JP3895259B2 - Playback device, recording method, and playback method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reproducing apparatus such as an optical disc, a recording method, and a reproducing method.
[0002]
[Prior art]
In recent years, disk playback apparatuses that play back optical disks that record audio and video have become widespread, and are widely used as playback apparatuses such as movie software and karaoke. Recently, an apparatus for reproducing an optical disk in which audio and video data are digitally recorded has appeared, and is commercially available, for example, as a karaoke system. Since this optical disc is the same size as a CD (compact disc), it has an advantage that the entire apparatus can be miniaturized.
[0003]
FIG. 9 shows the recording format of such an optical disc. As shown in the figure, this recording format includes a lead-in area 1, an information area 2, a data area 3, and a lead-out area 4. The information area 2 corresponds to the track (program) 1. A data area 3 for recording compressed video and compressed audio data corresponds to a track (program) 2 up to 99. As shown in FIG. 10, each track (program) in the data area 3 is composed of an array of video data V and audio data A physically divided in units of sectors so that the video and audio can be synchronized. In addition, one audio sector A is regularly arranged after six consecutive video sectors V.
[0004]
In the information area 2, a management table showing the reproduction procedure of the program in the data area 3 is recorded. For example, in the case of a movie or the like, since one movie is composed of a plurality of programs having continuity, a management table indicating the reproduction procedure between such programs is indispensable. When starting the disk playback, the disk playback apparatus reads the management table into the memory in advance, and continuously plays back each program according to the procedure indicated by the management table. Therefore, a large capacity memory capable of storing all the contents of the management table is required for the disk reproducing apparatus.
[0005]
In addition, the international standard MPEG (Moving Picture Image Coding Expert Group) 1 system is adopted for compression encoding of audio data and video data. This is a method for variable-length compression of data. Here, in order to improve the random accessibility, it is theoretically managed to manage in which position (bit) of which sector a GOP (Group Of Picture), which is an MPEG video encoding unit, is located on the management table. Is possible. However, when such a management table is constructed, processing on the system side becomes complicated, and more memory capacity is required. For this reason, it is practically limited to managing this in units of programs.
[0006]
[Problems to be solved by the invention]
Thus, conventionally, it has been necessary to provide the playback apparatus with a large memory for storing the contents of the management table recorded on the recording medium. Further, the management of data on the management table is limited to being performed in units of programs, and there is a difficulty in lacking random accessibility.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a playback device, a recording method, and a playback method for a recording medium that can exclude a memory for storing a management table from the playback device.
[0008]
It is another object of the present invention to provide a recording medium reproducing apparatus, recording method, and reproducing method that are capable of starting reproduction from an arbitrary unit in the middle of a program and exhibiting random accessibility.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the playback device of the present invention records a program composed of data including video data and audio data in units of at least one data unit composed of a plurality of sectors, Among the programs, the first data unit constituting the first program includes address information indicating the head sector of the second data unit following the first data unit and the head of the second program following the first program. A reproducing apparatus for reproducing data from a recording medium recorded so as to include a data unit header having sector link data including address information indicating a sector, wherein each sector constituting the data unit includes a main video and a sub-picture. Any identification information indicating the data type of the own sector is further recorded among the video, audio and management information. Reading means for reading data from the recording medium, and control for controlling the data reproduction operation based on either the address information indicating the head sector of the second data unit or the address information indicating the head sector of the second program Means .
[0010]
Here, the address information of the related unit or program is, for example, the address information of the head sector of the next program, the address information of the head sector of the unit to which the sector belongs, and the address information of the head sector of the previous unit. .
[0011]
Also, for each sector, the address information of the head sector of the next unit, the address information of the head sector of the current program, the address information of the head sector of the previous program, the type in the logical format of the data of its own sector The information shown and the address information of the first sector in the management area may be further recorded.
[0012]
Furthermore, in order to achieve the above object, the recording method of the present invention is a recording medium in which a program composed of data including video data and audio data is recorded in units of at least one data unit composed of a plurality of sectors. In the recording method, the first data unit constituting the first program among the programs includes address information indicating the first sector of the second data unit following the first data unit and the first data unit. Recording is performed so as to include a data unit header having sector link data including address information indicating the first sector of the second program following the program, and in each sector constituting the data unit, main video, sub-video, audio and management information it characterized in that further to record any of the identification information indicating the data type of the local sector of the That.
[0013]
In order to achieve the above object, the playback method of the present invention records a program composed of data including video data and audio data in units of at least one data unit composed of a plurality of sectors. The first data unit constituting the first program among the programs includes address information indicating the head sector of the second data unit following the first data unit and the second program following the first program. A reproduction method for reproducing data from a recording medium recorded so as to include a data unit header having sector link data including address information indicating a head sector, wherein each sector constituting the data unit includes a main video, Of the sub-picture, audio and management information, any identification information indicating the data type of the own sector is further recorded. And which is characterized in that the access to the sector using any of the address information indicating the leading sector of the address information or the second program indicating the leading sector of the second data units.
[0014]
That is, since at least the address information of the first sector of the next program is recorded in each sector in the recording medium of the present invention, for example, by reading this address information at the time of reproduction, the information in the management table is obtained. A plurality of programs can be continuously played back by knowing the playback procedure between programs without using them. Therefore, the memory for the management table can be excluded from the playback device.
[0015]
In addition, in the recording medium of the present invention, in addition to the address information of the first sector of the next program, at least the address information of the first sector of the next unit is recorded in each sector. Playback can be started from the unit. That is, for example, when a request for switching to program playback after T time is received during playback, the head sector of the program after T time is obtained and then this head sector is searched through a track jump. When retrieved, the address information of the head sector of the next unit recorded in this sector is read, and reproduction is performed from the head sector of the corresponding next unit based on this address information.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 is a diagram showing a relationship between a physical format and a logical format on an optical disc as a recording medium according to an embodiment of the present invention.
[0018]
In the figure, 100 is a data stream recorded on an optical disc. The data stream 100 includes an array of variable length data units (hereinafter referred to as DUT) 101. The DUT 101 is composed of a DUT header 102, sub-video data 103, audio data 104, and main video data 105 in a logical format. The sub video data 103, the audio data 104, and the main video data 105 are variable length compressed data, and these signal lengths are determined based on a predetermined reproduction time. Each data in the DUT 101 is composed of a plurality of sectors 106 in the physical format.
[0019]
FIG. 2 is a diagram showing the configuration of the sector 106. The sector 106 is composed of a header 201 and actual data 202. The header 201 includes a synchronization header 203 in which a sector 106 number and a synchronization signal for generating synchronization at the time of data reproduction are recorded, and sector link data (hereinafter referred to as SLD) 204. The SLD 204 includes a management area head sector number 205, an identification flag 206, a BOOK number 207, a story number 208, a program number, a DUT number 209, a DUT identification 210, a next program head sector number 211, and a current program head sector number 212. Each area includes the first sector number 213 of the previous program, the first sector number 214 of the next DUT, the first sector number 215 of the current DUT, and the first sector number 216 of the previous DUT.
[0020]
Here, the story number 208 and the program number 209 will be described. A story refers to a group of video and audio data that are related in a logical format. Specifically, a movie or the like corresponds to this. One or more stories exist on a single disc. The story consists of multiple programs. Here, a part of video and audio can be shared by a plurality of stories.
[0021]
For example, it is assumed that two stories A and B are recorded, and one story A includes a violent scene that seems to be problematic for adolescents. In this case, the video / audio (program) is the same as that of the story A except for the violent scene, but the violent scene in question can be recorded as the other story B, which is replaced with another video / audio (program). .
[0022]
FIG. 3 is a diagram showing an example of a story management table recorded in the management area on the optical disc. As shown in the figure, the number of programs for each story and its number sequence are registered in this table. Here, the programs 3 and 4 of the story A correspond to the violent scene, and in the story B, this is replaced with the programs 7 and 8 of the scene having no problem. In this case, the programs 0, 1, 2, 5, and 6 are shared by the stories A and B to efficiently use the disk capacity.
[0023]
FIG. 4 is a diagram showing an example of a program management table recorded in the management area on the optical disc. As shown in the figure, the start sector number and the end sector number of each program 0 to N are registered in this table.
[0024]
Next, an optical disk reproducing apparatus having such a recording format will be described. FIG. 5 is a block diagram showing the overall hardware configuration of the optical disk reproducing apparatus.
[0025]
In the figure, reference numeral 501 denotes an optical disk, and 502 denotes a pickup that irradiates the optical disk 501 with laser light and reads the intensity of the reflected light as a reproduction signal. The reproduction signal obtained by the pickup 502 is input to the waveform equalization / PLL circuit 503, where waveform equalization, data slicing, and the like are performed and sent as a data stream to the synchronous reproduction circuit 504. The synchronous reproduction circuit 504 detects the synchronous header 203 of the sector shown in FIG. 2 from the data stream, and supplies data to be reproduced to the error correction (ECC) circuit 505. If there is an error in the data, the error is corrected, and the correction result is passed to the video separation circuit 506. The video separation circuit 506 separates the video data and the audio data from the data, and stores them separately in each independent storage area of the cache memory 507. The video data and audio data stored in the cache memory 507 are read in accordance with requests from the video reproduction circuit 508 and audio reproduction circuit 509, respectively, and necessary signal processing is performed in the video reproduction circuit 508 and audio reproduction circuit 509. Then, it is reproduced by the TV monitor 510 and the speaker 511.
[0026]
FIG. 6 is a flowchart showing a processing procedure for reproducing a story. In this case, a story is first selected and set on the control panel 512 (step 601). Next, the number of programs constituting the story to be reproduced is read from the story management table shown in FIG. 3 and stored in the register 513 (step 602). Subsequently, the start sector number of the first program of the story to be reproduced is read from the program management table shown in FIG. 4 and stored in the register 514. Thereafter, the start sector number PS of the first program stored in the register 514 is set in the sector determination circuit 515 (step 603).
[0027]
The track jump signal generation circuit 516 calculates the number of tracks TN to jump based on the start sector number PS set in the sector determination circuit 515 (step 604), and jumps about TN tracks to the servo control circuit 517. Supply a jump signal. As a result, the pickup 502 jumps to the vicinity of the target track (step 605).
[0028]
When the pickup 502 reaches the vicinity of the target track, the synchronous reproduction circuit 504 reproduces the sector number SX in the synchronous header 203 shown in FIG. 2, and stores the reproduced sector number SX in the register 518 (step 606). .
[0029]
Here, the sector determination circuit 515 determines whether or not the sector number SX stored in the register 518 satisfies the following condition (step 607). PS−N <SX ≦ PS (where N is the number of sectors for one track, for example) Here, if the reproduction sector number SX does not satisfy the above condition, the number of tracks to be further jumped is calculated and the track jump is performed again. .
[0030]
If the reproduction sector number SX satisfies the above conditions, the sector number SX continues to be reproduced (step 609). After that, if the reproduction sector number SX matches the start sector number PS of the program (step 608), the video The audio data is reproduced (step 611). When the program end DUT is exceeded (step 610), video and audio playback is stopped and the flow returns to the start flow of the next program. Since the time to move from the current program to the next program is very short, the reproduced video / audio on the TV is not apparent.
[0031]
The program end can be determined by detecting the story number 208, program number, and DUT number 209 of the SLD 204 shown in FIG. Further, since the start sector number of the next program can be known from the next program start sector number 211 in the SLD 204, this number 211 is stored in the register 514, and this number 211 is further read into the sector determination circuit 515 to continue the processing. . Since the number of programs is recorded in the register 513, when the number of reproduction programs reaches this and reproduction of video and audio is completed (step 612), all reproduction ends.
[0032]
As another embodiment of the optical disk reproducing apparatus, if the program termination code (for example, all “1”) is inserted in the next program head sector number 211 of the SLD 204 of the sector in the final program, the number of programs in the story is recorded. The area becomes unnecessary on the disk, and a circuit for registering this information in hardware is also unnecessary.
[0033]
As described above, according to the present embodiment, the SLD 204 having the configuration shown in FIG. 2 is recorded in each sector, so that it is not necessary to provide the optical disk reproducing apparatus with a large-capacity memory for storing the management table.
[0034]
Further, according to the present embodiment, when it is desired to reproduce the time Ts seconds later during reproduction, it can be easily accessed. The operation in this case will be described below.
[0035]
First, a playback request after Ts seconds is set on the control panel 512. Then, the DUT number calculation circuit 519 first calculates the program number and the DUT number after Ts seconds as follows. FIG. 7 shows a management table in which the reproduction times of the programs 0 to N are registered. As described above, since the reproduction times of the programs 0 to N are registered in this table, it is possible to calculate which program is present after Ts seconds by referring to this. The management table shown in FIG. 7 may indicate the playback time by the number of DUTs.
[0036]
For example, the case where the story A is played after Ts = 1000 seconds will be described. Here, it is assumed that the current program number is 0, the DUT number is 20, and the specific contents of the management table of FIG. 7 are as follows.
[0037]
Program 0 playback time = 200 seconds Program 1 playback time = 300 seconds Program 2 playback time = 100 seconds Program 3 playback time = 400 seconds Program 4 playback time = 300 seconds When the current DUT reaches the end of program 0 If the playback time of the DUT is 0.5 seconds,
T0 = 200−0.5 × 20 = 190 seconds. Therefore,
T0 + T1 + T2 + T3 = 990 seconds, and after Ts = 1000 seconds, it is sufficient to play back 10 seconds after the start of the program 4. That is, 10 / 0.5 = 20 in terms of DUT
Thus, the program 4 may be reproduced from the DUT number 21 of the program 4.
[0038]
If the target program number and DUT number can be calculated in this way, the start sector number of the program 4 is read from the program management table of FIG. 4 and set in the sector determination circuit 515 through the register 514.
[0039]
The track jump signal generation circuit 516 calculates a track TN to jump from the start sector number SD set in the sector determination circuit 515, and supplies a jump signal to the servo control circuit 517 so as to jump about TN tracks. As a result, the pickup 502 jumps to the vicinity of the target track. Thereafter, the sector is reproduced at the jump destination, and when the reproduced sector number matches the start sector SD number in the sector determination circuit 515, the next DUT head sector number 214 of the SLD 204 is detected, and the sector number 214 is again stored in the register 514. Store and repeat jump action. Then, the target 21st DUT head sector is detected to reproduce video and audio data. Thus, the reproduction after Ts seconds is performed. If this Ts is shortened, double speed reproduction or quadruple speed reproduction becomes possible.
[0040]
In this embodiment, the following sector search can be performed using other information in the SLD 204.
[0041]
For example, it is possible to search from the current program head sector number 212 for the head sector of the program that has been played so far, and play back again from the head of the same program. Similarly, the head sector of the program immediately before the program that has been reproduced can be searched from the head sector number 213 of the previous program. Further, the first sector of the DUT including the sector that has been reproduced up to now is searched from the first sector number 215 of the current DUT, or the DUT that includes the sector that has been reproduced up to now from the first sector number 214 of the previous DUT. It is also possible to search the first sector of the previous DUT.
[0042]
Even if some trouble occurs in the playback device and the playback operation is interrupted, if the head sector of the management area is searched from the head sector number 205 of the management area and the management data is read, the processing can be performed quickly. You can resume.
[0043]
The DUT identification 210 is used when it becomes impossible to know what the current reproduction data indicates for some reason. That is, by reading this DUT identification 210, it is possible to determine what data the current DUT is reproducing. FIG. 8 is a diagram showing a detailed configuration of the DUT identification 210. As shown in the figure, the DUT identification 210 consists of 1-byte data, and its MSB indicates whether or not the DUT can be reproduced without conditions. The second bit indicates whether or not the own sector is the DUT head sector. The third and fourth bits indicate whether the data in the sector is a DUT header, sub-video, audio, or main video. Further, the fifth bit indicates whether the own sector is a management data area or a data area.
[0044]
【The invention's effect】
As described above, according to the reproducing apparatus, recording method, and reproducing method of the present invention, since at least the address information of the first sector of the next program is recorded in each sector, the program without using the information in the management table A plurality of programs can be continuously played back by knowing the playback procedure between them, and the memory for the management table can be excluded from the playback device.
[0045]
Further, since the address information of the head sector of the next program and the address information of the head sector of the next unit are recorded in each sector, reproduction can be started from any unit in the middle of the program.
[Brief description of the drawings]
FIG. 1 is a diagram showing a relationship between a physical format and a logical format on an optical disc as a recording medium according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a sector in FIG.
FIG. 3 is a diagram illustrating an example of a story management table.
FIG. 4 is a diagram illustrating an example of a program management table.
FIG. 5 is a block diagram showing an overall hardware configuration of an optical disc reproducing apparatus according to an embodiment.
FIG. 6 is a flowchart showing a processing procedure for reproducing a story.
FIG. 7 is a diagram showing a playback time management table for each program;
FIG. 8 is a diagram showing a detailed configuration of DUT identification.
FIG. 9 is a diagram showing a recording format of a conventional optical disc.
10 is a diagram showing a data stream recorded in the data area of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 ... Data unit, 102 ... DUT header, 103 ... Sub video data, 104 ... Audio data, 105 ... Main video data, 106 ... Sector, 201 ... Header, 202 ... Actual data, 203 ... Synchronous header, 204 ... SLD, 205 ... Management area start sector number, 206... Identification flag, 207... BOOK number, 208... Story number, 209... Program number, 210... DUT identification, 211 ... next program start sector number, 212. ... the first sector number of the previous program, 214 ... the first sector number of the next DUT, 215 ... the first sector number of the current DUT, 216 ... the first sector number of the previous DUT, 501 ... the optical disk, 502 ... the pickup, 503: Waveform equalization / PLL circuit, 504: Synchronous reproduction circuit, 50 ... Error correction (ECC) circuit, 506 ... Video separation circuit, 507 ... Cache memory, 508 ... Video playback circuit, 509 ... Audio playback circuit, 510 ... TV monitor, 511 ... Speaker, 512 ... Control panel, 513, 514, 518 ... Register 515... Sector determination circuit 516. Track jump signal generation circuit 517. Servo control circuit 519. DUT number calculation circuit

Claims (3)

A program composed of data including video data and audio data is recorded in units of at least one data unit composed of a plurality of sectors, and the first data constituting the first program among the programs Data having sector link data in which the unit includes address information indicating the head sector of the second data unit following the first data unit and address information indicating the head sector of the second program following the first program A playback device for playing back the data from a recording medium recorded to include a unit header,
In each sector constituting the data unit, any identification information indicating the data type of the own sector among the main video, sub-video, audio and management information is further recorded ,
Reading means for reading data from the recording medium;
And control means for controlling the data reproduction operation based on either address information indicating the head sector of the second data unit or address information indicating the head sector of the second program. Playback device. A recording method in which a program composed of data including video data and audio data is recorded on a recording medium in units of at least one data unit composed of a plurality of sectors,
Of the programs, the first data unit constituting the first program includes address information indicating the head sector of the second data unit following the first data unit and the second program following the first program. Recorded so as to include a data unit header having sector link data including address information indicating the first sector of
Recording method wherein each sector constituting the data unit, further recording the main picture, one of identification information indicating the data type of the local sector of the sub-picture, audio and management information. A program composed of data including video data and audio data is recorded in units of at least one data unit composed of a plurality of sectors, and the first data constituting the first program among the programs Data having sector link data in which the unit includes address information indicating the head sector of the second data unit following the first data unit and address information indicating the head sector of the second program following the first program A reproduction method for reproducing the data from a recording medium recorded so as to include a unit header,
In each sector constituting the data unit, any identification information indicating the data type of the own sector among the main video, sub-video, audio and management information is further recorded ,
A reproduction method characterized in that a sector is accessed using either address information indicating the first sector of the second data unit or address information indicating the first sector of the second program.

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