JP2022191436A - Content protection processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver that can execute a higher value-added function.

SOLUTION: A digital broadcast receiver comprises: a receiving unit that receives video data, program cooperation data and screen layout control information of a digital broadcast program; a video generation unit that divides a video display area of a video to be output into a plurality of areas on the basis of the screen layout control information and can generate video information in which the plurality of areas are synthesized; a display unit that displays output video information; and a control unit. The receiving unit receives first screen layout control information that can be commonly used in a plurality of digital broadcast programs of a broadcast channel. The control unit controls a video generation unit to divide the plurality of digital broadcast programs of the broadcast channel into a plurality of areas on the basis of the first screen layout control information, to arrange any of program video information, character information, graphic information or video information on each of the plurality of areas, and to generate the video information in which the plurality of areas is synthesized.

SELECTED DRAWING: Figure 7A

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to broadcast reception technology and output video information generation technology.

One of the extended functions of the digital broadcasting service is data broadcasting that transmits digital data by broadcast waves and displays various information such as weather forecasts, news, and recommended programs. A large number of television receivers capable of receiving data broadcasting are already on the market, and a large number of technologies related to data broadcasting reception, including the following patent document 1, have been published.

JP-A-2001-186486

In response to recent changes in content distribution environment, television receivers are also required to have various functional extensions. In particular, there are many requests for distribution of content and cooperative applications using a broadband network environment such as the Internet, requests for higher resolution/higher definition of video content, and the like. However, it is difficult to provide a high-value-added television receiver that can meet the above-mentioned demands by using only the data broadcasting reception function, etc., of the current television receiver, or by only expanding the function, such as the data broadcasting reception function. .

SUMMARY OF THE INVENTION An object of the present invention is to realize a content protection processing method capable of executing functions with higher added value.

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

By using the technology of the present invention, it is possible to realize a content protection processing method capable of executing functions with higher added value.

1 is a system configuration diagram showing an example of a broadcast communication system including a broadcast receiver according to a first embodiment; FIG. FIG. 2 is an explanatory diagram of an outline of a coded signal in MMT; It is a block diagram of MPU in MMT. FIG. 4 is a configuration diagram of an MMTP packet in MMT; 1 is a conceptual diagram of a protocol stack of a broadcasting system using MMT; FIG. 2 is a hierarchical configuration diagram of control information used in a broadcasting system; FIG. It is a list of tables used in TLV-SI of the broadcasting system. It is a list of descriptors used in TLV-SI of the broadcasting system. 1 is a list of messages used in MMT-SI of the broadcasting system; 1 is a list of tables used in MMT-SI for broadcasting systems; 1 is a list (part 1) of descriptors used in MMT-SI of a broadcasting system; 2 is a list of descriptors used in MMT-SI of the broadcasting system (part 2); FIG. 3 is a diagram showing data transmission in the broadcasting system and the relationship between each table; 1 is a block diagram of a broadcast receiving device according to a first embodiment; FIG. 4 is a configuration diagram of a logical plane structure of the presentation function of the broadcast receiving device according to Example 1; FIG. 2 is a system configuration diagram of clock synchronization/presentation synchronization of the broadcast receiver according to the first embodiment; FIG. 3 is a software configuration diagram of the broadcast receiving device according to the first embodiment; FIG. 2 is a block diagram of a broadcasting station server according to the first embodiment; FIG. 3 is a block diagram of a service provider server according to the first embodiment; FIG. 1 is a block diagram of a mobile information terminal according to Example 1; FIG. 2 is a software configuration diagram of the portable information terminal according to the first embodiment; FIG. FIG. 3 is a diagram showing the data structure of MH-TOT in the broadcasting system; FIG. 10 is a diagram showing the format of the JST_time parameter of the broadcasting system; FIG. 5 is a diagram showing a method of calculating the current date from the MJD of the broadcast receiving device according to the first embodiment; FIG. 2 is a diagram showing the configuration of the NTP format of the broadcasting system; Fig. 2 shows the data structure of the MPU Timestamp Descriptor of the broadcast system; FIG. 4 is a diagram showing the data structure of time information in the TMCC extension information area of the broadcasting system; 4 is an operation sequence diagram during channel scanning of the broadcast receiving apparatus according to the first embodiment; FIG. FIG. 4 is a diagram showing the data structure of TLV-NIT in the broadcasting system; Fig. 2 shows the data structure of the Satellite Distribution System Descriptor of the Broadcast System; Fig. 2 shows the data structure of a service list descriptor of a broadcasting system; FIG. 2 is a diagram showing the data structure of AMT in the broadcasting system; FIG. 4 is an operation sequence diagram of the broadcast receiving apparatus according to the first embodiment when selecting a channel; It is a figure which shows the data structure of MPT of a broadcasting system. FIG. 3 is a diagram showing the data structure of LCT in the broadcasting system; FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on LCT; FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on LCT; FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on LCT; FIG. 10 is a diagram showing an example of allocation of layouts to layout numbers based on LCT; FIG. 10 is a diagram for explaining the operation of exception processing of screen layout control based on LCT; FIG. 10 is a diagram for explaining the operation of exception processing of screen layout control based on LCT; FIG. 3 is a diagram showing the data structure of MH-EIT in the broadcasting system; 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment; FIG. 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment; FIG. 4 is a screen display diagram of an EPG screen of the broadcast receiving device according to the first embodiment; FIG. FIG. 10 is a screen display diagram of the broadcast receiving apparatus according to the first embodiment when an emergency warning broadcast is displayed; FIG. 11 is a block diagram of a broadcast receiving apparatus according to Example 2; FIG. 10 is a diagram for explaining inconsistency of the current time display when switching broadcasting services; FIG. 11 is a diagram illustrating operation of selection control of a current time information reference source according to the second embodiment; FIG. 11 is an operation sequence diagram of current time information update processing according to the second embodiment; FIG. 11 is a screen display diagram of an EPG screen of the broadcast receiving device according to the second embodiment; FIG. 11 is a screen display diagram of an EPG screen of the broadcast receiving device according to the second embodiment; 2 is a structural diagram of program data; FIG. 4 is a structural diagram of asset data; FIG. It is a figure which shows the data structure of a PA message. FIG. 10 is a diagram showing the data structure of MMT_general_location_info; It is a figure which shows the data structure of PLT. It is a figure which shows the meaning of a location type. FIG. 10 is a diagram showing the data structure of an MPU presentation area specification descriptor; FIG. 11 is a diagram for explaining a presentation operation according to Example 3; FIG. 11 is a diagram for explaining a presentation operation according to Example 3; FIG. 10 illustrates the data structure of an LCT Expiration Descriptor; FIG. 10 is a diagram illustrating the data structure of a layout validity period descriptor; FIG. 10 illustrates the data structure of a presentation area expiration descriptor; FIG. 10 is a diagram showing the data structure of a common presentation area information descriptor; It is a figure which shows the meaning of full_set_flag. FIG. 10 is a diagram showing the data structure of an overlapping presentation area specification descriptor; FIG. 11 is a diagram for explaining a presentation operation according to Example 3; FIG. 11 is a diagram for explaining a presentation operation according to Example 3; FIG. 10 is a diagram showing the data structure of a dependency descriptor; FIG. 11 is a diagram for explaining a presentation operation according to Example 3; FIG. 10 is a diagram showing a data structure of a modification of the dependency descriptor; It is a figure which shows the meaning of dependency_type. FIG. 11 is a diagram for explaining a presentation operation according to Example 3;

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 a broadcast communication system including a broadcast receiver of this embodiment. The broadcast communication system of this embodiment includes a broadcast receiver 100 and an antenna 100a, a broadband network such as the Internet 200, a router device 200r and an access point 200a, a broadcast station radio tower 300t and a broadcast satellite (or communication satellite) 300s, and a broadcast station. It consists of a server 300, a service provider server 400, other application servers 500, a mobile phone communication server 600, a mobile phone communication network base station 600b, and a mobile information terminal 700. FIG.

The broadcast receiving apparatus 100 receives broadcast waves transmitted from a radio tower 300t via a broadcasting satellite (or communication satellite) 300s and an antenna 100a. Alternatively, broadcast waves transmitted from the radio tower 300t may be received directly from the antenna 100a without passing through the broadcasting satellite (or communication satellite) 300s. Also, the broadcast receiving device 100 can be connected to the Internet 200 via the router device 200r, and can transmit and receive data through communication with each server device on the Internet 200 and other communication devices.

The router device 200r is connected to the Internet 200 by wire communication, is connected to the broadcast receiving device 100 by wire communication or wireless communication, and is connected to the portable information terminal 700 by wireless communication. A method such as Wi-Fi (registered trademark) may be used for the wireless communication. This enables each server device and other communication devices on the Internet 200, the broadcast receiving device 100, and the mobile information terminal 700 to mutually transmit and receive data via the router device 200r. 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 200r.

The radio tower 300t is broadcasting equipment of a broadcasting station, and transmits broadcasting waves including encoded data of broadcast programs, caption information, other applications, general-purpose data, and the like. The broadcasting satellite (or communication satellite) 300s receives the broadcast wave transmitted from the radio tower 300t of the broadcasting station, performs frequency conversion etc. as appropriate, and then transmits the broadcast to the antenna 100a connected to the broadcast receiving device 100. A repeater that retransmits waves. Also, the broadcasting station is assumed to have a broadcasting station server 300 . The broadcasting station server 300 stores broadcast programs (video content, etc.) and metadata such as program titles, program IDs, program summaries, performer information, broadcast dates, etc. of each broadcast program, and stores the video content and each metadata. , based on the contract, it shall be possible to provide to the service provider. The video content and each metadata may be provided to the service provider through an API (Application Programming Interface) of the broadcasting station server 300 .

The service provider server 400 is a server device prepared by a service provider, and is capable of providing various services in cooperation with broadcast programs distributed from broadcast stations. In addition, the service provider server 400 stores, manages, distributes, and so forth video content and metadata provided by the broadcast station server 300, and various content and applications linked to broadcast programs. In addition, in response to an inquiry from a television receiver or the like, it is assumed to have a function of searching for contents, applications, etc. that can be provided, and providing a list. Note that the storage, management, and distribution of the content and metadata and the storage, management, and distribution of the application may be performed by different server devices. The broadcasting station and the service provider may be the same or different. A plurality of service provider servers 400 may be prepared for different services. Also, the functions of the service provider server 400 may be provided by the broadcasting station server 300 .

The other application server 500 is a known server device that stores, manages, and distributes other general applications, operating programs, contents, data, and the like. A plurality of other application servers 500 may exist on the Internet 200 .

The mobile telephone communication server 600 is connected to the Internet 200, and is also connected to the mobile information terminal 700 via the base station 600b. The mobile phone communication server 600 manages telephone communication (call) and data transmission/reception via the mobile phone communication network of the mobile information terminal 700, and each server device and other communication devices on the mobile information terminal 700 and the Internet 200. It is possible to send and receive data by communicating with The communication between the base station 600b and the mobile information terminal 700 is based on the W-CDMA (Wideband Code Division Multiple Access) (registered trademark) method, the GSM (Global System for Mobile communications) (registered trademark) method, or the LTE (Long Term Evolution) method. , or by other communication methods.

The portable information terminal 700 is assumed to have a function of telephone communication (phone call) and data transmission/reception via a mobile phone communication network, and a function of wireless communication such as Wi-Fi (registered trademark). The mobile information terminal 700 can be connected to the Internet 200 via the router device 200r or the access point 200a, or via the base station 600b of the mobile telephone communication network and the mobile telephone communication server 600. It is possible to transmit and receive data through communication with each server device and other communication devices. The access point 200a is connected to the Internet 200 by wire communication, and is connected to the portable information terminal 700 by wireless communication. A method such as Wi-Fi (registered trademark) may be used for the wireless communication. Communication between the portable information terminal 700 and the broadcast receiving device 100 is performed via the access point 200a, the Internet 200, and the router device 200r, or via the base station 600b, the mobile telephone communication server 600, the Internet 200, and the router device 200r. It may be performed through

[Outline of MMT method]
Broadcast receiving apparatus 100 shown in FIG. 1 is defined by MPEG (Moving Picture Experts Group)-2 system, which is widely used in conventional digital broadcasting systems, as a media transport method for transmitting data such as video and audio. It is assumed that the television receiver is compatible with MMT (MPEG Media Transport) in place of TS (Transport Stream) (hereinafter referred to as MPEG2-TS). A television receiver compatible with both MPEG2-TS and MMT may be used.

MPEG2-TS is characterized by multiplexing components such as video and audio that make up a program into one stream together with control signals and clocks. Since it handles a single stream including the clock, it is suitable for transmitting a single content over a single transmission line with a guaranteed transmission quality, and has been adopted in many conventional digital broadcasting systems. On the other hand, MPEG2-TS functions in response to environmental changes related to content distribution, such as the recent 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. MMT is a newly developed media transport scheme due to the limitations of .

FIG. 2A shows an example of an outline of a coded signal in MMT of this embodiment. As shown in the figure, the MMT of this embodiment has an MFU (Media Fragment Unit), an MPU (Media Processing Unit), an MMTP (MMT Protocol) payload, and an MMTP packet as elements constituting an encoded signal. and The MFU is a format for transmitting video, audio, and the like, and may be configured in NAL (Network Abstraction Layer) unit units or access unit units. The MPU may consist of MPU metadata containing information about the overall structure of the MPU, movie fragment metadata containing information about the encoded media data, and sample data which is the encoded media data. It is also assumed that the MFU can be extracted from the sample data. In the case of media such as video components and audio components, presentation time and decoding time may be specified for each MPU or each access unit. FIG. 2B shows an example of the configuration of the MPU.

An MMTP packet is composed of a header portion and an MMTP payload, and shall transmit MFU and MMT control information. The MMTP payload is assumed to have a payload header corresponding to the content (data unit) stored in the payload section. FIG. 2C shows an example of an overview of constructing an MFU from a video/audio signal, storing it in an MMTP payload, and constructing an MMTP packet. Note that in a video signal encoded using inter-frame prediction, it is desirable to configure the MPU in GOP (Group Of Pictures) units. Also, when the size of the MFU to be transmitted is small, one MFU may be stored in one payload section, or a plurality of MFUs may be stored in one payload section. Also, when the size of the MFU to be transmitted is large, one MFU may be divided into a plurality of payload parts and stored. Also, MMTP packets may be protected using techniques such as AL-FEC (Application Layer Forward Error Correction) and ARQ (Automatic Repeat Request) in order to recover from packet loss on the transmission path.

In the broadcasting system of this embodiment, MPEG-H HEVC (High Efficiency Video Coding) is used as a video coding method, and MPEG-4 AAC (Advanced Audio Coding) or MPEG-4 ALS (Audio Lossless Video Coding) is used as an audio coding method. Coding) shall be used. Encoded data such as video and audio of a broadcast program encoded by each of the above methods is in the form of MFU or MPU, further put on the MMTP payload to be MMTP packetized, and transmitted by IP (Internet Protocol) packet. and Also, data contents related to broadcast programs may be in the form of MFU or MPU, put on an MMTP payload, converted into MMTP packets, and transmitted in IP packets. Data content transmission methods include closed caption/text superimposition transmission method used for data streaming synchronized with broadcasting, application transmission method used for data transmission asynchronous to broadcasting, and synchronous/asynchronous message transmission for applications running on television receivers. Four types are prepared: an event message transmission method used for notification, and a general-purpose data transmission method for transmitting other general-purpose data in a synchronous/asynchronous manner.

For the transmission of MMTP packets, it is assumed that UDP/IP (User Datagram Protocol/Internet Protocol) is used on the broadcast transmission line, and UDP/IP or TCP/IP (Transmission Control Protocol/Internet Protocol) is used on the communication line. . It is also assumed that a TLV (Type Length Value) multiplexing method is used for efficient transmission of IP packets on the broadcast transmission path. An example of the protocol stack of the broadcasting system of this embodiment is shown in FIG. In the figure, (A) is an example of a protocol stack in a broadcast transmission line, and (B) is an example of a protocol stack in a communication line.

In the broadcasting system of this embodiment, a mechanism for transmitting two types of control information, MMT-SI (MMT-Signaling Information) and TLV-SI (TLV-Signaling Information), is prepared. MMT-SI is control information indicating the structure of a broadcast program. It is assumed to be in the form of an MMT control message, put on an MMTP payload, form an MMTP packet, and be 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.

Also, in a broadcasting system using MMT, time information is transmitted in order to provide absolute time. While MPEG2-TS indicates the component display time based on a different clock for each TS, MMT indicates the component display time based on Coordinated Universal Time (UTC). do. These mechanisms enable terminal devices to synchronously display components transmitted from different transmission points through different transmission paths. It is assumed that NTP (Network Time Protocol) format IP packets are used to provide UTC.

[Control information for broadcasting system using MMT]
In the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment corresponds, as described above, the control information includes TLV-SI related to the TLV multiplexing method for multiplexing IP packets and MMT, which is the media transport method. Prepare the relevant MMT-SI. The TLV-SI provides information for the broadcast receiving apparatus 100 to demultiplex the IP packets multiplexed on the broadcast transmission path. TLV-SI consists of a "table" and a "descriptor". The "table" shall be transmitted in the form of sections, and the "descriptor" shall be placed within the "table". MMT-SI is transmission control information indicating information related to the configuration of MMT packages and broadcasting services. MMT-SI consists of three layers: "messages" that store "tables" and "descriptors", "tables" that have elements and attributes that indicate specific information, and "descriptors" that indicate more detailed information. shall be FIG. 4 shows an example of the hierarchical structure of control information used in the broadcasting system of this embodiment.

<Tables used in TLV-SI>
FIG. 5A shows a list of "tables" used in the TLV-SI of the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment is compatible. In this embodiment, the following table is used as the TLV-SI "table".

(1) TLV-NIT
The Network Information Table for TLV (TLV-NIT) represents information about the physical structure of the TLV stream transmitted by the network and the characteristics of the network itself.

(2) AMT
An Address Map Table (AMT) provides a list of multicast groups of IP packets that constitute each service carried in the network.

(3) Table set by business operator In addition, it is possible to prepare a table that is uniquely set by a service business operator or the like.

<Descriptor used in TLV-SI>
FIG. 5B shows a list of "descriptors" arranged in the TLV-SI of the broadcasting system supported by the broadcast receiving apparatus 100 of this embodiment. In this embodiment, the following is used as the "descriptor" of TLV-SI.

(1) Service List Descriptor The service list descriptor provides a list of services by service identifier and service type.

(2) Satellite distribution system descriptor The satellite distribution system descriptor indicates the physical conditions of the satellite transmission path.

(3) System Management Descriptor The system management descriptor is used to distinguish between broadcasting and non-broadcasting.

(4) Network name descriptor The network name descriptor describes the network name using character codes.

(5) Descriptors set by service providers In addition, descriptors set independently by service providers can be prepared.

<Messages used in MMT-SI>
FIG. 6A shows a list of "messages" used in MMT-SI of the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment is compatible. In this embodiment, the following is used as the "message" of MMT-SI.

(1) PA message Package Access (PA) message is used to transmit various tables.

(2) M2 section message The M2 section message is used to transmit the section extension format of MPEG-2 Systems.

(3) CA message The CA message is used to transmit a table for identifying the conditional access system.

(4) M2 Short Section Message The M2 short section message is used to transmit the section short format of MPEG-2 Systems.

(5) Data transmission message A data transmission message is a message that stores a table related to data transmission.

(6) Messages set by service providers In addition, it is possible to prepare messages set independently by service providers.

<Tables used in MMT-SI>
FIG. 6B shows a list of "tables" used in MMT-SI of the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment is compatible. The table is control information having elements and attributes indicating specific information, and is stored in a message and transmitted by an MMTP packet. Note that the message that stores the table may be determined according to the table. In this embodiment, the following MMT-SI "table" is used.

(1) MPT
The MMT Package Table (MPT) provides the information that makes up a package, such as the list of assets and the location of the assets on the network. MPT can be stored in the PA message.

(2) PLTs
The Package List Table (PLT) shows a list of IP data flows and packet IDs that transmit PA messages of MMT packages provided as broadcast services, and IP data flows that transmit IP services. PLT can be stored in the PA message.

(3) LCT
A layout configuration table (LCT) is used to associate layout information for presentation with a layout number. The LCT can be stored in the PA message.

(4) ECM
Entitlement Control Message (ECM) is common information consisting of program information and control information, and delivers key information for descrambling. The ECM can be stored in the M2 section message.

(5) EMMs
Entitlement Management Message (EMM) transmits individual information including contract information for each subscriber and key information for decrypting ECM (common information). EMMs can be stored in M2 section messages.

(6) CAT (MH)
A CA table (Conditional Access Table: CAT) (MH) is used to store descriptors for identifying conditional access systems. CAT(MH) can be stored in the CA message.

(7) DCM
A Download Control Message (DCM) transmits key-related information such as a key for decrypting transmission path encryption for download. DCMs can be stored in M2 section messages.

(8) DMM
A Download Management Message (DMM) transmits key-related information such as a download key for decrypting the DCM. DMMs can be stored in M2 section messages.

(9) MH-EIT
The MH-Event Information Table (MH-EIT) is chronological information on events included in each service. MH-EIT can be stored in the M2 section message.

(10) MH-AIT
The MH-Application Information Table (MH-AIT) stores all information related to the application, the activation state required for the application, and the like. MH-AIT can be stored in the M2 section message.

(11) MH-BIT
The MH-Broadcaster Information Table (MH-BIT) is used to present information of broadcasters present on the network. MH-BIT can be stored in the M2 section message.

(12) MH-SDTT
The MH-Software Download Trigger Table (MH-SDTT) is used for download notification information. MH-SDTT can be stored in the M2 section message.

(13) MH-SDT
The MH-Service Description Table (MH-SDT) has sub-tables representing services included in a particular TLV stream, and contains information about organized channels such as the name of the organized channel and the name of the broadcaster. to transmit. MH-SDT can be stored in the M2 section message.

(14) MH-TOT
The MH-Time Offset Table (MH-TOT) carries JST time and date (Modified Julian Day) information. MH-TOT can be stored in the M2 short section message.

(15) MH-CDT
The MH-Common Data Table (MH-CDT) is used to transmit common data to be stored in non-volatile memory in section format to all receivers that receive it. MH-CDT can be stored in the M2 section message.

(16) DDM Table A Data Directory Management Table (DDM table) provides a directory structure of files that constitute an application in order to separate the file structure of the application and the structure for file transmission. DDM tables can be stored in data transmission messages.

(17) DAM Table A Data Asset Management Table (DAM table) provides configuration of MPUs in an asset and version information for each MPU. DAM tables can be stored in data transfer messages.

(18) DCC Table A data content configuration table (DCC table) provides configuration information of files as data content in order to realize flexible and effective cache control. A DCC table can be stored in a data transmission message.

(19) EMTs
An event message table (EMT) is used to transmit information about event messages. The EMT can be stored in the M2 section message.

(20) Table set by business operator In addition, it is possible to prepare a table uniquely set by a service business operator or the like.

<Descriptor used in MMT-SI>
6C and 6D show a list of "descriptors" arranged in the MMT-SI of the broadcasting system supported by the broadcast receiving apparatus 100 of this embodiment. A descriptor is control information that provides more detailed information and shall be placed in a table. Note that the table in which descriptors are arranged may be determined according to the descriptors. In this embodiment, the following are used as the "descriptor" of MMT-SI.

(1) Asset Group Descriptor The asset group descriptor provides the group relationship of assets and their priority within the group. Asset group descriptors can be placed in the MPT.

(2) Event Package Descriptor The event package descriptor provides correspondence between events representing programs and packages. The event package descriptor can be placed in the MH-EIT carried in the M2 section message.

(3) Background Color Specification Descriptor The background color specification descriptor provides the backmost background color in layout specification. A background color specification descriptor may be placed in the LCT.

(4) MPU Presentation Area Specification Descriptor The MPU Presentation Area Specification Descriptor provides the location where the MPU is presented. MPU presentation area specification descriptors may be placed in the MPT.

(5) MPU Timestamp Descriptor The MPU Timestamp Descriptor indicates the presentation time of the first access unit in presentation order in the MPU. The MPU Timestamp Descriptor can be placed in the MPT.

(6) Dependency Descriptor The Dependency Descriptor provides the Asset ID of the dependent Asset. Dependency descriptors can be placed in the MPT.

(7) Access control descriptor The access control descriptor provides information for identifying the conditional access system. Access control descriptors may be located in the MPT or CAT (MH).

(8) Scrambling scheme descriptor The scrambling scheme descriptor provides information for identifying the type of encryption target and encryption algorithm during scrambling. The scrambling scheme descriptor may be placed in MPT or CAT (MH).

(9) Message Authentication Method Descriptor The message authentication method descriptor provides information for identifying the message authentication method when performing message authentication. The Message Authentication Scheme Descriptor may be placed in the MPT or CAT (MH).

(10) Emergency Information Descriptor (MH)
An emergency information descriptor (MH) is used when an emergency warning is broadcast. An emergency information descriptor (MH) may be placed in the MPT.

(11) MH-MPEG-4 audio descriptor The MH-MPEG-4 audio descriptor describes basic information for specifying the encoding parameters of the audio stream of ISO/IEC 14496-3 (MPEG-4 audio). used for MH-MPEG-4 audio descriptors can be placed in the MPT.

(12) MH-MPEG-4 Audio Extension Descriptor The MH-MPEG-4 Audio Extension Descriptor is used to describe MPEG-4 audio stream profiles, levels, and coding system-specific settings. MH-MPEG-4 audio extension descriptors can be placed in the MPT.

(13) MH-HEVC Video Descriptor The MH-HEVC video descriptor conforms to ITU-T Recommendation H.264. H.265|Used to describe the basic encoding parameters of a video stream (HEVC stream) of ISO/IEC 23008-2. MH-HEVC video descriptors can be placed in the MPT.

(14) MH-Link Descriptor The MH-Link descriptor identifies the service to be provided when the viewer requests additional information related to a particular thing listed in the service information system. MH-Link descriptors may be located in MPT, MH-EIT, MH-SDT, and so on.

(15) MH-Event Group Descriptor MH-Event Group Descriptor is used to indicate that events are grouped when there is a relationship between multiple events. The MH-Event Group Descriptor may be placed in the MH-EIT.

(16) MH-Service List Descriptor MH-Service List Descriptor provides a list of services by service identification and service type type. The MH-Service List Descriptor may be placed in the MH-BIT.

(17) MH-Short Event Descriptor The MH-Short Event Descriptor represents the event name and a short description of the event in text form. The MH-Short Event Descriptor may be placed in the MH-EIT.

(18) MH-Extended Event Descriptor The MH-Extended Event Descriptor is used in addition to the MH-Short Event Descriptor to provide a detailed description of the event. The MH-extended event descriptor can be placed in the MH-EIT.

(19) Video Component Descriptor The video component descriptor indicates parameters and descriptions related to the video component, and is also used to represent the elementary stream in character format. Video component descriptors may be placed in the MPT or MH-EIT.

(20) MH-Stream Identifier Descriptor MH-Stream Identifier Descriptor is used to label component streams of a service and to refer to the description content indicated by the video component descriptor in MH-EIT by this label. . An MH-stream identifier descriptor can be placed in the MPT.

(21) MH-Content Descriptor MH-Content Descriptor indicates the genre of the event. The MH-Content Descriptor can be placed in the MH-EIT.

(22) MH-Parental Rate Descriptor The MH-Parental Rate Descriptor is used to represent age-based viewing restrictions and to extend based on other restriction conditions. The MH-Parental Rate Descriptor may be placed in the MPT or MH-EIT.

(23) MH-Audio Component Descriptor The MH-Audio Component Descriptor indicates each parameter of the audio elementary stream and is also used to express the elementary stream in character format. MH-Audio Component Descriptor may be located in MPT or MH-EIT.

(24) MH-Target Area Descriptor The MH-Target Area Descriptor is used to describe the target area of a program or part of streams that constitute a program. The MH-Target Area Descriptor can be placed in the MPT.

(25) MH-series descriptor The MH-series descriptor is used to identify series programs. MH-series descriptors may be placed in the MH-EIT.

(26) MH-SI Transmission Parameter Descriptor The MH-SI Transmission Parameter Descriptor is used to indicate SI transmission parameters. The MH-SI Transmission Parameter Descriptor can be placed in the MH-BIT.

(27) MH-Broadcaster Name Descriptor The MH-Broadcaster Name Descriptor describes the name of the broadcaster. The MH-Broadcaster Name Descriptor may be placed in the MH-BIT.

(28) MH-Service Descriptor The MH-service descriptor expresses the program channel name and its carrier name together with the service format type in character code. The MH-Service Descriptor can be placed in the MH-SDT.

(29) IP data flow descriptor The IP data flow descriptor provides information on the IP data flows that make up the service. The IP Data Flow Descriptor can be placed in the MH-SDT.

(30) MH-CA activation descriptor The MH-CA activation descriptor describes activation information for activating the CAS program on the CAS infrastructure. The MH-CA Activation Descriptor may be placed in the MPT or CAT (CA).

(31) MH-Type descriptor The MH-Type descriptor indicates the type of file transmitted by the application transmission method. MH-Type descriptors can be placed in a DAM table.

(32) MH-Info descriptor MH-Info descriptor describes information about MPU or item. MH-Info descriptors can be placed in a DAM table.

(33) MH-Expire descriptor The MH-Expire descriptor describes the expiration date of the item. MH-Expire descriptors can be placed in the DAM table.

(34) MH-Compression Type descriptor The MH-Compression Type descriptor means that the item to be transmitted is compressed, and indicates the compression algorithm and the number of bytes of the item before compression. The MH-Compression Type descriptor can be placed in the DAM table.

(35) MH-Data Encoding Descriptor MH-Data Encoding Descriptor is used to identify the data encoding. The MH-Data Coding Descriptor can be placed in the MPT.

(36) UTC-NPT Reference Descriptor The UTC-NPT reference descriptor is used to convey the relationship between NPT (Normal Play Time) and UTC. The UTC-NPT reference descriptor can be placed in the EMT.

(37) Event message descriptor The event message descriptor conveys information about event messages in general. Event message descriptors can be placed in the EMT.

(38) MH-Local Time Offset Descriptor The MH-Local Time Offset Descriptor is used to give a certain offset value between the actual time (eg, UTC+9 hours) and the display time for the human system when daylight saving time is implemented. The MH-Local Time Offset Descriptor can be placed in the MH-TOT.

(39) MH-Component Group Descriptor The MH-Component Group Descriptor defines and identifies the combination of components within an event. The MH-Component Group Descriptor can be placed in the MH-EIT.

(40) MH-Logo Transmission Descriptor The MH-Logo Transmission Descriptor is used to describe simple logo character strings, pointing to logos in CDT format, and the like. The MH-Logo Transmission Descriptor can be placed in the MH-SDT.

(41) MPU Extended Timestamp Descriptor The MPU Extended Timestamp Descriptor provides the decoding time of the access unit within the MPU. The MPU Extended Timestamp Descriptor can be placed in the MPT.

(42) MPU download content descriptor The MPU download content descriptor is used to describe the attribute information of content downloaded using the MPU. The MPU Download Content Descriptor may be placed in the MH-SDTT.

(43) MH-Network Download Contents Descriptor The MH-Network Downloads Contents Descriptor is used to describe the attribute information of the content downloaded using the network. The MH-Network Download Content Descriptor can be placed in the MH-SDTT.

(44) MH-Application Descriptor MH-Application Descriptor describes application information. The MH-Application Descriptor can be placed in the MH-AIT.

(45) MH-Transmission Protocol Descriptor The MH-transmission protocol descriptor is used to designate transmission protocols such as broadcasting and communication and to indicate location information of applications dependent on the transmission protocols. The MH-Transport Protocol Descriptor can be placed in the MH-AIT.

(46) MH-Simple Application Location Descriptor MH-Simple Application Location Descriptor is written to indicate the details of the acquisition source of the application. The MH-Simple Application Location Descriptor may be placed in the MH-AIT.

(47) MH-Application Boundary Authority Setting Descriptor The MH-Application Boundary Authority Setting Descriptor is used to set the application boundary and set the broadcasting resource access authority for each area (URL). The MH-Application Boundary Authorization Descriptor can be placed in the MH-AIT.

(48) MH-Activation Priority Information Descriptor MH-Activation Priority Information Descriptor is written to specify the activation priority of an application. The MH-Activation Priority Information Descriptor may be placed in the MH-AIT.

(49) MH-Cache Information Descriptor MH-Cache Information Descriptor is used for cache control when resources that make up an application are cached and held when reuse of the application is assumed. . The MH-Cache Information Descriptor can be placed in the MH-AIT.

(50) MH-Probabilistic Application Delay Descriptor MH-Probabilistic Application Delay Descriptor delays the timing of application control by a stochastically set delay amount, assuming load distribution of server access for application acquisition. described in The MH-Probabilistic Adaptation Delay Descriptor can be placed in the MH-AIT.

(51) Link Destination PU Descriptor The link destination PU descriptor describes other presentation units that may transition from the presentation unit (PU). Linked-to PU descriptors may be placed in the DCC table.

(52) Lock Cache Specification Descriptor The lock cache specification descriptor describes the specification of a file to be cached and locked in the presentation unit. Lock cache specification descriptors can be placed in the DCC table.

(53) Unlock Cache Specification Descriptor The unlock cache specification descriptor describes the specification of files to be unlocked among files locked in the presentation unit. Unlocked cache specification descriptors can be placed in the DCC table.

(54) Descriptor set by the service provider In addition, it is possible to prepare descriptors set independently by the service provider.

<Relationship between data transmission and each control information in the MMT method>
Here, with reference to FIG. 6E, the relationship between data transmission and typical tables in the broadcast system to which the broadcast receiver 100 of the present embodiment is compatible will be described.

In the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment is compatible, data transmission can be performed through a plurality of paths such as TLV streams via broadcast transmission paths and IP data flows via communication lines. The TLV stream includes TLV-SI such as TLV-NIT and AMT, and IP data flow, which is a data flow of IP packets. The IP data flow includes a video asset including a series of video MPUs and an audio asset including a series of audio MPUs. Similarly, an IP data flow may include a caption asset including a series of caption MPUs, a text super asset including a series of text super MPUs, a data asset including a series of data MPUs, and so on. These various assets are associated in units of "packages" by an MPT (MMT package table) that is stored in a PA message and transmitted. Specifically, the MPT contains a package ID (corresponding to the "MMT_package_id_byte" parameter shown in FIG. 17 to be described later) and the asset ID of each asset included in the package (corresponding to the "asset_id_byte" parameter shown in FIG. 17 to be described later). is described, the association is performed.

The assets that make up the package can be only the assets in the TLV stream, but they can also include the assets that are transmitted in the IP data flow of the communication line, as shown in FIG. 6E. This is done by including location information (corresponding to "MMT_general_location_info( )" shown in FIG. 17 to be described later) of each asset included in the package in the MPT so that the broadcast receiving apparatus 100 of this embodiment can refer to each asset. It can be realized by making it comprehensible. Specifically, by changing the value of the "MMT_general_location_infolocation_type" parameter located in the location information,
(1) Data multiplexed in the same IP data flow as MPT (location_type=0x00)
(2) Data multiplexed in IPv4 data flow (location_type=0x01)
(3) Data multiplexed in IPv6 data flow (location_type=0x02)
(4) Data multiplexed in broadcast MPEG2-TS (location_type=0x03)
(5) Data multiplexed in MPEG2-TS format in IP data flow (location_type=0x04)
(6) Data at the specified URL (location_type=0x05)
For example, various data transmitted through various transmission paths can be configured so that the broadcast receiving apparatus 100 can refer to them.

Among the above-mentioned reference destinations, (1) is, for example, an IP data flow received via a digital broadcast signal received by the tuner/demodulator 131 of the broadcast receiver 100 shown in FIG. 7A, which will be described later. When the MPT is transmitted by including it in the IP data flow on the communication line side, the reference destination of (1) may be the IP data flow received via the communication line by the LAN communication unit 121, which will be described later. Also, the above (2), (3), (5), and (6) are IP data flows received via a communication line by the LAN communication unit 121, which will be described later. Further, the above (4) includes, for example, a receiving function for receiving a digital broadcasting signal using the MMT method and a digital broadcasting using the MPEG2-TS method, like the broadcast receiving apparatus 800 of the second embodiment shown in FIG. 24 which will be described later. In the case of a broadcast receiving device having both reception functions for receiving signals, digital broadcasting using the MPEG2-TS system based on MPT location information ("MMT_general_location_info ()") included in the digital broadcasting signal using the MMT system It can be used when referring to the data multiplexed in the MPEG2-TS received by the reception function that receives the signal.

The data constituting the "package" is specified in this way, but in the broadcasting system to which the broadcast receiving apparatus 100 of the present embodiment is compatible, a series of data in units of "packages" is converted into units of "services" of digital broadcasting. treated as

Furthermore, in the MPT, the presentation time information of each MPU specified by the MPT (corresponding to the "mpu_presentation_time" parameter shown in FIG. 13B described later) is described. It is possible to present (display, output, etc.) the MPU in conjunction with a clock based on NTP, which is time information in UTC notation. Presentation control of various data using the NTP-based clock will be described later.

In the data transmission method of this embodiment shown in FIG. 6E, there is also the concept of "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, the duration time is calculated from the start time (corresponding to the "start_time" parameter shown in FIG. A series of data included in a period of minutes (corresponding to the "duration" parameter shown in FIG. 21 to be described later) is data included in the concept of the "event". MH-EIT performs various types of processing (for example, program guide generation processing, control of recording reservation and viewing reservation, copyright management processing such as temporary storage) in the broadcast receiving apparatus 100 of this embodiment. etc. can be used.

[Hardware Configuration of Broadcast Receiver]
FIG. 7A is a block diagram showing an example of the internal configuration of broadcast receiving apparatus 100. As shown in FIG. Broadcast receiver 100 includes main control unit 101, system bus 102, ROM 103, RAM 104, storage unit 110, LAN communication unit 121, expansion interface unit 124, digital interface unit 125, tuner/demodulation unit 131, separation unit 132. , video decoder 141, video color gamut conversion unit 142, audio decoder 143, text super decoder 144, subtitle decoder 145, subtitle synthesizing unit 146, subtitle color gamut conversion unit 147, data decoder 151, cache unit 152, application control unit 153, Consists of a browser unit 154, an application color gamut conversion unit 155, a sound source unit 156, a video synthesis unit 161, a monitor unit 162, a video output unit 163, an audio synthesis unit 164, a speaker unit 165, an audio output unit 166, and an operation input unit 170. be done.

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 data communication path for transmitting and receiving data 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. is used. The ROM 103 may store operation setting values 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 RAM 104 may be configured integrally with the main control unit 101 . Further, 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. 7A.

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 200 and various data created by the operation program. In addition, content such as moving images, still images, and sounds obtained from broadcast waves or downloaded via the Internet 200 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, for example, devices such as non-volatile semiconductor element memories such as flash ROMs and SSDs (Solid State Drives) and magnetic disk drives such as HDDs (Hard Disc Drives) are used.

It should be noted that each operation program stored in the ROM 103 and the storage (accumulation) unit 110 can be added, updated, and expanded by downloading from each server device on the Internet 200 .

A LAN (Local Area Network) communication unit 121 is connected to the Internet 200 via a router device 200r, and transmits and receives data to and from each server device on the Internet 200 and other communication devices. It is also assumed that an MMT data string (or part thereof) of a program transmitted via a communication line is acquired. The connection with the router device 200r may be a wired connection or a wireless connection such as Wi-Fi (registered trademark). It is assumed that 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 tuner/demodulator 131 receives broadcast waves transmitted from the radio tower 300t via the antenna 100a, and tunes (selects) to a service channel desired by the user under the control of the main controller 101. FIG. Furthermore, the tuner/demodulator 131 demodulates the received broadcast signal to obtain an MMT data string. Note that although the example shown in FIG. 7A exemplifies a configuration in which there is one tuner/demodulator, the broadcast receiving apparatus 100 may include a tuner/demodulator for the purpose of simultaneous display of multiple screens, recording of counterprograms, and the like. It is good also as a structure which mounts more than one.

The separation unit 132 is an MMT decoder, and separates real-time presentation elements such as a video data string, an audio data string, a text superimposition data string, a caption data string, and the like based on the control signal in the input MMT data string into the video decoder 141. , audio decoder 143, text decoder 144, caption decoder 145, and the like. The data input to the separation unit 132 is an MMT data string transmitted via a broadcast transmission line and demodulated by the tuner/demodulation unit 131, or MMT data transmitted via a communication line and received by the LAN communication unit 121. It can be a row. Also, the separation unit 132 reproduces the multimedia application and file-based data that are its constituent elements, and temporarily stores them in the cache unit 152 . The separating unit 132 also extracts general-purpose data and outputs it to the data decoder 151 in order to use it for streaming data for applications or data used by a player that presents data other than audiovisual subtitles. Further, the separation unit 132 may perform error correction, access restriction control, etc. for the input MMT data string under the control of the main control unit 101 .

The video decoder 141 decodes the video data string input from the separation unit 132 and outputs video information. The video color gamut conversion unit 142 performs color space conversion processing on the video information decoded by the video decoder 141 as necessary for video synthesis processing by the video synthesis unit 161 . The audio decoder 143 decodes the audio data string input from the separator 132 and outputs audio information. Also, the video decoder 141 and the audio decoder 143 may receive streaming data such as MPEG-DASH (MPEG-Dynamic Adaptive Streaming over HTTP) format obtained from the Internet 200 via the LAN communication unit 121. good. Also, the video decoder 141, the video color gamut conversion unit 142, the audio decoder 143, etc. may be provided in plurality in order to simultaneously decode multiple types of video data strings and audio data strings.

The superimposed text decoder 144 decodes the superimposed data string input from the separator 132 and outputs superimposed text information. The caption decoder 145 decodes the caption data string input from the separation unit 132 and outputs caption information. The superimposed text information output from the superimposed text decoder 144 and the subtitle information output from the subtitle decoder 145 are subjected to a synthesizing process in the subtitle synthesizing unit 146. For image synthesis processing, color space conversion processing is applied as necessary. In this embodiment, of the services centered on character information presented simultaneously with the video of the broadcast program, those related to the content of the video are called subtitles, and the other services are called superimposed text. do. In addition, when they are not distinguished, they are collectively referred to as subtitles.

The browser unit 154 retrieves multimedia application files and file-based data, which are components thereof, obtained from a server device on the Internet 200 via the cache unit 152 or the LAN communication unit 121 as control information contained in the MMT data string and LAN The information is presented according to instructions from the application control unit 153 that interprets the control information acquired from the server device on the Internet 200 via the communication unit 121 . The multimedia application file may be an HTML (Hyper Text Markup Language) document, a BML (Broadcast Markup Language) document, or the like. The application information output from the browser unit 154 is further subjected to color space conversion processing in the application color gamut conversion unit 155 for image composition processing in the image composition unit 161 as necessary. The browser unit 154 also reproduces application audio information by working on the sound source unit 156 .

The video composition unit 161 receives the video information output from the video color gamut conversion unit 142, the caption information output from the subtitle color gamut conversion unit 147, the application information output from the application color gamut conversion unit 155, and the like. Processing such as selection and/or superimposition is performed. The video synthesizing unit 161 includes a video RAM (not shown), and the monitor unit 162 and the like are driven based on the video information and the like input to the video RAM. In addition, the video synthesizing unit 161, under the control of the main control unit 101, generates an EPG (Electronic Program Guide) created based on information such as scaling processing and MH-EIT included in the MMT-SI as necessary. Superimpose processing of screen information, etc. are performed. The monitor unit 162 is, for example, a display device such as a liquid crystal panel, and provides the user of the broadcast receiving apparatus 100 with video information selected and/or superimposed by the video synthesizing unit 161 . The video output unit 163 is a video output interface that outputs the video information selected and/or superimposed by the video synthesizing unit 161 .

It should be noted that the presentation function of the broadcast receiving apparatus 100 of this embodiment has a logical plane structure in order to display the multimedia service as intended by the provider. FIG. 7B shows an example of the configuration of the logical plane structure provided by the presentation function of the broadcast receiving apparatus 100 of this embodiment. In the logical plane structure, a superimposed text plane for displaying superimposed text is arranged in the foreground, and a subtitle plane for displaying subtitles is arranged in the next layer. A multimedia plane for displaying broadcast video, multimedia applications, or composite video thereof is placed on the third layer, and a background plane is placed on the backmost layer. In the subtitle synthesizing unit 146 and the video synthesizing unit 161, drawing of superimposed text information on the superimposed text plane, drawing of subtitle information on the subtitle plane, and drawing of video information, application information, etc. on the multimedia plane are performed. Also, the background color is drawn on the background plane based on the LCT and the like included in the MMT-SI. It is assumed that a plurality of multimedia planes in the third layer can be prepared according to the number of video decoders 141 . However, even if there are a plurality of multimedia planes, the application information and the like output from the application color gamut conversion unit 155 shall be output only to the frontmost multimedia plane.

The audio synthesizing unit 164 receives the audio information output from the audio decoder 143 and the application audio information reproduced by the sound source unit 156, and performs processing such as selection and/or mixing as appropriate. The speaker unit 165 provides the user of the broadcast receiving apparatus 100 with the audio information selected and/or mixed by the audio synthesizing unit 164 . The audio output unit 166 is an audio output interface that outputs audio information selected and/or mixed by the audio synthesis unit 164 .

The extension interface unit 124 is a group of interfaces for extending the functions of the broadcast receiving apparatus 100, and in this embodiment, it is assumed to be composed of an analog video/audio interface, a USB (Universal Serial Bus) interface, a memory interface, and the like. do. 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. Broadcast programs and contents may be recorded by connecting an HDD. 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 digital interface unit 125 is an interface that outputs or inputs encoded digital video data and/or digital audio data. The digital interface unit 125 can directly output the MMT data string obtained by demodulation by the tuner/demodulator 131, the MMT data string acquired via the LAN communication unit 121, or the mixed data of each MMT data string. shall be Also, control may be performed so that the MMT data string input from the digital interface unit 125 is input to the separation unit 132 . Output of digital content stored in the storage (accumulation) unit 110 or storage of digital content in the storage (accumulation) unit 110 may be performed via the digital interface unit 125 .

The digital interface unit 125 is a DVI terminal, an HDMI (registered trademark) terminal, a Display Port (registered trademark) terminal, or the like, and outputs or inputs data in a format conforming to the DVI specification, the HDMI specification, the Display Port specification, or the like. It can be anything. It may be output or input in the form of serial data conforming to the IEEE1394 specification or the like. Alternatively, it may be configured as an IP interface that performs digital interface output via hardware such as Ethernet (registered trademark) or wireless LAN. In this case, the digital interface section 125 and the LAN communication section 121 may share the hardware configuration.

The operation input unit 170 is an instruction input unit for inputting an operation instruction to the broadcast receiving apparatus 100. In this embodiment, a remote control receiving unit for receiving commands transmitted from a remote controller (not shown) and a button switch are arranged. It shall consist of operation keys. Only one of them may be used. Further, the operation input unit 170 may be replaced by a touch panel arranged over the monitor unit 162 . A keyboard or the like connected to the expansion interface section 124 may be substituted. The remote control not shown may be replaced by the portable information terminal 700 having a remote control command transmission function.

As described above, when the broadcast receiving apparatus 100 is a television receiver or the like, the video output section 163 and the audio output section 166 are not essential components of the present invention. In addition to the television receiver, the 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. It may be a PC (Personal Computer), a tablet terminal, a navigation device, a game machine, or the like, which has a digital broadcasting reception function and a broadcast communication cooperation function. If the broadcast receiving apparatus 100 is a DVD recorder, HDD recorder, STB, or the like, the monitor section 162 and the speaker section 165 may not be provided. By connecting an external monitor and an external speaker to the video output unit 163 and the audio output unit 166 or the digital interface unit 125, the same operation as the broadcast receiving apparatus 100 of this embodiment can be performed.

[System Configuration of Clock Synchronization/Presentation Synchronization of Broadcast Receiver]
FIG. 7C is an example of a clock synchronization/presentation synchronization system configuration in a broadcasting system to which the broadcast receiving apparatus 100 of this embodiment is compatible. In the broadcasting system of this embodiment, the UTC is transmitted in the 64-bit NTP time stamp format from the broadcasting transmission system to the receiver (broadcast receiving apparatus 100 of this embodiment, etc.). In the NTP time stamp format, "seconds or more" of UTC are represented by 32 bits, and "less than seconds" are represented by 32 bits. However, in practice, it is difficult to reproduce one second with 32-bit precision. For this reason, the system clock for synchronizing the video system and the system clock for operating the clock in NTP format are, for example, "2 to the 24th power" Hz (approximately 16.8 MHz) as shown in FIG. ) may be used. In addition, considering that the system clock in the conventional broadcasting system was 27 MHz and that the hardware configuration of the receiver can be easily constructed, It is desirable to employ a power-law frequency as the system clock.

In addition, when the system clock is set to a power-of-two frequency such as "2 to the 24th power" to "2 to the 28th power" on the broadcast transmission system side and the receiver side as described above, the reception from the broadcast transmission system side In the NTP time stamp format transmitted to the machine side, the lower 8 to 4 bits that are not referred to by the system clock or the PLL (Phase Locked Loop) system for reproducing the clock in NTP format are "0" or "1". may be fixed to . That is, if the system clock is ``2 nth power'' Hz (n=24 in the example of FIG. 7C), the lower ``32-n'' bits of the NTP time stamp format are fixed to ``0'' or ``1''. You can do it. Alternatively, the receiver side may be processed so as to ignore the lower "32-n" bits of the NTP time stamp format.

On the broadcast transmission system side, when time information in NTP format is obtained from the outside, a PLL system is configured with a 32+n-bit counter based on a VCO (Voltage Controlled Oscillator) of "2 nth power" Hz, and the time information given from the outside is Implement synchronized delivery system clocks. In addition, the entire signal processing system is operated in synchronization with the system clock of "2 nth power" Hz. Furthermore, the output of the transmission system clock is periodically transmitted to the receiver side via the broadcast transmission line as time information in NTP length format.

On the receiver side, the time information in the NTP length format is received via the broadcast transmission line, and the receiving system clock is reproduced by the PLL system based on the VCO of "2 to the nth power" Hz, like the broadcast transmission system side. As a result, the reception system clock becomes a clock synchronized with the broadcast transmission system side. In addition, by operating the signal processing system of the receiver in synchronization with the system clock of "2 to the nth power" Hz, clock synchronization between the broadcasting transmission system side and the receiver side is realized, enabling stable signal reproduction. Become. Also, the decoding time and the presentation time for each presentation unit of the video/audio signal are set on the broadcast transmission system side based on the time information in the NTP format. Here, the MPT stored in the PA message transmitted by the broadcast signal stores an MPU time stamp descriptor shown in FIG. 13B, which will be described later. The 'mpu_sequence_number' parameter in the MPU timestamp descriptor of FIG. It is shown in timestamp format. Therefore, the receiver refers to the MPU time stamp descriptor stored in the MPT, and can control the presentation (display, output, etc.) timing for each MPU of video signals, audio signals, subtitles, superimposed text, etc. .

Note that when focusing on the control of the decoding timing and presentation timing for each presentation unit of the video/audio signal described above, synchronization of the video/audio signal can be achieved by a clock of about "2 to the 16th power" Hz (approximately 65.5 KHz). can be secured, and in this case, it is not necessary to refer to the lower 16 bits of the NTP time stamp format described in the MPU time stamp descriptor or the like. That is, when a clock of "2 mth power" Hz generated by frequency division of the system clock is used for controlling the decoding timing and the presentation timing, the lower order of the NTP timestamp format described in the MPU timestamp descriptor etc. It is not necessary to refer to the "32-m" bits. Therefore, the lower "32-m" bits of the NTP time stamp format described in the MPU time stamp descriptor or the like may be fixed to "0" or "1".

[Software Configuration of Broadcast Receiver]
FIG. 7D is a software configuration diagram of the broadcast receiving apparatus 100 of this embodiment, and shows the software configuration in the ROM 103, RAM 104, and storage (accumulation) section 110. As shown in FIG. In this embodiment, the ROM 103 stores a basic operating program 1001 and other operating programs, and the storage unit 110 stores a receiving function program 1002 and other operating programs. The storage (accumulation) unit 110 also includes a content storage area 1200 for storing content such as moving images, still images, and audio, and an authentication area for storing authentication information required when accessing external portable terminal devices and each server device. It is assumed that an information storage area 1300 and various information storage areas for storing other various information are provided.

A basic operation program 1001 stored in the ROM 103 is loaded into the RAM 104, and the main control unit 101 executes the loaded basic operation program to configure a basic operation execution unit 1101. FIG. Similarly, the reception function program 1002 stored in the storage (accumulation) unit 110 is expanded in the RAM 104, and the main control unit 101 executes the expanded reception function program to configure the reception function execution unit 1102. do. The RAM 104 is also assumed to have a temporary storage area for temporarily holding data created during execution of each operating program as needed.

In the following description, for the sake of simplicity, the basic operation program 1001 stored in the ROM 103 is loaded into the RAM 104 and executed by the main control unit 101 to control each operation block. It is assumed that the unit 1101 controls each operation block. Similar descriptions are made for other operating programs.

The receiving function executing unit 1102 controls each operation block of the broadcast receiving apparatus 100 in order to reproduce components such as video and audio transmitted by the broadcasting system of this embodiment. In particular, the transport processing unit 1102a mainly controls the MMT decoder function of the separating unit 132, and distributes the video data string, the audio data string, etc. separated from the MMT data string to the corresponding decoding processing units. The AV decoding processing unit 1102b mainly controls the video decoder 141, the audio decoder 143, and the like. The application processing unit 1102 c mainly controls the cache unit 152 , the application control unit 153 , the browser unit 154 and the sound source unit 156 . The superimposed text processing unit 1102d mainly controls the superimposed text decoder 144. FIG. The caption processing unit 1102 e mainly controls the caption decoder 145 . The general-purpose data processing unit 1102f mainly controls the data decoder 151. FIG. The EPG generation unit 1102g interprets the description contents such as MH-EIT included in the MMT-SI and generates an EPG screen. The presentation processing unit 1102h converts the video color gamut conversion unit 142, the subtitle synthesis unit 146, the subtitle color conversion unit 147, the application color conversion unit 155, the video synthesis unit 161, and the audio synthesis unit 164 based on the logical plane structure. is primarily controlled.

Each of the operation programs may be stored in advance in the ROM 103 and/or the storage (accumulation) unit 110 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 unit 121 after product shipment. Further, each operation program stored in a memory card, an optical disc, or the like may be obtained through the expansion interface section 124 or the like.

[Broadcast station server configuration]
FIG. 8 is a block diagram showing an example of the internal configuration of the broadcasting station server 300. As shown in FIG. The broadcasting station server 300 is composed of a main control section 301 , a system bus 302 , a RAM 304 , a storage section 310 , a LAN communication section 321 and a digital broadcast signal transmission section 360 .

The main control section 301 is a microprocessor unit that controls the entire broadcasting station server 300 according to a predetermined operation program. A system bus 302 is a data communication path for transmitting and receiving data between the main control unit 301 and each operation block in the broadcasting station server 300 . A RAM 304 serves as a work area when each operation program is executed.

The storage unit 310 stores a basic operation program 3001 , a broadcast content management/distribution program 3002 and a broadcast content transmission program 3003 , and further comprises a broadcast content storage area 3200 and metadata storage area 3300 . A broadcast content storage area 3200 stores program content of each broadcast program broadcast by a broadcasting station. The metadata storage area 3300 stores metadata such as program titles, program IDs, program outlines, performers, broadcast dates and times, and copy control information related to each program content of each broadcast program.

Also, the basic operation program 3001, the broadcast content management/distribution program 3002, and the broadcast content transmission program 3003 stored in the storage unit 310 are expanded in the RAM 304, and the main control unit 301 executes the expanded programs. Thus, a basic operation execution unit 3101, a broadcast content management/distribution execution unit 3102, and a broadcast content transmission execution unit 3103 are configured.

In the following description, for the sake of simplicity, the basic operation program 3001 stored in the storage unit 310 is loaded into the RAM 304 and executed by the main control unit 301 to control each operation block. It is assumed that the action execution unit 3101 controls each action block. Similar descriptions are made for other operating programs.

The broadcast content management/distribution execution unit 3102 manages the program content and the like of each broadcast program and each metadata accumulated in the broadcast content storage area 3200 and the metadata storage area 3300, and manages the program content and the like of each broadcast program and each metadata. It controls when metadata is provided to service providers based on contracts. Further, the broadcast content management/distribution execution unit 3102, when providing the program content and the like of each broadcast program and each metadata to the service provider, may be provided to the service provider based on the contract as necessary. Authentication processing of the server 400 or the like may be performed.

Broadcast content transmission execution unit 3103 receives program content of broadcast programs stored in broadcast content storage area 3200, program titles, program IDs, and program content copy control information of broadcast programs stored in metadata storage area 3300. Time schedule management and the like are performed when the MMT data string including the data is transmitted from the radio tower 300t via the digital broadcast signal transmission unit 360. FIG.

The LAN communication unit 321 is connected to the Internet 200 and communicates with the service provider server 400 and the like on the Internet 200 . It is assumed that the LAN communication unit 321 includes an encoding circuit, a decoding circuit, and the like. The digital broadcast signal transmission unit 360 modulates an MMT data string composed of a video data string, an audio data string, a program information data string, etc., such as program content of each broadcast program stored in the broadcast content storage area 3200, and modulates it. , and the radio tower 300t as digital broadcast waves.

[Configuration of service provider server]
FIG. 9 is a block diagram showing an example of the internal configuration of the service provider server 400. As shown in FIG. The service provider server 400 is composed of a main control unit 401, a system bus 402, a RAM 404, a storage unit 410, and a LAN communication unit 421.

The main control unit 401 is a microprocessor unit that controls the entire service provider server 400 according to a predetermined operating program. A system bus 402 is a data communication path for transmitting and receiving data between the main control unit 401 and each operation block in the service provider 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 video content management/distribution program 4002, and an application management/distribution program 4004, and further includes a video content storage area 4200, metadata storage area 4300, application storage area 4400, and user information storage. A region 4500 is provided. The video content storage area 4200 stores program content of broadcast programs provided from the broadcasting station server 300 as video content. In addition, it stores video content and the like produced by the service provider. The metadata storage area 4300 stores metadata provided by the broadcasting station server 300, metadata related to video content produced by the service provider, and the like. The application storage area 4400 stores various applications and the like for implementing services linked to broadcast programs to be distributed in response to requests from each television receiver. The user information storage area 4500 stores information (personal information, authentication information, etc.) on users permitted to access the service provider server 400 .

Further, the basic operation program 4001, the video content management/distribution program 4002, and the application management/distribution program 4004 stored in the storage unit 410 are developed in the RAM 404, and furthermore, the main control unit 401 executes the expanded basic operation program and the image. A basic operation execution unit 4101, a video content management/distribution execution unit 4102, and an application management/distribution execution unit 4104 are configured by executing the content management/distribution program and the application management/distribution 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 action execution unit 4101 controls each action block. Similar descriptions are made for other operating programs.

The video content management/distribution execution unit 4102 acquires the program content and the like of the broadcast program from the broadcasting station server 300 and metadata, and manages the video content and the like accumulated in the video content storage area 4200 and the metadata storage area 4300 and each metadata. and control distribution of the video content and each metadata to each television receiver. Furthermore, the video content management/distribution executing unit 4102 performs authentication processing of each television receiver as necessary when distributing each video content and each metadata to each television receiver. you can go Also, the application management/distribution executing unit 4104 manages each application stored in the application storage area 4400 and controls when each application is distributed in response to a request from each television receiver. Furthermore, the application management/distribution executing unit 4104 may perform authentication processing of each television receiver, etc., as necessary when distributing each application to each television receiver.

The LAN communication unit 421 is connected to the Internet 200 and communicates with the broadcasting station server 300 on the Internet 200 and the broadcast receiving device 100 via the router device 200r. It is assumed that the LAN communication unit 421 includes an encoding circuit, a decoding circuit, and the like.

[Hardware configuration of portable information terminal]
FIG. 10A is a block diagram showing an example of the internal configuration of portable information terminal 700. As shown in FIG. The portable information terminal 700 includes a main control unit 701, a system bus 702, a ROM 703, a RAM 704, a storage unit 710, a communication processing unit 720, an extended interface unit 724, an operation unit 730, an image processing unit 740, an audio processing unit 750, and a sensor unit 760. , consists of

Main control unit 701 is a microprocessor unit that controls the entire portable information terminal 700 according to a predetermined operation program. A system bus 702 is a data communication path for transmitting and receiving data between the main control unit 701 and each operation block in the portable information terminal 700 .

A ROM 703 is a memory that stores a basic operating program such as an operating system and other operating programs, and uses, for example, a rewritable ROM such as an EEPROM or a flash ROM. A RAM 704 serves as a work area for executing the basic operation program and other operation programs. The ROM 703 and RAM 704 may be configured integrally with the main control section 701 . Also, the ROM 703 may use a partial storage area in the storage section 710 instead of having an independent configuration as shown in FIG. 10A.

The storage unit 710 stores an operation program and operation setting values of the mobile information terminal 700, personal information of the user of the mobile information terminal 700, and the like. Further, it is possible to store an operation program downloaded via the Internet 200 and various data created by the operation program. In addition, content such as moving images, still images, and sounds downloaded via the Internet 200 can also be stored. All or part of the functions of the ROM 703 may be replaced by a partial area of the storage unit 710 . Moreover, the storage unit 710 needs to retain stored information even when power is not supplied to the portable information terminal 700 from the outside. Therefore, for example, devices such as non-volatile semiconductor element memories such as flash ROMs and SSDs, and magnetic disk drives such as HDDs are used.

It should be noted that each operation program stored in the ROM 703 and the storage unit 710 can be added, updated, and expanded in function by downloading from each server device on the Internet 200 .

The communication processing unit 720 is composed of a LAN communication unit 721 , a mobile telephone network communication unit 722 and an NFC communication unit 723 . The LAN communication unit 721 is connected to the Internet 200 via the router device 200r and the access point 200a, and transmits and receives data to and from each server device on the Internet 200 and other communication devices. It is assumed that the connection with the router device 200r and the access point 200a is performed by wireless connection such as Wi-Fi (registered trademark). The mobile phone network communication unit 722 performs telephone communication (phone call) and data transmission/reception by wireless communication with the base station 600b of the mobile phone network. The NFC communication unit 723 performs wireless communication with a corresponding reader/writer when in close proximity. The LAN communication unit 721, the mobile phone network communication unit 722, and the NFC communication unit 723 are each provided with an encoding circuit, a decoding circuit, an antenna, and the like. Also, the communication processing unit 720 may further include other communication units such as a BlueTooth (registered trademark) communication unit and an infrared communication unit.

The extended interface unit 724 is a group of interfaces for extending the functions of the mobile information terminal 700, and in this embodiment, it is assumed to be composed of a video/audio interface, a USB interface, a memory interface, and the like. The video/audio interface inputs video/audio signals from an external video/audio output device, outputs 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. 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 unit 730 is an instruction input unit for inputting an operation instruction to the portable information terminal 700, and in this embodiment, it is composed of a touch panel 730t arranged over the display unit 741 and an operation key 730k arranged with button switches. shall be Only one of them may be used. The portable information terminal 700 may be operated using a keyboard or the like connected to the extended interface section 724 . The portable information terminal 700 may be operated using a separate terminal device connected by wired communication or wireless communication. That is, the mobile information terminal 700 may be operated from the broadcast receiving device 100 . Also, the touch panel function may be provided by the display unit 741 .

The image processing section 740 is composed of a display section 741 , an image signal processing section 742 , a first image input section 743 and a second image input section 744 . The display unit 741 is, for example, a display device such as a liquid crystal panel, and provides the user of the portable information terminal 700 with image data processed by the image signal processing unit 742 . The image signal processing unit 742 includes a video RAM (not shown), and the display unit 741 is driven based on the image data input to the video RAM. Also, the image signal processing unit 742 has functions such as format conversion and superimposition processing of menus and other OSD (On Screen Display) signals, if necessary. The first image input unit 743 and the second image input unit 744 convert the light input from the lens into an electrical signal using an electronic device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor. , is a camera unit that inputs image data of surroundings and objects.

The audio processing unit 750 is composed of an audio output unit 751 , an audio signal processing unit 752 and an audio input unit 753 . The audio output unit 751 is a speaker, and provides the user of the mobile information terminal 700 with the audio signal processed by the audio signal processing unit 752 . A voice input unit 753 is a microphone that converts a user's voice or the like into voice data and inputs the voice data.

The sensor unit 760 is a group of sensors for detecting the state of the mobile information terminal 700, and in this embodiment includes a GPS receiver unit 761, a gyro sensor 762, a geomagnetic sensor 763, an acceleration sensor 764, an illuminance sensor 765, and a proximity sensor 766. , consists of These sensors make it possible to detect the position, tilt, direction, movement of the mobile information terminal 700, the brightness of the surroundings, the proximity of surrounding objects, and the like. Moreover, the mobile information terminal 700 may further include other sensors such as an air pressure sensor.

The mobile information terminal 700 may be a mobile phone, a smart phone, a tablet terminal, or the like. A PDA (Personal Digital Assistant) or a notebook PC may be used. It may also be a digital still camera, a video camera capable of capturing moving images, a portable game machine, a navigation device, or other portable digital equipment.

Note that the configuration example of the mobile information terminal 700 shown in FIG. 10A includes many components such as the sensor unit 760 that are not essential to the present embodiment, but even if the configuration does not include these components, the present embodiment without compromising the effect of In addition, a configuration (not shown) such as a digital broadcast reception function, an electronic money payment function, and the like may be added.

[Software configuration of portable information terminal]
FIG. 10B is a software configuration diagram of the portable information terminal 700 of this embodiment, and shows the software configuration in the ROM 703, RAM 704, and storage unit 710. As shown in FIG. In this embodiment, the ROM 703 stores a basic operating program 7001 and other operating programs, and the storage unit 710 stores a cooperative control program 7002 and other operating programs. The storage unit 710 also includes a content storage area 7200 for storing content such as moving images, still images, and audio, an authentication information storage area 7300 for storing authentication information required when accessing the television receiver and each server device, Various information storage areas for storing various other information are provided.

A basic operation program 7001 stored in the ROM 703 is loaded into the RAM 704, and the main control unit 701 executes the loaded basic operation program to configure a basic operation execution unit 7101. FIG. Similarly, the cooperative control program 7002 stored in the storage unit 710 is expanded in the RAM 704, and the main control unit 701 executes the expanded cooperative control program to configure the cooperative control execution unit 7102. The RAM 704 also has a temporary storage area for temporarily holding data created during execution of each operation program as needed.

In the following description, for the sake of simplicity, the basic operation program 7001 stored in the ROM 703 is loaded into the RAM 704 and executed by the main control unit 701 to control each operation block. It is assumed that the unit 7101 controls each operation block. Similar descriptions are made for other operating programs.

The cooperation control execution unit 7102 manages device authentication, connection, transmission and reception of each data, etc. when the mobile information terminal 700 performs cooperative operation with the television receiver. Also, the cooperation control execution unit 7102 is assumed to have a browser engine function for executing an application that works in conjunction with the television receiver.

Each operation program may be stored in the ROM 703 and/or the storage unit 710 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 after product shipment. Further, each operation program stored in a memory card, an optical disc, or the like may be acquired via the expansion interface section 724 or the like.

[Time Management of Broadcast Receiver]
The broadcast receiver of this embodiment has two kinds of time management functions. The first time management function is an NTP-based time management function, which has already been described with reference to FIG. 7C. The second time management function is a time management function based on MH-TOT, and time is managed based on the time information transmitted by MH-TOT described in FIG. 6B.

An example of the structure of time information transmitted by NTP is shown in FIG. 13A. An example of the data structure of the MPU timestamp descriptor is shown in FIG. 13B. The "reference_timestamp" parameter and the "transmit_timestamp" parameter in the NTP format are 64-bit long NTP format time data, and the "mpu_presentation_time" parameter in the MPU time stamp descriptor is also a 64-bit NTP time stamp. format time data. The time data in the NTP length format and the time data in the NTP time stamp format are data in which "seconds or more" of UTC are represented by 32 bits, and "less than seconds" are represented by 32 bits. That is, the NTP format time information can transmit time information up to "less than a second". Furthermore, since the time information in NTP format is UTC notation, unlike clock management in conventional digital broadcasting, as shown in FIG. It is also possible to match the NTP contained in the signal received on the line).

On the other hand, the information transmitted by MH-TOT is as follows. Broadcast receiving apparatus 100 is assumed to be capable of acquiring the current date and Japan Standard Time from MH-TOT. FIG. 11A shows an example of the data structure of MH-TOT. The broadcast receiving apparatus 100 can acquire the current date and current time from the "JST_time" parameter of the MH-TOT. The "JST_time" parameter is, as shown in FIG. It shall contain 24-bit information represented by a Binary-Coded Decimal (BCD). The current date can be calculated by performing a predetermined operation on the 16-bit encoded data of the MJD. Six 4-bit binary coded decimal numbers represent "hour" in two decimal digits by two 4-bit binary coded decimal numbers. The digits represent "minutes" and the last two 4-bit binary coded decimal numbers represent "seconds" in two decimal digits.

Therefore, the difference between the time based on NTP and the time based on MH-TOT is that the former NTP is information in UTC notation that can transmit time information up to "less than a second" as described above, whereas MH-TOT is information in UTC notation. The point is that the information transmitted by TOT is information up to "seconds" in JST notation.

The broadcast receiving apparatus 100 of the present embodiment has a time management function based on NTP, which is time information in UTC notation, and synchronizes decoding and display of video, audio, subtitles, superimposed text, and other presentation data that are contents of broadcast signals. , it is possible to achieve more accurate synchronization processing. Furthermore, by referring to the information in UTC notation instead of the clock notation of the broadcasting station, video, audio, subtitles, superimposed characters, or other data, which are the content of the broadcast signal received in the broadcast signal, are acquired through the communication line path. Synchronization processing of decoding and display with video, audio, subtitles, superimposed text, or other data can also be performed.

Furthermore, the broadcast receiving apparatus of the present embodiment has a time management function based on "JST_time" containing 24-bit information represented by six 4-bit binary coded decimal numbers of MH-TOT to present the current time to the user. It may be used for each process that handles the process or the MH-event information table (MH-EIT) described in FIG. 6B. In general, processing for presenting the current time to a user in a broadcast receiving apparatus rarely requires accuracy to the order of seconds. In addition, each time information described in the MH-event information table (MH-EIT) is represented by six 4-bit binary coded decimal numbers in the same manner as the EIT for conventional digital broadcasting transmitted in the MPEG2-TS system. This 24-bit information is stored as "hour", "minute", and "second" in two decimal digits each. For this reason, the time management function based on MH-TOT in the broadcast receiving apparatus 100 of this embodiment is easily compatible with the processing using MH-EIT. Specifically, processing using MH-EIT includes processing for generating a program guide (to be described later), control of recording reservation and viewing reservation, and copyright management processing such as temporary storage. This is because it is rare for any processing to require precision to within a second, and precision in units of one second is sufficient.

In addition, the generation process of the program table, the control of recording reservation and viewing reservation, and the copyright management process such as temporary storage are functions that are also installed in the receiver of the digital broadcasting system using the conventional MPEG2-TS system. . Then, in the broadcasting system of the present embodiment as well, in processing such as generation processing of the program table, control of recording reservations and viewing reservations, and copyright management processing such as temporary storage, it is different from the conventional MPEG2-TS digital broadcasting system. A broadcast receiving apparatus having both conventional MPEG2-TS digital broadcasting receiving function and MMT digital broadcasting receiving function can be constructed by configuring it so as to cope with consistent time management processing. In this case, it is no longer necessary to design a separate processing algorithm for each of these processes (program table generation processing, recording reservation control, viewing reservation control, copyright management processing such as temporary storage), which reduces costs. can do.

In addition, even a receiver that does not have the conventional MPEG2-TS format digital broadcast reception function but has only the MMT format digital broadcast reception function can generate program guides, control recording reservations and viewing reservations, Even without creating a completely new algorithm for processing such as copyright management processing such as temporary storage, it is possible to divert the algorithm of the function installed in the receiver of the digital broadcasting system using the conventional MPEG2-TS system. It can be developed at a lower cost.

Therefore, the configuration that uses the time management function based on the MH-TOT "JST_time" parameter for these processes (program table generation processing, recording reservation and viewing reservation control, copyright management processing such as temporary storage, etc.) By doing so, even an MMT digital broadcast receiver can be provided at a lower cost by enhancing compatibility with a conventional broadcast system.

As described above, the broadcast receiving apparatus 100 of this embodiment has a time management function using two types of time information with different accuracies. One of the time information is time information in a notation consistent with a conventional digital broadcasting system, the other time information is time information with higher resolution than the one of the time information, and the latter time information is the time information of the broadcast signal. By using it for synchronization processing of each content data, more advanced information presentation processing than the conventional broadcasting system is realized. A broadcast receiving apparatus can be provided at a low cost by using it for rights management processing and the like.

Therefore, in the broadcast receiving apparatus 100 of the present embodiment, it is possible to achieve both realization of more advanced information presentation processing and cost reduction by providing the two types of time management functions described above.

[First modification of time management]
Next, a first modified example of time management in the broadcasting system of this embodiment will be described below.

In the first modification, in order to improve the accuracy of the management time of the time management function based on NTP already described using FIG. information on the assumed delay time in the time information transmission is included in the broadcast signal and transmitted, and in the broadcast receiving device 100, the information on the assumed delay time is used for correcting the system clock of the time management function based on NTP. Also good.

At this time, the information about the assumed delay time may be configured to be transmitted within a TMCC (Transmission and Multiplexing Configuration Control) area outside the TLV multiplexed stream, not within the TLV multiplexed stream shown in FIG. good. If transmitted within the TMCC region, it becomes possible for the broadcast receiving apparatus 100 to extract information about the assumed delay time without going through the separation processing (demux processing) of the TLV multiplexed stream. That is, it is possible to obtain information that is less susceptible to the delay caused by the separation processing in the broadcast receiving apparatus 100, and therefore it is possible to correct the system clock with high accuracy. An example of the data structure of time information transmitted by the TMCC signal will be described with reference to FIG. 13C. The time information may be stored in, for example, the TMCC extension information area and transmitted. In the time information in the TMCC extension information area in FIG. 13C, the "delta" parameter is a 32-bit assumed transmission delay value from the time management server that distributes UTC or the server device that creates the TMCC signal to a general broadcast receiver. in signed fixed point. The upper 16 bits describe the integer part, and the lower 16 bits describe the decimal part. The "transmit_timestamp" parameter is a transmission time stamp, and describes the time when this TMCC signal is sent from the server device in the NTP time stamp length format. The upper 32 bits represent the integer part, and the lower 32 bits represent the decimal part.

In the first modification, the broadcast receiving apparatus 100 of the present embodiment receives information (for example, the above-mentioned "delta") regarding the assumed delay time described in the time information stored in the TMCC extension information area and transmitted. parameter and/or the "transmit_timestamp" parameter), the system clock of the NTP-based time management function used for synchronization processing of each content data of the broadcast signal can be corrected with higher precision.

[Second modification of time management]
Next, a second modified example of time management in the broadcasting system of this embodiment will be described below.

As described above, the broadcast receiving apparatus 100 of this embodiment has a time management function of acquiring the current date and Japan Standard Time from the information transmitted by MH-TOT and managing the time. The current date and Japan standard time acquired from the information transmitted by MH-TOT are superimposed on the video information, application information, etc. by the video synthesizing unit 161 of the broadcast receiving device 100, and are displayed on the monitor unit 162 and the video output unit 163. It can be output and provided to the user. As described above, the MH-TOT has the data structure shown in FIG. 11A, and the broadcast receiving apparatus 100 can obtain the current date and time from the "JST_time" parameter of the MH-TOT.

However, since the above-mentioned "JST_time" parameter uses only the lower 16 bits of the encoded data of MJD, overflow will occur on "April 22, 2038", and the predetermined operation A date after "April 23, 2038" cannot be represented by only the Therefore, in the second modification of this embodiment, by switching the calculation method depending on whether the value of MJD is equal to or greater than a predetermined value or less than the predetermined value, dates after "April 23, 2038" are represented. shall be controlled as much as possible.

FIG. 12 shows an example of a first calculation method used when the value of MJD is equal to or greater than a predetermined value, and an example of a second calculation method used when the value of MJD is less than the predetermined value. For example, if the predetermined value is "32768 (0x8000)", if the MJD is "32768" or more, the current date is calculated using the first calculation method, and if the MJD is less than "32768", calculates the current date using the second calculation method. Note that the case where the MJD is less than "32768" is equivalent to the case where the most significant bit of the 16-bit data of the MJD is "0". As a result, in the broadcast receiving apparatus 100 of this embodiment, it is possible to express dates after "April 23, 2038". However, the predetermined value can be set arbitrarily, and the predetermined value may be set to "16384 (0x4000)", "49152 (0xC000)", or the like. The switching condition of the arithmetic method may be that the upper 2 bits of the 16-bit data of MJD are "00" and the upper 2 bits of the 16-bit data of MJD are not "11". If the predetermined value is "32768" and the above means is used, dates before "September 4, 1948" cannot be represented, but this poses no particular problem in practical use as a television receiver. .

Further, instead of switching between the first calculation method and the second calculation method according to the comparison result between MJD and the predetermined value, the "reserved" parameter in the MH-TOT data structure shown in FIG. The first calculation method and the second calculation method may be switched according to a partially or entirely replaced flag or a newly added flag. For example, the flag is set to "1" if the MJD indicates "April 23, 2038" or later when the most significant bit of the 16-bit encoded data of the MJD is "0". However, if it does not indicate "April 23, 2038" or later, "0" should be set. Then, when the flag is "1", the second calculation method shown in FIG. 12 is used, and when the flag is "0", the first calculation method is used. Alternatively, a new descriptor having the same meaning as the flag may be prepared and placed in the MH-TOT.

Further, in the broadcasting system of this embodiment, as described above, absolute time in NTP format is transmitted, and the broadcast receiving apparatus 100 of this embodiment has a time management function based on the NTP. Furthermore, in the broadcast receiving apparatus 100 of the present embodiment, by referring to the NTP time stamp or the like written in the MPU time stamp descriptor set for each MPU, the decoding timing and presentation time for each presentation unit of the video/audio signal can be determined. controlling the timing. As described above, the NTP format time information has the configuration shown in FIG. 13A. Also, the MPU timestamp descriptor has the configuration shown in FIG. 13B.

For this reason, in the broadcast receiving apparatus 100 of the present embodiment, the "reference_timestamp" parameter, the "transmit_timestamp" parameter, or the "mpu_presentation_time" parameter is referred to, and according to the value of the referred time data, the It is also possible to select which one of the first calculation method and the second calculation method is to be used. That is, for example, if the most significant bit of the 64-bit NTP format time data is "0", the second calculation method is used, and if it is not "0", the first calculation method is used. Do, etc.

By any of the methods described above, it is possible to express dates after "April 23, 2038" in the broadcast receiving apparatus 100 of the present embodiment.

[Channel selection processing of broadcast receiving device (initial scan)]
The AMT of the broadcasting system of this embodiment provides a list of IP packet multicast groups for receiving IP packets transmitted by the TLV multiplexing method and IP packets transmitted over communication lines as indistinguishably as possible. shall be One service identification can list multiple IP multicast groups. Address masks can also be used to efficiently describe consecutive IP addresses.

In the broadcast receiving apparatus 100 of the present embodiment, the list of services acquired from the TLV-NIT is stored in a non-volatile memory such as the ROM 103 or the storage unit 110 at the time of channel scanning at the time of initial setting or at the time of rescanning for setting change. Further, a list of IP multicast groups corresponding to each service can be stored in the non-volatile memory as IP-related information in association with each service. do. By storing the list of services and IP-related information in a non-volatile memory so that they can be referenced at all times, there is no need to re-acquire TLV-NIT and AMT when switching channels, etc., and acquisition of broadcast content can be efficiently performed. can be done.

FIG. 14 is a diagram showing an example of an operation sequence during channel scanning (rescanning) in the broadcast receiving apparatus 100 of this embodiment.

When the channel scan is started, the reception function execution section 1102 sets the initial frequency value to the tuner/demodulation section 131 and instructs it to tune to the frequency value (S101). When the tuner/demodulator 131 successfully locks to the set frequency value (S102: Yes), the reception function execution unit 1102 acquires the TLV-NIT from the received signal (S103).

If the TLV-NIT acquired in the process of S103 is valid data (S104: Yes), the reception function execution unit 1102 acquires information such as the TLV stream ID, original network ID, etc. from the acquired TLV-NIT. (S105). FIG. 15A shows an example of the data structure of TLV-NIT. It is assumed that the information of the TLV stream ID can be obtained from the "tlv_stream_id" parameter, and the information of the original network ID can be obtained from the "original_network_id" parameter. Furthermore, from the distribution system descriptor, obtain the distribution system information on the physical conditions of the broadcast transmission path corresponding to each TLV stream ID/original network ID (S106), and obtain a list of service IDs from the service list descriptor ( S107). An example data structure for a satellite distribution system descriptor is shown in FIG. 15B. FIG. 15C shows an example data structure of a service list descriptor. If the TLV-NIT has a plurality of different data such as the TLV stream ID, original network ID, distribution system information, service ID list, etc., the processing of S105 to S107 is repeated. Next, the reception function execution unit 1102 creates a service list based on the data such as the TLV stream ID, original network ID, distribution system information, and list of service IDs acquired in the processing of S105 to S107. The service list is stored in the ROM 103, the storage unit 110, or the like (updated when rescanning) (S108).

Next, the receiving function executing unit 1102 acquires AMT from the received signal (S109), and further acquires a list of IP multicast groups for each service ID stored in the service list (S110). FIG. 15D shows an example of the data structure of AMT. Note that if the AMT has a list of IP multicast groups for multiple service IDs, the process of S110 is repeated. If there are multiple AMTs having IP multicast group lists for different service IDs, the processing of S109 to S110 is repeated. Next, the reception function execution unit 1102 associates the list of IP multicast groups acquired in the process of S110 with the service ID as IP-related information, and stores it in the ROM 103 or the storage unit 110 (updated when rescanning). (S111).

Note that when the tuner/demodulator 131 does not succeed in locking to the set frequency value in the process of S102 (S102: No), and the TLV-NIT acquired in the process of S103 is not valid data. If so (S104: No), the processing of S105 to S111 is not performed.

After completing the process of S111, the reception function execution unit 1102 ends the process if the frequency value set in the tuner/demodulator 131 is the final frequency value of the channel scan range (S112: Yes). On the other hand, if the set frequency value is not the final frequency value in the channel scan range (S112: No), the frequency value set in the tuner/demodulator 131 is increased (S113), and the processing of S102 to S111 is performed. repeat. In addition, in one TLV-NIT, if it is possible to acquire service IDs for all services that make up the broadcast network, and if it is possible to acquire an AMT having a list of IP multicast groups related to the service IDs, S112 to S113 No processing required.

Through the above-described series of processes, the broadcast receiving apparatus 100 of the present embodiment obtains a list of services constituting the broadcast network (service list) at the time of channel scanning at the time of initial setting or at the time of rescanning for setting change. Simultaneously with creation/updating, a list of IP multicast groups (IP-related information) corresponding to each service is created/updated, and can be stored in a non-volatile memory such as ROM 103 or storage unit 110 .

In addition, rescanning for the above setting change is automatically performed when it detects that there is a change in the information in the table by referring to the "version_number" parameter of TLV-NIT or AMT. can be When a change in the "version_number" parameter of one of the TLV-NIT and AMT is detected, only information relating to the table in which the parameter change is detected may be automatically updated. However, when the aforementioned automatic update is performed, it is desirable to notify the user that rescanning has been automatically performed. Alternatively, the user may be notified that the information in the table has changed, and the user may be allowed to select whether or not to perform the rescan.

[Channel selection processing of broadcast receiving device (channel switching)]
FIG. 16 is a diagram showing an example of an operation sequence at the time of channel selection (channel switching) in the broadcast receiving apparatus 100 of this embodiment.

When the user operates a remote controller (not shown) to instruct channel switching, the reception function execution unit 1102 interprets the command sent from the remote controller and designates the service ID of the desired service (S201). Next, reception function execution section 1102 starts acquiring AMT from the received signal of tuner/demodulation section 131 . If the AMT is successfully acquired within the predetermined time (S202: Yes), information on the IP multicast group list corresponding to the service ID is acquired from the acquired AMT (S204). On the other hand, if the AMT is not successfully acquired within the predetermined time (S202: No), by referring to the IP-related information stored in the ROM 103 or the storage unit 110 (S203), the IP corresponding to the service ID is obtained. Information about the list of multicast groups is obtained (S204). It should be noted that IP-related information stored in the ROM 103, the storage unit 110, or the like may always be referred to without performing the judgment processing of S202.

Next, reception function execution section 1102 starts acquiring TLV-NIT from the received signal of tuner/demodulation section 131 . If the TLV-NIT is successfully obtained within the predetermined time (S205: Yes), the distribution system information for obtaining the IP data flow corresponding to the service ID is obtained from the obtained TLV-NIT (S207). On the other hand, if the acquisition of the TLV-NIT has not succeeded within the predetermined time (S205: No), by referring to the service list stored in the ROM 103 or the storage unit 110 (S206), the service ID corresponding to the Obtain distribution system information for obtaining IP data flow (S207). Alternatively, the service list stored in the ROM 103, the storage unit 110, or the like may always be referred to without performing the judgment processing of S205. After acquiring the distribution system information in the process of S207, the reception function executing unit 1102 next controls the tuner/demodulator 131 using the frequency value indicated by the acquired distribution system information, and obtains the service ID. (S 208 ), extracts an MMT data string from the received IP data flow, and outputs it to the separation unit 132 .

In the separation unit 132, the transport processing unit 1102a acquires the MMTP packet whose packet ID is "0" from the input MMT data string (S209), and further acquires the MPT contained in the acquired MMTP packet. (S210). Next, the transport processing unit 1102a refers to the "MMT_package_id_byte" parameter of the acquired MPT, and confirms whether or not the lower 16 bits of the "MMT_package_id_byte" parameter have the same value as the service ID. In an example of the MPT data structure shown in FIG. 17, when the lower 16 bits of the "MMT_package_id_byte" parameter are the same value as the service ID (S211: Yes), the MMTP packet whose packet ID is "0" It is determined that the packet is an MMTP packet having program data corresponding to the service ID, and MFU acquisition is executed based on the information of the acquired MPT (S216).

On the other hand, if the lower 16 bits of the 'MMT_package_id_byte' parameter are not the same value as the service ID (S211: No), the MMTP packet with the packet ID of '0' contains program data corresponding to the service ID. Judge that it is not a packet. In this case, the transport processing unit 1102a acquires the PLT again (S212), and by confirming the acquired PLT, the packet ID of the MMTP packet for transmitting the MPT having the "MMT_package_id_byte" parameter corresponding to the service ID. (x) is confirmed (S213). Further, the transport processing unit 1102a acquires the MMTP packet whose packet ID is "x" from the input MMT data string (S214), and acquires the MPT contained in the acquired MMTP packet (S215). Furthermore, the MFU is acquired based on the information of the acquired MPT (S216).

It should be noted that the processes of S212 to S215 may be always performed without performing the processes of S209 to S211. In this case, the processing time can be shortened when the program data corresponding to the service ID is stored in an MMTP packet other than packet ID "0".

After acquiring the MFU in the process of S216, the transport processing unit 1102a extracts encoded video data, encoded audio data, and the like from the acquired MFU, and outputs them to the video decoder 141, the audio decoder 143, and the like. Below, video/audio decoding processing under the control of the AV decoding processing unit 1102b and presentation processing under the control of the presentation processing unit 1102h are performed.

Through the series of processes described above, the broadcast receiving apparatus 100 of the present embodiment can perform channel selection (channel switching) operation. In particular, as described with reference to FIGS. 14 and 16, at the time of channel scanning at the time of initial setting or at the time of rescanning for setting change, the service list and IP-related information are created and stored in the ROM 103 and the storage unit. 110 or the like so that it can be referred to at all times, and by referring to the service list and IP-related information stored in the ROM 103 or storage unit 110 or the like in the nonvolatile memory at the time of channel selection (channel switching), It is possible to improve the efficiency of operation during channel selection (channel switching). That is, it is possible to shorten the time from the start of tuning (channel switching) to the end of tuning (channel switching) compared to the case where AMT and TLV-NIT are reacquired at the time of tuning (channel switching). Become.

[Screen layout control of broadcast receiver]
It is assumed that the broadcast receiving apparatus 100 of this embodiment is capable of screen layout control based on the LCT description. FIG. 18 shows an example of the data structure of LCT.

In the figure, especially the "left_top_pos_x" parameter and the "right_down_pos_x" parameter indicate the upper left horizontal position and the lower right horizontal position of the area when the left side of the full screen display is "0" and the right side is "100". Each of them is indicated by a ratio to the total number of pixels in the horizontal direction. The "left_top_pos_y" and "right_down_pos_y" parameters specify the vertical positions of the upper left and lower right of the area when the upper side of the full screen display is "0" and the lower side is "100". Shown as a ratio to the total number of pixels. Also, the "layer_order" parameter indicates the relative position of the region in the depth direction.

An example of allocation of layouts to layout numbers based on the setting of each parameter is shown in FIGS.

FIG. 19A shows the default layout setting of the broadcast receiving apparatus 100 of this embodiment, and is an example in which only one area is set on the full screen. FIG. 19B is an example in which the entire screen is divided into three areas, each of which is designated as "area 0", "area 1", and "area 2". For example, when the number of pixels of the entire screen is 7680 horizontal pixels/4320 vertical pixels, "region 0" has a "left_top_pos_x" parameter of "0", a "left_top_pos_y" parameter of "0", and a "right_down_pos_x" parameter of "80". , and the 'right_down_pos_y' parameter is '80', so it is set within the range of (0, 0)-(6143, 3455). Similarly, "area 1" is set in the range of (6144,0)-(7679,4319), and "area 2" is set in the range of (0,3456)-(6143,4319).

FIG. 19C is an example of setting three regions in the same manner as in FIG. 2” is placed in front of “area 0” according to the setting of the “layer_order” parameter, in the same range as described above. In FIG. 19D, "area 0" is set to device 0 (default device: broadcast receiving apparatus 100 in this embodiment), and "area 1" is set to device 1 (mobile information terminal 700 in this embodiment). This is an example of when

As described above, in the broadcasting system of this embodiment, by using LCT, it is possible to perform screen layout control for displaying multimedia services on the receiver as intended by the service provider.

Fractions below the decimal point generated when the screen is divided according to the set values of parameters such as "left_top_pos_x" may be rounded up or down. Rounding (or rounding off to zero in binary numbers) may be used. For example, the number of pixels in the entire screen is 7680 pixels/vertical 4320 pixels, the 'left_top_pos_x' parameter of 'region 0' is '0', the 'left_top_pos_y' parameter is '0', the 'right_down_pos_x' parameter is '51', and the 'right_down_pos_y' parameter is '51'. parameter is "51", "area 0" may be set in the range of (0, 0)-(3916, 2203) by rounding up, or (0, 0)-(3915, 2203) by rounding down. 2202) may be set to "area 0". Also, in consideration of macroblocks during video compression processing, rounding up/down processing may be performed in units of 8 pixels, 16 pixels, or the like. By the above processing, it is possible to efficiently perform area setting based on LCT and resolution conversion processing of multimedia content in the area.

[Exception processing of screen layout control of broadcast receiving device]
In the broadcast receiving apparatus 100 of the present embodiment, even if the screen layout area control is performed by the above-described LCT, when the user instructs to display the EPG screen, etc., as exception processing, It is assumed that it is possible to perform screen layout control ignoring the description content of the LCT. FIG. 20A shows an example of the operation of exception processing of screen layout control based on LCT.

The same screen layout control as in FIG. 19B is performed by the description of the LCT, the broadcast program video is displayed in "area 0", and the program link data linked to the broadcast program is displayed in "area 1" and "area 2". When the user instructs the display of the EPG screen using a remote controller (not shown) while the content is being displayed, the broadcast receiving apparatus 100 according to the present embodiment displays the LCT description as shown in FIG. 20A(A). Regardless of the content, the screen layout setting is returned to the default setting (that is, the screen layout is controlled in the same manner as in FIG. 19A), and the EPG screen is displayed on the entire screen. Furthermore, when the user gives an instruction to end the display of the EPG screen, the screen layout control is re-executed according to the description contents of the LCT.

By performing the above-described control, the EPG screen can be displayed larger than when the EPG screen is displayed while maintaining the area control of the screen layout as shown in FIG. Visibility can be improved.

Note that the exception processing of the screen layout control is not only applied when displaying the EPG screen, but as shown in FIG. ) may be applied when displaying a child screen or when displaying two screens.

In the case of the recording setting screen shown in FIG. 4A, the display area of the broadcast content is changed from the entire screen to only the child screen portion at the lower right of the screen. Similarly, in the case of the two-screen display shown in FIG. 8B, the display area of the broadcast content is changed from the entire screen to only the split screen portion on the left side of the middle stage of the screen. In either case, the display area for displaying the broadcast content is narrower than when the entire screen is used. It is not preferable visually to display a plurality of broadcast contents at the same time. Therefore, in the broadcast receiving apparatus 100 of the present embodiment, only the broadcast contents of "area 0" are selected and displayed in the display area in the above situation. It is also possible to select and display the broadcast contents of "area 1" or "area 2" according to the immediately preceding area selection state.

By performing the above-described control, it is possible to improve the visibility of the broadcast content compared to displaying various broadcast content while maintaining the area control of the screen layout. The same is true for sub-screen display on the recorded program list screen, Internet content browser display, and the like.

[EPG display of broadcast receiving device]
In the broadcasting system of this embodiment, it is assumed that the MH-EIT transmits time-series information about events (so-called programs) included in each service that constitutes the broadcasting network. FIG. 21 shows an example of the MH-EIT data structure of this embodiment. MH-EIT is identified into two classes by the table ID (corresponding to the "talbe_id" parameter in the figure), and indicates the current/next event information of its own TLV stream and the schedule information of each event of its own TLV stream. shall be possible. The broadcast receiving apparatus 100 of the present embodiment refers to the MH-EIT or the like and performs identification by the service ID (corresponding to the "service_id" parameter in the figure), thereby obtaining information such as the start time and broadcast time of each event. can be acquired to create an EPG screen, and the created EPG can be superimposed on video information or the like by the video synthesizing unit 161 and displayed on the monitor unit 162 .

FIG. 22A is a diagram showing an example of an EPG screen in broadcast receiving apparatus 100 of this embodiment. The EPG screen 162a displays detailed information of a broadcast program broadcast on each channel in each time slot in a matrix form with the vertical axis representing time and the horizontal axis representing service IDs (channels). Further, the detailed information 162a1 of each broadcast program is mainly composed of a title area 162a2 and a detailed description area 162a3.

The title area 162a2 displays the program title of the broadcast program and symbols representing attributes of the broadcast program. The symbol or the like representing the attribute of the broadcast program is, for example, a symbol/character indicating that the program is a new program, a symbol/character indicating that the program is a rebroadcast program, or the like. Alternatively, a mark or the like that symbolizes "data", which means that data broadcasting by a broadcasting service is supported, may be used. Alternatively, a mark 162a4 or the like symbolizing "NetWork", which means that contents, applications, and the like related to the broadcast program can be obtained from the network, may be used. Also, the symbol or the like representing the attribute of the broadcast program may be replaced by differentiating the background color of the detailed information 162a1 from others, or by enclosing the display area of the detailed information 162a1 with a thick frame.

It should be noted that each control information (message, table, descriptor, etc.) in the broadcasting system of the present embodiment indicates that contents, applications, etc. related to the broadcast program can be obtained from the network. However, if the LAN communication unit 121 of the broadcast receiving apparatus 100 is not connected to the LAN cable, or if access to each server apparatus on the network is not possible, the mark 162a4 symbolizing "NetWork" is displayed. etc. may be controlled so as not to be displayed.

In addition, when the broadcast program is a distribution program distributed via the Internet 200 and cannot be acquired only from the broadcast wave, the broadcast receiving device 100 is the same as described above, and each server device on the network 22B, the detailed information 162b1 displayed on the EPG screen 162b may be grayed out as shown in FIG. 22B. That is, control is performed so as not to display detailed information on distribution programs that cannot be viewed. Further, the background color of the detailed information 162b1 may be differentiated from others as an alternative to the grayout processing. When the detailed information 162b1 is selected by operating a remote controller (not shown), the broadcast receiving apparatus 100 is notified that the server apparatus on the network cannot be accessed, or the distributed program associated with the detailed information 162b1 is viewed. The user may be notified of the impossibility by pop-up or the like.

Through the above-described controls, the broadcast receiving apparatus 100 can provide program information of each broadcast program in a form that does not give the user a sense of discomfort, depending on the network connection status.

FIG. 22C is a diagram showing another example of the EPG screen in the broadcast receiving apparatus 100 of this embodiment. In the figure, "M1 TV", "M2 Broadcast", "M3 Channel", "M4TV", "TV M5", etc. are the names of broadcasting stations for each channel. It is assumed that the broadcast program to be distributed and the distribution program to be distributed via the Internet 200 (information 162c1 in the frame indicated by "net broadcasting" in the figure) are provided simultaneously.

As shown in the figure, when there is a channel having only a distribution program distributed via the Internet 200, normally all channels (including information 162c1) are displayed as shown in the EPG screen 162c of the figure (A). control to display the information of On the other hand, when the broadcast receiving device 100 cannot access each server device on the network, etc., as shown in the EPG screen 162d in FIG. It may be controlled not to display the information of the channel of "M2 broadcasting (net broadcasting)" (information 162c1 in FIG. 4A).

Through the above-described controls, the user of the broadcast receiving apparatus 100 can eliminate the need to confirm information on channels that he or she cannot view.

[Emergency warning broadcast display on broadcast receiver]
The broadcast receiving apparatus 100 of the present embodiment performs emergency warning broadcast reception processing when the emergency warning broadcast activation control signal bit of the TMCC signal included in the transmission data including the TLV stream changes from "0" to "1". It shall be possible to do so.

The emergency warning broadcast may be provided as a full-screen display application, or may be provided as character information in superimposed text. When the emergency warning broadcast is provided in superimposed text as text information, it is preferable to display the superimposed text information regardless of the state of the broadcast receiving apparatus 100 immediately before receiving the emergency warning broadcast. That is, as shown in FIG. 23, when the user watches a normal broadcast program and receives an emergency warning broadcast while the program screen 162e of the broadcast program is displayed on the monitor unit 162, the emergency warning broadcast The character information 162e1 is superimposed on the program screen 162e and displayed. Similarly, when the user instructs the display of the EPG screen and an emergency warning broadcast is received while the EPG screen 162f is being displayed on the monitor unit 162, the character information 162f1 from the emergency warning broadcast is superimposed on the EPG screen 162f. control to display

With the above-described control, in the broadcast receiving apparatus 100 of the present embodiment, even when the user selects and displays an EPG screen, various setting screens, a recorded program list screen, an Internet browser, or the like, the emergency warning broadcast can be performed. is received, it is possible to avoid overlooking important character information based on the emergency warning broadcast. Note that this control may be performed on normal superimposed character information that is not based on the emergency warning broadcast.

[Various exception handling]
When the broadcast receiving apparatus 100 of the present embodiment cannot acquire data outside the TLV stream within the same package, for example, the following exception processing may be performed.

As described in FIG. 6E, in the broadcasting system to which the broadcast receiving apparatus 100 of this embodiment corresponds, based on the location information stored in the MPT (corresponding to "MMT_general_location_info ()" in FIG. 17), in the TLV stream The data to be acquired and the data to be acquired through paths other than the TLV stream can be included in the same package. However, the data transmission path other than the TLV stream indicated by the location information (eg, IPv4 data flow, IPv6 data flow, MPEG2-TS for broadcasting, etc.) is a reception function different from the TLV/MMT stream reception function. Therefore, even when the broadcast receiving apparatus 100 is in operation, a situation in which the reception function of these transmission paths is not in operation, a situation in which the reception function itself is in operation but a relay device or the like is not in operation, or a situation in which these Data may not be obtained from these transmission paths, such as situations where the transmission paths are not wired or wirelessly connected, or situations where the broadcast receiving apparatus 100 is installed in an environment where these transmission paths cannot be connected in the first place. .

Under such circumstances, an event indicating that the location information stored in the MPT associates data acquired within the TLV stream and data acquired through a path other than the TLV stream so as to be included in the same package. When receiving, the broadcast receiving apparatus 100 of this embodiment may perform, for example, the following operations.

For example, as shown in FIG. 19B and FIG. 19C, the LCT sets a plurality of areas in the screen, displays the video contained in the TLV stream in "area 0", and displays "area 1" and "area 2 ] is associated so that the data acquired by the transmission path other than the TLV stream is displayed, and the data of the transmission path other than the TLV stream to be displayed in "area 1" or "area 2" is If it cannot be obtained, the layout display of the multiple areas specified by the LCT may be prohibited. Specifically, even if the LCT is received, the image of the content received in the TLV stream is displayed in "area 0" of the default layout display shown in FIG. It is sufficient not to shift to the layout display of multiple areas. Furthermore, in this state, even if an instruction to change from the default layout to the layout indicated by the LCT is input to the operation input unit 170 in FIG. 7A, the default layout display shown in FIG. 19B or 19C so as not to shift to the layout display of a plurality of areas as shown in FIG. 19B or 19C.

LCT, as shown in FIG. 19B and FIG. 19C, has set multiple areas in the screen, displays the video contained in the TLV stream in "area 0", and displays in "area 1" and "area 2" When the data is associated so that the data acquired by the transmission path other than the TLV stream is displayed, and the data of the transmission path other than the TLV stream to be displayed in "area 1" or "area 2" cannot be acquired. 19B and 19C indicated by the LCT is once displayed, and the background color and a predetermined still image are displayed for "area 1" and "area 2". However, if the transmission path data other than the TLV stream indicated by the location information of the MPT cannot be obtained even after a predetermined time has passed, the display may be switched back to the default layout display state shown in FIG. 19A. In this case, even when the layouts of FIGS. 19A, 19B, and 19C are changed, if the program image contained in the TLV stream is continuously displayed in "area 0", the user's program image itself can be displayed. is preferred because it continues.

In addition, since the data of the transmission path other than the TLV stream to be displayed in "area 1" and "area 2" cannot be acquired, the content received in the TLV stream in "area 0" of the default layout display shown in FIG. 19A , the operation of various communication functions and various reception functions of the broadcast receiving apparatus 100 of the present embodiment is started, the communication environment of various communication functions, the communication status, and various reception functions are changed. Due to changes in the reception environment and reception conditions, there may be situations where data on transmission paths other than the TLV stream to be displayed in "area 1" and "area 2" can be acquired. In this case, the broadcast receiving apparatus 100 of the present embodiment immediately switches from the default layout display shown in FIG. 19A to the layout of multiple areas as shown in FIG. 19B and FIG. The image of the content received in the stream may be displayed, and the data acquired from the transmission path other than the TLV stream may be displayed in "area 1" or "area 2". Alternatively, the layout may not be changed immediately, but after an instruction to change from the default layout to the layout indicated by the LCT is input from the operation input unit 170, the layout may be changed.

[Copyright protection function]
In the digital broadcasting system to which the broadcast receiving apparatus 100 of the present embodiment is compatible, by transmitting copy control information in the MPT, for example, the copy control information can be used for "unlimited copying"("unlimited copying and storage and encryption processing required at the time of output” and “unlimited copying allowed and no encryption processing required at the time of storage and output”), “only one generation copy allowed”, “predetermined number of copies allowed” ( For example, it may be configured to indicate and transmit the copy control state of the content referred to by the MPT, such as so-called "dubbing 10" if 9 copies allowed + 1 move allowed) or "copy prohibited". In this case, according to the copy control information, the broadcast receiving apparatus 100 of the present embodiment accumulates the content in the storage (accumulation) unit 110, records it in the removable recording medium, outputs it to the external device, and transfers it to the external device. It may be configured to control copy, move processing to an external device, and the like. Note that the target of the accumulation process is not limited to the storage (accumulation) unit 110 inside the broadcast receiving apparatus 100, but may include records subjected to protection processing such as encryption so that they can be reproduced only by the broadcast receiving apparatus 100. . Specifically, among the external recording devices, etc., the target of the accumulation process includes those that have been made recordable and reproducible only by the broadcast receiving device 100 .

A specific example of processing based on the copy control information will be described below.

First, when the copy control information included in the MPT indicates "unlimited copying", the broadcast receiving apparatus 100 of the present embodiment performs accumulation in the storage (accumulation) section 110, recording in a removable recording medium, external device output to external devices, copy to external devices, and move processing to external devices can be performed without restrictions. However, if "Unlimited copying is allowed and encryption is required for storage and output" and "Unlimited copying is allowed and encryption is not required for storage and output", "Unlimited copying is allowed and storage and output are not required" When "encryption processing is required at times", the number of times of storage in the storage (accumulation) unit 110, recording on a removable recording medium, output to an external device, copying to an external device, and moving to an external device is limited. However, in either case, it is necessary to perform encryption processing.

Further, when the copy control information included in the MPT indicates "only one generation can be copied", the broadcast receiving apparatus 100 of the present embodiment enables encrypted storage in the storage (storage) unit 110. When the stored content is output to an external device for viewing, it is encrypted together with the copy control information of "copy prohibited" and output. However, a so-called move process to an external device (a process of copying the content to the external device and rendering the content in the storage (accumulation) unit 110 of the broadcast receiving apparatus 100 unreproducible by erasing processing or the like) is allowed.

Further, when the copy control information included in the MPT indicates that "predetermined number of copies are permitted", the broadcast receiving apparatus 100 of the present embodiment enables encryption and accumulation in the storage (accumulation) section 110. When the stored content is output to an external device for viewing, it is encrypted together with the copy control information of "copy prohibited" and output. However, it may be possible to perform a predetermined number of copy and move processes to an external device. In the case of the so-called "Dubbing 10" rule, nine copies to the external device and one move may be performed.

Also, when the copy control information included in the MPT indicates “copy prohibited”, the broadcast receiving apparatus 100 of the present embodiment prohibits copying to the storage (accumulation) section 110 . However, the broadcast receiving apparatus 100 stores the storage (accumulation) unit 110 only for a predetermined time or a predetermined time specified by control information (for example, by the MH-Expire descriptor shown in FIG. 6D) included in the broadcast signal. In the case of configuring so as to have a "temporary storage" mode that enables storage in the storage (accumulation) unit 110, even if the copy control information included in the MPT indicates "copy prohibited", Temporary retention of the content is made possible. When the content whose copy control information included in the MPT is "copy prohibited" is output for viewing to an external device, it is encrypted together with the copy control information "copy prohibited" and output.

The output for viewing to the external device described above may be performed via the video output unit 163 and the audio output unit 166 in FIG. 7A, the digital I/F unit 125, the LAN communication unit 121, or the like. The copy or move processing to the external device described above may be performed via the digital I/F unit 125, the LAN communication unit 121, or the like in FIG. 7A.

According to the processing described above, appropriate content protection can be realized according to the copy control information associated with the content.

In addition, copy processing of content for which the copy control information indicates a copy restriction such as "only one generation copy allowed", "predetermined number of copies allowed", or "copy prohibited" to an external device via the LAN communication unit 121. is possible only when the IP address of the external device, which is the destination of the transmission packet from the broadcast receiving device 100, is in the same subnet as the IP address of the broadcast receiving device 100, and the IP address of the external device is the broadcast receiving device. If it is outside the same subnet as 100 IP addresses, it may be prohibited. Contents whose copy control information is "Unrestricted copying is permitted and encryption processing is required at the time of storage and output" may be handled in the same manner.

Similarly, content whose copy control information indicates copy restrictions, such as "one generation copy only", "predetermined number of copies allowed", "unlimited copy allowed and encryption processing required for storage and output", is After storing in the storage (accumulation) unit 110, in the process of moving to the external device via the LAN communication unit 121, the IP address of the external device, which is the destination of the transmission packet from the broadcast receiving device 100, is the IP address of the broadcast receiving device 100. However, if the IP address of the external device is outside the same subnet as the IP address of the broadcast receiving apparatus 100, it may be prohibited.

In principle, viewing video output and audio output of the content stored in the storage (accumulation) unit 110 of the broadcast receiving apparatus 100 are performed when the IP address of the external device, which is the destination of the transmission packet from the broadcast receiving apparatus 100, is used for the broadcast reception. It is possible only when it is in the same subnet as the IP address of the device 100, and it is prohibited when the IP address of the external device is out of the same subnet as the IP address of the broadcast receiving device 100. However, the external device is connected within the same subnet as the IP address of the broadcast receiving device 100 within a predetermined period, and is registered as a device that can be viewed even outside the same subnet as the IP address of the broadcast receiving device 100. In the case of a (paired) device, even if the IP address of the external device is outside the same subnet as the IP address of the broadcast receiving device 100, storage (accumulation) of the broadcast receiving device 100 in the external device The content stored in the unit 110 may be configured to enable viewing video output and audio output. In this case, the viewing video output and audio output are performed by encrypting the contents.

According to the processing described above, by performing different processing according to whether the external device is within the same subnet as the IP address of the broadcast receiving apparatus 100 or outside the same subnet, both user convenience and content protection are achieved. can be realized.

Next, as described in FIG. 6E, in the digital broadcasting system to which the broadcast receiving apparatus 100 of the present embodiment is compatible, the location information in the MPT (“MMT_general_location_info ( )” in FIG. 17) is used in the TLV stream of the broadcast path. Data obtained by a different route (IPv4, IPv6, MPEG2-TS, URL, etc.) from the obtained data may be included in the same package and the same event as the data obtained by the TLV stream, but at this time it is copied to the MPT. Describe content protection when control information is included.

First, when copy control information is included in the MPT, the data included in the same package and the same event in the location information must have a different path (IPv4, IPv6, MPEG2-TS, URL, etc.) from the data acquired in the TLV stream of the broadcast path. ) may be controlled according to the copy control information included in the TLV stream. As described above, the copy control statuses of the content specified by these pieces of copy control information are "unlimited copying allowed" ("unlimited copying allowed and encryption processing required at storage and output" and "unlimited copying allowed"). and no encryption processing is required at the time of storage and output”), “only one generation can be copied”, and “predetermined number of copies are allowed” (for example, if nine copies are allowed + one move is allowed, the so-called “ Dubbing 10”), “copy prohibition”, etc. can be specified.

Here, if the position of the data indicated by the location information includes MPEG2-TS data transmitted by another digital broadcasting signal, the MPEG2-TS data is also associated with the copy control information of the other digital broadcasting signal. are being broadcast. Then, according to which information and how to perform copy control of the MPEG2-TS data (whether according to the copy control information included in the TLV/MMT stream or according to the copy control information included in MPEG2-TS) becomes a problem. .

In the digital broadcasting system of the present embodiment, as a solution to this problem, the broadcast receiving apparatus 100 may perform any one of the following solutions.

<Operation example 1>
In the first operation example, when MPT contains copy control information and location information contains MPEG2-TS data transmitted by another digital broadcasting signal in the same package and in the same event, MPEG2- The copy control state indicated by the copy control information included in the TLV stream is given priority over the copy control state indicated by the copy control information included in the TS.

For example, the copy control status indicated by the copy control information included in the TLV stream is "one generation copy allowed", and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined multiple copies allowed". If so, even if the data is acquired through a route (digital broadcasting in MPEG2-TS transmission format) different from that acquired through the TLV stream, copy control may be performed as the content of "1st generation copy permitted". For example, the copy control status indicated by the copy control information included in the TLV stream is "unlimited copying allowed", and the copy control status indicated by the copy control information included in the MPEG2-TS is "predetermined multiple copies allowed". If so, even if the data is acquired through a route (digital broadcasting in MPEG2-TS transmission format) different from that acquired through the TLV stream, copy control may be performed as "unlimited copying" content.

In the case of this operation, it is possible to put the data acquired through a path other than the TLV stream into a copy state desired to be managed in the broadcasting system supported by the broadcast receiving apparatus 100 of the present embodiment.

<Operation example 2>
In the second operation example, when the copy control information is included in the MPT and the data included in the same package and the same event in the location information includes MPEG2-TS data transmitted by another digital broadcasting signal, the TLV stream compare the copy control state indicated by the copy control information included in the MPEG2-TS with the copy control state indicated by the copy control information included in the MPEG2-TS, and determine the copy control state indicated by the copy control information included in the MPEG2-TS. is stricter than the copy control state indicated by the copy control information included in the TLV stream, storage processing to the storage (accumulation) unit 110, recording processing to a removable recording medium, or output processing from a digital interface At this time, the MPEG2-TS data is excluded from the contents to be processed.

In the case of this operation, for data acquired through a route other than the TLV stream, while respecting the original copy control information set in the broadcasting system that transmits the data, the broadcast receiving apparatus 100 of the present embodiment copies the data. Duplication of control states can be eliminated.

Also, as a result of the comparison, if the copy control state indicated by the copy control information included in the MPEG2-TS is the same state as the copy control state indicated by the copy control information included in the TLV stream or is in a looser copy control state In other words, MPEG2-TS data included in the same package and in the same event with the location information may be copy-controlled as content in the copy-controlled state indicated by the copy control information included in the TLV stream.

In the case of this operation, for data acquired through a route other than the TLV stream, while respecting the original copy control information set in the broadcasting system that transmits the data, the broadcast receiving apparatus 100 of the present embodiment copies the data. Duplication of control states can be eliminated.

In the above explanation, the copyright protection function of the broadcast receiving apparatus 100 of this embodiment is explained as being performed based on the copy control information included in the MPT. However, the table in which copy control information is arranged is not limited to MPT. In addition to the MPT, the MH-service description table (MH-SDT) and MH-event information table (MH-EIT) described in FIG. 6B, or other tables are placed and transmitted, and the broadcast receiving apparatus 100 follows these tables. Copyright protection processing may be performed.

According to the present embodiment described above, it is possible to provide a broadcast receiver compatible with MMT digital broadcasting.
(Example 2)

A second embodiment of the present invention will be described below. It should be noted that the configuration, processing, effects, etc. of this embodiment are the same as those of the first embodiment unless otherwise specified. Therefore, the differences between the present embodiment and the first embodiment will be mainly described below, and descriptions of common points will be omitted as much as possible to avoid duplication. Also, the broadcast receiving apparatus of this embodiment will be described below assuming that it is a television receiver compatible with both the MMT system and the MPEG2-TS system as media transport systems.

[Hardware Configuration of Broadcast Receiver]
FIG. 24 is a block diagram showing an example of the internal configuration of broadcast receiving apparatus 800. As shown in FIG. Broadcast receiver 800 includes main control unit 801, system bus 802, ROM 803, RAM 804, storage unit 810, LAN communication unit 821, expansion interface unit 824, digital interface unit 825, first tuner/demodulator 831, second tuner/ demodulation unit 832, MMT decoding processing unit 841, MPEG2-TS decoding processing unit 842, video synthesis unit 861, monitor unit 862, video output unit 863, audio synthesis unit 864, speaker unit 865, audio output unit 866, operation input unit 870 , consists of

Main control unit 801, system bus 802, ROM 803, RAM 804, storage unit 810, expansion interface unit 824, digital interface unit 825, monitor unit 862, video output unit 863, speaker unit 865, audio output unit 866, operation input unit 870, etc. are the main control unit 101, the system bus 102, the ROM 103, the RAM 104, the storage unit 110, the expansion interface unit 124, the digital interface unit 125, the monitor unit 162, and the video output unit 163 in the broadcast receiving apparatus 100 of the first embodiment. , the speaker unit 165, the audio output unit 166, the operation input unit 170, etc., and detailed description thereof will be omitted.

The first tuner/demodulator 831 receives broadcast waves of a broadcast service adopting MMT as a media transport method via an antenna (not shown), and selects a service desired by the user based on the control of the main controller 801. Tune (tune) to the channel of Furthermore, the first tuner/demodulator 831 demodulates the received broadcast signal to obtain an MMT data string, and outputs it to the MMT decoding processor 841 . The second tuner/demodulator 832 receives broadcast waves of a broadcast service that employs MPEG2-TS as a media transport method via an antenna (not shown), and, based on the control of the main control unit 801, reproduces the signals desired by the user. Tune in (tune) to the channel of the service you want. Furthermore, the second tuner/demodulator 832 demodulates the received broadcast signal to acquire an MPEG2-TS data string and outputs it to the MPEG2-TS decoding processor 842 .

The MMT decoding processing unit 841 receives the MMT data string output from the first tuner/demodulation unit 831, and converts video data string, audio data string, Separation processing such as text superimposition data string, caption data string, etc., decoding processing, etc. are performed. The MMT decoding processing unit 841 includes the separation unit 132, the video decoder 141, the video color gamut conversion unit 142, the audio decoder 143, the text super decoder 144, the subtitle decoder 145, the subtitle synthesizing unit 146, Functions corresponding to the subtitle color gamut conversion unit 147, the data decoder 151, the cache unit 152, the application control unit 153, the browser unit 154, the application color gamut conversion unit 155, the sound source unit 156, and the like are provided. The MMT decoding processing unit 841 can perform various types of processing described in the first embodiment. The details of the various processes are the same as those described in the first embodiment, so descriptions thereof will be omitted.

The MPEG2-TS decoding processing unit 842 receives the MPEG2-TS data string output from the second tuner/demodulation unit 832, and converts video data, which is a real-time presentation element, based on the control signal included in the MPEG2-TS data string. It performs separation processing, decoding processing, and the like for strings, audio data strings, superimposed character data strings, caption data strings, and the like. The MPEG2-TS decoding processing unit 842 has the same function as the IRD (Integrated Receiver Decoder) unit of a conventional television receiver that receives broadcast waves of broadcasting services that employ MPEG2-TS as a media transport method. Detailed description is omitted.

The video synthesizing unit 861 receives the video information, subtitle information, and application information output from the MMT decoding processing unit 841, and the video information, subtitle information, and application information output from the MPEG2-TS decoding processing unit 842, Processing such as selection and/or superimposition is performed as appropriate. The video synthesizing unit 861 includes a video RAM (not shown), and the monitor unit 862 and the like are driven based on the video information and the like input to the video RAM. Also, the video synthesizing unit 861 performs scaling processing, EPG screen information superimposing processing, etc., as necessary, based on the control of the main control unit 801 . The audio synthesizing unit 164 receives the audio information output from the MMT decoding processing unit 841 and the audio information output from the MPEG2-TS decoding processing unit 842, and appropriately performs processing such as selection and/or mixing.

The LAN communication unit 821 is connected to the Internet 200 via the router device 200r, and transmits and receives data to and from each server device on the Internet 200 and other communication devices. Also, the MMT data string (or part thereof) and MPEG2-TS data string (or part thereof) of the program transmitted via the communication line are acquired, and the MMT decoding processing unit 841 and MPEG2-TS are acquired as appropriate. Output to the decoding processing unit 842 .

[Time display of broadcast receiver]
In the broadcast receiving apparatus 800 of this embodiment, it is assumed that the current date and current time can be displayed on the EPG screen, various setting screens, and the like. The information about the current date and current time is transmitted by MH-TOT or the like in a broadcasting service adopting MMT as a media transport method, and is transmitted by MPEG-TOT in a broadcasting service adopting MPEG2-TS as a media transport method. TOT (Time Offset Table) included in SI (Service Information) defined in the 2 system. Broadcast receiving apparatus 800 can acquire information about the current date and current time by referring to MH-TOT and TOT.

Generally, when the video synthesizing unit 861 mainly selects the video information output from the MMT decoding processing unit 841, the information about the current date and the current time obtained from the MH-TOT is When superimposed on video information and the like, and when the video synthesizing unit 861 mainly selects the video information and the like output from the MPEG2-TS decoding processing unit 842, the information on the current date and the current time obtained from the TOT is Control may be performed so as to be superimposed on video information or the like.

However, there are differences in encoding/decoding processes and transmission paths between broadcasting services that use MMT as a media transport method and broadcasting services that use MPEG2-TS as a media transport method. , there is a possibility that inconsistency may occur between the selection of a broadcasting service that employs MMT as the media transport scheme and the selection of a broadcasting service that employs MPEG2-TS as the media transport scheme. For example, as shown in FIG. 25, an EPG screen 162g displaying channel information of a broadcasting service adopting MMT as a media transport method is changed to an EPG screen 162g displaying channel information of a broadcasting service adopting MPEG2-TS as a media transport method. When the screen display is switched to the screen 162h, the inconsistency caused by the switching of the display of the current time from the current time display 162g1 to the current time display 162h1 may cause a visual discomfort to the user.

In the broadcast receiving apparatus 800 of the present embodiment, even when the video synthesizing unit 861 mainly selects the video information or the like output from the MMT decoding processing unit 841, in order to prevent the user's visual discomfort. , the information relating to the current date and the current time obtained from the TOT is superimposed on the video information or the like. That is, control is performed to superimpose the current time information provided by the broadcasting service adopting MPEG2-TS as the media transport method on the contents of the broadcasting service adopting MMT as the media transport method.

By performing the above control, the broadcast receiving apparatus 800 of this embodiment always displays the current time information obtained by referring to the TOT when displaying the current time. Therefore, even when switching between a broadcasting service adopting MMT as a media transport method and a broadcasting service adopting MPEG2-TS as a media transport method, the user will feel a visual discomfort due to inconsistency in the display of the current time. It is possible to prevent

FIG. 26A shows an example of selection control of the current time information reference source according to the reception status of each broadcast service in the broadcast receiving apparatus 800 of this embodiment. In the broadcast receiving apparatus 800 of the present embodiment, when it is possible to receive a broadcast service adopting MPEG2-TS as a media transport method, the TOT is always referenced to acquire the current time information. , the MH-TOT only when reception of broadcast services adopting MPEG2-TS as a media transport method is disabled and reception of broadcast services adopting MMT as a media transport method is possible. to get the current time information.

Contrary to the control described above, the current time information provided by the broadcasting service adopting MMT as the media transport method is superimposed on the content of the broadcasting service adopting MPEG2-TS as the media transport method. Even if it is controlled, the same effect as described above can be obtained.

As described above, when controlling to superimpose the current time information provided by the broadcasting service adopting MPEG2-TS as the media transport method on the content of the broadcasting service adopting MMT as the media transport method. and control to superimpose the current time information provided by the broadcasting service adopting MMT as the media transport method on the contents of the broadcasting service adopting MPEG2-TS as the media transport method. , the current time information can be corrected by referring to the "delta" parameter of the time information in the TMCC extension information area, in the same manner as described in [Time management of broadcast receiving device] in Embodiment 1. It is possible.

Also, in both the broadcasting service adopting MMT as the media transport method and the broadcasting service adopting MPEG2-TS as the media transport method, MH-TOT or TOT transmitted by each broadcasting service constituting the network is It is conceivable that there may be an error due to a malfunction of the transmission side system or a transmission error. In the broadcast receiving apparatus 800 of the present embodiment, as a countermeasure against the MH-TOT or TOT error, if it is determined that the MH-TOT or TOT acquired from the service being received has an error, other than the same network MH-TOT or TOT from the broadcasting service of another network or from any broadcasting service of another network, and refer to the current time information to update the time information of the built-in clock. and

FIG. 26B shows an example of update processing of the current time information when receiving a broadcast service adopting MPEG2-TS as the media transport method in the broadcast receiving apparatus 800 of this embodiment. It should be noted that even when receiving a broadcast service that employs MMT as a media transport method, processing similar to that shown in the figure is possible.

When updating the time information of the built-in clock in the broadcast receiving apparatus 800 of the present embodiment, first, the receiving function execution unit 1102 receives MPEG2 - Acquire the TOT from the TS data string (S301), and acquire current time information by referring to the acquired TOT (S302). Next, the reception function execution unit 1102 performs processing for comparing the current time information acquired in the processing of S302 and the time information of the built-in clock.

As a result of the comparison process, if the difference between the current time information acquired in the process of S302 and the time information of the internal clock is within a predetermined value (for example, within 3 minutes) (S303: Yes), the reception function execution unit 1102 The time information of the built-in clock is updated using the current time information acquired in the process of S302 (S306). On the other hand, as a result of the comparison process, if the difference between the current time information acquired in the process of S302 and the time information of the internal clock is not within a predetermined value (S303: No), or if the TOT acquired in S301 is included in the data If there is a flag or the like indicating that there is an error, the reception function execution unit 1102 acquires the TOT from the MPEG2-TS data string of another broadcast service in the same network, or obtains the TOT from any other network. MH-TOT is obtained from the MMT data string of a broadcast service (broadcast service adopting MMT as a media transport method) (S304), and current time information is obtained from the obtained TOT or MH-TOT (S305). . The reception function execution unit 1102 may perform the comparison process of S303 again using the current time information acquired in the process of S305.

By the above processing, the broadcast receiving apparatus 800 of the present embodiment determines that the MH-TOT or TOT acquired from the service being received has an error, from another broadcast service on the same network, or from another broadcast service. By obtaining the MH-TOT or TOT from any broadcast service on the network and referring to the current time information, it is possible to update the time information of the built-in clock.

If it is not possible to acquire the current time information within a predetermined range from the time information of the built-in clock by repeating the processing of S304 to S305, such as during initial setting after shipment from the factory, the current time information is acquired by the processing of S302. The time information of the built-in clock may be set again using the current time information. By doing so, it is possible to cope with the case where there is an error in the time information side of the built-in clock of the broadcast receiving apparatus 800 of this embodiment.

[EPG display of broadcast receiving device]
Event schedule information of broadcasting services adopting MMT as a media transport method is transmitted by MH-EIT or the like. On the other hand, event schedule information of broadcasting services adopting MPEG2-TS as a media transport method is transmitted by EIT (Event Information Table) provided in SI defined in the MPEG-2 system. Therefore, in general, when displaying video information provided by a broadcasting service that employs MMT as a media transport method, event schedule information (MH-EIT) of the broadcasting service that employs MMT is displayed. ) can be acquired, and when displaying video information, etc., provided by a broadcasting service that employs MPEG2-TS as a media transport method, the event schedule information of the broadcasting service that employs MPEG2-TS (EIT) can be obtained.

However, the broadcast receiving apparatus 800 of the present embodiment can display video information and the like provided by a broadcasting service that employs MMT as a media transport method, or even when MPEG2-TS is used as a media transport method. Both the MH-EIT and the EIT can be acquired even when displaying video information provided by a broadcasting service employing .

FIG. 27A shows an example of an EPG screen in broadcast receiving apparatus 800 of this embodiment. In the figure, an EPG screen 162i is an EPG screen created based on MH-EIT of a broadcasting service adopting MMT as a media transport method, and includes "M1 TV", "M2 Broadcast", "M3 Channel", "M4 TV , “Television M5”, etc. are the names of broadcasting stations of broadcasting services that employ MMT as a media transport method. The EPG screen 162j is an EPG screen created based on the EIT of a broadcasting service that employs MPEG2-TS as a media transport method, and includes "T6 TV", "T7 Broadcast", "T8 Channel", and "T9 TV". , “Television TA” and the like are the names of broadcasting stations of broadcasting services that employ MPEG2-TS as the media transport method.

For example, while a user is watching a broadcast program provided by a broadcasting service that employs MMT as a media transport method, if a remote controller (not shown) is operated to instruct display of an EPG screen, an initial screen (shown in the figure) of the EPG screen is displayed. omitted) is displayed. The initial screen of the EPG screen is an EPG screen created based on MH-EIT of a broadcasting service adopting MMT as a media transport method. (neighborhood of current time)” is displayed. Next, the user desires to check the detailed information of the broadcast program of each channel on "October 9, 2014" from "20:00", and instructs to update the EPG screen by operating the remote controller (not shown). Then, the EPG screen 162i is displayed.

Furthermore, when the user desires to check detailed information about broadcast programs provided by a broadcasting service that employs MPEG2-TS as a media transport method, and instructs network switching by operating a remote controller (not shown), EPG Screen 162j is displayed. At this time, in the broadcast receiving apparatus 800 of the present embodiment, the initial screen of the EPG screen created based on the EIT of the broadcast service adopting MPEG2-TS as the media transport method (that is, "October 7, 2014 (detailed information of the broadcast program of each channel from "17 o'clock"), but the same day and time zone as the EPG screen 162i displayed immediately before (that is, "from 20 o'clock ]) to display the detailed information of the broadcast program of each channel.

With the above-described control, the user can continuously confirm detailed information about broadcast programs on the same day and at the same time on a plurality of networks with different media transport methods with a simple operation. That is, the usability of the broadcast receiving apparatus 800 is improved.

FIG. 27B is a diagram showing a different example of the EPG screen in broadcast receiving apparatus 800 of this embodiment. The EPG screen 162k shows a state in which the EPG screen 162i shown in FIG. 27A is displayed and scrolled in the channel direction (horizontal direction) by operating a remote controller (not shown). That is, in the example shown in FIG. 27B, by scrolling the EPG screen in the channel direction (horizontal direction), channel information and media created based on MH-EIT of a broadcasting service adopting MMT as a media transport method can be displayed. The channel information created based on the EIT of the broadcasting service adopting MPEG2-TS as the transport method is seamlessly displayed on the same time axis.

Therefore, while the user confirms the channel information created based on the MH-EIT of the broadcasting service adopting MMT as the media transport method, the channel information created based on the EIT of the broadcasting service using MPEG2-TS as the media transport method is Even when the user desires to check the received channel information, it is possible to eliminate the need for instructing network switching by operating a remote controller (not shown). Furthermore, the user can simultaneously confirm detailed information about broadcast programs on the same day and at the same time on a plurality of networks with different media transport methods. That is, the usability of the broadcast receiving apparatus 800 is improved.
(Example 3)

A third embodiment of the present invention will be described below. It should be noted that the configuration and effects of this embodiment are the same as those of Embodiments 1 and 2 unless otherwise specified. Therefore, in the following, differences between the present embodiment and Embodiments 1 and 2 will be mainly described, and descriptions of common points will be omitted as much as possible to avoid duplication. In this embodiment, handling of presentation area information set by the layout setting table (LCT) shown in FIG. 18 will be described.

[Hardware Configuration of Broadcast Receiver]
Since the hardware configuration of the broadcast receiving apparatus 100 is the same as that of the first embodiment, description thereof is omitted.

[Program data structure]
FIG. 28 shows the structure of program data. The program data consists of information (asset 30003) to be presented to the broadcast receiving apparatus 100, such as video, audio, and program link information, and control information. Note that the program link information stores character information, graphic information, image information, video information, etc. for presentation in accordance with the program video. FIG. 28 shows a PA message 30000 describing the presentation method and acquisition source information of the asset 30003 among the control information. The acquisition destination of the asset 30003 is described as MMT_general_location_info (FIG. 31) in the MP table (MPT) 30001 (FIG. 17) in the PA message 30000 (FIG. 30). Also, in the PA message 30000, a layout setting table (LCT) 30100 (FIG. 18) is arranged to describe the layout of the area where each asset 30003 should be presented. Examples of presentation area layouts are shown in FIGS. 19A-19D.

A package list table (PLT) 30002 (FIG. 32) can be placed in the PA message 30000, and the acquisition destination of another PA message 30000 can be described by MMT_general_location_info (FIG. 31) in the PLT. By specifying the acquisition destination of the PA message 30000, the PA message 30000 can have a hierarchical structure. FIG. 33 shows the location types of acquisition destinations of the PA message 30000 and assets 30003 .

Normally, the hierarchical structure of the PA message 30000 is up to two hierarchies as shown in FIG. 28, but it is also possible to add PLTs 30002 to the PA message 30000 of the second hierarchy to increase the hierarchy.

Assets are composed of Media Processing Units (MPUs), which are processing units (Fig. 29). specify. The MPU presentation area specification descriptor is placed in the asset descriptor area of the MPT. Since the presentation area is designated for each MPU, a presentation method is also possible in which the presentation area of the same asset 30003 is changed during presentation. In addition, in order to reduce the amount of data, the presentation area is not specified for all MPUs belonging to the asset, and only the presentation area of the first MPU and the first MPU of the MPU group whose presentation area is to be changed is specified. A control method is also possible.

[Operation example of asset presentation]
<Operation example 1>
Broadcast receiving apparatus 100 acquires presentation area information by reading LCT 30100 . FIG. 16 shows a flow in which the broadcast receiving apparatus 100 acquires program control information as an example of channel switching. Like MPT 30001, LCT 30100 is placed in an MMTP packet and transmitted. Since MPT 30001 describes information specifying the presentation area of asset 30003 , LCT 30100 is preferably acquired prior to MPT 30001 . As shown in FIG. 16, it is preferably acquired as steps between S209 and S210 and between S214 and S215. It should be noted that it is similarly preferable if the LCT can be obtained before S216 even if it cannot be obtained at the timing described above.

The LCT 30100 is placed in the PA message 30000, but the LCT 30100 related to the asset 30003 corresponding to the second layer PA message is placed in the first layer PA message 30000 or the second layer PA message 30000. do. In presenting the asset 30003, the presentation area information of the LCT 30100 arranged in the PA message 30000 to which the asset 30003 to be presented belongs is preferentially used. If the LCT 30100 is not placed in the PA message 30100 to which it belongs, the presentation area information of the LCT 30100 placed in the PA message 30100 of the upper layer is used.

By using the method of this operation example, when the same LCT 30100 is used in the entire program data of FIG. Since the information can be acquired, it is possible to quickly present the program data.

<Operation example 2>
If the LCT 30100 is not included in the MMTP packet, the presentation area information of the LCT 30100 acquired so far is used. That is, the broadcast receiving apparatus stores the presentation area information of LCT 30100 and updates the stored presentation area information each time a new LCT 30100 is obtained.

However, immediately after the occurrence of an event that invalidates the presentation area information that has been used up to that point, such as when the power is turned on or when the channel is changed, there is still no valid presentation area information. Even if it is acquired, it may not be possible to present the data. Therefore, until valid presentation area information is acquired, presentation processing is performed assuming that, for example, the presentation area shown in FIG. 19A is set as provisional presentation area information. The settings in FIG. 19A are hereinafter referred to as default settings. For the presentation area shown in the default setting (FIG. 19A), a full-screen display area is set for a device whose device_id is 0, that is, the main device, and 0 is assigned to layout_number, 0 is assigned to region_number, and 0 is assigned to layer_order.

In FIG. 35A, only the main asset 30201 is presented using provisional presentation area information, and in FIG. is in a state of When provisional presentation area information is used, the presentation area specification of the main asset is ignored, and an area with layout_number of 0 and region_number of 0 is specified, and other assets are not presented. Here, the main asset means an asset that specifies region_number 0 of the main device or an asset that is transmitted by broadcast waves and specifies region_number 0, and the sub-asset means other assets. do.

By setting the provisional presentation area information in this way, at least the presentation processing of the main asset can be performed even before the information of the LCT 30100 is read.

<Operation example 3>
In operation example 2, an example was shown in which only the main asset is presented using the default presentation area information until a new LCT 30100 is acquired, such as when the channel is changed. The LCT30100 that was previously used may be used. Present the asset (main asset) specified in the area where the region_number is 0 in the program after the channel change in the area where the region_number of the presentation area information used until then is 0, and display the other assets (sub-assets). do not.

After acquiring the LCT 30100 of the program after the channel change, all the assets are presented using the presentation area information. Further, when the LCT 30100 used in the program that has been viewed so far divides the display area as shown in FIG. If the LCT 30100 used in the program being watched displays an overlay as shown in FIG. 19C, the processing of Operation Example 3 may be performed. Further, when the LCT 30100 used in the program that has been viewed so far has an area with a region_number of 1 or higher, a predetermined pattern or message may be displayed in the area. .

By using the presentation area information of the program that has been viewed so far in this way, at least the main asset presentation process can be performed even before the information of the LCT 30100 is read.

<Operation example 4>
Since the channel may be returned to the original channel after the channel change, the information of the LCT 30100 once read is stored in association with the channel information, and when the channel is returned, the stored presentation area information is used. good. If the latest LCT 30100 is stored for all channels receivable by broadcast receiving apparatus 100, the convenience of presentation area control when changing channels is improved.

In addition, since the presentation area information may be changed even during the program, if an expiration date is set in the LCT 30100 and the expiration date has passed when the channel is returned, the presentation area information will not be used. Instead, only the main asset is presented using the default settings or the presentation area information of the program that has been viewed up to that point by the method shown in Operation Example 2 or Operation Example 3. FIG. Alternatively, only the main asset may be presented using the expired presentation area information of the channel. Of course, after acquiring the new LCT 30100, the normal presentation method is restored. The control may be performed by referring to the expiration date, or may be performed by referring to the version instead of the expiration date information.

FIG. 36A shows an example in which the LCT 30100 has an expiration date. Set in the LCT expiration descriptor in NTP length format (ending_time). Descriptors are placed in the descriptor area of LCT 30100 (FIG. 18).

Alternatively, an expiration date may be set for each layout, as shown as a layout expiration date descriptor in FIG. 36B.

Alternatively, an expiration date may be set for each area, as shown in the presentation area expiration descriptor in FIG. 36C.

The expiration date may be set for a single layer, or may be set for multiple layers. When setting expiration dates in multiple hierarchies, give priority to earlier expiration dates for each region.

By this method, once acquired presentation area information can be effectively used while considering the expiration date.

<Operation example 5>
In the operation example 4, the presentation area information of the program that has been read once is stored. A method of acquiring the common presentation area information in advance by the receiving apparatus 100 and using the common presentation area information in each program may be used.

The common presentation area information is obtained in advance by the broadcast receiving apparatus 100 in the form of LCT (FIG. 18). The common presentation area descriptor shown in FIG. 37 is used to indicate common presentation area information. Place this descriptor in the descriptor area of the LCT (FIG. 18) and list the layout number, which is the common presentation area, together with the device number. service_id represents a broadcast channel. Furthermore, the starting time (beginning_time) and the ending time (ending_time) of the validity period of the common presentation area information are described in NTP length format. In addition, full_set_flag is also described so that it can be confirmed that all the information is complete when updating the information. The meaning of full_set_flag is summarized in FIG.

This common presentation area information may be read once a day or once a week, for example, in a time zone outside broadcast hours. Also, it may be acquired from a broadcast wave, or it may be acquired via the Internet.

For the case where the common presentation area information is not read, the common presentation area information used in the program is transmitted as LCT30100 in the program data. At that time, full_set_flag of the common presentation area descriptor indicates that the information is a part of the common presentation area information.

By using this common presentation area information, the asset 30003 can be quickly presented even at the timing immediately after power-on of the broadcast receiving apparatus 100 or immediately after the program is switched and before the acquisition of the LCT 30100 .

<Operation example 6>
Although the method of using the common presentation area information has been shown in Operation Example 5, even if the common presentation area information is a channel transmitted by broadcast waves or the Internet, depending on the program, it is not described in the common presentation area information. You may use the presentation area of the layout.

Specifically, the layout information that is not described in the common presentation area information may be described in the LCT 30100 of the program. At that time, since the common presentation area descriptor (FIG. 37) describes the layout number of the common presentation area, broadcast receiving apparatus 100 grasps whether or not LCT 30100 has additional presentation area information that is not the common presentation area. , use that information in some cases. At this time, if the layout number and area number of the presentation area overlap with the common presentation area information, it is determined in advance which information is prioritized. That is, depending on the broadcasting system, the broadcast receiving apparatus 100 may be configured to give priority to the common presentation area information. Further, depending on the broadcasting system, the broadcast receiving apparatus 100 may be configured to give priority to presentation area information for each program.

Furthermore, if the common presentation area descriptor (FIG. 37) is not arranged in LCT 30100, all the presentation area information described in LCT 30100 is treated as being designated as non-common area information.

Note that this program-specific additional presentation area information may be acquired from a broadcast wave, but it may also be acquired via the Internet instead of from a broadcast wave.

According to this method, presentation area information optimized for each program can be used while using common presentation area information.

<Operation example 7>
The asset 30003 is presented in one presentation area, but when it is better to display it on as many terminals as possible, such as breaking news, the same content is presented on all terminals that are available at that time. Better.

As a specific method, among the layout settings of the main device (device whose Device_id is 0), the layout_number for setting the same region in other devices is described in the duplicate presentation region specification descriptor (FIG. 39). This descriptor is placed in the descriptor area of LCT 30100 (FIG. 18).

FIG. 40 shows an example of presenting a screen with the same content to a sub-device (portable information terminal 700) in addition to the main device (broadcast receiving apparatus 100).

In addition, in order to return to the original program after the end of the special news, the presentation area information used in the original program may be stored, and the information may be used after the end of the special news.

This method increases the awareness of important information with high urgency.

<Operation example 8>
The presentation area of each asset 30003 is specified by layout_number (layout number) and region_number (area number) by the MPU presentation area specification descriptor (FIG. 34). If there is no presentation area information corresponding to this layout number and area number, presentation is not possible, so the asset 30003 is not presented. However, if the abnormal asset 30003 is presented in a partial area of the screen, it may not be apparent at first glance that the display is abnormal. Therefore, when an asset 30003 that cannot be presented occurs, an error display as shown in FIG. 41 is performed.

This method allows the viewer to recognize that the display is not performed normally.

<Operation example 9>
In operation example 8, the operation when a presentation area without presentation area information is specified has been described, but the operation when a different asset 30003 specifies the same presentation area will be described. Assets that display some kind of content cannot be displayed in the same presentation area, so different assets 30003 must not specify the same presentation area at the same time. If specified at the same time, priority is given to assets transmitted by broadcast waves. Alternatively, presentation of the asset 30003 that initially used the layout number and area number is continued, and presentation of the later designated asset 30003 is prohibited. Alternatively, presentation of all the assets 30003 with overlapping area designations is prohibited. If an asset 30003 that cannot be presented occurs, an error display such as that shown in FIG. 41 may be displayed.

However, it is possible that the same presentation area is designated with different assets 30003, for example, when adding additional asset information to the video asset to increase the gradation. Dependency descriptor information is used to indicate that a plurality of assets are in a complementary relationship that constitutes one piece of content. FIG. 42 shows the data structure of the dependency descriptor. If there is this dependency, presentation is permitted even if the same presentation area is specified.

In order to manage the presentation area designation of the asset 30003, a management table may be used to indicate which asset 30003 designates which presentation area. FIG. 43 shows an example of the management table. Since assets 30003 with asset IDs 1 and 3 and asset IDs 2 and 4 have a dependency relationship, display is permitted even if the same area is specified. On the other hand, an asset 30003 with an asset ID of 7 is a video asset and specifies the same area as that of the asset with an ID of 0 without any dependency, so presentation is prohibited.

Since the asset 30003 with asset ID 1 is transmitted by broadcast waves, this is given priority. In addition, presentation of the asset 30003 with asset ID8 is prohibited because the presentation of the asset 30003 with asset ID7 from the same acquisition source is prohibited. Assets with asset IDs 2, 4, 6, and 8 are audio assets, and since audio assets are not directly related to presentation processing in the monitor unit 162, they do not necessarily need to be managed in the management table. That is, only video assets may be managed by the management table.

By controlling the presentation in this way, it is possible to prevent an abnormal presentation when the control information is inconsistent.

<Operation example 10>
The dependency relationship of the assets 30003 includes a parallel relationship in which content cannot be completed unless a plurality of dependent assets 30003 are aligned, and a case in which data for high image quality is added to another asset 30003 for a subjective asset 30003 . In some cases, such as when given by The subjective asset 30003 can be presented independently, but the dependent asset 30003 is highly likely to be presented abnormally if the subjective asset 30003 does not exist. If not, presentation of the dependent asset 30003 is prohibited. It should be noted that a multi-hierarchical structure in which another asset 30003 is subordinate to the subordinate asset 30003 may be employed.

In order to specify the dependency relationship, it is sufficient to determine in advance whether the asset 30003 described in the dependency descriptor (FIG. 42) indicates the dependent asset 30003 or the asset 30003 dependent on the asset. . In the case of assets 30003 in a parallel relationship, a dependency descriptor (FIG. 42) is arranged assuming that both depend on the other.

Another method of specifying dependencies may be to use dependency descriptors (FIG. 42) to specify dependencies. FIG. 44 shows a dependency descriptor that specifies dependency. Specify a parameter called dependency_type that indicates the type of dependency for the asset in the dependency relationship. FIG. 45 shows the meaning of dependency_type. 0 is subordinated to the other party, and 1 is subordinated by the other party. If they are in a parallel relationship, they are designated as subordinate to the other asset.

FIG. 46 shows an example of a presentation permission/prohibition management table. Assets with IDs 3 and 4 are subordinate to IDs 1 and 2, but are allowed to be presented because the assets with IDs 1 and 2 have been acquired. On the other hand, assets with IDs 9 and 10 are prohibited from being presented because assets with IDs 7 and 8, which are subordinate destinations, have not been acquired.

Assets with IDs 11 and 12 are in a mutually dependent relationship, but since both are complete, presentation is permitted. On the other hand, assets with IDs 13 and 14 are also in a mutually dependent relationship, but since the asset with ID 14 has not been acquired, presentation of the asset with ID 13 is prohibited. If an asset 30003 that cannot be presented occurs, an error display as shown in FIG. 41 may be performed.

In this way, by controlling the presentation while considering the dependency relationship, it is possible to prevent abnormal presentation when there is inconsistency in the control information.

<Operation example 11>
The broadcast receiving apparatus 100 can present both assets 30003 acquired from broadcast waves and assets 30003 acquired from a communication line (Internet). It is also possible that the broadcast receiving apparatus 100 is not connected to a communication line in the first place. Therefore, normally, only the broadcast video of the broadcast wave is displayed on the full screen using the default setting (FIG. 19A), and when the asset 30003 via the communication line is acquired, the asset 30003 is displayed in the area specified according to the setting of the LCT 30100. may be presented.

For example, the area setting of LCT 30100 is as shown in FIG. 19B, where the broadcast video is set to be presented in area 0, and the asset 30003 via the communication line is set to be presented in areas 1 and 2. explained in case. If only the broadcast wave video can be received, the broadcast video is displayed in full screen using the default settings (Fig. 19A), and when the asset 30003 via the communication line can be acquired, the area setting of the LCT 30100 The broadcast video is presented in area 0 in FIG. 19B, and the asset 30003 via the communication line is presented in areas 1 and 2. In this case, the LCT 30100 may not be transmitted by broadcast wave, but may be transmitted together with the asset 30003 via the communication line. By using the method of this operation example, it is possible to display according to the actual reception status of the program data. Note that if only one of the assets 30003 via the communication line has been acquired and the other has not been acquired, the default settings (FIG. 19A) may be left as they are. It is desirable to control to move to the area setting of FIG. 19B when the assets 30003 via both communication lines are ready.

Although the embodiments of the present invention have been described above using Examples 1 to 3, 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. These all 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 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 (accumulation) 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.

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.

DESCRIPTION OF SYMBOLS 100,800...Broadcast receiver, 100a...Antenna, 101,801...Main control part, 102,802...System bus, 103,803...ROM, 104,804...RAM, 110,810...Storage part, 121,821... LAN communication section 124, 824... Expansion interface section 125, 825... Digital interface section 131, 831, 832... Tuner/demodulation section 132... Separation section 141... Video decoder 142... Video color gamut conversion section 143 Audio decoder 144 Text super decoder 145 Subtitle decoder 146 Subtitle synthesis unit 147 Subtitle color gamut conversion unit 151 Data decoder 152 Cache unit 153 Application control unit 154 Browser unit 155 Application color gamut conversion unit 156 Sound source unit 161, 861 Video synthesizing unit 162, 862 Monitor unit 163, 863 Video output unit 164, 864 Audio synthesizing unit 165, 865 Speaker unit , 166, 866... Audio output unit 170, 870... Operation input unit 841... MMT decoding unit 842... MPEG2-TS decoding unit 200... Internet 200r... Router device 200a... Access point 300t... Radio wave Tower 300s...Broadcasting satellite (or communication satellite) 300...Broadcasting station server 400...Service provider server 500...Other application servers 600...Mobile phone communication server 600b...Base station 700...Portable information terminal .

Claims (1)

A content protection processing method in a broadcast receiving device of a transmission system for transmitting broadcast program content from a broadcasting station and receiving the broadcast program content in a broadcast receiving device, comprising:
a receiving step of receiving the broadcast program content;
an accumulation step of accumulating the broadcast program content received in the receiving step;
with
In the storing step, when the broadcast program content received in the receiving step is a content that can be copied without restrictions in the transmission system and that is protected by encryption and is transmitted, it can be reproduced only by the broadcast receiving device. The broadcast program content is stored in an encrypted state such that
The accumulation of the broadcast program content in the accumulation step can be performed in an accumulation unit located at an output destination of the IP interface via an IP interface configured by hardware compatible with Ethernet provided in the broadcast receiving device. be,
Content protection handling method.

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