program is selected. For example, the program name, program start/end time, network type, remote control direct channel selection key number, and service logo. and a three-digit number should be displayed. Also, the banner display 192A2 is an example of a banner display displayed when a 4K broadcast program is selected. For example, in addition to the information similar to the banner display 192A1 described above, the program being received is a 4K broadcast program. A mark that symbolizes "altitude" is also displayed. Further, when resolution conversion processing, downmix processing, or the like has been performed, a display to that effect may be provided. An example of the banner display 192A2 indicates that down-conversion processing from UHD resolution to HD resolution and down-mixing processing from 22.2ch to 5.1ch have been performed.

By performing these displays in the broadcast receiving device 100, when the same content is broadcast simultaneously as broadcast programs of different quality such as 2K broadcast programs and 4K broadcast programs by simultaneous broadcasting etc., which broadcast program The user can preferably grasp whether is displayed.

According to the advanced digital broadcasting service system having some or all of the functions according to the embodiments of the present invention described above, more sophisticated advanced digital broadcasting services are available in consideration of compatibility with current digital broadcasting services. It becomes possible to provide transmission technology and reception technology for broadcasting services. In other words, it is possible to provide a technique for more preferably transmitting or receiving advanced digital broadcasting services.

(Example 2)
A second embodiment of the present invention will be described. Embodiment 2 of the present invention is the digital broadcasting system according to Embodiment 1, which is configured so that the injection level can be changed. Differences from the first embodiment will be described below. Other configurations, processes, and operations other than the points described below are the same as those in the first embodiment, and thus descriptions thereof will be omitted.

In Embodiment 1, the hierarchical division multiplexing transmission system shown in FIG. 8A has been described as an example of a transmission system for realizing 4K broadcasting while maintaining the viewing environment of the current terrestrial digital broadcasting service. As described above, the difference between the modulated wave level of the upper layer and the modulated wave level of the lower layer (difference in transmission power) is called an injection level (IL), which is a value defined by the broadcasting station. As described above, the injection level is generally represented by a logarithmic relative ratio (dB) of the modulated wave level difference (power difference). It is known that the reception range of the lower hierarchical modulated wave varies according to the modulated wave level of the upper hierarchical modulated wave and the injection level, and that when the injection level is reduced, the reception range of the lower hierarchical modulated wave expands. . The details of the relationship between the injection level and the modulated wave level will be described later. Note that changing the injection level can also be expressed as changing the transmission power difference between the upper layer modulated wave and the lower layer modulated wave.

FIG. 13 shows an example of the reception range of the advanced terrestrial digital broadcasting service using the hierarchical division multiplexing transmission system according to this embodiment. In FIG. 13(1), a transmission wave of hierarchical division multiplexing is transmitted from a radio tower 30300, and broadcast receivers 30101, 30102, 30103 and 30104 having the same configuration as the broadcast receiver 100 are installed. Inside the upper hierarchical reception range 30910, it is possible to receive the upper hierarchical modulated wave and display the broadcast program. Similarly, inside the lower layer reception range 30900, it is possible to receive the lower layer modulated wave and display the broadcast program. Since the inside of the lower layer reception range 30900 is included in the upper layer reception range 30910, it is possible to receive and display broadcast programs even for the upper layer modulated waves. When a 2K broadcast program is transmitted on the upper layer and a 4K broadcast program is transmitted on the lower layer, the broadcast receiving device 30101 can receive the modulated wave on the lower layer and display the 4K broadcast program. Also, the broadcast receiving device 30101 can receive the upper hierarchical modulation wave and display the 2K broadcast program. However, the broadcast receivers 30102 and 30103 can only receive the upper hierarchical modulated waves, and cannot correctly receive the lower hierarchical modulated waves. Therefore, only 2K broadcast programs can be displayed, and 4K broadcast programs cannot be displayed. In addition, the broadcast receiving device 30104 is out of the reception range for both the upper and lower layers, cannot receive 2K broadcast programs on the upper layer, and cannot receive 4K broadcast programs on the lower layer.

FIG. 13(2) shows an example of the reception range when the injection level is changed to be small. When the injection level is decreased, the lower layer reception range 30900 expands to the post-change lower layer reception range 30901 . Therefore, the broadcast receiving device 30102 can newly receive a 4K broadcast program transmitted by a lower layer modulated wave. On the other hand, the reception states of the receivers 30101, 30103 and 30104 do not change. At this time, in order for the broadcast receiving device 30102 to display the 4K broadcast program, rescanning, which is a setting process for reception settings, is performed to newly acquire control information regarding the reception of the 4K broadcast program and store it in the memory or the like of the receiving device. There is a need.

FIG. 14 shows an example of modulated waves of the hierarchical division multiplexing transmission system according to this embodiment.

First, FIG. 14(1) shows an example of a modulated wave transmitted from a radio tower 30300. An upper hierarchical modulated wave 30110 and a lower hierarchical modulated wave 30120 are multiplexed, and the injection level at this time is the injection level. 30112. The required upper hierarchical modulated wave C/N 30111 and the required lower hierarchical modulated wave C/N 30121 are C/Ns with which broadcast receiving apparatus 100 can receive and display a broadcast program without error, and are modulation parameters of each modulated wave. , that is, a value derived from the carrier modulation mapping scheme, error correction scheme, coding rate, constellation format, and the like. In order for the broadcast receiving apparatus 100 to receive and display the broadcast program without error, the injection level 30112 is defined as a value obtained by adding a margin to the upper hierarchical modulated wave required C/N 30111 . The lower layer modulated wave C/N 30122 is defined by the difference between the modulated wave level of the lower layer modulated wave 30120 and the noise floor 30000, and has a value greater than the lower layer modulated wave required C/N 30121.

FIG. 14(3) shows an example of a modulated wave received by the broadcast receiving apparatus 30101. FIG. The position of the broadcast receiving device 30101 is located away from the radio tower 30300 . Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes an upper hierarchical modulated wave 30310 and a lower hierarchical modulated wave 30320 . The injection level 30112, upper layer modulated wave required C/N 30111 and lower layer modulated wave required C/N 30121 are the same as in FIG. 14(1). Due to attenuation, the modulated wave level of lower hierarchical modulated wave 30320 is lower than the modulated wave level of lower hierarchical modulated wave 30120 in FIG. 14(1). Similarly, the lower hierarchical modulated wave C/N 30322 is smaller than the lower hierarchical modulated wave C/N 30122 in FIG. 14(2). However, since the injection level 30112 is higher than the upper layer modulated wave required C/N 30111, the broadcast receiver 30101 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30310. In addition, although the lower layer modulated wave C/N 30322 is attenuated, it is still larger than the lower layer modulated wave required C/N 30121, so the broadcast receiving device 30101 receives and displays the 4K broadcast program transmitted by the lower layer modulated wave 30320. can do.

FIG. 14(5) shows an example of a modulated wave received by the broadcast receiving apparatus 30102. FIG. The position of broadcast receiving device 30102 is further away from radio tower 30300 than the position of broadcast receiving device 30101 . Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated and becomes an upper hierarchical modulated wave 30510 and a lower hierarchical modulated wave 30520 . The injection level 30112, upper layer modulated wave required C/N 30111 and lower layer modulated wave required C/N 30121 are the same as in FIG. 14(1). Due to attenuation, the modulated wave level of the lower hierarchical modulated wave 30520 is lower than the modulated wave level of the lower hierarchical modulated wave 30320 in FIG. 14(3). Similarly, the lower hierarchical modulated wave C/N30522 is even smaller than the lower hierarchical modulated wave C/N30322. Here, since the injection level 30112 is higher than the upper layer modulated wave required C/N 30111, the broadcast receiver 30102 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30310. However, as a result of the attenuation of the modulated wave level of the lower hierarchical modulation 30520, the lower hierarchical modulated wave C/N 30522 becomes smaller than the lower hierarchical modulated wave required C/N 30121. Therefore, the broadcast receiving device 30102 cannot receive and display the 4K broadcast program transmitted by the lower hierarchical modulation wave 30520.

Next, FIG. 14(2) shows an example of a modulated wave transmitted from the radio tower 30300 when the injection level is changed on the broadcasting station side. When the injection level shown in FIG. 14 is changed, the upper hierarchical modulated wave 30210 has the same modulated wave level as the upper hierarchical modulated wave 30110 in FIG. is changed so that the upper hierarchical modulated wave required C/N 30211 is smaller than the upper hierarchical modulated wave required C/N 30111 in FIG. 14(1) before the injection level is changed. Also, the lower hierarchical modulated wave C/N 30222 is set larger than the lower hierarchical modulated wave C/N 30122 . Furthermore, injection level 30212 is set to be smaller than injection level 30112 .

FIG. 14(4) shows an example of a modulated wave received by broadcast receiving apparatus 30101 when the modulated wave of FIG. 14(2) is transmitted. Broadcast receiver 30101 is located away from radio tower 30300 . Therefore, the modulated wave transmitted from the radio tower 30300 is attenuated to become an upper layer modulated wave 30410 and a lower layer modulated wave 30420 . Here, since the injection level 30212 is higher than the upper layer modulated wave required C/N 30211, the broadcast receiver 30101 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30410. In addition, although the lower hierarchical modulated wave C/N 30422 is attenuated, it is still larger than the lower hierarchical modulated wave required C/N 30221, so the broadcast receiving device 30101 receives and displays the 4K broadcast program transmitted by the lower hierarchical modulated wave 30420. can do.

FIG. 14(6) shows an example of a modulated wave received by broadcast receiving apparatus 30102 when the modulated wave of FIG. 14(2) is transmitted. The position of broadcast receiving device 30102 is further away from radio tower 30300 than the position of broadcast receiving device 30101 . Therefore, the modulated waves transmitted from the radio tower 30300 are attenuated and become upper hierarchical modulated waves 30610 and lower hierarchical modulated waves 30620 . Here, since the injection level 30212 is higher than the upper layer modulated wave required C/N 30211, the broadcast receiver 30102 can receive and display the 2K broadcast program transmitted by the upper layer modulated wave 30610. Also, the lower hierarchical modulated wave C/N 30622 is even smaller than the lower hierarchical modulated wave C/N 30422 in FIG. 14(4). However, in the example of FIG. 14(6), unlike FIG. It is higher than the side hierarchical modulation wave C/N 30122. Therefore, the lower hierarchical modulated wave C/N 30622 is maintained larger than the lower hierarchical modulated wave required C/N 30221. In other words, the broadcast receiving device 30102 changes from a state in which the 4K broadcast program transmitted by the lower layer modulated wave 30520 cannot be received and displayed due to the above-described injection level change. It means that a broadcast program can be received and displayed. Therefore, the broadcast receiving device 30102 can newly display a 4K broadcast program by performing rescanning.

As described above with reference to FIGS. 13 and 14, by changing the injection level, it is possible to expand the installation range of receivers capable of receiving broadcast programs transmitted by the lower layer modulated wave. In addition, considering mainly the receiving device installed at a predetermined position, the change in the injection level causes the broadcast program transmitted by the lower layer modulated wave to be transmitted by the lower layer modulated wave from the state where it was not possible to receive and display the broadcast program. It is possible to transition to a state in which broadcast programs can be received and displayed.

<Transmission of injection level identification>
Next, a description will be given of a technique for more suitably transitioning the reception state of a broadcast program in the receiving device by changing the injection level. First, transmission of injection level identification will be described.

First, a technique for transmitting an AC signal, which transmits additional information related to transmission control of modulated waves, including injection level parameters and the like will be described.

FIG. 15 shows a specific example of transmission parameter additional information. In Example 1, FIG. 6H was used to show an example of transmitting the parameters of the error correction method and the parameters of the constellation format. FIG. 15 of the second embodiment is a specific example of transmission parameter additional information different from FIG. 6H of the first embodiment. In the example of FIG. 15, injection level parameters and the like can be included.

Next, FIG. 16A and FIG. 16B show bit allocation examples for injection level state identification. 16A and 16B both identify which of a plurality of different states the injection level is in. FIG. However, the example of FIG. 16A and the example of FIG. 16B show examples in which each state of the injection level is defined differently.

First, the example of FIG. 16A will be described. When this parameter is "000", hierarchical division multiplex transmission is not applied. If this parameter is any one of "001" to "111", it indicates that hierarchical division multiplexing transmission is applied and the state of the injection level is any of the first state to the seventh state. there is The unit of injection level itself is expressed in dB. In the example of FIG. 16A, the injection level identification bit is set and transmitted according to which range shown in the figure the injection level of the target transmission wave is included. The broadcast receiver acquires the injection level state identification bit of FIG. 16A, and based on this, can grasp the range of the injection level of the target transmission wave.

Next, the example of FIG. 16B will be described. When this parameter is "000", hierarchical division multiplex transmission is not applied. If this parameter is any one of "001" to "111", it indicates that hierarchical division multiplexing transmission is applied and the state of the injection level is any of the first state to the seventh state. there is Here, in the example of FIG. 16B, unlike the example of FIG. 16A, the injection levels indicated by the first state to the seventh state each indicate a predetermined dB level rather than a range indicated by dB. In this case, the transmission wave injection levels that can be set by the broadcasting station are limited to these multiple options, but the accuracy of the injection level values indicated by the identification bits in FIG. 16B increases. The broadcast receiving apparatus acquires the injection level state identification bit, and based on this, can grasp what value the injection level of the target transmission wave is.

In both the example of FIG. 16A and the example of FIG. 16B, the meaning of the first state to the seventh state of the injection level does not necessarily mean that the first state transitions one state at a time. For example, when a digital broadcasting service of a 4K broadcast program is newly started using the lower layer modulation wave, the injection level state does not necessarily have to be started from the first state, and may be started from the second state, for example. Also, the injection level state may be changed one by one, or may be changed from the first state to the third state, the fifth state, or the like. These should be set according to the policy of the broadcasting station. However, changes that increase the injection level, such as changing from the fifth state to the fourth state, should be avoided. This is because it corresponds to a change that narrows the reception range of the 4K broadcast program transmitted by the lower layer modulation wave, and may cause disadvantages for the user. That is, it can be said that the first state to the seventh state, which are the injection level states shown in the example of FIG. 16A and the example of FIG. 16B, are irreversibly transitionable states in the digital broadcasting system.

Note that in the example of FIG. 16A and the example of FIG. 16B, the injection level is expressed with a resolution of about 7 states in consideration of bit efficiency. On the other hand, as another modified example of the identification bit of the injection level state, the number of bits of the identification bit may be increased to express the injection level directly as a value in dB unit indicating the modulated wave level difference. . In this case, the broadcasting station side can set more options for the injection level of the transmission wave, and the accuracy of the injection level value that can be grasped by the broadcast receiving apparatus side is increased.

Further, as another modified example of the identification bit of the injection level state, a method of calculating the modulated wave level difference using a predetermined calculation formula with the value of the transmitted bit as a variable may be used.

Also, the identification bit of the injection level state may be included in the TMCC information and transmitted.

By using the injection level state identification bit described above, the change in the injection level can be suitably communicated from the broadcasting station side to the broadcast receiving apparatus side.

<Rescan>
The broadcast receiving apparatus 100 according to the second embodiment of the present invention has a new rescanning function in order to suitably cope with changes in the injection level. This is explained below.

In the following description, the term "injection level" may be read as "injection level state". The reason for this is as follows. As already explained in the description of the injection level state identification bit in FIG. 16, in the broadcast receiving apparatus 100, there are cases where the injection level value can be identified as it is, and there are cases where the state can be identified with a certain range of values. In the latter case, even if the injection level is changed, it is determined that the state of the injection level is "no change" within a certain range. Therefore, in the case where the value of the injection level can be identified as it is in the broadcast receiving apparatus 100, "change of the injection level" can be regarded as the expression as it is in the following description. In addition, in the broadcast receiving apparatus 100, when the change in the injection level is to identify the change in units of "state" with a certain width, in the following description, the "injection level" means the "injection level status”.

FIG. 17 shows an example of a rescanning operation sequence of the broadcast receiving apparatus 100 according to the second embodiment of the present invention. Although FIG. 1 shows an example in which MPEG-2 TS is used as the media transport method, basically the same processing is performed when the MMT method is used.

First, as a prerequisite process, when creating a service list in the initial scan process, the tuner/demodulator acquires the AC information of this embodiment, and stores the injection level contained in the AC information in the non-volatile memory of the ROM 103 or storage. Each channel is stored in the various information storage area 1019 of the unit 110 . When the injection level is transmitted using TMCC, AC information should be read as TMCC information.

Broadcast receiving apparatus 100 acquires AC information in the tuner/demodulator (S30001). Next, the injection level stored in the non-volatile memory of the ROM 103 or the various information storage area 1019 (the injection level stored at the time of the initial scan or the latest rescan) and the injection level included in the acquired AC information are compared to detect the presence or absence of change, and the necessity of rescanning is determined (S30002). If the injection levels are the same, the process ends because the injection level has not been changed. If it is detected that the injection level has been changed to a small value, it means that the lower layer reception range has been expanded. In this case, since there is a possibility that the broadcast program transmitted by the lower hierarchical modulation wave can be received, it is determined that rescanning is necessary, and the process proceeds to S30003.

In the process of S30003, it is checked whether a service list of 4K broadcasting already exists in the received channel. If it exists, it indicates that the broadcast receiving apparatus 100 can receive the lower layer modulated wave even before the lower layer reception range is expanded, and rescanning is unnecessary, so the process ends. If the 4K broadcast service list does not exist, there is a possibility that the broadcast receiving apparatus 100 is newly included in the lower layer reception range, so the process proceeds to S30004. Note that the order of the processing of S30002 and the processing of S30003 may be exchanged. Note that the branch determination process by the process of S30003 has the effect of omitting new rescanning and reducing the frequency of rescanning based on changes in the injection level when the 4K broadcast service list already exists. However, if there is a change in the injection level without using the process of S30003, even if the 4K broadcast service list already exists, it may be configured to perform rescanning each time. In this case, there is an effect that the current 4K broadcast reception status can be more accurately reflected in the service list.

Next, in the process of S30004, the process waits until rescanning becomes possible. Specifically, the third tuner/demodulator 130L does not rescan when the user is viewing or recording and the tuner/demodulator is in operation. If the tuner/demodulator is in a non-operating state, such as a standby state, the process proceeds to S30005. Note that if the broadcast receiving apparatus 100 has a plurality of third tuner/demodulators 130L, even if there is a tuner/demodulator in operation such as when the user is viewing or recording, other tuners/demodulators When the demodulator is not operating and is in a standby state, rescanning may be performed using the tuner/demodulator in the standby state. Next, in the process of S30005, the third tuner/demodulator 130L is used to scan the 4K broadcast service transmitted by the lower hierarchical modulation wave. Note that the time at which the scan is performed may be defined in advance by the broadcast receiving apparatus 100, or the user may be allowed to set the scan time.

Subsequently, as a result of scanning, it is confirmed whether a new 4K broadcasting service list has been added (whether a new 4K broadcasting service has been added) (S30006). If no service list has been added (no new 4K broadcast service has been added), the broadcast receiving device 100 is included in the new reception range even after the lower layer reception range is expanded by changing the injection level. It means that it is not Therefore, the process ends. When the service list is added, the service list added as a result of rescanning is presented to the user (S30007). If a service list is added by executing a scan during the standby state, it is possible to first display that the 4K broadcast service can be received when the user turns it on, and then display the additional service list. good. Note that if a 4K broadcast service list can be created, 4K broadcast can be received, so the processing of S30007 is not necessarily required.

According to the example described using FIG. 17, the broadcast receiving apparatus 100 can detect a change in the injection level and use this as a trigger to start rescanning. This makes it possible to start rescanning more favorably. Note that "rescanning start" in the expression "rescanning start trigger" may mean the start of rescanning by the processing of S30005. It may mean to start This is the same in all of the explanations of the modifications of the "rescanning start trigger" explained below. In addition, in both the example of FIG. 17 and other examples described later, the situation in which the "rescan start trigger" occurs means that the broadcast receiving apparatus 100 recognizes or identifies that "rescan" is necessary. It has the same meaning as having done. Therefore, in the explanation of the example of FIG. 17 and other examples explained later, in the situation where the "rescan start trigger" occurs, the broadcast receiving apparatus 100 recognizes that "rescan" is necessary. or identify.

<Rescan by detection of upper layer modulation parameter change>
In the description of FIG. 17 above, a change in the injection level is detected in step S30002, and this is used as a trigger to start rescanning. On the other hand, as another modification, the trigger for starting rescanning may be detection of a change in the modulation parameter of the upper hierarchical modulated wave instead of detection of a change in the injection level. This is because when changing the injection level, it is necessary to change the upper hierarchical modulated wave required C/N. For example, in the examples of FIGS. 14(1) and 14(2), in order to change the injection level from the injection level 30112 to the level 30212, the upper hierarchical modulated wave required C/N is changed from the upper hierarchical modulated wave required C/N 30111 to It has been changed to 30211. When the detection of a change in the modulation parameter of the upper layer modulated wave is used as a trigger for starting rescanning, the modulation parameter of the upper layer modulated wave is acquired from the TMCC information and/or the AC information at the time of initial scanning or rescanning, and stored in the ROM 103. It is stored in a non-volatile memory or various information storage area 1019 of the storage unit 110 . After that, the modulation parameter of the upper hierarchical modulation wave newly acquired from the newly received TMCC information and/or AC information, and the upper hierarchical modulation stored in the non-volatile memory of the ROM 103 or the various information storage area 1019 of the storage unit 110 It compares with the modulation parameters of the wave and detects the presence or absence of changes. If there is a change in the modulation parameter of the upper hierarchical modulated wave as a result of the detection processing, rescanning may be started.

As described above, the broadcast receiving apparatus 100 can detect a change in the modulation parameter of the upper layer modulated wave and use this as a trigger to start rescanning. This makes it possible to start rescanning more favorably.

<Rescan by detection of modulated wave level rise>
In the description of FIG. 17 above, a change in the injection level is detected in step S30002, and this is used as a trigger to start rescanning. On the other hand, as another modification of the "rescan start trigger", the need for rescan may be determined by detecting an increase in the level of the modulated wave received by the broadcast receiving apparatus 100. FIG. The modulated wave received by broadcast receiving apparatus 100 rises as the modulated wave level output transmitted from radio tower 30300 is increased. Alternatively, even if the transmission environment between the radio tower 30300 and the broadcast receiving apparatus 100 is improved, it may increase.

FIG. 18 shows an example of the modulated wave before and after the rise when the modulated wave level rises. FIG. 18(1) is the same modulated wave as FIG. 14(1). FIG. 18(2) shows a modulated wave when only the modulated wave level is increased without changing the modulation parameter or the injection level. The upper hierarchical modulated wave 30110 is changed to the upper hierarchical modulated wave 30710 by increasing the modulated wave level. The modulated wave level of the lower hierarchical modulated wave 30120 is raised to become the lower hierarchical modulated wave 30720 . In addition, the lower hierarchical modulated wave C/N30122 is increased to become the lower hierarchical modulated wave C/N30722. On the other hand, the upper hierarchical modulated wave required C/N 30111 and the lower hierarchical modulated wave required C/N 30121 do not change. In principle, the injection level 30112, which is a value indicating the difference in signal level in relative ratio (dB), also does not change.

FIG. 18(3) shows the modulated waves received by the broadcast receiving apparatus 30102, and the modulated waves are the same as those in FIG. 14(5). As described above, in the state of FIG. 14(5), the lower hierarchical modulated wave C/N 30522 is smaller than the lower hierarchical modulated wave required C/N 30121, and the broadcast receiver 30102 receives the lower hierarchical modulated wave 4K broadcast programs transmitted by 30520 cannot be received and displayed.

FIG. 18(4) shows a modulated wave received by broadcast receiving apparatus 30102 when the modulated wave shown in FIG. 18(2) with a higher modulated wave level is transmitted. The upper hierarchical modulated wave 30810 and the lower hierarchical modulated wave 30820 have higher modulated wave levels than the upper hierarchical modulated wave 30510 and the lower hierarchical modulated wave 30520 in FIG. 18(3), respectively. Although the injection level 30112 does not change in principle, the lower hierarchical modulated wave C/N 30822 increases more than the lower hierarchical modulated wave C/N 30522 in FIG. 18(3). In the example of FIG. 18(4), the lower hierarchical modulated wave C/N 30822 is larger than the lower hierarchical modulated wave required C/N 30121. That is, in the example of FIG. 18 (4), the broadcast receiving device 30102 is in a state where the 4K broadcast program transmitted by the lower layer modulated wave 30520 cannot be received and displayed, and is transmitted by the lower layer modulated wave 30820. This indicates that a 4K broadcast program has been received and has transitioned to a state in which it can be displayed. In this state, the broadcast receiving device 30102 can newly display a 4K broadcast program by rescanning. Therefore, the state transition may be detected and used as a trigger to start rescanning.

Specifically, instead of detecting a change in the injection level in processing S30002 of FIG. It should be a trigger to start. In order to perform the detection, the broadcast receiving apparatus 100 needs to grasp both the lower hierarchical modulated wave C/N30822 and the lower hierarchical modulated wave required C/N30121.

First, since the lower layer modulated wave C/N 30822 cannot be directly detected, the lower layer modulated wave C/N 30822 is calculated using other detectable values. An example of a method of calculating the lower layer modulated wave C/N 30822 will be described below. First, the upper hierarchical modulated wave C/N 30832 is detected in the third tuner/demodulator 130L. Since the upper hierarchical modulated wave C/N 30832 is the difference between the modulated wave level of the upper hierarchical modulated wave 30810 and the noise floor 30000, it is equal to the sum of the injection level 30112 and the lower hierarchical modulated wave C/N 30822. Therefore, by subtracting the injection level 30112 from the detected upper hierarchical modulated wave C/N 30832, the lower hierarchical modulated wave C/N 30822 can be calculated.

Next, the lower hierarchical modulated wave required C/N 30121 cannot be obtained directly. Therefore, for example, if the lower hierarchical modulated wave required C/N 30121 required for transmitting a 4K broadcast program is assumed in advance and stored in the non-volatile memory of the ROM 103 in the broadcast receiving apparatus 100 or in the various information storage area 1019 good.

In addition, as another example of acquiring the lower layer modulated wave required C/N 30121, the lower layer modulated wave required C/N 30121 may be transmitted and the broadcast receiving apparatus 100 may acquire this. At this time, the lower layer modulated wave required C/N 30121 is not directly transmitted, but the modulation parameter of the lower layer modulated wave is transmitted, and based on the modulation parameter acquired in the broadcast receiving apparatus 100, the lower layer modulated wave required C/N 30121 can be derived. In this case, the broadcast receiving apparatus 100 may derive the required lower layer modulated wave C/N 30121 using a calculation formula or lookup table provided in advance and the acquired modulation parameters.

Then, the lower layer modulated wave required C/N 30121 obtained or stored in advance in the non-volatile memory of the ROM 103 or the various information storage area 1019 in this way, and the lower layer modulated wave C/N 30822 calculated in the above calculation process , and it is sufficient to detect that the lower hierarchical modulated wave C/N 30822 has become larger than the lower hierarchical modulated wave required C/N 30121.

According to the example described with reference to FIG. 18, it is possible to detect an increase in the modulated wave level received by the broadcast receiving apparatus 100 and use this as a trigger to start rescanning. This makes it possible to start rescanning more favorably.

<Rescan by detection of 4K broadcast>
Further, as another modification of the determination method in the process S30002 of FIG. 17, regardless of whether the injection level is changed or not, when the 4K service list does not exist, the third tuner/demodulator 130L intermittently performs lower layer hierarchical modulation. The wave reception processing may be repeated, and the need for rescanning may be determined based on whether or not the lower hierarchical modulated wave can be received. If the reception of the lower layer modulated wave is confirmed, it is determined that the broadcast receiving apparatus 100 is newly included in the receivable range, the process proceeds to step S30004, and waits until rescanning is possible. The intermittently repeated lower-layer modulated wave reception process may be performed periodically, such as every other day, or may be performed under non-periodic conditions.

<Rescan based on modification date information or modification time information>
As another modification of the determination method in processing S30002 of FIG. time) is reached, rescanning may be performed. This is also another modification of the "rescan start trigger". First, the injection level change date is stored in TMCC information and/or AC information and transmitted. For example, injection level change date information (or injection level change time information including injection level change date information) may be transmitted using the undefined area of the transmission parameter additional information shown in FIG. The transmitted information is acquired by the third tuner/demodulator 130L of the broadcast receiving apparatus 100. FIG. Broadcast receiving apparatus 100 may determine that rescanning is necessary when the current date (or current time) managed by current time information or the like reaches the injection level change deadline (or injection level change time). If the process determines that rescanning is necessary, the process S30004 may be started.

As described above, by comparing the injection level change date acquired by the broadcast receiving device 100 with the current date, the fact that the current date has reached the injection level change date can be used as a trigger to start rescanning. Alternatively, by comparing the injection level change time acquired by the broadcast receiving apparatus 100 with the current time, the arrival of the current time at the injection level change time can be used as a trigger to start rescanning. This makes it possible to start rescanning more favorably.

Broadcast receiving apparatus 100 may acquire the current date and current time from MH-TOT or the like transmitted by broadcast waves.

In this way, the injection level change date or the injection level change time can be used as a trigger to start rescanning. Thereby, the broadcast receiving apparatus 100 can grasp the injection level change date or the injection level change time in advance, and can start rescanning more preferably.

<Inquiry display to user whether rescanning can be started>
As a modification of the process S30004 in FIG. 17, it is possible to change the process to immediately notify the user of the necessity of rescanning without waiting for the rescanning possible state. Specifically, instead of entering the standby state in step S30004, a display explaining the possibility of receiving a 4K broadcast program and the necessity of rescanning is displayed. This may allow the user to select whether or not to start rescanning. If the user selects to start rescanning, the rescanning process is started immediately. If the user does not select to start rescanning, the process returns to the rescanable state waiting process S30004.

In this way, the result of the user's selection in response to an inquiry about whether to start rescanning presented to the user can be used as a trigger for starting rescanning. As a result, it is possible to start rescanning more appropriately, reflecting the convenience of the user.

Although examples of embodiments of the present invention have been described above using Examples 1 and 2, the configuration for realizing the technology of the present invention is not limited to the above-described examples, and various modifications are conceivable. For example, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. All these belong to the scope of the present invention. Numerical values, messages, and the like appearing in the sentences and drawings are merely examples, and the effects of the present invention are not impaired even if different ones are used.

Some or all of the above-described functions and the like of the present invention may be realized by hardware by designing them in an integrated circuit, for example. Alternatively, the functions may be realized by software, in which the microprocessor unit or the like interprets and executes an operation program for realizing each function. Hardware and software may be used together.

The software for controlling the broadcast receiving device 100 may be stored in advance in the ROM 103 and/or the storage unit 110 of the broadcast receiving device 100 at the time of product shipment. It may be obtained from another application server 500 or the like on the Internet 200 via the LAN communication unit 121 after product shipment. Also, the software stored in a memory card, an optical disc, or the like may be acquired via the expansion interface section 124 or the like. Similarly, the software for controlling mobile information terminal 700 may be stored in ROM 703 and/or storage unit 710 of mobile information terminal 700 in advance at the time of product shipment. It may be acquired from other application servers 500 or the like on the Internet 200 via the LAN communication section 721 or the mobile telephone network communication section 722 or the like after product shipment. Also, the software stored in a memory card, an optical disc, or the like may be acquired via the expansion interface section 724 or the like.

Also, the control lines and information lines shown in the drawings are those considered necessary for explanation, and do not necessarily show all the control lines and information lines on the product. In fact, it may be considered that almost all configurations are interconnected.

100: broadcast receiver, 101: main control unit, 102: system bus, 103: ROM, 104: RAM, 110: storage (accumulation) unit, 121: LAN communication unit, 124: expansion interface unit, 125: digital interface unit , 130C, 130T, 130L, 130B: tuner/demodulation unit, 140S, 140U: decoder unit, 180: operation input unit, 191: video selection unit, 192: monitor unit, 193: video output unit, 194: audio selection unit, 195: speaker section, 196: audio output section, 180R: remote controller, 200, 200T, 200L, 200B: antenna, 300, 300T, 300L: radio tower, 400C: head end of cable television station, 400: broadcasting station server, 500 : service provider server, 600: mobile phone communication server, 600B: base station, 700: portable information terminal, 800: Internet, 800R: router device.

Claims (2)

A method of transmitting a digital broadcast modulated wave in a digital broadcast system,
a transmission step of transmitting a composite wave obtained by combining an upper layer modulated wave and a lower layer modulated wave with different transmission powers in the same frequency band;
an information transmitting step of transmitting information related to a date and time for changing the difference in transmission power between the upper hierarchical modulated wave and the lower hierarchical modulated wave in either the upper hierarchical modulated wave or the lower hierarchical modulated wave; and,
a transmission power changing step of changing a difference in transmission power between the upper layer modulated wave and the lower layer modulated wave;
A transmission method for digital broadcast modulated waves. In the method for transmitting a digital broadcast modulated wave according to claim 1,
Information on the date and time for changing the transmission power difference between the upper hierarchical modulated wave and the lower hierarchical modulated wave is the TMCC of the digital broadcasting signal transmitted by the upper hierarchical modulated wave or the lower hierarchical modulated wave. contained in a signal or AC signal,
A transmission method for digital broadcast modulated waves.

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