JP2006060655A - Recording and reproduction method of stream information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording and reproduction method which obtains a smooth reproduction image even for high speed forwarding and rewinding when a plurality of receiving programs are recorded together, and a program of them is selected and reproduced. <P>SOLUTION: When a plurality of receiving streams are recorded in a recording medium 22 by a recording and reproduction means 21, stream information acquisition parts 13a, 13b acquire individual information tables regarding the plurality of streams, a stream information creator 14 creates a composite information table, a stream multiplexer 16 arranges and records the composite information table and the plurality of stream information in time series. A bitstream recording and reproduction device is realized, which performs reproduction of the special stream out of them by detecting and acquiring identification information regarding the special stream of the composite information table recorded in the recording medium 22 using a stream selector 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multiplexed stream information recording / reproducing method in which a plurality of bit streams are simultaneously recorded on a randomly accessible digital recording medium, and one of them is selected and reproduced.

Recently, digital broadcasts that are encoded and broadcast by a compression encoding method such as MPEG (moving picture experts group) -2, including BS (broadcasting satellite) broadcasts, CS (Communication Satellite) broadcasts, and digital terrestrial broadcasting Many things such as wave broadcasting have been made.
On the other hand, in addition to using video tapes such as analog VTRs and digital VTRs as recording media, apparatuses for recording broadcast programs have also been introduced into the market as program recording apparatuses that record on random accessible recording media such as hard disks and DVDs. In the case of a device that records on a randomly accessible recording medium, a function that is convenient for the user can record a plurality of programs on the same recording medium, and immediately search for and play the desired program from among them. have.

  Patent Document 1 discloses a recording apparatus that simultaneously records a plurality of programs that are broadcast and received simultaneously on a randomly accessible recording medium in a plurality of file formats. A program title is assigned to each program to be recorded, and a plurality of recorded programs can be identified by giving a special file name. When recording a program record while cutting a commercial message (CM), the program file becomes discontinuous each time it is cut. By associating the file name, the discontinuous program at the time of the CM cut is continued. It is possible to play.

In packetized digital data broadcast by a transport stream defined by MPEG-2, stream data management information is attached to each packet. Based on the stream data management information, a program can be associated with a file name related to the program.
In Patent Document 2, stream data including video or audio is divided by a predetermined data amount unit. The management information of the stream data is divided into stream data management information that is commonly used for managing each divided stream data, and local management information that is used for managing each divided stream data. An information recording / reproducing apparatus that records stream data management information and an access unit obtained by adding local management information to divided stream data on a randomly accessible recording medium and performs a reproduction operation based on the recorded management information is disclosed. Has been.

On the other hand, recent high-density recording media have greatly increased the recording bit rate and recording capacity. In addition to recording HDTV (High Definition TV) signals, simultaneous recording of SDTV (standard definition television) signals of a plurality of channels has become possible. For example, it is possible to simultaneously record video signals received at the same time using the data management methods of Patent Document 1 and Patent Document 2. It is possible to simultaneously record a so-called front program and back program that are broadcast during the golden hour, and view them with a time shift.
JP 2001-197413 A Japanese Patent Laid-Open No. 2003-228921

However, when a plurality of programs are recorded simultaneously on a recording medium with different file names for each program, and only one designated program among the plurality of recorded programs is to be played back by fast-forwarding, it is smooth. Cannot get the playback video. That is, in the case of recording with a file name assigned to each program, the file management information increases when the file size, which is the data size to be continuously recorded for one program among a plurality of programs, is reduced. In order to file a bit stream compression-encoded in MPEG-2 or the like, it is possible to reproduce from the beginning of an intra frame (I picture) so that a video can be obtained by reproducing from the beginning of the file. Divide and record the video signal. Accordingly, it is necessary to increase the file size for recording.
When high-speed playback is performed by specifying one of the programs that are recorded alternately with a large file size, the time relationship of the video is particularly irregular during high-speed playback because of the access time and seek time of the target file. Become. In viewing by time shift, it is important to obtain a smooth fast-forward and fast-reverse video of a recorded program.

  Therefore, the present invention has been made to solve the above problems, and simultaneously records a plurality of received programs and selects and reproduces one of the recorded programs. It is an object of the present invention to provide a stream information recording / reproducing method capable of reproducing high-speed fast-forward and fast-reverse with a smooth motion video signal.

  The present invention records the stream information of the first and second systems transmitted to a recording medium, and reproduces the information related to the stream information of the first and second systems recorded on the recording medium. In the recording / reproducing method, the transmitted first and second stream information includes at least identification information for identifying the first and second stream information, audio information, and image information. An audio information unit that generates the identification information part in which the identification numbers relating to each of the first and second stream information are grouped together, and the first and second audio image information are grouped together after the identification information part. The stream information recording / reproducing method is characterized in that the identification information portion and the audio image information portion that are grouped together are recorded on the recording medium.

  According to the present invention, the stream for recording the transmitted first and second stream information on the recording medium and reproducing the information on the first and second stream information recorded on the recording medium. In the information recording / reproducing method, the transmitted first and second stream information includes at least identification information for identifying the first and second stream information, audio information, and image information. The identification information part in which the identification numbers relating to each of the first and second stream information are grouped together is generated, and the first and second audio image information is grouped together following the identification information part. Since it has a special procedure for generating an information part and recording the identification information part and the audio image information part which are grouped together on the recording medium, a plurality of received programs can be shared. And a stream information recording / reproducing method capable of reproducing particularly fast fast-forward and fast-reverse with a smooth motion video signal when selecting and reproducing one of a plurality of recorded programs Can be provided.

A stream information recording / reproducing method according to each embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram showing a configuration example of a bitstream recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing a description example of stream group configuration information according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of a time relationship related to the operation of the stream information according to the embodiment of the present invention.
FIG. 4 is a diagram showing a description example of composite stream group configuration information according to the embodiment of the present invention.
FIG. 5 is a diagram showing replacement recording of stream group configuration information according to the embodiment of the present invention.

  The bit stream recording / playback apparatus according to the embodiment generates combined stream group configuration information based on each of stream group configuration information related to a plurality of programs to be recorded simultaneously, and generates the generated combined stream group configuration information. It is attached to the bit stream of the program and recorded. Reproduction of one of a plurality of recorded programs is performed by acquiring a bit stream related to the target program from all the bit streams recorded at the same time based on the composite stream group configuration information and reproducing the target bit. This realizes a bitstream recording / reproducing apparatus that does not require an access operation and a seek operation for acquiring a stream and enables high-speed fast-forward and fast-reverse reproduction of a selected program.

The configuration of the bit stream recording / reproducing apparatus will be described.
The bit stream recording / reproducing apparatus shown in FIG. 1 includes a BS (broadcasting satellite) tuner 11a, a terrestrial digital tuner 11b, stream buffers 12a and 12b, stream information acquisition units 13a and 13b, a stream information generation unit 14, and a stream information replacement unit 15a. 15b, a stream multiplexing unit 16, a recording / playback unit 21, a recording medium 22, a drive unit 23, a stream selection unit 31, a decoding unit 32, and an operation unit 41. A satellite antenna is connected to the BS tuner 11a, and a UHF (ultra high frequency) antenna is connected to the terrestrial digital tuner 11b. The decoding unit 32 outputs a video signal and an audio signal obtained by decoding the stream. The bit stream recording / reproducing apparatus is operated via the operation unit 41.

The operation of the bitstream recording / reproducing apparatus will be described.
First, the operation unit 41 is operated to make a recording reservation for a program received simultaneously by the BS tuner 11a and the terrestrial digital tuner 11b. A bit stream in the MPEG-2TS (Transport Stream) signal format obtained when the reserved time arrives and is received by the BS tuner 11a is input to the stream buffer 12a, temporarily stored therein, and a terrestrial digital tuner. The bit stream obtained by receiving at 11b is input to the stream buffer 12b and temporarily stored therein. The stream information acquisition unit 13a acquires PAT (Program Association Table) information related to a broadcast program received from the bit stream stored in the stream buffer 12a. The stream information acquisition unit 13b acquires PAT information from the stream buffer 12b. The PAT information acquired by the stream information acquisition unit 13a and the stream information acquisition unit 13b is input to the stream information generation unit 14. There, PAT information of both the satellite broadcast program and the terrestrial digital broadcast program received at the same time is synthesized to generate synthesized PAT information.

  The stream information replacing unit 15a replaces the PAT information attached to the satellite broadcast program with the synthesized PAT information, and the stream information replacing unit 15b replaces the PAT information attached to the terrestrial digital broadcast program with the synthesized PAT information. The replacement bit stream of the satellite broadcast program and the replacement bit stream of the terrestrial digital broadcast program in which the respective PAT information is replaced are input to the stream multiplexing unit 16. There, the two permutation bit streams are multiplexed (MUX). The two replacement bit streams multiplexed are subjected to predetermined signal processing by the recording / reproducing unit 21 and recorded on the recording medium 22 that is rotationally driven by the driving unit 23.

  The user operates the operation unit 41 to select one of the recorded satellite broadcast program or terrestrial digital broadcast program and perform a reproduction operation. Two replacement bit streams recorded from the recording medium 22 rotated at high speed by the driving unit 23 are reproduced via the recording / reproducing unit 21. The signal obtained by reproduction acquires a replacement bit stream related to the program selected by the stream selection unit 31. In the decoding unit 32, the acquired bit stream is decoded, and the video signal and audio signal obtained by decoding are input to a display (not shown) and displayed and sounded there.

  When the fast-forward playback operation is performed by the user, only the bit stream recorded with the intra frame related to the selected program among the two replacement bit streams played back from the recording medium 22 rotated at high speed is acquired. To do. The decoding unit 32 generates and outputs a high-speed playback video. Here, each of the two replacement bit streams recorded on the recording medium 22 is recorded as a bit stream packetized with a predetermined data size without using a file structure in which an area is set for each program and recorded. Therefore, for example, an operation of acquiring only a bit stream in which an intra frame is recorded can be reproduced without randomly accessing or seeking the recording area of the recording medium 22. Therefore, no free time is generated in the bit stream obtained during high-speed playback. High-speed playback video with smooth operation can be obtained.

Next, this will be described in detail.
The stream group configuration information shown in FIG. 2 shows the configuration of a bit stream obtained by receiving satellite broadcasting in (a), and the configuration of a bit stream obtained by receiving terrestrial digital broadcasting in (b). . That is, the stream group configuration information (channel 1) A1 in (a) is information relating to the video signal having the stream ID (Identification) a1, the audio signal having the stream ID a2, and the synchronous reproduction of the video and audio signal. It consists of an ac with a certain clock ID. (B) Stream group configuration information (channel 2) B1 is a video signal whose stream ID (Identification) is b1, an audio signal whose stream ID is b2, and a clock which is information related to synchronous reproduction of the video and audio signals. It consists of ID bc.

FIG. 3 shows an example of the time relationship when a bit stream obtained by receiving satellite broadcast and terrestrial digital broadcast is recorded.
From the broadcast MPEG-2 transport stream, a video and audio stream and clock information are received following the PAT (Program Association Table). Satellite broadcast recording starts from time t1. The A1 PAT received up to time t2 is input to the stream buffer 12a. Thereafter, the received clock information ac [0], stream a1 [1],..., Stream a2 [5] are temporarily stored in the stream buffer 12a in this order.
Recording of terrestrial digital broadcasting is started from time t3. The B1 PAT received by time t4 is input to the stream buffer 12b. The received clock information bc [50], stream b1 [51], stream b2 [52],... Are sequentially temporarily stored in the stream buffer 12b.

  At time t4, it is determined that two bit streams are recorded on the recording medium 22. Therefore, the stream information generation unit 14 combines the stream configuration information (PATA1) and the stream configuration information (PATB1) obtained from the stream information acquisition units 13a and 13b to generate combined stream configuration information. When there is stream group configuration information (PAT) temporarily stored in the stream buffer 12a, the stream configuration information is replaced with the combined stream configuration information when input to the stream multiplexing unit 16 via the stream information replacement unit 15a. The The stream group configuration information temporarily stored in the stream buffer 12b is similarly replaced. The two bit streams multiplexed by the stream multiplexing unit 16 are recorded as one multiplexed stream on the recording medium 22 without being formed as a file for each program.

When the recording of the satellite broadcast ends at time t7, the recording of the stream configuration information (PATA1) and the subsequent stream a1 [10] is not performed. The generation of the composite stream configuration information in the stream information generation unit 14 is generated as composite stream configuration information related to one recorded program.
When satellite broadcast recording is resumed again at time t10, generation and replacement of the above-described composite stream configuration information is resumed.

The combined stream configuration information (a) to (d) shown in FIG. 4 indicates the structure of the combined stream configuration information at each time. (A) is the combined stream configuration information D0 generated at time t2, in which the program ID is 1, the video stream ID is a1, the audio stream ID is a2, and the synchronization information ID is ac.
(B) is the composite stream configuration information D1 generated at time t4. The information includes a stream of program ID1 in which the ID of the video stream is a1, the ID of the audio stream is a2, and the ID of the synchronization information is ac, the ID of the video stream is b1, the ID of the audio stream is b2, and the synchronization information Is a stream of program ID 2 with ID of bc.
(C) is the combined stream configuration information D2 generated at time t8, and does not describe the information of the program ID1 that has been recorded as compared with the combined stream configuration information D1.
In the stream composition information D3 in (d), at time t11, a stream with a program ID 3 in which the ID of the video stream with the program ID 3 is a1, the ID of the audio stream is a2, and the synchronization information ID is ac is added. Information.

FIG. 5 shows the arrangement of packets recorded on the recording medium 22. (A) shows the state of a packet recorded between time t2 at which satellite broadcast recording is started and before time t4 at which digital terrestrial broadcast recording is started. The stream group configuration information A is replaced with the combined stream configuration information D0, and the received synchronization clock information ac, video stream a1, and audio stream a2 are recorded continuously.
(B) replaces the stream group information A1 and B1 of both the program ID2 program newly recorded after time t4 and the program ID1 program that has been recorded with the common combined stream configuration information D1. This is the state of the packet to be recorded. Clock information, a video stream, and an audio stream are recorded by multiplexing received signals.
(C) shows the state of the packet recorded by replacing the stream group configuration information B1 with the combined stream configuration information with the program ID of 2.

  The reproduction operation obtains and reproduces the program ID to be reproduced, the video and audio stream information, and the synchronization information based on the identification code based on the obtained composite stream configuration information. Further, when a plurality of program IDs are described in the composite stream configuration information, it is possible to reproduce while performing so-called channel hopping while switching between the plurality of programs. The user can select and replay a favorite program based on a plurality of program information displayed on a display (not shown) as required.

In the embodiment, the operation of simultaneously recording both the received satellite broadcast and digital terrestrial broadcast and reproducing one of them is described. When a plurality of tuners for receiving satellite broadcasts and digital terrestrial broadcasts are provided, for example, a plurality of satellite broadcast programs can be recorded simultaneously and one of them can be reproduced.
Even when a plurality of programs are broadcast simultaneously on one broadcast channel, a plurality of programs can be recorded in the same manner, and a desired program can be selected and reproduced.

Even if the program received at the same time is SDTV (standard definition television) or HDTV (High Definition Television), and even when recording as a high-compression low bit-rate SDTV and low-compression high-lay HDTV signal. These can be recorded at the same time, and only one of them can be selected to obtain normal playback and smooth high-speed playback video.
It is also possible to receive an analog broadcast, generate it as a compressed encoding and transport stream signal, and record it together with the digital broadcast that is received simultaneously. In that case, instead of acquiring the stream information, stream group configuration information is created, and then composite stream configuration information is generated. It is necessary to create stream group configuration information using non-overlapping stream IDs.

  According to the bit stream recording / reproducing apparatus shown in the present embodiment, a plurality of pieces of stream information to be transmitted are recorded on the recording medium 22, and specific information is selected from the plurality of pieces of stream information recorded on the recording medium 22. In the recording / reproducing method of stream information for reproducing stream information, recording by the recording / reproducing unit 21 on the recording medium 22 is performed by each stream information acquiring unit 13a, 13b from each of the plurality of stream information. , The plurality of individual information tables are synthesized by the stream information generation unit 14 to create a synthesis information table, and the synthesis information table and the plurality of stream information are further time-sequentially by the stream multiplexing unit 16. A plurality of stream information is recorded so as to be rearranged, and the specific stream is recorded. The stream information is reproduced by detecting the identification information of the specific stream information described in the composite information table recorded in time series on the recording medium 22 by the stream selection unit 31. Therefore, each stream information is not based on a different file structure, and a plurality of received programs are simultaneously recorded and accessed when one of the recorded programs is selected and played back. Since no operation or seek operation is performed, fast-forward and fast-reverse images can be reproduced with a smooth motion video signal.

  The present invention can be applied to a recording / reproducing apparatus that records a plurality of received broadcast programs at the same time, and selects and reproduces one program among them.

It is a block diagram which shows the structural example of the bit stream recording / reproducing apparatus which concerns on implementation of this invention. It is a figure which shows the example of description of the stream group structure information which concerns on implementation of this invention. It is a figure which shows the example of the time relationship which concerns on the operation | movement of the stream information which concerns on implementation of this invention. It is a figure which shows the example of a description of the synthetic | combination stream group structure information which concerns on implementation of this invention. It is a figure which shows the replacement recording of the stream group structure information which concerns on implementation of this invention.

Explanation of symbols

11a BS tuner 11b Digital terrestrial tuner 12a, 12b Stream buffer 13a, 13b Stream information acquisition unit 14 Stream information generation unit 15a, 15b Stream information replacement unit 16 Stream multiplexing unit 21 Recording / playback unit 22 Recording medium 23 Drive unit 31 Stream selection unit 32 Decoding unit 41 Operation unit

Claims (1)

In a stream information recording / reproducing method for recording first and second stream information transmitted on a recording medium and reproducing information on the first and second stream information recorded on the recording medium. ,
The transmitted first and second stream information includes at least identification information for identifying the first and second stream information, audio information, and image information.
The identification information part in which the identification numbers relating to each of the first and second stream information are grouped together is generated, and the first and second audio image information is grouped together following the identification information part. A stream information recording / reproducing method, comprising: generating an information part and recording the identification information part and the audio image information part which are grouped together on the recording medium.

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