JP2013201682A - Receiving device, channel search method, program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a channel search during viewing while suppressing complication of a receiving device.SOLUTION: A channel decoding IC 31 of an in-vehicle receiver 1 has, as streaming data of a channel to be viewed, a first generation block 14 for generating first streaming data including broadcasting station information of a broadcasting station which is broadcasting and a second generation block 23 for generating second streaming data of a channel which is different from the channel to be viewed. The channel decoding IC 31 has an information matching determination part 74 for determining whether or not the broadcasting station information of the broadcasting station which is broadcasting the channel to be viewed is matched with broadcasting station information of the broadcasting station which is broadcasting the channel different from the channel to be viewed.

Description

  The present invention relates to a receiving device, a channel search method, a program, and a recording medium.

In recent years, television broadcasting and radio broadcasting have shifted from analog broadcasting to digital broadcasting worldwide. Digital broadcasting can deliver higher quality video and audio than analog broadcasting.
In order to cope with this digital broadcasting, an in-vehicle receiving device that receives digital broadcasting using an antenna, a channel selection unit, and a decoding unit has been proposed (Patent Document 1).
Further, in the receiving device of Patent Document 1, channel search during viewing is realized by switching one channel among a plurality of channels for channel search during viewing.

JP 2011-223439 A

However, when a plurality of channel selection units and decoding units are used as in Patent Document 1, the receiving apparatus becomes complicated and expensive.
In other words, in order to provide a plurality of channel selection units and decoding units in the receiving device, for example, an integrated circuit for channel selection units is mounted for the number of systems, and an integrated circuit for decoding units is mounted for the number of systems. There is a need. In this case, the number of integrated circuits is increased as compared with a receiving apparatus in which only one system is mounted, the connection between the integrated circuits becomes complicated, and the receiving apparatus becomes expensive.
In addition to this, for example, it is necessary to mount an integrated circuit for a channel selection unit capable of inputting / outputting a plurality of systems and an integrated circuit for a decoding unit capable of inputting / outputting a plurality of systems in a receiving apparatus. In this case, it is necessary to create an integrated circuit for the channel selection unit and an integrated circuit for the decoding unit by ASIC (Application Specific Integrated Circuit). Integrated circuits become complex, expensive and special. As a result, the receiving device becomes expensive.

  As described above, the receiving device is required to perform channel search during viewing while suppressing the complexity of the device.

  According to the first aspect of the present invention, first streaming data including broadcasting station information of a broadcasting station is generated as streaming data of a channel to be viewed from received signals including broadcast radio signals of a plurality of channels. A demodulating integrated circuit having a generating unit and a second generating unit that generates second streaming data of a channel different from the channel to be viewed; and the first channel of the viewing channel connected to the demodulating integrated circuit. A decoding integrated circuit for decoding streaming data, and the demodulation integrated circuit broadcasts broadcast station information of a broadcasting station that broadcasts the viewing channel and a channel different from the viewing channel. It is a receiver characterized by having a determination part which determines a coincidence with the broadcast station information of the broadcasting station which is.

  According to a sixth aspect of the present invention, there is provided a receiving apparatus comprising: a demodulating integrated circuit that generates first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels; and a decoding integrated circuit that decodes the first streaming data. The demodulation integrated circuit generates the first streaming data of the channel being viewed and the second streaming data of a channel different from the channel to be viewed, and the first streaming A channel search method comprising: determining whether data broadcast station information matches the broadcast information of the second streaming data.

  According to a seventh aspect of the present invention, there is provided a receiving apparatus comprising: a demodulating integrated circuit that generates first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels; and a decoding integrated circuit that decodes the first streaming data. The demodulated integrated circuit executes the first streaming data of the channel being viewed and the second of a channel different from the channel to be viewed. Streaming data is generated, and a match between the broadcasting station information of the first streaming data and the broadcasting station information of the second streaming data is determined.

  According to an eighth aspect of the present invention, there is provided a receiving apparatus comprising: a demodulating integrated circuit that generates first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels; and a decoding integrated circuit that decodes the first streaming data. The first streaming data of the channel being viewed by the demodulating integrated circuit and the channel to be viewed are recorded on a recording medium recorded with a program executed by a computer as the demodulating integrated circuit. A computer-readable recording medium that generates a second streaming data of a different channel and determines whether the broadcasting station information of the first streaming data matches the broadcasting station information of the second streaming data. It is a possible recording medium.

FIG. 1 is a schematic configuration diagram of an in-vehicle receiver according to an embodiment of the invention. FIG. 2 is a schematic configuration diagram of an in-vehicle receiver that searches for a channel when viewing cannot be performed. FIG. 3 is a schematic configuration diagram of an in-vehicle receiver that can perform channel search during viewing. FIG. 4 is an explanatory diagram of the data structure of an MPEG2-TS packet distributed by broadcast radio waves. FIG. 5 is an explanatory diagram of a detailed data structure of the packet of FIG. FIG. 6 is a diagram for explaining PID assignment in digital terrestrial broadcasting. FIG. 7 is a diagram illustrating the structure of a packet corresponding to the PAT in FIG. FIG. 8 is a diagram for explaining the structure of a packet corresponding to the PMT of FIG. FIG. 9 is a diagram illustrating a packet structure corresponding to the NIT in FIG. FIG. 10 is a detailed block diagram of the second generation block and the packet analysis unit of FIG.

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

FIG. 1 is a schematic configuration diagram of an in-vehicle receiver 1 according to an embodiment of the present invention.
The in-vehicle receiver 1 is mounted on a vehicle such as an automobile.
The in-vehicle receiver 1 is a receiving device that receives digital terrestrial television broadcast radio waves.

In digital terrestrial television broadcasting, elementary streams (ES: Elementary Stream) such as video content, audio content, and data broadcasting content of broadcast programs are converted to MPEG2-TS (Moving Picture Experts Group-Transport Stream) system transport streams. Packetize and store.
The transport stream is channel-modulated by an OFDM (Orthogonal Frequency-Division Multiplexing) method using a carrier wave having a frequency assigned to each broadcasting station, and distributed from the broadcasting station.
The frequency of the carrier wave is different for each broadcast area and for each base station.

1 includes a first antenna 11a, a second antenna 11b, a third antenna 11c, a fourth antenna 11d, a first tuner unit 12a, a second tuner unit 12b, a third tuner unit 12c, and a fourth tuner. A unit 12d, a channel decoding IC (Integrated Circuit) 31, a source decoding IC 32, a memory IC 16, a display unit 20, a microcomputer IC 33, and an operation unit 21.
In the in-vehicle receiver 1 of FIG. 1, the operation unit 21 selects a channel of a broadcasting station, receives a terrestrial digital television broadcast of the selected broadcasting station, and displays it on the display unit 20.
The user can view the broadcast program using the video content displayed on the display unit 20.

The four antennas of the first antenna 11a, the second antenna 11b, the third antenna 11c, and the fourth antenna 11d are antennas for receiving digital terrestrial television broadcasting.
The in-vehicle receiver 1 uses a plurality of antennas because it needs to receive radio waves while the vehicle is moving.
A receiver fixedly installed in a home or the like receives terrestrial digital television broadcasts with a single antenna, whereas the in-vehicle receiver 1 requires a plurality of antennas for good reception.
For example, space diversity can be realized by switching and using a plurality of antennas.
In addition, errors such as multipath can be reduced by combining radio waves received by a plurality of antennas.

The first antenna 11a is connected to the first tuner unit 12a. The second antenna 11b is connected to the second tuner unit 12b. The third antenna 11c is connected to the third tuner unit 12c. The fourth antenna 11d is connected to the fourth tuner unit 12d.
For example, the four tuner units of the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d receive broadcast radio wave signals from the antennas 11a to 11d connected thereto, for example. . The tuner units 12a to 12d convert the broadcast radio wave signals input from the antennas 11a to 11d into intermediate frequency signals using a mixer (not shown) using local transmission signals based on the reception settings of the microcomputer IC33.

The first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d are connected to the channel decoding IC 31.
The channel decode IC 31 generates a transport stream of a channel to be viewed from a plurality of broadcast radio waves received by the plurality of antennas 11a to 11d.
The channel decode IC 31 determines whether or not the received broadcast radio wave is a terrestrial digital television broadcast. In the case of terrestrial digital television broadcasting, demodulation operation is started and a transport stream is generated.
The channel decode IC 31 is, for example, a DSP (Digital Signal Processor). The DSP is a kind of microcomputer and has an AD (Analog to Digital) converter, a CPU (Central Processing Unit), and a memory. When the CPU executes a program stored in the memory, the carrier synthesizing unit 13, the first generation block 14, the second generation block 23, and the packet analysis unit 24 are realized in the channel decoding IC 31.
The program stored in the memory of the channel decoding IC 31 may be a program downloaded from a server device through the Internet or the like, or may be a program installed on a recording medium such as a CD-ROM (Compact Disc-Read Only Memory). .

The first generation block 14 generates a first transport stream.
The first transport stream is an MPEG2-TS transport stream.
The channel decode IC 31 outputs the first transport stream generated by the first generation block 14 to the source decode IC 32 as a transport stream for the channel to be viewed.

The second generation block 23 generates a second transport stream.
The second transport stream is an MPEG2-TS transport stream.
The second generation block 23 outputs the generated second transport stream to the packet analysis unit 24.
The packet analysis unit 24 analyzes the second transport stream.

The source decode IC 32 is connected to the channel decode IC 31.
A source transport IC 32 receives a transport stream of a channel to be viewed.
A memory IC 16 is connected to the source decoding IC 32.
The source decoding IC 32 executes DEMUX processing or the like on the input transport stream.
Thereby, the elementary stream of the broadcast program of the channel is extracted from the transport stream of the channel to be viewed.

  Each block in the channel decode IC 31 will be described later.

The source decoding IC 32 is a DSP, for example. The DSP is a kind of microcomputer and has a CPU and a memory. When the CPU executes the program stored in the memory, the source decoder IC 32 is supplied with the demultiplexer unit (DEMUX unit) 15, H.264, and the like. An H.264 decoder unit 17, an MPEG decoder unit 18, and a video / audio output switching unit 19 are realized.
The program stored in the memory of the source decoding IC 32 may be a program downloaded from a server device through the Internet or the like, or may be a program installed on a recording medium such as a CD-ROM.

A demultiplexer unit (DEMUX unit) 15 receives a transport stream of a channel to be viewed from the channel decoding IC 31.
The demultiplexer unit (DEMUX unit) 15 separates the content multiplexed in the transport stream for each elementary stream.
The demultiplexer unit (DEMUX unit) 15 separates, for example, an elementary stream for video content, an elementary stream for audio content, and an elementary stream for data broadcasting from the transport stream.
The separated elementary stream is temporarily stored in the memory IC 16.

In terrestrial digital broadcasting, the channel band assigned to each broadcasting station is used by being divided into 13 segments.
As an example, one segment in the center of the channel band is modulated by a QPSK (Quadrature Phase Shift Keying) method, and the remaining 12 segments are modulated by a 64 QAM (Quadrature Amplitude Modulation) method.

H. The H.264 decoder unit 17 is an H.264 decoder. Video content data encoded by the H.264 system and audio content data encoded by the AAC (Advanced Audio Coding) system are decoded.
The MPEG decoder unit 18 decodes video content data encoded by the MPEG2 system and audio content data encoded by the AAC system.
The video / audio output switching unit 19 One of the H.264 decoder unit 17 and the MPEG decoder unit 18 is selected.
The video / audio output switching unit 19 outputs a video signal or the like of the selected decoder unit.

The display unit 20 is a liquid crystal display device, for example.
The display unit 20 is connected to the source decoding IC 32.
The display unit 20 receives a video or audio signal from the source decoding IC 32.
The display unit 20 displays a video or data broadcast screen.

The operation unit 21 is, for example, a touch panel device or a key input device.
The operation unit 21 is connected to the microcomputer IC33.
The operation unit 21 outputs operation data based on a user operation to the microcomputer IC 33.

The microcomputer IC33 is connected to the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, the fourth tuner unit 12d, the channel decoding IC31, and the source decoding IC32.
The microcomputer IC33 has a CPU and a memory.
The receiver controller 22 is realized in the microcomputer IC 33 by the CPU executing the program stored in the memory.

The receiver control unit 22 controls the operation of the in-vehicle receiver 1.
For example, the receiver control unit 22 receives, based on the channel selected by the operation unit 21, the first tuner unit 12a, the second tuner unit 12b, and the third tuner so as to receive and reproduce the broadcast radio wave of the channel. The reception setting is executed for the unit 12c, the fourth tuner unit 12d, the channel decoding IC 31 and the source decoding IC 32.
When the broadcast radio wave being viewed is weakened, the receiver control unit 22 searches for broadcasts of the same program while continuing to reproduce the channel, and executes reception settings for switching to the searched broadcasts.
For channel search during viewing, the receiver control unit 22 performs operations for the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, the fourth tuner unit 12d, the channel decoding IC 31 and the source decoding IC 32. Execute the reception setting.
Thereafter, the receiver control unit 22 receives the broadcast radio wave of the searched channel and reproduces the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, the fourth tuner unit 12d, the channel. The reception setting is executed for the decode IC 31 and the source decode IC 32.

FIG. 2 is a schematic configuration diagram of a general in-vehicle receiver 1 that searches for a channel when viewing is not possible.
The channel decoding IC 81 of the in-vehicle receiver 1 in FIG. 2 includes a carrier synthesis unit 13 and a first generation block 14. The channel decode IC 81 generates a single transport stream.
The other parts in FIG. 2 are the same as those in FIG. 1 and will not be described.

The in-vehicle receiver 1 of FIG. 2 receives and reproduces one system of broadcast radio waves with the four antennas 11a to 11d.
The in-vehicle receiver 1 in FIG. 2 is a general 4-tuner carrier synthesis diver receiver.
There are roughly two types of on-vehicle receivers 1 for digital terrestrial television broadcasting.
The first type is a mobile receiver that receives a one-segment broadcast (layer A) in the center of the channel band.
The other type is a receiver for fixed reception that receives 12-segment broadcasting (B layer) on both sides of the channel band.
Some receivers for fixed reception can receive one segment at the center of the channel band.
The in-vehicle receiver 1 in FIG. 2 can receive one-segment broadcasting and 12-segment broadcasting.

When receiving a broadcast radio wave of a channel for viewing, the receiver control unit 22 in FIG. 2 receives the first radio wave of the channel selected by the operation unit 21 and reproduces the first tuner unit 12a, The second tuner unit 12b, the third tuner unit 12c, the fourth tuner unit 12d, the channel decoding IC 81, and the source decoding IC 32 are set for reception.
The first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d receive broadcast radio waves of the set channel.
The channel decoding IC 81 generates a transport stream based on the broadcast radio wave of the channel.
The source decoding IC 32 decodes the elementary stream extracted by the DEMUX unit 15. Thereby, video, audio data, and data broadcasting data of the broadcast program are generated.
The display unit 20 displays a moving image of the broadcast program based on the decoded data.
Thereby, in the in-vehicle receiver 1 of FIG. 2, the operation unit 21 can select the channel of the broadcast station, and can receive and reproduce the terrestrial digital television broadcast of the selected channel.
The user can view the video content displayed on the display unit 20.

By the way, in terrestrial digital broadcasting, the whole of Japan is divided into a plurality of areas, and the broadcasting is managed for each area. For example, in the Kanto wide area, each broadcaster's cover area is 7 prefectures.
For this reason, the frequency of the broadcast radio wave of the parent station that broadcasts the same program and the frequency of the broadcast radio wave of the relay station or affiliated station differ from region to region.
In current digital terrestrial television broadcasting in Japan, the SFN (Single Frequency Network) method in which the master station and the relay station form a relay network at the same frequency, and the MFN (Multi Frequency Network) method in which the relay network is formed at a different frequency Is adopted.
In such a broadcast environment, it cannot be said that each broadcast program is distributed at the same frequency (SFN) in all broadcast areas.
The channel frequency of each broadcast program becomes a different frequency in units of prefectures or lower blocks.
For this reason, the in-vehicle receiver 1 that is mounted on a vehicle and moves is required to switch the reception frequency to the frequency of the relay station when the vehicle goes out of the reception area of the master station, for example.
For example, when the in-vehicle receiver 1 leaves the area of the master station, the in-vehicle receiver 1 searches the reception frequency of the relay station or affiliated station that is broadcasting the program being viewed, and changes the channel to be watched to the channel of the relay station or affiliated station. There is a need to.
In order to continue viewing, it is necessary to execute a channel search during viewing and to switch the viewing frequency to the frequency of the searched station.

Next, channel search in the in-vehicle receiver 1 of FIG. 2 will be described.
In the in-vehicle receiver 1 of FIG. 2, for example, when the reception intensity of the broadcast wave of the channel being viewed decreases and the reception becomes impossible, the channel search is executed.
In the channel search, the receiver control unit 22 searches for broadcast waves of other broadcast stations that are broadcasting the same program. In the receiver control, search target channels are set in the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d.
The channel decode IC 81 synthesizes four broadcast radio signals based on the broadcast radio wave to be searched, and generates a transport stream included in the broadcast radio wave of the channel.
The source decoding IC 32 performs DEMUX processing of the transport stream and separates it into an elementary stream of a broadcast program and section data such as PSI / SI information.
The receiver control unit 22 compares the broadcast station specific data such as NIT in the PSI / SI information (section data) separated by the DEMUX and determines whether or not the broadcast contents of the channels match.
When the broadcast contents match, the receiver control unit 22 maintains the channel to be received at the channel and starts reception for viewing.
If the broadcast contents do not match, the receiver control unit 22 executes settings for receiving the broadcast radio wave of the next channel.
The receiver control unit 22 repeats the channel search until a channel for broadcasting the same broadcast program as the channel whose viewing is interrupted is obtained.
When a channel broadcasting a program whose viewing is interrupted is detected by the above channel search process, the in-vehicle receiver 1 in FIG. 2 switches the channel to be viewed to the detected channel.
The viewer can continue viewing the program whose viewing has been interrupted.

However, the channel decoding IC 81 in FIG. 2 can generate only one system of transport stream. During channel search, output of video and sound is generally stopped so that useless video and audio are not output.
For this reason, the in-vehicle receiver 1 in FIG. 2 cannot view the program during the channel search as described above.
Viewing of the program is interrupted by the channel search.
As a result, in the in-vehicle receiver 1 of FIG. 2, it takes time until the same program can be viewed after the channel being viewed cannot be received. During the long interruption period, the program is not reproduced and becomes silent.

  On the other hand, in order to prevent such interruption of viewing, the high-performance in-vehicle receiver 1 has a function of dividing the four tuner units into two or more groups and performing viewing and searching simultaneously in parallel. . Channel search during viewing is possible.

FIG. 3 is a schematic configuration diagram of the in-vehicle receiver 1 capable of channel search during viewing.
The in-vehicle receiver 1 in FIG. 3 includes a channel decode IC 91 and a source decode IC 92.
The other parts in FIG. 3 are the same as those in FIG. 1 and will not be described.

The channel decoding IC 91 of the in-vehicle receiver 1 in FIG. 3 includes a carrier synthesis unit 13, a first generation block 14, and a second generation block 23. The channel decoding IC 91 can generate two systems of transport streams.
When searching for a channel during viewing, the carrier synthesizing unit 13 selects the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d based on the setting of the receiver control unit 22. , For viewing and for search.

The source decode IC 92 includes the first demultiplexer unit (DEMUX unit) 15a, the first H.264, and the like. H.264 decoder unit 17a, first MPEG decoder unit 18a, first video / audio output switching unit 19a, second demultiplexer unit (DEMUX unit) 15b, 2H. 264 decoder unit 17b, second MPEG decoder unit 18b, and second video / audio output switching unit 19b.
First demultiplexer section (DEMUX section) 15a, first H. The H.264 decoder unit 17a, the first MPEG decoder unit 18a, and the first video / audio output switching unit 19a decode the first transport stream generated by the first generation block 14 of the channel decoding IC 91.
Second demultiplexer unit (DEMUX unit) 15b, 2H. The H.264 decoder unit 17b, the second MPEG decoder unit 18b, and the second video / audio output switching unit 19b decode the second transport stream generated by the second generation block 23 of the channel decoding IC 91.

Next, channel search processing during viewing in the in-vehicle receiver 1 of FIG. 3 will be described.
In the in-vehicle receiver 1 of FIG. 3, for example, when the reception intensity of the broadcast radio wave of the channel being viewed decreases, the receiver control unit 22 includes a first tuner unit 12a, a second tuner unit 12b, a third tuner unit 12c, The 4 tuner section 12d is divided into viewing and searching.
As a result, the first transport stream is output from the first generation block 14 to the source decoding IC 92. The source decode IC 92 includes the first demultiplexer unit (DEMUX unit) 15a, the first H.264, and the like. The H.264 decoder unit 17a, the first MPEG decoder unit 18a, and the first video / audio output switching unit 19a decode and output the first transport stream. The display unit 20 continues to display the program being viewed even during a channel search.
Further, the second transport stream is output from the second generation block 23 to the source decoding IC 92. The source decode IC 92 includes the second demultiplexer unit (DEMUX unit) 15b, the second H.264, and the like. The H.264 decoder unit 17b, the second MPEG decoder unit 18b, and the second video / audio output switching unit 19b decode and output the second transport stream.
The source decode IC 92 includes the second demultiplexer unit (DEMUX unit) 15b, the second H.264, and the like. The H.264 decoder unit 17b, the second MPEG decoder unit 18b, and the second video / audio output switching unit 19b decode and output the second transport stream.

Section data such as PSI / SI information generated by the source decoding IC 92 is input to the receiver control unit 22.
The receiver control unit 22 compares the program content of the second transport stream to be searched with the program content of the first transport stream being viewed using section data such as SI / SI information.
If these broadcast contents do not match, the receiver control unit 22 performs reception setting so as to receive and reproduce the broadcast radio wave of the next channel. The receiver control unit 22 repeats the above processing until a channel with the same broadcast content is obtained.
When the second transport stream having the same broadcast content is obtained, the receiver control unit 22 switches the channel to be received for viewing to the channel. The receiver control unit 22 returns the first tuner unit 12a, the second tuner unit 12b, the third tuner unit 12c, and the fourth tuner unit 12d to the four tuner synthesis, and views the second transport stream that is the search target. Switch to

With the above control, the in-vehicle receiver 1 in FIG. 3 can search for a channel during viewing, switch the viewing channel to the channel of the same program that has been searched, and can continue to receive the program being viewed.
The in-vehicle receiver 1 in FIG. 3 can search for a channel having a received electric field level higher than the channel currently being viewed, for example, and can switch the channel.
In addition, since the in-vehicle receiver 1 of FIG. 3 can receive and reproduce two programs simultaneously, reproduction for viewing is not interrupted during channel search.
Channels can be switched so that the program being viewed is played seamlessly.

As described above, in the expensive in-vehicle receiver 1 shown in FIG. 3, two sets of reception / reproduction systems are provided, and while one group continues viewing, the other group can search for a relay station. Further, by comparing the broadcast contents of both, the channel can be switched at an optimal timing.
However, in the in-vehicle receiver 1 of FIG. 3, it is necessary to use a high-function IC as the channel decoding IC 91 and the source decoding IC 92 in order to enable simultaneous reception of two systems. The channel decoding IC 91 needs to be able to output two MPEG2-TSs simultaneously and in parallel. The source decoding IC 92 needs to process two MPEG2-TSs simultaneously and in parallel. The channel decoding IC 91 and the source decoding IC 92 shown in FIG. 3 are more sophisticated and complex than the channel decoding IC 81 and the source decoding IC 32 shown in FIG.
As a result, the in-vehicle receiver 1 becomes complicated and expensive.

In the in-vehicle receiver 1 of FIG. 3, the channel decode IC 91 may be divided by the number of systems, and the source decode IC 92 may be divided by the number of systems.
In this case, a general-purpose IC corresponding to one system can be used as the channel decoding IC and the source decoding IC.
However, even in this modification, the number of ICs to be used is increased, the connection between ICs is complicated, and the in-vehicle receiver 1 is expensive compared to the in-vehicle receiver 1 that receives only one system in FIG. .

2 or 3, the transport stream of the channel to be searched is decoded by the source decoding ICs 81 and 91, and the receiver control unit 22 compares the decoded program contents for viewing. It is determined whether the program content of the middle channel matches the program content of the searched channel.
In this case, the in-vehicle receiver 1 in FIG. 2 needs to stop viewing the program for the search process.
In the in-vehicle receiver 1 of FIG. 3, the demultiplexer unit (DEMUX unit) 15 of the source decode IC 92, It is necessary to provide a plurality of H.264 decoder units 17, MPEG decoder units 18, and video / audio output switching units 19 for the number of systems.

Therefore, in this embodiment, channel search during viewing is realized while suppressing the complexity of the in-vehicle receiver 1.
As illustrated in FIG. 1, the channel decoding IC 31 is provided with a second generation block 23 and a packet analysis unit 24.
The packet analysis unit 24 determines whether the broadcast content of the first transport stream generated by the first generation block 14 matches the broadcast content of the second transport stream generated by the second generation block 23.
As a result, the in-vehicle receiver 1 of the present embodiment does not cause sound interruption or the like due to the channel search unlike the inexpensive in-vehicle receiver 1 of FIG. Further, unlike the expensive in-vehicle receiver 1 of FIG. 3, the receiver is not complicated and highly functional.

Hereinafter, the channel search process during viewing in this embodiment will be described.
4 and 5 are explanatory diagrams of the data structure of an MPEG2-TS packet 41 distributed by broadcast radio waves.
The upper part of FIG. 4 is an explanatory diagram of the data structure of the packet 41. The lower part is an explanatory diagram of a detailed data structure of the packet 41.
FIG. 5 shows the name, the number of bits, and the storage position in the packet 41 of each data included in the packet 41. The data is stored from the left side of the packet 41 in FIG. 4 in order from the upper data.

The transport stream is composed of a plurality of MPEG2-TS format packets 41.
A plurality of MPEG2-TS format packets 41 are arranged in time series in the transport stream.
An MPEG2-TS packet 41 has a header 42 and a payload 43, and has a basic packet size of 188 bytes.

The header 42 is data of the first 4 bytes of the packet 41.
The header 42 includes an 8-bit synchronization byte (sync byte), 1-bit transport error display bit, 1-bit payload unit start display bit, 1-bit priority display bit, 13-bit PID (Packet ID) ) Bit 44, 2 scramble control bits, 2 adaptation field control bits, 4 continuity counter bits.
In an MPEG2-TS transport stream, the structure of the header 42 is common to all packets 41 regardless of the type of packet 41 such as a packetized elementary stream (PES) packet or a section packet.

The synchronization byte indicates the head of the packet 41. This is a fixed value of 0x47 that is common to multiple types of packets 41. The in-vehicle receiver 1 detects the head of the packet 41 based on this value.
The transport error indication bit indicates whether or not there is a bit error in the packet 41. When a bit error is included, “1” is set.
The payload unit start indication bit indicates that the packet 41 includes the PES or the head data of the section.
The priority indication bit indicates the importance of the packet 41.
The PID bit 44 is 13-bit information for identifying the packet 41. The type of the packet 41 can be identified by the PID bit 44. In the present embodiment, it is used for determining matching of programs.
The scramble control bit is used to identify the presence / absence and type of the scramble in the payload 43 part.
The adaptation field control bit indicates the presence / absence of the adaptation field and the payload 43. If “01”, the payload 43 follows the header 42. If “10”, the header 42 is followed by an adaptation field. If “11”, the header 42 structure is followed by an adaptation field and a payload 43.
The continuity counter bit is a 4-bit cyclic count value that is incremented by one for each PID.

The 184 bytes in the latter half of the MPEG2-TS packet 41 are data bytes following the header 42. The data byte includes a payload 43 and / or an adaptation field. The data byte takes three types of data structures: an adaptation field and a payload (data body) 43, or an adaptation field and a payload 43.
The adaptation field is used, for example, as additional information such as PCR (Program Clock Reference) and stuffing of the surplus portion of each data.
The payload 43 stores content data of broadcast programs.
The data field of each packet 41 indicates which data structure is indicated by an adaptation field control bit. When the adaptation field control bit is “01” or “11”, the type of data specified by the PID bit 44 is stored in the payload 43.

The MPEG2-TS packet 41 for digital terrestrial broadcasting includes a packet for transmitting materials such as video and audio streams and data constituting the service.
In addition to this, information indicating the structure of a transport stream called PSI (Program Specific Information), program name called SI (Service Information), broadcast station information, and the like are transmitted to the MPEG2-TS packet 41. There is something to do.
These pieces of information are multiplexed into one transport stream.
By decoding the PSI / SI information on the receiving side, each data stream can be accurately determined.
In addition to video and audio elementary streams, multiple program streams can be accurately extracted from the transport stream.
In order to identify what kind of data is stored in each packet 41, an individual PID (Packet Identifier) is used for each type of payload 43 and data.
In analyzing the MPEG2-TS packet 41, first, it is necessary to know which PID corresponds to what data.

FIG. 6 is a diagram for explaining PID allocation in the MPEG2-TS packet 41 of digital terrestrial broadcasting.
FIG. 6 shows the table name, PID, and table ID.
The plurality of PIDs shown in FIG. 6 are reserved by the ARIB (Radio Industry Association) standard for terrestrial digital broadcasting in Japan.
In FIG. 6, for example, PAT (Program Associate Table), PMT (Program Map Table), NIT (Network Information Table), BIT (Broadcaster Information Table), etc. are shown as PIDs.
For example, the PID of the PAT is “0x0000” and the table ID is “0x00”. Such information is stored in the packet 41 of the PAT.

FIG. 7 is a diagram for explaining the structure of the section packet 41 corresponding to the PAT of FIG.
The PAT is a table showing a program structure. It is a table which matches service ID and PID of PMT.
As shown in FIG. 7, the PAT section packet 41 includes a table ID bit, a section syntax instruction bit, a fixed 0 bit, a reserve bit, a section length bit, a TSID (Transport Stream ID) bit, a reserve bit, and a version number bit. , Current next indication bit, section number bit, last section number bit, service ID bit, reserve bit (fixed to “111”), program map bit, PID or network ID bit, CRC 32 bit.
Reserve bits (fixed 111), program map bits, PID or network ID bits are repeated for the number of programs to be multiplexed.
In the PAT, all programs multiplexed in the transport stream of broadcast radio waves are described.
When analyzing the MPEG2-TS packet 41, first, it is necessary to detect this PAT (PID = 0x0000) and analyze the contents.

FIG. 8 is a diagram for explaining the structure of the section packet 41 corresponding to the PMT of FIG.
The PMT is a table for designating information on each elementary stream constituting a program and the corresponding PID. It is provided for each stream such as video and audio.
As shown in FIG. 8, the PMT is a table ID bit, a section syntax instruction bit, a fixed 0 bit, a reserve bit, a section length bit, a service ID bit, a reserve bit, a version number bit, a current next indication bit, a section. Number bit, last section number bit, reserve bit, PCR (Program Clock Reference) -PID bit, reserve bit, program information length bit, first loop (variable length) bit, CA descriptor bit, digital copy control descriptor bit, Emergency information descriptor bit, content utilization descriptor bit, stream type bit, reserve bit, ES PID bit, reserve bit, ES information bit, second loop (variable length) bit, CA descriptor bit, stream identification descriptor bit , Digital co With over control descriptor bits, video decoding control descriptor bits, CRC32 bits, the.
Stream type bit, reserve bit, ES PID bit, reserve bit, ES information bit, second loop (variable length) bit, CA descriptor bit, stream identification descriptor bit, digital copy control descriptor bit, video decode control description The child bit is repeated for each elementary stream.
Thus, the PMT describes the PID, the type of elementary stream, and the PCR referred to by the program. Further, an area for describing additional information called a descriptor is provided. It is also possible to add information about the corresponding service as a whole or individual streams.

FIG. 9 is a diagram illustrating the structure of the section packet 41 corresponding to the NIT in FIG.
The NIT is a table that describes information about a transmission path such as a broadcast song or a broadcast network. In digital terrestrial broadcasting, it is used in channel search. The NIT is an important table used when searching for or scanning a relay station in terrestrial digital broadcasting.
The service ID “0x0000” is a number dedicated to NIT.
When the NIT exists in the transport stream, the NIT is described in the same format as the PMT.
As shown in FIG. 9, NIT is a table ID bit, a section syntax instruction bit, a fixed 0 bit, a reserved bit, a section length bit, a network ID bit, a reserved bit, a version number bit, a current / next indication bit, a section. Number bit, last section number bit, reserve bit, network descriptor length bit, first loop (variable length) bit, network name descriptor bit, system management descriptor bit, reserve bit, TS loop length bit, TSID bit, original Network ID bit, Reserve bit, Transport descriptor length bit, Second loop (variable length) bit, Service list descriptor bit, Terrestrial distribution system descriptor bit, Partial reception descriptor bit, TS information descriptor bit Door, with CRC32 bit, the.
TSID bit, original network ID bit, reserve bit, transport descriptor length bit, second loop (variable length) bit, service list descriptor bit, ground distribution system descriptor bit, partial reception descriptor bit, TS information descriptor The bits are repeated for each transport stream.

The BIT is a table describing information on the terrestrial broadcaster and information on transmission parameters.
The BIT includes an affiliation ID that can be used for determination of affiliated stations.

FIG. 10 is a block diagram showing a detailed configuration of the second generation block 23 and the packet analysis unit 24 of the channel decoding IC 31 of FIG.
In FIG. 10, the first AD converter 51a, the second AD converter 51b, the first orthogonal demodulator 52a, the second orthogonal demodulator 52b, the first FFT (Fast Fourier Transform) 53a, the second FFT 53b, and the carrier synthesizer 13 are also shown. It is shown in the figure.
FIG. 10 shows that the second generation block 23 uses the second transport port from the OFDM intermediate frequency signal of the third tuner unit 12c and the OFDM intermediate frequency signal of the fourth tuner unit 12d in the channel search process during viewing. It is an example in the case of generating a stream.
In the channel search process during viewing, the first transport stream is output to the source decoder IC. Thereby, viewing of the program by the first transport stream can be continued during the channel search process. On the other hand, the second transport stream for search is not output to the source decoder IC.

  10 includes a frequency deinterleaving unit 55, a time deinterleaving unit 56, a demapping unit 57, a parallel-serial conversion unit 58, a bit layer separation unit 59, a first bit deinterleaving unit 60a, and a second bit. Deinterleave unit 60b, third bit deinterleave unit 60c, first depuncture unit 61a, second depuncture unit 61b, third depuncture unit 61c, bit layer synthesis unit 62, NULL packet insertion unit 63, Viterbi decoding unit 64, byte layer Separator 65, first byte deinterleaver 66a, second byte deinterleaver 66b, third byte deinterleaver 66c, first energy despreader 67a, second energy despreader 67b, third energy despreader 67c, a byte layer synthesis unit 68, and an RS decoding unit 69.

The OFDM intermediate frequency signal of the third tuner unit 12c is digitally converted by the first AD converter 51a, demodulated by the first orthogonal demodulator 52a, and frequency-converted by the first FFT 53a. The intermediate frequency signal of the third tuner unit 12c is converted into a baseband signal discretized by the first AD conversion unit 51a, and data is demodulated by the first FFT 53a.
The OFDM intermediate frequency signal of the fourth tuner unit 12d is digitally converted by the second AD converter 51b, demodulated by the second orthogonal demodulator 52b, and frequency-converted by the second FFT 53b. The intermediate frequency signal of the fourth tuner unit 12d is converted into a baseband signal discretized by the second AD conversion unit 51b, and data is demodulated by the second FFT 53b.
The carrier combining unit 13 combines the output signal of the first FFT 53a and the output signal of the second FFT 53b. The carrier synthesizing unit 13 synthesizes the result of the FFT.
Thereby, compared with the case where a broadcast wave is received by a single antenna, influences such as fading are suppressed.

In the carrier-combined signal, the order of the OFDM subcarriers is rearranged by the frequency deinterleaving unit 55, and the order of the signals is rearranged by the time deinterleaving unit 56. Thereafter, the data is demodulated by the demapping unit 57 and the data is converted by the parallel-serial conversion unit 58.
The data string output from the parallel / serial conversion unit 58 is separated by the bit layer separation unit 59, for example, every three layers. The order of the data in the first layer is changed bit by bit by the first bit deinterleave unit 60a, and redundant data is added by the first depuncture unit 61a. The order of the data of the second layer is changed in bit units by the second bit deinterleave unit 60b, and redundant data is added by the second depuncture unit 61b. The order of the data in the third layer is changed in bit units by the third bit deinterleave unit 60c, and redundant data is added by the third depuncture unit 61c. The first layer, the second layer, and the third layer are, for example, a one-segment broadcast (layer A) that is a central segment of a band allocated to a broadcasting station, and a broadcast by six segments on one side of a frequency band (layer B) Part), corresponding to broadcasting by the six segments on the other side of the frequency band (the rest of the B layer). The data of the first hierarchy, the data of the second hierarchy, and the data of the third hierarchy are synthesized by the bit hierarchy synthesis unit 62.

A NULL packet 41 is inserted by the NULL packet insertion unit 63 into the transport stream in which the bit error in each layer is corrected.
The Viterbi decoding unit 64 decodes the convolutional code of the transport stream and executes error correction.

The Viterbi-decoded transport stream is separated by the byte layer separation unit 65, for example, every three layers. The order of the data in the first layer is changed in byte units by the first byte deinterleave unit 66a, and the pseudo noise sequence used for encoding is multiplied by the first energy despreading unit 67a. The order of the data of the second layer is exchanged in units of bytes by the second byte deinterleaving unit 66b, and the pseudo-noise sequence used for encoding is multiplied by the second energy despreading unit 67b. The order of the data in the third layer is changed in units of bytes by the third byte deinterleave unit 66c, and the pseudo-noise sequence used for encoding is multiplied by the third energy despreading unit 67c. The first layer data, the second layer data, and the third layer data are combined by the byte layer combining unit 68 and returned to the transport stream.
The RS decoding unit 69 decodes the combined transport stream and executes error correction.

The channel decoding IC 31 illustrated in FIG. 10 includes a packet analysis unit 24 that analyzes the second transport stream, in addition to the second generation block 23 having the above configuration.
The packet analysis unit 24 includes a PID filter setting unit 71, a packet filter 72, a packet comparison unit 73, an information match determination unit 74, and a channel switching instruction unit 75.

The second transport stream is streaming data in which MPEG2-TS packets 41 shown in FIGS. 4 and 5 are arranged in time series. Streaming data has a data structure in units of packets.
Further, for example, as illustrated in FIGS. 6 to 9, the second transport stream includes a packet 41 of the PID allocation table, a PAT packet 41, a PMT packet 41, an NIT packet 41, a BIT packet 41, and the like. Is included.

The PID filter setting unit 71 sets, for example, the PID value of the packet 41 used for the broadcast program match determination among the plurality of types of packets 41 included in the second transport stream.
The PID filter setting unit 71 can be configured by a memory capable of storing a PID value, for example.
For the channel search during viewing, the receiver control unit 22 sets, for example, the NIT PID value of the broadcasting station currently being viewed in the PID filter setting unit 71. The NIT PID value of the first transport stream being viewed is set.

  The packet filter 72 separates the packet 41 from the second transport stream.

The packet comparison unit 73 compares each separated packet 41 with, for example, the NIT packet 41 of the first transport stream.
The packet comparison unit 73 compares bits in a predetermined order from the beginning of a specific packet.

The information match determination unit 74 determines the match between the broadcast station information of the second transport stream and the broadcast station information of the first transport stream based on the comparison result in the packet comparison unit 73.
The information match determination unit 74 determines these matches by bit comparison.
When the broadcast station information of the extracted packet 41 is the same as the broadcast station information of the set packet 41 of the NIT, the information coincidence determination unit 74 broadcasts the program in which the searched channel is the same as the channel being viewed. Judge that you are doing.

The channel switching instruction unit 75 outputs a switching signal to the receiver control unit 22 when the information match determination unit 74 determines that the broadcast station information matches.
Based on the input of the switching signal from the channel switching instruction unit 75, the receiver control unit 22 switches the channel to be viewed to the searched channel.

Next, a specific example of the operation of the packet analysis unit 24 in FIG. 10 will be described.
The PID specified in the following operation example is merely an example.

When the electric field strength of the broadcast radio wave being viewed decreases, the receiver control unit 22 starts a channel search.
The receiver control unit 22 sets, for example, the PID value of the PAT packet 41 of the broadcasting station currently being viewed in the PID filter setting unit 71.

The packet filter 72 separates the second transport stream data in units of packets 41.
The packet 41 of the second transport stream has a fixed value of “0x47” in the leading synchronization byte.
The packet filter 72 detects a synchronization byte for the second transport stream, and separates data up to the next synchronization byte as a packet 41.

The packet comparison unit 73 extracts the packet 41 including broadcast station information from the plurality of packets 41 separated by the packet filter 72.
In each extracted packet 41, the lower 13 bits of the data of 2 bytes following the synchronization byte indicate the PID value of the packet 41.
The packet comparison unit 73 acquires the lower 13 bits from each extracted packet 41 for bit comparison.
The packet comparison unit 73 performs bit comparison between the acquired lower 13 bits and the PID value of the currently viewed PAT packet 41 set in the PID filter setting unit 71. The PID value of the packet 41 being viewed is, for example, “0x0000”.

If the PID value of the packet 41 matches the PID value of the currently viewed PAT packet 41 by bit comparison, the information match determination unit 74 decodes the PAT information stored in the payload 43 of the packet 41.
The information match determination unit 74 determines whether or not the broadcast station information obtained by decoding matches the broadcast station information being viewed.
The PAT packet 41 shown in FIG. 7 includes a TSID in the third byte from the beginning. TSID is a value unique to each broadcasting station.
The information match determination unit 74 determines, for example, a match between the TSID of the searched relay station and the TSID of the currently viewed broadcast station. And when these TSIDs correspond, it determines with the broadcasting station which is broadcasting the same program.
In this case, the information coincidence determination unit 74 acquires 16-bit data from the 17th bit from the top of the PAT packet 41, and performs bit comparison with the data of the TSID bit of the broadcasting station currently being viewed.

When the information matching determination unit 74 determines that the TSIDs match, the channel switching instruction unit 75 outputs a channel switching signal to the receiver control unit 22.
The receiver control unit 22 switches the channel to be viewed to the searched channel.
The receiver control unit 22 sets the searched channel in the first reproduction block.
The first playback block generates a transport stream of the searched channel as a first transport stream.

When searching for an affiliated station instead of a relay station, the receiver control unit 22 may set the PID value of the BIT packet 41 in the PID filter setting unit 71, for example.
The BIT packet 41 has an affiliation ID.
The receiver control unit 22 determines whether or not the value of this affiliation ID (takes 0 to 7) matches the affiliation ID being viewed, so that the searched channel is the broadcasting station being viewed. It can be determined whether or not the affiliated station.

As described above, the in-vehicle receiver 1 of the present embodiment includes the packet analysis unit 24 in the channel decoding IC 31 that generates the first transport stream of the channel to be viewed.
The packet analysis unit 24 compares the broadcast station information included in the first transport stream of the channel being viewed with the broadcast station information of the second transport stream of the other channel searched in the channel search being viewed. To do.
Therefore, the source decoding IC 32 of this embodiment may decode one system transport stream. For example, a general-purpose one system can be used for the source decoding IC 32.
The in-vehicle receiver 1 is simplified and cheaper than that of FIG.
The channel decoding IC 31 decodes the first transport stream being viewed and also decodes the second transport stream of the channel to be searched. The in-vehicle receiver 1 can search for a channel without interrupting viewing as in the case of FIG.
The first generation block 14 of the channel decoding IC 31 is instructed by the receiver control unit 22 to switch the searched channel.
The in-vehicle receiver 1 can switch the channel to be viewed to the channel of the program having the same content as that being viewed while continuing viewing.

  In the present embodiment, the packet analysis unit 24 is incorporated in the channel decoding IC 31 together with the second generation block 23. Therefore, unlike the case where the packet analysis unit 24 is provided separately from the channel decoding IC 31, the structure of the in-vehicle receiver 1 is not complicated.

  In the present embodiment, taking advantage of the channel decoding IC 31 capable of synthesizing four tuner carriers, a channel search during viewing that is inexpensive and has the same video / sound break as the conventional high-performance in-vehicle receiver 1 is possible. realizable.

The packet analysis unit 24 of the present embodiment extracts a predetermined packet 41 from the second transport stream to be searched, and determines whether the extracted broadcast station information matches the packet 41 by bit comparison.
The packet analysis unit 24 can determine whether broadcast station information matches using a broadcast station-specific number (TSID) included in a transport stream of digital terrestrial broadcast radio waves, an affiliation ID assigned to each affiliated station, and the like.
Therefore, unlike the prior art, it is not necessary to determine the same broadcast content based on MPEG2-TS streaming data after DEMUX processing.
For example, the packet analysis unit 24 can determine the same program based on information included in the decoded second transport stream.
Compared with the case where the broadcast contents are determined to be identical based on the MPEG2-TS streaming data after the DEMUX process, the configuration and operation for determining the match can be simplified.

In the present embodiment, the packet analysis unit 24 of the channel decode IC 31 outputs a result of determining whether the broadcast station information matches, to the microcomputer IC 33.
Then, the first generation block 14 of the channel decoding IC 31 switches the channel to be viewed to the searched channel according to the setting of the receiver control unit 22 of the microcomputer IC 33.
Therefore, it is not necessary to add a channel switching function or the like to the channel decoding IC 31.
The channel switching after the channel search can be controlled by the receiver control unit 22 that controls the channel.

  The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications or changes can be made without departing from the scope of the invention.

For example, the said embodiment is the vehicle-mounted receiver 1 which receives terrestrial digital television broadcasting.
In addition, for example, the receiver may be a mobile phone, a multi-function mobile terminal, or the like.
The receiver may receive digital broadcasts such as satellite digital television broadcasts and digital radio broadcasts.

1 In-vehicle receiver (receiver)
14 1st production | generation block (1st production | generation part)
22 Receiver control unit (control unit)
23 Second generation block (second generation unit)
24 packet analysis unit 41 packet 72 packet filter (dividing unit)
73 Packet comparison unit (extraction unit)
74 Information match determination unit (determination unit)
31 channel decoding IC (integrated circuit for demodulation)
32 Source decoding IC (decoding integrated circuit)

Claims (8)

From received signals including broadcast radio signals of multiple channels,
A first generation unit that generates first streaming data including broadcasting station information of a broadcasting station as streaming data of a viewing channel, and second streaming data of a channel different from the viewing channel is generated. An integrated circuit for demodulation having two generation units;
A decoding integrated circuit connected to the demodulation integrated circuit and decoding the first streaming data of the viewing channel;
Have
The demodulation integrated circuit includes:
A determination unit that determines a match between broadcast station information of a broadcast station that broadcasts the channel to be viewed and broadcast station information of a broadcast station that is broadcasting a channel different from the channel to be viewed;
A receiving apparatus. The demodulation integrated circuit includes:
A dividing unit for dividing the second streaming data of the other searched channels into packets;
An extraction unit for extracting packets of the broadcast station information from the plurality of divided buckets;
Have
The determination unit
Determining whether the broadcast station information included in the extracted packet matches the broadcast station information included in the first streaming data being viewed;
The receiving apparatus according to claim 1. The determination unit
From the extracted packet, obtain data of a predetermined position to store the broadcasting station information,
A bit comparison is made between the acquired data and broadcast station information data included in the first streaming data being viewed.
The receiving apparatus according to claim 2. The first generator is
When the determination unit determines that the broadcast station information matches, the streaming data to be generated is switched from the first streaming data being viewed to the searched second streaming data.
The receiving apparatus according to any one of claims 1 to 3, wherein A controller connected to the demodulation integrated circuit and setting a channel to be viewed in the first generator;
The controller is
Based on the determination result of the determination unit input from the demodulation integrated circuit, the search target channel determined to match the broadcast station information is set in the first generation unit.
The receiving apparatus according to claim 4. A channel search method in a receiver having a demodulation integrated circuit for generating first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels and a decoding integrated circuit for decoding the first streaming data. ,
The demodulation integrated circuit includes:
Generating the first streaming data of the channel being viewed and the second streaming data of a channel different from the channel being viewed;
Determining a match between the broadcast station information of the first streaming data and the broadcast station information of the second streaming data;
A channel search method characterized by the above. Demodulating integrated circuit in a receiving device having a demodulating integrated circuit that generates first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels, and a decoding integrated circuit that decodes the first streaming data A program executed by a computer as
The demodulation integrated circuit comprises:
Generating the first streaming data of the channel being viewed and the second streaming data of a channel different from the channel being viewed;
Determining a match between the broadcast station information of the first streaming data and the broadcast station information of the second streaming data;
A program characterized by that. Demodulating integrated circuit in a receiving device having a demodulating integrated circuit that generates first streaming data of a channel to be viewed from broadcast radio waves of a plurality of channels, and a decoding integrated circuit that decodes the first streaming data A recording medium on which a program executed by a computer is recorded,
The demodulation integrated circuit comprises:
Generating the first streaming data of the channel being viewed and the second streaming data of a channel different from the channel being viewed;
Determining a match between the broadcast station information of the first streaming data and the broadcast station information of the second streaming data;
The computer-readable recording medium which recorded the program characterized by the above-mentioned.

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