JP2010016442A - Digital broadcast receiver and digital broadcast system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly convenient digital broadcast receiver or the like by making tuning possible without performing a scan operation when receiving digital broadcast using an optional segment. <P>SOLUTION: The digital broadcast receiver includes a tuner part for receiving digital broadcast signals transmitted from one transmission station using part of a plurality of segments, performing tuning and outputting the transport stream of a tuned program. The transmission frequency of the transmission stations including another transmission station is acquired from the transport stream output by the tuner part, and another transmission station corresponding to the acquired transmission frequency is registered as the transmission station configuring the same system as the one transmission station. Then, when the digital broadcast signals can not be received from the one transmission station, the digital broadcast signals are received on the basis of the transmission frequency of the registered transmission station configuring the same system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a tuner unit that receives and selects a digital broadcast signal transmitted from one transmission station using a part of a plurality of segments, and outputs a transport stream of the selected program. The present invention relates to a digital broadcast receiver and the like.

  The band of one channel of terrestrial digital broadcasting is divided into 13 segments, of which one segment of the center frequency is for mobile reception, and the remaining 12 segments are for fixed reception (for example, non-patent) Reference 1). A broadcast receiving apparatus compatible with terrestrial digital one-seg broadcasting is designed to receive a TS (transport stream) broadcast in this central segment and present video, audio, and data broadcasts.

  One example of this broadcast receiving apparatus is a one-segment mobile phone that receives terrestrial digital broadcasts for portable terminals. In conventional mobile phones, as a user interface for channel selection, a function for selecting a desired broadcast station by pressing a numeric key or a left / right key, or a specific operation such as pressing a left / right key length, is performed in order of physical frequency. It has a function of searching for receivable broadcast stations and presenting receivable broadcasts to viewers. The conventional one-seg compatible mobile phone that receives digital terrestrial broadcasting for mobile terminals is supposed to receive only one segment for mobile reception. Therefore, the physical frequency received by the tuner during channel selection is the center segment (segment 0).

In recent years, broadcasting systems have been proposed in which one-segment broadcasting is performed in segments other than the central segment of one channel of terrestrial digital broadcasting (see, for example, Non-Patent Document 2 and Non-Patent Document 3). As an example, a receiving device (arbitrary segment broadcast receiving device) capable of receiving narrow-band one-segment broadcasting broadcast in an arbitrary segment among a plurality of segments is known.
1Seg Service, [online], NTT DoCoMo, Internet <http://www.nttdocomo.co.jp/service/music_movie/1seg/> Kenichi Tsuchida, Development of One-Seg Linked Retransmission Device, [online], NHK Broadcasting Technology Laboratory, Internet <http://www.nhk.or.jp/strl/publica/giken_dayori/jp2/rd-0702-2.html > 1Seg Area Portal Broadcast, [online], Area Portal Co., Ltd. Internet <http://www.areaportal.co.jp/pdf/wtp2006/wtp_2006.pdf>

  Here, as described above, there has been proposed a broadcasting system in which one-segment broadcasting is performed in segments other than the central segment (0 segment) of the digital terrestrial broadcasting 1 channel. In this case, the broadcasting service can be configured by any segment having a number from 0 to 12 as well as the segment 0 from among the 13 segments. Therefore, in order to find a broadcasting service of the same broadcasting system, it is necessary to scan all 13 segments for each channel, which is theoretically up to 13 times compared with the case where only the segment 0 is scanned by the conventional system. The total scan time was reached, and it was impossible to switch channels quickly.

  Also, when segmented broadcasting is performed in a certain area, even if the user scans each segment over a long time, depending on the user's reception environment, all the broadcast segments can be received There was a problem such as not limited.

  That is, a program transmitted from an adjacent area transmitting station may not be able to be received even if it is moved to an adjacent area if it is not transmitted from the current area transmitting station.

  Here, if every channel is scanned every time the reception area changes, the scanning operation takes time, and appropriate tuning cannot be performed.

  In view of the above-described problems, the object of the present invention is to provide a high convenience by enabling channel selection without performing a scanning operation when receiving a digital broadcast broadcast using an arbitrary segment. It is to provide a digital broadcast receiver and the like.

  In order to solve the above-described problem, the digital broadcast receiving apparatus of the present invention receives a digital broadcast signal transmitted from one transmitting station using a part of a plurality of segments, selects a channel, and is selected. A digital broadcast receiving apparatus including a tuner unit that outputs a transport stream of a program, wherein a transmission frequency for acquiring a transmission frequency of a transmission station including other transmission stations from the transport stream output by the tuner unit An acquisition unit; and a registration unit that registers another transmission station corresponding to the transmission frequency acquired by the transmission frequency acquisition unit as a transmission station that constitutes the same system as the one transmission station, and the tuner unit If the digital broadcast signal cannot be received from one transmission station, the transmissions constituting the same system registered by the registration means Characterized by receiving a digital broadcast signal based on the transmission frequency.

  In addition, the digital broadcasting system of the present invention includes a transmitting station that transmits a digital broadcasting signal using a part of a plurality of segments, a channel that receives and selects the digital broadcasting signal, and transports the selected program A digital broadcast system including a digital broadcast receiving apparatus including a tuner unit that outputs a stream, wherein the transmitting station performs a process of multiplexing the transmission frequency of the transmitting station constituting the same system into a transport stream A transmission frequency acquisition unit that acquires a transmission frequency of a transmission station including other transmission stations from the transport stream output by the tuner unit; and the transmission frequency Another transmitting station corresponding to the transmission frequency acquired by the acquiring unit constitutes the same system as the transmitting station A registration unit that registers as a transmission station, and when the tuner unit cannot receive a digital broadcast signal from one transmission station, the transmission unit that constitutes the same system registered by the registration unit The digital broadcast signal is received on the basis of the transmission frequency.

  In the digital broadcasting system of the present invention, the multiplexing processing unit multiplexes the transmission frequency of a transmission station adjacent to the transmission station into a transport stream for processing.

  According to the present invention, the tuner unit that receives and selects a digital broadcast signal transmitted from one transmitting station using a part of a plurality of segments, and outputs a transport stream of the selected program. A transmission station that acquires the transmission frequency of a transmission station including other transmission stations from the output transport stream and configures the other transmission station corresponding to the acquired transmission frequency in the same system as the one transmission station Register as When the digital broadcast signal cannot be received from one transmission station, the digital broadcast signal is received based on the transmission frequency of the transmission station constituting the same registered system. Therefore, when the digital broadcast receiving apparatus newly receives a digital broadcast signal by changing the transmission station, it is possible to receive and select the digital broadcast signal based on the registered frequency without performing a scanning operation or the like. It becomes possible.

  Embodiments of the present invention will be described below with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: It is not the thing of the character which limits the technical scope of this invention.

Embodiment
An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a case where the digital broadcast receiving apparatus of the present invention is applied to a mobile phone will be described.

[1. overall structure]
FIG. 1 is a diagram for explaining an example of the arrangement of transmitting stations 1. The transmitting station 1 is one of transmitting stations that transmit digital broadcast signals, and is composed of a plurality of transmitting stations of the same system. In the case of FIG. 1, the transmission station 1a, the transmission station 1c, and the transmission station 1d are transmission stations of the same system, and the transmission station 1b is a transmission station outside the same system.

  The transmission station 1a transmits the transmission frequencies of the transmission stations 1d and 1c, which are transmission stations of the same system, as the NIT frequency. In the case of the transmitting station 1c outside the same system, even if the transmission areas overlap, frequencies that are not in the same system are not described in the NIT.

  Similarly, the transmitting station 1c describes only frequency information of the transmitting station 1a and the transmitting station 1d in the NIT, and the transmitting station 1d describes only frequency information of the transmitting station 1a and the transmitting station 1c in the NIT. Here, the same system is a system in which a plurality of programs to be broadcast are created as the same target service, and the contents of a plurality of programs are similar to each other or information is linked between programs. It is a system that has a relationship with others. Even if transmission areas between transmission stations overlap, the same system is used if transmission information is created for the same purpose even for transmission stations where transmission areas between transmission stations are separated.

  For example, if the system of the transmitting station in FIG. 1 is a service broadcast in front of the station, the transmitting station 1a is a guide broadcasting of a shopping street around the north exit of the station, and 1c is a guidance and exhibition hall of a shopping street around the south exit. 1d is related to contents that are not broadcast services, such as a guide broadcast in an exhibition hall a little away from the station, and it is related to the case where the viewer cannot move and view the content. It is a broadcasting system that transmits a program that is highly likely to require viewing of the broadcast.

  It is a schematic conceptual diagram of the mobile telephone 3 to which the digital broadcast receiver of this invention is applied using FIG. The mobile phone 3 includes a display unit 360 including a liquid crystal screen, an input unit 370, a terrestrial digital broadcast receiving antenna 332, a portable terrestrial digital broadcast receiving tuner (not shown), and a portable terrestrial digital broadcast receiving device.

  The display unit 360 displays digital terrestrial broadcast video and data broadcast. The input unit 370 is a part where the viewer performs a terrestrial digital broadcast viewing operation of the mobile phone, and performs operations such as viewing start / end, channel selection, and broadcast station search by the operation of the input unit 370. When the viewer performs a predetermined operation, the mobile phone 3 according to the present embodiment receives a video / audio / data broadcast of a desired broadcast station by the terrestrial digital broadcast reception tuner and the portable terrestrial digital broadcast reception device. It becomes.

[2. Functional configuration]
Next, functional configurations of the transmission station 1 and the mobile phone 3 will be described. FIG. 3 is a functional block diagram of the transmission station 1 of the present embodiment. The transmission station 1 includes a transmission data encoding unit 110, a system information creation unit 112, a multiplexing processing unit 114, a CRC code addition processing unit 116, a data modulation unit 118, and a data transmission unit 120. ing.

  First, it is assumed that digital broadcasting is performed in conformity with the MPEG2 system standard (ISO / IEC13818-1). The transmission data encoding unit 110 encodes and compresses video data, audio data, caption data, BML data, and the like to construct a PES (Packetized Elementary Stream) for transmission.

  The system information creation unit 112 includes PSI (Program Specific Information) which is information necessary for channel selection, and SI (Service Information) necessary for a user interface such as EPG (Electronic Program Guide) in the receiving apparatus among program arrangement information. Is generated. PSI is defined by the MPEG2 system standard (ISO / IEC 13818-1), and SI is defined by the DVB standard (ETS300 468) in Europe and the ARIB standard (ARIB-STD B10) in Japan.

  The multiplexing processing unit 114 converts the data generated by the transmission data encoding unit 110 and the system information creation unit 112 into a transport packet and multiplexes the data into a transport stream (TS).

  The CRC code addition processing unit 116 is a functional unit that performs processing for adding an error correction code to the transport stream (TS). The data modulation unit 118 is a functional unit that modulates to transmit a transport stream (TS). As a modulation method, OFDM is used in the case of terrestrial digital in Europe and Japan. The data transmission unit 120 radiates the modulated transport stream (TS) input from the data modulation unit 118 as a radio wave to the transmission path.

  Here, details of the system information created by the system information creation unit 112 of FIG. 3 will be described with reference to FIG. The PAT (Program Association Table) information 112a is information in which a program list included in the TS is stored as a PID list of a PMT (Program Map Table).

  The PMT information 112b is information that stores each PID such as an image or sound included in the program. If a PID such as an image or sound can be obtained from the PMT, the program can be reproduced by obtaining a TS packet with the PID.

  The NIT (Network Information Table) information 112c is information about a network to be transmitted, such as a channel number, a modulation scheme, a frequency, and a guard interval.

  The EIT (Event Information Table) information 112d is information related to the program such as the program name, broadcast date and time, and broadcast content.

  BIT (Broadcaster Information Table) information 112e includes broadcasting station identification information (BSD), series information (terrestrial D), retransmission period of each SI table, SI posting period, logo information transmission method, etc. Information.

  SDT (Service Description Table) information 112f is information including a channel name. Further, the type of EIT transmitted by each channel (service) and digital copy control information are also included. In addition, information defined by ARIGB and STD may enter.

  Next, the functional configuration of the mobile phone 3 will be described with reference to FIG. The mobile phone 3 includes a control unit 310 that controls the mobile phone, a radio unit 320, a communication antenna 322 connected to the radio unit 320, a communication control unit 325 that controls communication of the mobile phone, and digital terrestrial broadcasting. The front end unit 330, the terrestrial digital broadcast receiving antenna 332 connected to the front end unit 330, the back end unit 335 for one seg, the speaker 345 for outputting sound during a call or watching TV, and the speaker 345. Audio decoding unit 340 that outputs audio, microphone 355 that inputs audio, audio encoding unit 350 that encodes audio input from microphone 355, digital terrestrial broadcast video and data broadcast, broadcast station name and program A display unit 360 for displaying information on the channel currently selected, such as a name, an input unit 370 for receiving input from a viewer, and a storage unit It is constituted by a 80.

  The control unit 310 is a functional unit that controls the mobile phone 3, and is a functional unit that implements each process by reading and executing various stored programs. For example, it is configured by a CPU (Central Processing Unit).

  The wireless unit 320 is a functional unit that provides each telephone function by communicating with a telephone base station (not shown) via the communication antenna 322. The radio unit 320 is controlled by the communication control unit 325 and communicates with the telephone base station. Since the present invention and the telephone function are not directly related, detailed description thereof is omitted.

  The front end unit 330 is composed of a tuner and a demodulator capable of receiving an arbitrary segment of each channel of terrestrial digital broadcast input from the terrestrial digital broadcast receiving antenna 332, and receives a demodulated TS (transport stream). Output to the one-segment back-end unit 335. The one-segment back-end unit 335 includes video data and audio data from the input TS, a PSI (Program Specific Information) section which is data used for program selection, an SI (Service Information) section indicating program information, and a data broadcasting Separate data etc.

  Among these, PSI, SI section, and data broadcasting data are input to the control unit 310 and processed by software of the control unit 310. The video data and audio data are decoded by the one-segment back-end unit 335, and video / audio is presented to the viewer through the display unit 360 and the speaker 345.

  The audio decoding unit 340 is a functional unit that decodes the audio data input from the communication control unit 325 and the audio data input from the one-segment back end unit 335 and outputs the decoded data to the speaker 345. The voice encoding unit 350 is a functional unit that encodes the voice input from the microphone 355 and outputs the encoded voice to the communication control unit 325.

  The display unit 360 is a display unit for displaying various states in the mobile phone 3. Further, it is a functional unit for displaying video data input from the front end unit 330 and the one-segment back end unit 335. The display unit 360 is composed of, for example, an LCD (Liquid Crystal Display).

  The input unit 370 is a functional unit that receives an operation / instruction input from the viewer. The input unit 370 includes a direction key, a numeric keypad 704, and the like. In the present embodiment, the input unit 370 is described as being configured with keys (buttons), but it is needless to say that the input unit 370 may be configured with other input means such as a touch panel.

  The storage unit 380 is a functional unit for storing the setting state of the mobile phone 3 and storing various data. Here, the storage unit 380 includes any one of storage devices such as a semiconductor memory, a hard disk drive, and an optical drive. The storage unit 380 registers a list of currently receivable channels and is referred to when selecting a channel.

[3. Channel configuration]
Next, the channel configuration of terrestrial digital broadcasting in the present embodiment will be described with reference to FIG. As shown in FIG. 6 (a), one channel of ordinary terrestrial digital broadcasting has a bandwidth of about 5.7 MHz, and this band is divided into 13 segments and is carried by the central segment (segment 0). Broadcasting for terminals (one-segment broadcasting) is performed, and broadcasting for fixed reception is performed in the remaining 12 segments.

  In the present embodiment, in addition to the above-described one-segment broadcasting broadcast system, one or a plurality of non-overlapping segments of the same channel from a plurality of transmitters as shown in FIG. There is segment separation broadcasting such as one-segment broadcasting. The broadcast as shown in FIG. 6 (b) is supposed to be broadcast in a narrow area such as an underground mall, a stadium, or a station. In these areas, normal one-segment broadcasting can be received on another channel. In some cases.

  In the present embodiment, an arbitrary segment is received in a service area where segment separation broadcasting is performed as shown in FIG. 6B using one of the channels not currently used in one-segment broadcasting, and the PSI / SI is received. From the information, the frequency of other segment-separated broadcast channels in the area is also acquired at the same time, stored as a segment reception channel list in the mobile terminal, service contents are provided to the user within the service, and the area is moved This makes it possible to easily perform the tuning process at the time.

  In addition, the state where the terminal is receiving segment 0 one-segment broadcasting (normal one-segment broadcasting) at the time of channel selection is called “normal one-segment reception mode”, and the state of receiving segment-separated broadcasting at the time of channel selection is “segment” This is called “reception mode”. In the normal one-segment reception mode, the unit of physical frequency set in the front end unit 330 at the time of channel selection is a channel unit, whereas in the segment reception mode, the unit of physical frequency to be set is a segment unit.

[4. Process flow]
Next, the flow of processing in the mobile phone 3 will be described using the flowchart of FIG. FIG. 7 is a flowchart for explaining the operation of the mobile phone 3 in this embodiment.

  First, after the viewer turns on the mobile phone 3 and the startup process is performed, the control unit 310 executes the one-segment startup process by a key input from the viewer (step S10). By the one-segment activation process, the front end unit 330 and the one-segment back end unit 335 are activated.

  First, after one-segment activation is performed at the position of area A where segment broadcasting is performed as shown in FIG. 1, the mode is changed to the segment reception mode in order to receive segment broadcasting (step S12). Thereafter, a tuning process is performed on the frequency of the transmitting station 1a (step S14). Here, the control unit 310 sets a reception frequency in the front end unit 330 and sets a TS packet type acquired and analyzed by the control unit 310 in the one-segment back end unit 335.

  The control unit 310 analyzes the input PSI / SI (step S16) and acquires all the frequencies described in NIT (Network Information Table) which is one of the PSIs. In the transmitting station 1a, since the frequency information of the transmitting station 1a and the information of the transmitting station 1b and the transmitting station 1c are described, all the frequencies of the transmitting stations belonging to the same system are acquired.

  This will be specifically described with reference to FIGS. FIG. 8 is a diagram for explaining an outline of a packet. The TS output from the front-end unit 330 is a set of fixed-length TS packets, and each TS packet is classified into a video packet, an audio packet, a PSI / SI packet, and the like according to a packet ID included in the header unit.

  FIG. 9 shows the configuration of an NIT (Network Information Table), which is one of the PSI packets defined by the radio industry (ARIB). [Table_id] in FIG. 9A is an identifier indicating what the section of the network information indicates, and describes the service of the currently received transmitting station.

  [Section_syntax_indicator] is an identifier indicating a section syntax instruction, and [section_length] is an identifier that defines the number of bytes of a section from immediately after a section length field to the end of a section including a CRC (Cyclic Redundancy Check). .

  [Network_id] is an ID for identifying the network indicated by the NIT, and [version_number] is an identifier indicating the version number of the subtable. [Current_next_indicator] indicates that the sub-table is the current sub-table when this value is “1”, and when it is “0”, the sub-table to be sent is not yet applied, and the next sub-table An identifier indicating that a table is used.

  [Section_number] is an identifier indicating a section number, and has a value of “0x00” when it is the first section in the sub-table. This section number is incremented by “1” each time a section having the same [table_id] and [network_id] is added.

  [Last_section_number] is an identifier indicating the number of the last section of the sub-table to which the section belongs, that is, the section having the largest section number, and [network_descriptors_length] is a network descriptor (descripter ()) that follows This is an identifier indicating the total number of bytes in the loop.

  [Transport_stream_loop_length] is an identifier indicating the total number of bytes of the transport stream loop that ends immediately before the first byte of the CRC. In the transport stream loop, [transport_stream_id] is an identifier for identifying this transport stream from other multiplexes in the distribution system, and [original_network_id] is an identifier indicating [network_id] of the original network. . [Transport_descriptors_length] is an identifier indicating the total number of bytes in the loop of the transport descriptor (descripter ()) that follows. [CRC_32] is an identifier that indicates a CRC and includes a CRC value such that the register output becomes “0” after the entire section is processed.

  Thus, in the digital broadcasting system, the network ID [network_id] for identifying the network is described in the NIT, and the concept of the network is introduced in constructing the broadcasting system.

  The data structure of the ground distribution system descriptor defined in the ARIB STD-B10 is shown in FIG. 9B, and the ground distribution system descriptor will be described. [Descriptor_tag] is an identifier for identifying various network descriptors. In the case of a terrestrial distribution system descriptor, a predetermined value is described. It should be noted that the value to be described in [descriptor_tag] is a value that conforms to the provisions of MPEG-2 Systems according to the type of network descriptor.

  [Descriptor_length] is an identifier indicating the total number of bytes of the data portion of the network descriptor immediately following this identifier. [Area_code] is an identifier indicating a service area in which the transport stream is transmitted, and is a 12-bit identifier.

  [Guard_interval] is an identifier indicating the guard interval length and transmission mode of the OFDM signal in which the transport stream is modulated, and [transmission_mode] is mode information of the OFDM signal in which the transport stream is modulated. It is an identifier. [Frequency] is an identifier indicating the RF frequency of the OFDM signal to which the transport stream is transmitted. [Frequency] makes it possible to define a plurality of transmission frequencies of a transmission signal in order to enable retransmission using a plurality of frequencies.

  Utilizing the fact that this plurality can be defined, in [frequency], the same segment receiving system describes and transmits all frequencies of transmitting stations in the same system.

  Returning to the description of the operation of the mobile phone 3 (the description of FIG. 7), the mobile phone 3 can acquire the frequency described in the NIT by referring to the above-mentioned [frequency] (step S18).

  Then, all the frequency values described in the NIT are registered in the storage unit 380 as a segment reception mode channel list (step S20), and a segment broadcast program served by the transmitting station 1a is displayed (step S20). S22).

  In the transmission station 1a, the frequency information of the transmission station 1a and the information of the transmission station, the transmission station 1d, and the transmission station 1c that are the same system are described, so that a channel list for the same system is created. become.

  Here, when the mobile phone 3 moves to the area B (step S24; Yes), since it is out of the service area of the broadcast wave of the transmitting station 1a, it can be received in the area B with reference to the channel list registered in the step S20. A channel selection operation is performed based on the channel list of the transmitting station 1b (step S30). And a process is performed from step S16 based on TS transmitted from the transmitting station 1b.

  Here, when the mobile phone 3 does not move to the area B as an example, the program is displayed until there is an instruction to end the program display (Step S24; No → Step S26; No → Step S24).

  When a program display end instruction is given, a one-segment end process is executed, and this process ends (step S26; Yes → step S28).

  As described above, in the case of a system that provides a segment broadcasting service using a plurality of transmitting stations, setting and transmitting all the frequency data in the same system to the NIT information of all transmitting stations installed by itself, Information on the transmitting station of the same system that cannot be received at the current position can be notified to the receiver side (mobile phone 3) of all information of the same system, so that the viewer is surely notified of the service. It becomes possible to do.

  Also, the receiver side (mobile phone 3) is notified of all frequencies of services provided by the same system that is currently being received by simply performing normal viewing processing for viewing any one transmitting station. Therefore, it is possible to create a dedicated channel list, so that it is not necessary to perform seek or scan when moving outside the area of the currently receiving transmitting station, so that tuning of the same service can be performed easily. Become.

  Further, by not distinguishing the NIT table ID as other transmitting stations, there is an effect of reducing the memory in the receiver.

  In the above-described embodiment, the segment reception mode has been described. However, the present invention is not limited to the segment reception mode as long as broadcasting is performed in a narrow area.

[5. Modified example]
In the above-described embodiment, an example in which the present invention is used for a mobile phone has been described. However, the present invention may be used for other devices as long as the device can receive one-segment broadcasting. For example, a personal computer, a portable terminal, a car navigation system, etc. are mentioned.

  Further, in the above-described embodiment, one seg broadcasting of Japanese terrestrial digital broadcasting and segment unit broadcasting derived from one seg broadcasting have been described as examples. However, the present invention is not limited to this, and the frequency between adjacent broadcasting bands is not limited thereto. The present invention can be applied to a receiver that can receive broadcasting systems having different widths. Therefore, the present invention can also be applied to a receiver that receives normal terrestrial digital broadcasting instead of one-segment broadcasting, or a receiver that receives terrestrial digital broadcasting, one-segment broadcasting, segment separation broadcasting, and the like.

  In the embodiment described above, only the frequency information of the TS NIT is described, but the TS name (corresponding to the broadcasting station name) described in the NIT and the service name (organization channel name, broadcasting business) described in the SDT are described. As for the name of the person, if the TS of another segment is described in the TS of each segment, not only the frequency of the segment with the broadcast wave but also the name of the broadcasting station etc. You can find out what's in the segment.

  In the above-described embodiment, the channel list is created when the NIT is received. However, when the user needs this service while viewing, the channel list may be created by a user operation. Good.

  In the above-described embodiment, a method of creating a frequency channel list and presenting it to the viewer as a channel list is performed. However, the viewer seeks when the broadcast service being viewed becomes out of service due to movement. In this case, a method may be used in which only the frequencies described in the channel list registered in step S20 are searched without performing all segments of all channels. In this case, the broadcast service can be viewed in a short time in the same broadcast service system performed in the area.

  Further, in an environment where a segment reception broadcast service in the same system is performed in an environment in which a user's movement route is determined as shown in FIG. 10, frequency information described in the NIT of the PSI / SI information of each transmitting station is Select the item by describing the frequency information of only the transmitting station where the transmitting area of the transmitting station is adjacent in the same system, or the transmitting station that has no other transmitting station of the same system between the transmitting station and the transmitting station. There is an effect that viewing is reduced and viewing is simplified.

  More specifically, it can be viewed when the broadcasting service of the transmitting station 1A is in the area A, but the viewing service of the transmitting station 1A is out of service area by moving in the areas of B, C, D, and E. . Thereafter, it is possible to receive the broadcasting service of the transmitting stations 1B, 1D, and 1E that are in the same system and whose transmission areas are adjacent to each other, and the transmitting station 1C that has no other transmitting station of the same system between the transmitting station and the transmitting station. However, since the broadcasting service of the transmitting station 1F is not received, only the frequencies of the surrounding transmitting stations 1B, 1C, 1D, and 1E are described in the transmitting station 1A.

  Thereafter, when the user moves to the area E, the transmitting station 1E describes only the frequency information of the transmitting station 1A and the transmitting station 1F in the NIT, and the channel for the same system in accordance with the movement of the viewer. Update the list from time to time.

  When the viewer moves out of the broadcast area he / she was watching and wants to watch the next channel of the same system, the number of channels to be selected is reduced compared to the system described in the embodiment, and the channel selection is performed. There is an advantage that time or seek time is shortened.

  Also, in the above-described embodiment, when the broadcast service being received is out of service area, only the frequency of the same system described in the NIT of the PSI / SI information of the transmitting station that was viewed immediately before is automatically scanned. If a transmitting station that can be received is found, it may be automatically selected.

  Unlike normal one-segment broadcasting, by setting up a transmitter station with a small number of areas where multiple transmitter services overlap, viewers can move while automatically changing only the broadcast service within the same network service system. become.

It is a figure which shows the outline of the system in this embodiment. It is a figure which shows the external appearance of the mobile telephone in this embodiment. It is a figure which shows the function structure of the transmission station in this embodiment. It is a figure for demonstrating the system information creation part in this embodiment. It is a figure which shows the function structure of the mobile telephone in this embodiment. It is a figure for demonstrating regarding segment broadcasting. It is an operation | movement flow explaining the flow of a process of the mobile telephone in this embodiment. It is a figure for demonstrating a TS packet. It is a figure for demonstrating a TS packet. It is a figure for demonstrating the outline of the system in a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission station 110 Transmission data encoding part 112 System information preparation part 112a PAT information 112b PMT information 112c NIT information 112d EIT information 112e BIT information 112f SDT information 114 Multiplexing process part 116 CRC code addition process part 118 Data modulation part 120 Data transmission part DESCRIPTION OF SYMBOLS 3 Cellular phone 310 Control part 320 Radio | wireless part 322 Communication antenna 325 Communication control part 330 Front end part 332 Terrestrial digital broadcast reception antenna 335 One segment back end part 340 Audio | voice decoding part 345 Speaker 350 Voice encoding part 355 Microphone 360 Display part 370 input unit 380 storage unit

Claims (3)

A digital broadcast receiving apparatus having a tuner unit that receives and selects a digital broadcast signal transmitted from one transmitting station using a part of a plurality of segments and outputs a transport stream of the selected program Because
A transmission frequency acquisition unit for acquiring a transmission frequency of a transmission station including other transmission stations from the transport stream output by the tuner unit;
A registration unit that registers another transmission station corresponding to the transmission frequency acquired by the transmission frequency acquisition unit as a transmission station constituting the same system as the one transmission station;
With
The tuner unit receives a digital broadcast signal based on a transmission frequency of a transmission station constituting the same system registered by the registration unit when the digital broadcast signal cannot be received from one transmission station. A digital broadcast receiver characterized by the above. Digital having a transmission station that transmits a digital broadcast signal using a part of a plurality of segments, and a tuner unit that receives and selects the digital broadcast signal and outputs a transport stream of the selected program A digital broadcasting system comprising a broadcast receiving device,
The transmitting station is
A multiplexing processing unit that performs a process of multiplexing the transmission frequency of the transmission stations constituting the same system into a transport stream;
The digital broadcast receiving apparatus includes:
A transmission frequency acquisition unit for acquiring a transmission frequency of a transmission station including other transmission stations from the transport stream output by the tuner unit;
A registration unit for registering another transmission station corresponding to the transmission frequency acquired by the transmission frequency acquisition unit as a transmission station constituting the same system as the transmission station;
Have
The tuner unit receives a digital broadcast signal based on a transmission frequency of a transmission station constituting the same system registered by the registration unit when the digital broadcast signal cannot be received from one transmission station. A digital broadcasting system characterized by   The digital broadcasting system according to claim 2, wherein the multiplexing processing unit multiplexes and processes a transmission frequency of a transmission station adjacent to the transmission station into a transport stream.

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