JP3906592B2 - Receiving apparatus and receiving method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a receiving device.And receiving methodFor example, the present invention can be applied to a receiver (IRD: Integrated Receiver Decoder) of a digital satellite broadcasting system. The present invention integrates a recording device into a receiving device for multi-channel broadcasting, and records the data that has been compressed and broadcasted without decompressing the data, thereby effectively utilizing the characteristics of the program that is broadcast on the multi-channel. Thus, a desired program can be recorded with a simple configuration as a whole.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a digital satellite broadcasting system, audio data and video data are compressed and time-division multiplexed and transmitted so that multiple channels can be broadcasted by one broadcast wave. In such a digital satellite broadcasting system using multi-channel broadcasting, a desired program can be selected by PSI (Progrlam Specific Information) transmitted in a time-division multiplexed manner together with the video data and the audio data.
[0003]
That is, FIG. 2 is a block diagram showing a basic configuration of the ground station 1 in this type of digital satellite broadcasting system. In the ground station 1, video data DV and audio data DA are input to an image encoder 2 and an audio encoder 3, respectively, where data compression is performed. Here, these data compressions are performed according to ITU-T recommendation H.264. 262 It is defined in ISO / IEC13818-2 and ISO / IEC13818-3.
[0004]
In the digital satellite broadcasting system, for example, such video data DV and audio data DA constitute a program (program) which is one channel. The ground station 1 generates a video data elementary stream ESV and an audio data elementary stream ESA, which are data strings of the compressed video data DV and audio data DA, respectively.
[0005]
In this data compression, in the video data DV, as shown in FIG. 3, continuous pictures are encoded by being divided in units of GOP (Group Of Pictures), and the data compressed at the head of each GOP. A header describing the type of encoding process and the like is assigned. On the other hand, in the audio data DA, data compression processing is executed in units of audio frames instead of GOPs, and a header is similarly assigned to each audio frame.
[0006]
As shown in FIG. 4, the packetizers 4 and 5 packetize and output these elementary streams ESV and ESA, respectively. At this time, the packetizers 4 and 5 concatenate GOPs and audio frames constituting the elementary streams ESV and ESA, respectively, and packetize them in units of predetermined data blocks. Further, time information at the time of reproduction, a stream ID indicating the type of packetized data, and the like are added, and a PES (Program Elementary Stream) header is added to the head.
[0007]
Thus, the packetizers 4 and 5 generate data streams (PES) PESV and PESA composed of video data, audio data, and the like, which are data-compressed according to the packet structure. Such a PES packet is also applied to data broadcasting and the like.
[0008]
The multiplexing device 6 time-division multiplexes these PESs to create one transport stream TS. That is, as shown in FIGS. 5 and 6, the multiplexing apparatus 6 delimits each PES in units of 184 bytes and adds a transport stream header. Here, the transport stream header is assigned PID (Packet ID) for identifying the PES, time information that is a reference for decoding and display, and the like, and the transport stream packet as a whole becomes 188 bytes as necessary. Staff bits are assigned.
[0009]
The multiplexing device 6 generates a transport stream TS by time-division multiplexing the transport stream packets generated in this way.
[0010]
On the transmission side, a transport stream TS, which is a multiplexed stream, is generated from video data DV and audio data DA by a plurality of programs in this way, and the transport stream thus generated is frequency-multiplexed to obtain a satellite. Has been made to uplink to.
[0011]
In the transport stream TS multiplexed in this way, the PID assigned to each transport stream packet is set to a unique value in each elementary stream, so that when receiving, 1 is set with reference to this PID. The transport stream packets constituting one program can be selected, and the transport stream TS selected in this way is processed in reverse to the transmission time so that a desired program can be auditioned.
[0012]
On the transmission side, in order to specify this PID, a transport stream TS is transmitted via PSI.
[0013]
Here, as shown in the flow of program selection in FIG. 7, the PSI is composed of a PAT (Program Association Table), a PMT (Program Map Table), etc., and the PID is the same as the transport stream of video data and audio data, respectively. Assigned. Among these, the PMT is assigned to each program, and the PIDs of elementary streams constituting each program are assigned. Therefore, in the example shown in FIG. 7, one program is composed of elementary streams based on PIDs of XV, XA, XD, and XC specified by the PMT.
[0014]
On the other hand, the PAT specifies the PMT assigned to each program in this way. In this example, the PMT having the program number X is assigned to the PIDXX packet. ing. A specific PID (usually 0) is assigned to the PAT.
[0015]
As a result, on the receiving side, the PMT of the program desired to be received is detected from the PAT, and the PID packet specified by this PMT is selectively processed to select the desired program.
[0016]
[Problems to be solved by the invention]
By the way, when the program received in this way is auditioned by a conventional time shift or the like, it is once recorded and reproduced on an external device such as a video tape recorder. In the case of a music broadcast program, the program is temporarily recorded and reproduced on an external device such as a cassette tape recorder.
[0017]
On the other hand, if this type of program can be recorded by effectively utilizing the characteristics of the program broadcast on multiple channels as described above, this type of program can be recorded with a simple structure as a whole. It is considered possible.
[0018]
  The present invention has been made in consideration of the above points, and can effectively use the characteristics of a program broadcast on multiple channels and record a desired program with a simple structure as a whole.And receiving methodIs to try to propose.
[0019]
[Means for Solving the Problems]
  In order to solve this problem, the present invention is provided with a recording means for recording video data and / or audio data compressed by the data output from the selection means on the recording medium in a state where the data is compressed.Also, recording on the recording medium is controlled based on the control data.
[0020]
  By providing recording means for recording video data and / or audio data compressed by the output from the selection means onto a recording medium in a state where the data is compressed, the program is data-compressed and broadcast on multiple channels. After each data decompression, the program can be recorded without being compressed again, and this program can be recorded at a high density. A desired program can be recorded according to the configuration.Also, by controlling the recording to the recording medium based on the control data, it is possible to record only the desired contents except unnecessary conversations, thereby creating an optical disk equivalent to a compact disk or DVD, for example. Thus, these media can be electronically distributed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0022]
(1) Configuration of the embodiment
FIG. 1 is a block diagram showing a receiving apparatus according to an embodiment of the present invention. The receiving apparatus 10 receives broadcast waves that are uplinked from the ground station 1 described above with reference to FIG. 2 and downlinked from the satellite.
[0023]
That is, in the receiving apparatus 10, the antenna 11 down-converts a broadcast wave downlinked from the satellite and outputs it to the tuner 12, and the tuner 12 selects a desired broadcast wave under the control of the central processing unit (CPU) 13. And output. The decoder 14 decodes the output signal of the tuner 12 and outputs a transport stream TS.
[0024]
The demultiplexer (DEMUX) 15 selects PAT, PMT, and EPG (Electronic Program Guide) from the transport stream TS and outputs them to the central processing unit 13, and is specified by the PMT under the control of the central processing unit 13. A predetermined packet to be selected is selected. In the normal operation mode, the demultiplexer 15 performs video and audio decoders 16 and 16 respectively for elementary streams based on video data and audio data according to the types of packets based on these PIDs specified in the PMT. The data stream elementary stream is output to the bus BUS. On the other hand, in the program recording mode, an elementary stream based on video data and audio data is output to the bus BUS, and when data broadcasting content is recorded, the data broadcasting element is similarly used. The mental stream is output to the bus BUS. On the other hand, at the time of program playback, instead of the transport stream TS output from the decoder 14, the video data and audio data elementary streams output to the bus BUS are converted into video and audio decoders 16 and 16, respectively. 17 to output.
[0025]
The decoders 16 and 17 decompress the elementary streams of the video data and audio data, respectively, and output video data and audio data. The encoder 18 receives the video data output from the decoder 16 (comprised of luminance data and color difference data because the video data compressed by MPEG is decompressed), and the video data is digitally converted. Analog conversion processing is performed to generate a luminance signal and a color difference signal. The encoder 18 combines the luminance signal and the color difference signal to generate a composite video signal SV and outputs it to an external device such as a monitor device.
[0026]
A digital / analog conversion circuit (D / A) 19 performs a digital / analog conversion process on the audio data output from the decoder 17 and outputs an audio signal SA based on an analog signal.
[0027]
The recording / reproducing unit 20 is an optical disk device integrated with the receiving device 10 and switches its operation under the control of the central processing unit 13 to record an elementary stream by video data and audio data output to the bus BUS. Record on media. Here, the recording medium is an optical disk, and the recording / reproducing unit 20 holds the optical disk in a detachable manner. As a result, the recording / reproducing unit 20 can record a program by digital satellite broadcasting using removable media. The recording / reproducing unit 20 reproduces an elementary stream based on video data and audio data recorded on the optical disc under the control of the central processing unit 13 and outputs the reproduced elementary stream to the bus BUS. Thereby, in the receiving apparatus 10, the broadcast program is temporarily recorded on the optical disc and can be auditioned by time shift, for example.
[0028]
In this way, the recording / reproducing unit 20 that records and reproduces the elementary stream records the elementary stream based on the video data and the audio data on the optical disc without decompressing the data. As a result, the recording / reproducing unit 20 records the compressed video data and audio data, which are characteristic of multi-channel broadcasting, without decompressing the data one by one, and records a desired program at a high density. Further, after the data decompression, the overall configuration is prevented from becoming complicated as in the case of compressing the data, so that the receiving apparatus 10 effectively utilizes the characteristics of the program broadcast on multiple channels as a whole. A desired program is recorded with a simple configuration.
[0029]
Further, the recording / reproducing unit 20 records the additional information sent from the central processing unit 13 to the bus BUS on the optical disk prior to the recording of the video data and the audio data. Here, the additional information is information relating to video data and audio data that can be acquired, and in addition to the recorded date and time, program information of the program acquired from the EPG is assigned. As a result, the recording / playback unit 20 can search for a program recorded on the optical disk by using this program information when the program is auditioned again, and the program information that is characteristic of multi-channel broadcasting can be effectively used. It can be used to improve usability. That is, the recording / reproducing unit 20 reproduces this additional information under the control of the central processing unit 13 and outputs it to the bus BUS, thereby displaying the program information on the monitor device which is an external device.
[0030]
The floppy disk drive (FDD) unit 22 records an elementary stream for data broadcasting output to the bus BUS under the control of the central processing unit 13. As a result, the receiving apparatus 10 can download, for example, a recipe introduced in a cooking program, a game program, and the like to a floppy disk.
[0031]
The central processing unit 13 is a controller that controls the overall operation of the receiving apparatus 10, acquires EPG, PAT, and PMT from the demultiplexer 15 in response to a user operation, and acquires packets specified by the PMT. The demultiplexer 15 is instructed. Further, in a normal operation mode, the output of each elementary stream to the decoders 16 and 17 is instructed to the demultiplexer 15, and further, the decoders 16, 17 and the encoder 18 are instructed to process these elementary streams.
[0032]
In this state, for example, when the user instructs recording of data broadcasting, the central processing unit 13 instructs the demultiplexer 15 to acquire a packet by data broadcasting, and further instructs transmission of the acquired data to the bus BUS. Further, the central processing unit 13 removes the header from this packet, extracts data, and sends this data to the bus BUS. The central processing unit 13 instructs the floppy disk drive unit 22 to record data to be sent to the bus BUS, thereby recording data from the data broadcast on the floppy disk.
[0033]
On the other hand, when the user gives an instruction to record a program, or when the recording start time by timer reservation comes, the central processing unit 13 sends additional information and instructs the recording / reproducing unit 20 to record the additional information. Further, the central processing unit 13 instructs the demultiplexer 15 to output an elementary stream based on video data and audio data to the bus BUS. Further, the central processing unit 13 instructs the recording / reproducing unit 20 to record the elementary stream output to the bus BUS. Conversely, when the recording end time is reached, the recording / reproducing unit 20 is instructed to end recording.
[0034]
In this data transfer, the central processing unit 13 removes the header from the transport stream packet output from the demultiplexer 15 to the bus BUS, extracts the data, and the data is recorded via the bus BUS. This is executed by sending to 20.
[0035]
On the other hand, when the user designates recording of a program based on the PMT, the central processing unit 13 instructs the recording of the program based on the control data recorded in the PMT.
[0036]
Here, in this embodiment, the ground station 1 (FIG. 2), for example, when playing music in a program, or when broadcasting a movie or the like, starts broadcasting music, at the end of broadcasting, starting broadcasting a movie, The end point of the broadcast is specified by this control data. Here, for example, when the program is based on a pre-edited stream, the ground station 1 identifies the start time and end time of broadcasting of such music, movies, etc. by using markers set at the time of editing. This control data is created based on time information indicating the time. In a real-time program such as live broadcasting, for example, a marker that designates the start of music transmission or the like for a predetermined time is detected, and the control data is generated by specifying the broadcasting time of music, a movie, or the like using this marker.
[0037]
The central processing unit 13 uses the control data as a reference, for example, when program guidance for the next week, commentary on the movie, etc. are finished and the original movie starts broadcasting in the program. When the conversation is finished and music broadcasting is started, the operation of the recording / reproducing unit 20 is controlled so as to record these elementary streams. Further, when the original movie is finished by this control data, the stop of recording is instructed, thereby preventing the subsequent notice from being recorded. In the case of a music program, the recording of the program is stopped when the music is over, and a disc jockey conversation or the like is not recorded.
[0038]
(2) Operation of the embodiment
In the above configuration, in this digital satellite broadcasting system (FIG. 2), audio data and video data constituting each program are compressed, and then time-division multiplexed with data of the data broadcasting etc. to transport stream TS. Is generated. In the digital satellite broadcasting system, the transport stream TS is modulated and uplinked to the satellite, and the broadcast wave is downlinked from the satellite.
[0039]
When the transport stream TS is generated in this way, in the digital satellite broadcasting system, the PMT that specifies the transport stream packet of each program by the PID and the PAT that specifies the PMT packet of each program by the PID are the same. It is multiplexed with video data, audio data, etc. and sent out. Also, for example, when starting and ending the broadcast of the original movie excluding the next week's program guide, commentary on the movie, etc., and when the original music broadcast starts except for the disc jockey conversation in the music program, and Time information for specifying the end point or the like is assigned to the PMT and transmitted as control data.
[0040]
The broadcast wave transmitted in this way and downlinked from the satellite (FIG. 1) is selected by the tuner 12 and then the transport stream TS of the selected broadcast wave is demodulated by the decoder 14. Is done. In this transport stream TS, a packet specified by PAT and PMT is selected by a demultiplexer 15, and video data is decompressed by a decoder 16 and then output to an external device via an encoder 18. Audio data is decompressed by the decoder 17 and then converted to an analog audio signal by the digital-analog conversion circuit 19 and output to an external device.
[0041]
The video data and audio data processed in this way are separated by the demultiplexer 15 by the user's operation, sent to the bus BUS, and recorded on the optical disc by the recording / playback unit 20. As a result, the audio data and video data are recorded on the optical disc in a state where the data is compressed without being decompressed. As a result, in this embodiment, it is possible to record the compressed video data and audio data, which is a feature of multi-channel broadcasting, without decompressing the data one by one, and to record a desired program at high density. In addition, the overall configuration can be simplified as compared with the case where data is decompressed and then compressed and recorded by an external device, and a desired program can be recorded by a simple operation.
[0042]
Thus, at the time of reproduction, the video data and audio data recorded in this way are reproduced from the optical disc and input to the demultiplexer 15 via the bus BUS. Further, these video data and audio data are output to an external device via the demultiplexer 15, decoders 16, 17, etc., so that a desired program can be auditioned by, for example, time shifting.
[0043]
When recording in this way, in the receiving device 10, program information is acquired by EPG which is information that can be acquired, and this program information is recorded together with the recording start time and the like. As a result, the user can select a desired program from a large number of programs with reference to the program information and the like at a later time when listening to the recorded program, and the usability is improved accordingly.
[0044]
Similarly, when recording, for example, when the next week's program guide, commentary on the movie, etc. is finished and the original movie broadcast is started based on the time information set in the PMT by the user's setting, Furthermore, when the disc jockey conversation ends in the music program and the music broadcast is started, recording on the optical disc is started under the control of the central processing unit 13. Further, when the movie, music, or the like ends according to the PMT time information, the recording of the program ends.
[0045]
As a result, it is possible to create an optical disc equivalent to, for example, a compact disc or DVD, excluding movie commentary, disc jockey conversations, etc., and so-called electronic distribution of these media becomes possible.
[0046]
When such time information or the like is assigned to the PMT, the processing in the conventional receiving apparatus becomes a problem, but in a receiving apparatus in this type of digital satellite broadcasting system, data that is difficult to interpret is assigned to the PMT or the like. If you are, you are supposed to ignore this. Therefore, even when control data for recording start and recording end is transmitted by the PMT in this way, compatibility with conventional devices can be maintained and user convenience can be improved.
[0047]
Further, in the receiving apparatus 10, since the recording medium is a removable medium, it can be removed from the receiving apparatus 10 and can be auditioned by other devices as necessary.
[0048]
On the other hand, in data broadcasting, the elementary stream is separated by the demultiplexer 15 and input to the floppy disk drive unit 22 via the bus BUS, where it is recorded on the floppy disk. As a result, the floppy disk can be set in a personal computer or the like to check, for example, a recipe for cooking, and a game distributed by a digital satellite broadcasting system can be enjoyed.
[0049]
(3) Effects of the embodiment
According to the above configuration, the recording / playback unit 20 is integrated to record the data that has been compressed and broadcast without decompressing the data, thereby effectively utilizing the characteristics of the program broadcast on multiple channels. The desired program can be recorded with a simple configuration as a whole.
[0052]
In addition, by controlling the recording to the recording medium based on the control data added to the transport stream that is a multiplexed stream, it is possible to record only the desired content except unnecessary conversations, As a result, for example, an optical disk equivalent to a compact disk or DVD can be created and these media can be electronically distributed.
[0053]
Further, since this control data is assigned to the PMT which is a control packet, this type of service can be developed while maintaining compatibility with the conventional receiving terminal.
[0054]
(4) Other embodiments
In the above-described embodiment, the case where the program information is acquired from the EPG and recorded together with the program has been described. However, the present invention is not limited to this, and the program information may be acquired via the Internet, for example.
[0055]
In the above-described embodiment, the case where the recording / reproducing unit is configured by an optical disk has been described. However, the present invention is not limited thereto, and may be configured by an IC card, a hard disk device, or the like.
[0056]
Further, in the above-described embodiment, the case where the present invention is applied to a receiving device of a digital satellite broadcasting system has been described. Also good.
【The invention's effect】
As described above, according to the present invention, a recording device is integrated with a multi-channel broadcast receiving device, and data that has been compressed and recorded is recorded without data expansion, so that a program that is broadcast on multi-channel broadcasting. The desired program can be recorded with a simple configuration as a whole by effectively utilizing the features of the above.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a receiving device of a digital satellite broadcasting system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a partial configuration of a base station of the digital satellite broadcasting system.
FIG. 3 is a time chart for explaining data compression processing of video data.
FIG. 4 is a time chart for explaining generation of elementary streams.
FIG. 5 is a time chart for explaining transport stream packet generation.
FIG. 6 is a time chart for explaining a transport stream.
FIG. 7 is a schematic diagram for explaining PSI.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ground station, 10 ... Receiving device, 14, 16, 17 ... Decoder, 13 ... Central processing unit, 15 ... Demultiplexer, 20 ... Recording / reproducing part, 22 ... Floppy disk drive part

Claims (5)

In a receiving apparatus for receiving broadcast waves in which data-compressed video data and / or audio data are time-division multiplexed,
Demodulation means for demodulating a multiplexed stream formed by time-division multiplexing the video data and / or audio data from the broadcast wave;
Selection means for selecting video data and / or audio data that is compressed from the multiplexed stream ;
In a state in which the data compression, so before SL formed by the data compression is outputted from the selection means video data and or audio data is recorded on the recording medium, control data to a recording transmitted by the multiplexed stream And a control means for controlling recording on the recording medium based on the above . The selection means includes
Selecting the video data and / or audio data based on the PMT information included in the PSI information transmitted by the multiplexed stream;
The receiving apparatus according to claim 1, wherein the control data is data included in the PMT information . In a receiving method for receiving a broadcast wave in which data-compressed video data and / or audio data are time-division multiplexed,
A demodulation step of demodulating a multiplexed stream in which the video data and / or audio data are time-division multiplexed from the broadcast wave;
A selection step of selecting video data and / or audio data that is compressed from the multiplexed stream;
Data for control related to recording transmitted by the multiplexed stream so that the video data and / or audio data selected by the selection step are recorded on the recording medium while the data is compressed. And a control step for controlling recording on the recording medium based on
And a receiving method. In a receiving apparatus for receiving video data and / or audio data of a plurality of programs that are data-compressed and multiplexed,
Receiving means for receiving video data and / or audio data of the plurality of programs;
Received by the receiving means based on PMT information specifying the video data and / or audio data of the program selected by the user included in the PSI information transmitted together with the video data and / or audio data of the plurality of programs Selecting means for selecting video data and / or audio data of the selected program from the video data and / or audio data of the plurality of programs;
Recording of video data and / or audio data of the selected program included in the PMT information so that the video data and / or audio data selected by the selection means are recorded on a recording medium while being compressed. Control means for controlling recording on the recording medium based on control data;
A receiving apparatus comprising: In a receiving method for receiving video data and / or audio data of a plurality of programs compressed and multiplexed,
Receiving the video data and / or audio data of the plurality of programs;
PSI information transmitted together with video data and / or audio data of the plurality of programs Based on the included PMT information identifying the video data and / or audio data of the program selected by the user, the selected from the video data and / or audio data of the plurality of programs received in the receiving step A selection step of selecting video and / or audio data of the program;
Recording of video data and / or audio data of the selected program included in the PMT information so that the video data and / or audio data selected in the selection step are recorded on a recording medium while being compressed. A control step for controlling recording on the recording medium based on the control data;
A receiving method comprising:

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