JP2003178534A - Reproducing apparatus, recording method and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing apparatus, a recording method and a reproducing method for a recording medium with a format structure by which a memory for storing a management table can be excluded from the reproducing apparatus. <P>SOLUTION: The reproducing apparatus is used for an optical disk on which data including video and audio data are recorded in the unit of variable length DUTs (Data Units) each comprising a plurality of sectors 106, and each sector 106 is recorded as SLD (Sector Link Data) 204 with: a management area head sector number 205; an identification flag 206; a BOOK number 207; a story number 208; a program number 209; a DUT identification 210; a succeeding program head sector number 211; a current program head sector number 212; a one-preceding program head sector number 213; a succeeding DUT head sector number 214; a current DUT head sector number 215 and a one-preceding DUT head sector number 216. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus, a recording method and a reproducing method for, for example, an optical disc.

[0002]

2. Description of the Related Art In recent years, a disc reproducing device for reproducing an optical disc on which audio and video are recorded has become widespread and is widely used as a reproducing device for movie software, karaoke and the like. Recently, a device for reproducing an optical disc in which audio and video data is digitally recorded has appeared, and is commercially available as, for example, a karaoke system. Since this optical disc has the same size as a CD (compact disc), it has an advantage that the entire apparatus can be downsized.

FIG. 9 is a diagram showing a recording format of such an optical disc. As shown in the figure, this recording format comprises 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. The data area 3 for recording compressed video and compressed audio data corresponds to tracks (programs) 2 to 99 at maximum. As shown in FIG. 10, each track (program) of the data area 3 is physically divided into sector units of video data V.
And the audio data A are arrayed, and 1 is placed after 6 consecutive video sectors V so that the video and audio can be synchronized.
One audio sector A is regularly arranged.

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 disc reproduction, the disc reproducing device reads the management table into the memory in advance and continuously reproduces each program according to the procedure indicated by the management table. Therefore, the disk reproducing device requires a large capacity memory capable of storing all the contents of the management table.

In addition, the compression coding of audio data and video data is performed by MPEG (Moving Picture) which is an international standard.
Image Coding Expert Group) 1 system is adopted. This is a method of compressing data in a variable length. Here, in order to improve random accessibility, it is theoretically possible to manage on the management table even the position (bit) of which sector a GOP (Group Of Picture), which is a coding unit of MPEG video, is located. It is possible. However, when such a management table is constructed, the processing on the system side becomes complicated, and more memory capacity is required. For this reason, it is practically limited to managing this on a program unit basis.

[0006]

As described above, the prior art is as follows.
It is necessary to provide the playback device with a large memory for storing the contents of the management table recorded in the recording medium.
Further, the management of data on the management table is limited to being performed in program units, and there is a drawback in that random accessibility is lacking.

The present invention is intended to solve such a problem, and an object of the present invention is to provide a reproducing apparatus, a recording method and a reproducing method for a recording medium capable of eliminating a memory for storing a management table from the reproducing apparatus. .

Another object of the present invention is to provide a reproducing apparatus, a recording method, and a reproducing method for a recording medium, which has random accessibility and can start reproduction from an arbitrary unit in the middle of a program.

[0009]

In order to achieve the above object, the reproducing apparatus of the present invention is a recording in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors. A medium, wherein a first data unit of the data units constitutes a first program and includes a data unit header relating to the first data unit, and the data unit header includes sector link data. The sector link data is a reproducing device for reproducing data from a recording medium in which address information indicating a first sector of a second program following the first program is recorded, and the sector link data is reproduced from the recording medium. A reading mechanism for reading data and a control mechanism for controlling the operation of reproducing the data based on the address information are provided. And it is characterized in Rukoto. Further, the reproducing apparatus of the present invention is a recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and the first data of the data unit is recorded. The unit constitutes a first program and includes a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes the first data unit. A reproducing apparatus for reproducing data from a recording medium recorded with address information indicating a leading sector of a second data unit following, which is based on the reading mechanism for reading data from the recording medium and the address information. And a control mechanism for controlling the operation of reproducing the data. Further, the reproducing apparatus of the present invention is a recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors,
A first data unit of the data units constitutes a first program and includes a data unit header relating to the first data unit, the data unit header including sector link data, and the sector link. A reproducing apparatus for reproducing data from a recording medium in which address data indicating a first sector of a second data unit preceding the first data unit is included in the data, and the data is reproduced from the recording medium. A reading mechanism for reading and a control mechanism for controlling the operation of the data reproduction based on the address information are provided.

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, or the address of the head sector of the immediately preceding unit. Information.

In 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 immediately preceding program, and the logical format of the data of its own sector are used. It is also possible to further record the information indicating the type and the address information of the first sector of the management area.

Further, in order to achieve the above-mentioned object, the recording method of the present invention is a recording method of recording data including video data and audio data on a recording medium in a unit of a data unit composed of a plurality of sectors. A first data unit of the data units constitutes a first program and includes a data unit header relating to the first data unit; the data unit header includes sector link data; The data is characterized in that it includes address information indicating a leading sector of a second program following the first program. Further, the recording method of the present invention is a recording method of recording data including video data and audio data on a recording medium in units of a data unit composed of a plurality of sectors, wherein Data units of the first data unit include a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data follows the first data unit. Second
The address information indicating the first sector of the data unit is included. Further, the recording method of the present invention is a recording method of recording data including video data and audio data on a recording medium in units of a data unit composed of a plurality of sectors, wherein Data units of the first data unit include a data unit header of the first data unit, the data unit header includes sector link data, and the sector link data precedes the first data unit. It is characterized in that it includes address information indicating the head sector of the second data unit.

In order to achieve the above-mentioned object, the reproducing method of the present invention is a recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, A first data unit of the data units constitutes a first program and includes a data unit header relating to the first data unit, the data unit header including sector link data, and the sector link. A reproduction method for reproducing data from a recording medium in which data includes first address information indicating a first sector of a second program following the first program, wherein the address information is used. It is provided with means for accessing the sector. Further, the reproducing method of the present invention is a recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and the first data of the data unit is recorded. The unit constitutes a first program and includes a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes the first data unit. What is claimed is: 1. A reproducing method for reproducing data from a recording medium, which is recorded by including address information indicating a leading sector of a succeeding second data unit, comprising a means for accessing a sector by using the address information. Is. Also,
A reproducing method of the present invention is a recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and a first data unit of the data units is The first program comprises a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data precedes the first data unit. A reproducing method for reproducing data from a recording medium in which address information indicating the first sector of the second data unit is included, the method comprising accessing the sector using the address information. is there.

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, the management table is read by reading this address information at the time of reproduction, for example. It is possible to continuously reproduce a plurality of programs by knowing the reproduction procedure between the programs without using the information of. Therefore, the memory for the management table can be excluded from the playback device.

Further, in the recording medium of the present invention, in addition to the address information of the leading sector of the next program, at least the address information of the leading sector of the next unit is recorded in each sector. It is possible to start playback from any unit of. That is, for example, upon reproduction, if a request to switch to program reproduction after T time is accepted, the head sector of the program after this T time is obtained, and then this head sector is searched through a track jump to find the head sector. 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]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a relationship between a physical format and a logical format on an optical disc which is a recording medium of an embodiment according to the present invention.

In the figure, reference numeral 100 is a data stream recorded on an optical disk. This data stream 100 is composed of an array of variable-length data units (hereinafter referred to as DUTs) 101. Due to the logical format, the DUT 101 has a DUT header 102, sub-picture data 103,
It is composed of audio data 104 and main video data 105. The sub video data 103, the audio data 104, and the main video data 105 are variable-length compressed data, and the signal lengths of these are defined based on a predetermined reproduction time. Further, each data in the DUT 101 is composed of a plurality of sectors 106 in the physical format.

FIG. 2 is a diagram showing the structure of the sector 106. The sector 106 is composed of a header 201 and actual data 202. The header 201 is composed of a sync header 203 in which a number of the sector 106 and a sync signal for sync generation at the time of data reproduction are recorded, and sector link data (hereinafter referred to as SLD) 204. SLD204
Indicates the management area start sector number 205 and the identification flag 20.
6, BOOK number 207, story number 208, program number, DUT number 209, DUT identification 210, next program start sector number 211, current program start sector number 212, previous program start sector number 213, next DUT Head sector number 214 of the current DU
Each of the areas includes a head sector number 215 of T and a head sector number 216 of the immediately preceding DUT.

Here, the story number 208 and the program number 209 will be described. A story is a group of video and audio data related in a logical format. Specifically, a movie or the like corresponds to this. There are one or more of this story on one disc. The story is composed of multiple programs. Here, it is possible to share a part of the video and audio in a plurality of stories.

For example, it is assumed that two stories A and B are recorded, and that one story A contains a violent scene which is likely to cause youth problems.
In this case, the video and audio (program) is exactly the same as that of the story A except for the violent scene, but the violent scene in question can be replaced with another video and audio (program) and recorded as the other story B. .

FIG. 3 is a diagram showing an example of the 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 scenes, and in the story B, the programs 7 and 8 of the scenes having no problem are replaced. In this case, programs 0, 1, 2, 5, and 6 are shared by stories A and B,
Efficient use of disk capacity.

FIG. 4 is a diagram showing an example of the program management table recorded in the management area on the optical disk. As shown in the figure, each program 0 to N is stored in this table.
The start sector number and end sector number of are registered.

Next, a reproducing apparatus for an optical disc having such a recording format will be described. FIG. 5 is a block diagram showing the overall hardware configuration of this optical disk reproducing apparatus.

In the figure, 501 is an optical disk, and 50 is
Reference numeral 2 denotes a pickup that irradiates the optical disc 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 waveform equalized / PLL
The data is input to the circuit 503, where it is subjected to waveform equalization, data slicing, etc., and is sent to the synchronous reproduction circuit 504 as a data stream. The sync reproducing circuit 504 extracts the sync header 203 of the sector shown in FIG.
Is detected and the data to be reproduced is supplied to the error correction (ECC) circuit 505. If there is an error in the data, the error is corrected and the correction result is displayed in the video separation circuit 50.
Pass to 6. 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 the video reproduction circuit 508 and the audio reproduction circuit 5 respectively.
09 are read out in accordance with a request from each of them and subjected to necessary signal processing in the video reproduction circuit 508 and the audio reproduction circuit 509, and then the TV monitor 510 and the speaker 5
Reproduced by 11.

FIG. 6 is a flow chart showing a processing procedure for reproducing a story. In this case, first, a story is 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). Then, 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. After that, the start sector number PS of the first program stored in the register 514 is set to the sector determination circuit 51.
Set to 5 (step 603).

The track jump signal generation circuit 516 is
The number TN of tracks to be jumped is calculated based on the start sector number PS set in the sector determination circuit 515 (step 604), and the servo control circuit 517 receives about TN.
The jump signal is supplied so that only the track jumps. As a result, the pickup 502 jumps to the vicinity of the target track (step 605).

When the pickup 502 reaches the vicinity of the target track, the synchronous reproducing 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).

Here, the sector determination circuit 515 determines whether the sector number SX stored in the register 518 satisfies the following conditions (step 607). PS-N
<SX ≦ PS (where N: 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,
Let the track jump again.

If the reproduction sector number SX satisfies the above condition, the reproduction of the sector number SX is continued as it is (step 609). After that, if the reproduction sector number SX matches the start sector number PS of the program (step 6).
08), video and audio data is reproduced (step 61).
1). When the DUT at the program end is exceeded (step 610), the reproduction of video and audio is stopped and the process returns to the start flow of the next program. Since the time for shifting from the current program to the next program is short, the reproduced video / audio on the TV is apparently uninterrupted.

The program end can be determined by detecting the story number 208, the program number, and the DUT number 209 of the SLD 204 shown in FIG. The start sector number of the next program is S
Since it can be known from the next program head sector number 211 in the LD 204, this number 211 is stored in the register 514,
Further, this number 211 is read by the sector determination circuit 515 and the processing is continued. Since the number of programs is recorded in the register 513, when the number of reproduction programs reaches this number and the reproduction of video and audio is completed (step 612), the entire reproduction is ended.

As another embodiment of the optical disc reproducing apparatus, if the program termination code (for example, all "1") is inserted in the next program start sector number 211 of the SLD 204 of the sector in the final program, the number of programs of the story is increased. The area for recording is unnecessary on the disk, and the circuit for registering this information is unnecessary in terms of hardware.

As described above, according to the present embodiment, by recording the SLD 204 having the configuration shown in FIG. 2 in each sector, it is necessary to provide the optical disc reproducing apparatus with a large capacity memory for storing the management table. Disappear.

Further, according to this embodiment, the time T
If you want to play after s seconds, you can easily access it. The operation in this case will be described below.

First, a control panel 512 sets a reproduction request after Ts seconds. Then, the DUT number calculation circuit 51
9 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, by referring to this, it is possible to calculate which program is after Ts seconds. The management table shown in FIG. 7 may indicate the reproduction time by the number of DUTs.

For example, in the reproduction of story A, Ts = 10
The case of reproducing after 00 seconds will be described. Here, it is assumed that the current program number is 0 and the DUT number is 20, and the specific contents of the management table in FIG. 7 are as follows.

Play time of program 0 = 200 seconds Play time of program 1 = 300 seconds Play time of program 2 = 100 seconds Play time of program 3 = 400 seconds Play time of program 4 = 300 seconds Then, from the current DUT to program 0 Assuming that the reproduction time of 1 DUT is 0.5 seconds, the reproduction time T0 until the end of is 0 = 200−0.5 × 20 = 190 seconds. Therefore, T0 + T1 + T2 + T3 = 990 seconds, and after Ts = 1000 seconds, 1 after the start of program 4.
It will be sufficient to play back at 0 seconds. That is,
It becomes 10 / 0.5 = 20 in DUT conversion, and it is sufficient to reproduce from DUT number 21 of program 4.

If the target program number and DUT number can be calculated in this way, then the start sector number of program 4 is read from the program management table of FIG.
Set this to 15.

The track jump signal generation circuit 516 is
The track TN to be jumped is calculated from the start sector number SD set in the sector determination circuit 515, and a jump signal is supplied to the servo control circuit 517 so as to jump about TN tracks. This causes the pickup 502 to jump near the target track. After that, the sector is reproduced at the jump destination, and when the reproduction sector number coincides with 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 operation.
Then, the target 21st DUT head sector is detected and video and audio data is reproduced. As described above, reproduction is performed after Ts seconds. When this Ts is shortened, double speed reproduction or quadruple speed reproduction becomes possible.

Further, in the present embodiment, the following sector search can be performed by using other information in the SLD 204.

For example, the current program top sector number 21
From 2, it is possible to search for the first sector of the program that has been reproduced until then, and reproduce again from the beginning of the same program. Similarly, from the head sector number 213 of the immediately preceding program, the head sector of the immediately preceding program of the program that has been reproduced can be searched. Further, the head sector number 215 of the current DUT is searched for the head sector of the DUT including the sector that has been reproduced so far, or the head sector number 214 of the previous DUT includes the sector that has been reproduced until then. It is also possible to search for the head sector of the DUT immediately before.

Even if some trouble occurs in the reproducing apparatus and the reproducing operation is interrupted, if the management area head sector number 205 is searched for the head sector of the management area and the management data is read, processing is performed. Can be restarted promptly.

The DUT identification 210 is used when it is impossible to know what the currently reproduced data indicates for some reason. That is, by reading this DUT identification 210, it is possible to determine what the current DUT is reproducing. Figure 8 shows this DUT
It is a figure which shows the detailed structure of the 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 any condition. The second bit indicates whether or not the own sector is the DUT head sector. The 3rd and 4th bits indicate whether the data of the own sector is a DUT header, sub-picture, audio, or main picture. Further, the fifth bit indicates whether the own sector is the management data area or the data area.

[0044]

As described above, the reproducing apparatus of the present invention,
According to the recording method and the reproducing method, at least the address information of the first sector of the next program is recorded in each sector, so that a plurality of programs can be continuously executed by knowing the reproducing procedure between the programs without using the information in the management table. It can be played back, and the memory for the management table can be eliminated from the playback device.

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 an arbitrary unit in the middle of the program. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a physical format and a logical format on an optical disc which is 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 showing an example of a story management table.

FIG. 4 is a diagram showing 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 reproduction time management table of 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. 9. FIG.

[Explanation of symbols]

101 ... Data unit, 102 ... DUT header, 10
3 ... Sub video data, 104 ... Audio data, 105 ... Main video data, 106 ... Sector, 201 ... Header, 202 ...
Actual data, 203 ... Sync header, 204 ... SLD, 20
5 ... Management area start sector number, 206 ... Identification flag,
207 ... BOOK number, 208 ... Story number, 20
9 ... Program number, 210 ... DUT identification, 211 ... Next program start sector number, 212 ... Current program start sector number, 213 ... Previous program start sector number, 214 ... Next DUT start sector number, 215
... start sector number of current DUT, 216 ... one previous DUT
Head sector number, 501 ... Optical disk, 502 ... Pickup, 503 ... Waveform equalization / PLL circuit, 504 ... Synchronous reproduction circuit, 505 ... Error correction (ECC) circuit, 50
6 ... Video separation circuit, 507 ... Cache memory, 508
… Video playback circuit, 509… Audio playback circuit, 510… TV
Monitors, 511 ... Speakers, 512 ... Control panels, 513, 514, 518 ... Registers, 515 ... Sector determination circuits, 516 ... Track jump signal generation circuits, 517 ... Servo control circuits, 519 ... DUT number calculation circuits.

Continued front page    F-term (reference) 5D044 AB07 BC03 CC06 DE03 DE48                       DE54 FG18 GK12 GL28                 5D110 AA15 AA27 AA29 BB01 DA04                       DA12 DB05 DC05 DE04 EA07

Claims (12)

[Claims] 1. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and a first data unit of the data units is a first data unit. And a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes a second program following the first program. Is a reproducing device for reproducing data from a recording medium in which address information indicating the first sector of the recording medium is recorded, the reading device reading data from the recording medium, and the operation of reproducing the data based on the address information. A reproducing apparatus comprising a control mechanism for controlling. 2. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is a first data unit. And a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data includes a second data unit following the first data unit. A reproducing device for reproducing data from a recording medium recorded with address information indicating a head sector of a data unit, comprising a reading mechanism for reading data from the recording medium, and a reproducing mechanism for reproducing the data based on the address information. A reproducing apparatus comprising a control mechanism for controlling the operation. 3. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and a first data unit of the data units is a first data unit. And a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes a second data preceding the first data unit. A reproducing device for reproducing data from a recording medium recorded with address information indicating the first sector of the data unit, the reading mechanism reading data from the recording medium, and reproducing the data based on the address information. And a control mechanism for controlling the operation of the reproducing apparatus. 4. A recording method for recording data including video data and audio data on a recording medium in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is The first program includes a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data includes a second program subsequent to the first program. A recording method characterized by including address information indicating a head sector. 5. A recording method for recording data including video data and audio data on a recording medium in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is The first program comprises a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data is second data following the first data unit. A recording method characterized by including address information indicating a head sector of a unit. 6. A recording method of recording data including video data and audio data on a recording medium in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is A second program that comprises a first program and includes a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data precedes the first data unit. A recording method characterized by including address information indicating a head sector of a data unit. 7. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, and a first data unit of the data units is a first data unit. And a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes a second program following the first program. Is a reproducing method for reproducing data from a recording medium in which the first address information indicating the first sector of the sector is recorded, the reproducing method comprising means for accessing the sector using the address information. Method. 8. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is a first data unit. And a data unit header relating to the first data unit, the data unit header includes sector link data, and the sector link data includes a second data unit following the first data unit. A reproducing method for reproducing data from a recording medium in which address information indicating the first sector of a data unit is recorded, the reproducing method comprising means for accessing a sector using the address information. . 9. A recording medium in which data including video data and audio data is recorded in a unit of a data unit composed of a plurality of sectors, wherein a first data unit of the data units is a first data unit. And a data unit header related to the first data unit, the data unit header includes sector link data, and the sector link data includes a second data preceding the first data unit. A reproducing method for reproducing data from a recording medium in which address information indicating the first sector of the data unit is recorded, the reproducing method comprising means for accessing the sector using the address information. Method. 10. The reproducing apparatus according to claim 1, wherein each sector constituting the data unit has a main sector, sub-image, audio and management information of its own sector. A reproducing apparatus characterized by further recording any identification information indicating a data type. 11. The recording method according to any one of claims 4 to 6, wherein each sector constituting the data unit has data of its own sector among main video, sub-video, audio and management information. A recording method characterized by further recording any identification information indicating a type. 12. The reproducing method according to any one of claims 7 to 9, wherein each sector constituting the data unit has its own sector among main video, sub-video, audio and management information. A reproducing method characterized in that any one of identification information indicating a data type is further recorded.