JP3384194B2 - Disc-shaped recording medium, and its recording method and reproducing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and reproducing compressed video, audio signals, or data used as an auxiliary storage device for a computer on a medium such as an optical disc. Regarding

[0002]

2. Description of the Related Art In order to digitally record video and audio signals on an optical disk, digital video compression is necessary because the capacity of the optical disk is not sufficient. For compression, see "Fujiwara Hiroshi, Latest MPEG Textbook, 1994".
August 1, 2015, published by Aski Publishing. " The above-mentioned prior art describes a method for compressing video and audio signals and a method for multiplexing the same. Furthermore, to facilitate random access with storage media,
It is described that the intra-picture position information and the like are recorded for each individual stream.

[0003]

However, in the above-mentioned conventional technique, since the position information is distributed and recorded on the disk, in order to read out each position information collectively, access must be repeated, and many There was a problem that it took time.

[0004]

Above problems SUMMARY OF THE INVENTION the information for facilitating random access, at the same time the dispersion to be recorded for each individual stream, centrally be recorded in a specific area of the disk Will be solved in.

[0005]

[Function] Since information for facilitating random access such as position information of an intra picture is concentratedly recorded at a specific position on the medium (for example, an area on the innermost peripheral side of the disk-shaped medium), the position information Can be read quickly and random access is easy. Also,
Since it is recorded intensively, it is highly possible that a lot of position information cannot be reproduced at the same time, but since position information with the same content is added to each individual stream,
It is extremely unlikely that the correct position information cannot be obtained due to a defect in the disc.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the present invention is shown in FIGS.
Also, description will be made with reference to FIGS. In the following description, recorded video data is picture group = GOP (Group of Pict) for each of a plurality of screen data.
ure), and one GOP includes one or more intra pictures whose compression processing is completed within one screen. 1A shows a disc in which data is spirally recorded by a recording method according to an embodiment of the present invention, and FIG. 1B shows a spiral disc in FIG. 1A. The recorded data is shown arranged on a straight line.
Further, FIG. 2A shows a disk in which data is spirally recorded by a conventional technique, and FIG. 2B shows the data recorded in the spiral disk of FIG. It is arranged and shown above. 1 and 2 show the case where the main data is divided into 24 files. In FIG. 2A, reference numeral 100 is additional information on the entire disc, which includes information on the position of each file, for example. Reference numeral 101 is ancillary information relating to the data of the first file, for example, information relating to the position of the corresponding file on the disc, information relating to the position of the intra picture of the video information included in the file, video signal, audio signal, extension, etc. It contains information about the synchronization when the signal is played. 101D is the main data of the first file. Similarly, 102, 103, ..., 123, 124
Are attached information related to the data of the second to 24th files, respectively, and are 102D, 103D, ..., 123.
D and 124D are main data of the 2nd to 24th files, respectively. Further, as shown in FIG. 2B, the attached data 101 and the main data 101D form a first file 101F. Similarly, from file 102F to 1
24F is configured. The attached information 100 is located in the lead-in area on the innermost side of the disc, and 24 files are
It is located in the data area following the lead-in area. According to the conventional technique described above, in order to access an arbitrary intra picture, the additional information 100 of the entire disc is accessed.
It is not enough to load the data into the memory of the playback system in advance, and since the attached information for each file that is distributed and recorded on the disc is required, it is necessary to repeat the access and detect all the attached information. Takes a lot of time.

In FIGS. 1A and 1B, 100, 1
01, 102, ..., 123, 124, 101D, 102
D, ..., 123D, 124D, 101F, 102F,
..., 123F, and 124F show the same elements as in FIG. 201 is ancillary information relating to the main data of the first file, and has the same format and the same contents as 101. , 224 are the same as 201, and have the same format and the same contents as 102, 103 ,. The attached information 100 of the entire disc is located in the lead-in area on the innermost side of the disc, and the attached information 201, 202, ..., 224 for each file is recorded in the area following the attached information 100 in the lead-in area. 24 files for each file follow the lead-in area,
Located in the data area. As described above, according to this embodiment, since the auxiliary information 201, ..., 224 for each file is centrally recorded in the lead-in area, the additional information 100 for the entire disc and the auxiliary information 201 for each file ,. , 2
The unit 24 can be easily loaded in the memory of the playback system in advance, and can be quickly accessed according to the position information loaded in the system memory. On the other hand, since the additional information 201, ..., 224 is intensively recorded in the lead-in area, a defect in the recording medium such as a scratch on the disk causes
At the same time, a large amount of attached information may be lost. But 2
01, ..., 224, the auxiliary information 101, ..., 124 of each file having the same content as that of 01, ..., 224 is distributed and recorded in the entire data area. At the same time, the possibility of losing a large amount at the same time is extremely low. Therefore, both high reliability and quick access can be achieved. Further, in this embodiment, the attached information of each file recorded in the lead-in area has the same format and the same content as the attached information of each file recorded in the data area. However, the attached information of each file recorded in the lead-in area may have a different format from the attached information of each file recorded in the data area. It suffices that the contents include all of a part of the ancillary information of each file recorded in the data area that needs to be collectively detected before the reproduction processing of the data area.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a reproducing apparatus for a disc recorded according to the recording method of the present invention. In FIG. 3, 1 is a disc recorded according to the recording format shown in FIG. 1, 309 is a disc motor for rotating the disc 1, 301 is an optical pickup for reading a signal from the disc 1, and 302 is an optical pickup 301.
An amplifier for amplifying a detection signal from the device, 303 is a demodulation means for performing synchronous detection and demodulation, 304 is an error correction means for performing an error correction process in accordance with an error correction code which is double added at the time of recording, and 306 is a data temporarily. R to store in
AM, 305 is an output processing means for interfacing with a video decompression means not shown in the figure, 307 is a data output terminal, 308 is a disk motor based on the cycle information of the reproduction signal detected by the demodulation means. A linear velocity constant control means (CLV control means) for controlling the disc 309 to rotate the disc 1 at a constant linear velocity, 310 is an ID code (identification code indicating the position of the corresponding signal on the disc) from the signal demodulated by the demodulation means 303. ID detection means 311 for detecting the error information, 311 an accessory information detection means for extracting accessory information from the corrected reproduction signal, 314 a system controller for controlling the entire reproducing apparatus, 315 an access for controlling the movement of the optical pickup 301. It is a control means. In this reproducing apparatus, the access control means 315 moves the optical pickup 301 to the lead-in area according to the system controller 314, and the demodulation means 303 and the correction processing means 304.
Output processing means 30 from the reproduced signal processed in
The accessory information detecting means 311 detects the accessory information (FIG. 1-100) relating to the entire disc via 5. The detected attached information passes through the signal line 312, and the information regarding the reliability of the detected attached information (a flag indicating the presence or absence of an error that cannot be corrected by the error correction means) passes through the signal line 313 and the system controller 314, respectively. Sent to.
Next, attached information for each file (Fig. 1-201-22
When reading 4), the attached information for each file recorded subsequently is reproduced without performing access control, and like the attached information regarding the entire disc (FIG. 1-100),
It is detected by the attached information detecting means 311 and the attached information is the signal line 3.
The information regarding the reliability of the attached information detected via 12 is sent to the system controller 314 via the signal line 313. Here, if the attached information for each file sent to the system controller 314 has an error, the access control means 315 according to the position information of each file included in the attached information of the entire disc detected earlier. The optical pickup 301 is moved to any of the positions shown in FIGS. After the transfer, the attached information for each file is detected by the same process and replaced with the attached information for each file in error. Therefore, in this embodiment, the attached information for each file recorded in the lead-in area (Fig. 1-201 to 224 )
By this, the additional information required for reproduction can be quickly reproduced, and the additional information for each file recorded in the lead-in area due to a scratch on the disc 1 (see Fig. 1-201-2).
24 ), even if many are lost at one time, the attached information for each file distributed and recorded in the data area (Fig. 1-
101-124 ), and realizes a playback device that can be quickly accessed.

Next, an example of the reproducing method according to the present invention will be described with reference to FIG. FIG. 4 is a flowchart showing an example of a reproduction algorithm of the reproduction device shown in FIG. Four
Reference numeral 01 indicates the movement of the optical pickup 301 to the lead-in area. The optical pickup 301 is controlled by the access control means 315 according to an instruction from the system controller 314. Reference numeral 402 denotes detection of attached information regarding the entire disc. The processes of 401 and 402 are common to the description of FIG. Reference numeral 403 denotes a process of writing the auxiliary information of the entire disc to the RAM for temporary storage (not shown in FIG. 3) of the system controller 314 for temporary storage. Reference numeral 404 indicates detection of attached information (FIGS. 1-201 to 224) regarding each file recorded in the lead-in area. 405 indicates that the system controller 314 has attached information (see FIG. 1-2) according to an error flag sent via 313.
01 to 224) is shown. All the check results are sequentially displayed on the system controller 31.
It is temporarily stored in 4. 406 is the system controller 31 that detects the attached information (FIGS. 1-201 to 224).
4 shows a process of writing in the RAM 4 for temporary storage. 407
Indicates all the ancillary information detected (Fig. 1-201-22
4) is an RA for temporary storage of the system controller 314
After the data is written in M, it is determined according to the result of the error check 405 whether or not the replacement process of the auxiliary information composed of 408, 409, and 410 is performed. For a file determined to have an error, at 408, the optical pickup 301 is operated according to the attached information of the entire disk stored in the RAM for temporary storage of the system controller 314.
The attached information in the data area (Fig. 1-101 to 124)
Move any of the above to the recorded position. 409
Indicates a process of detecting attached information of the corresponding file, and 410 indicates a process of writing in the RAM for temporary storage of the system controller 314. By way of example, if the accessory information 204 is determined that there is an error, to change the optical pickups 301 to the position associated information 104 is recorded, auxiliary information 1 04
Detects, accessory information 2 04 is overwritten into the location that is recorded in RAM for temporary storage of the system controller 314. Judgment (407) for all files
The initialization of the reproducing apparatus is completed at the time when the processing according to is completed (411, 412). The video signal is reproduced by the RAM for temporary storage of the system controller 314 by initialization.
This is performed while moving the optical pickup 301 according to the attached information recorded in (1). In the present embodiment, the processing method for collectively detecting the attached information for each file prior to the reproduction of the video data or the like is described, but only the attached information regarding the entire disc is detected at the time of initialization. The auxiliary information about a file can be reproduced even if it is sequentially read from the data area when reproducing main data such as video data.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows an example of the structure of the file shown in FIG. 1B, and FIG. 6 shows an example of the recording format of the lead-in area data when the file structure of FIG. 5 is taken. Is. First, a configuration example of a file will be described with reference to FIG. In FIG. 5, 101F, 101, and 101D show the same elements as in FIG. Files other than 101F recorded on the disc have the same configuration as 101F. Main data 101
D is divided into GOP units, and attached information about main data of each GOP is added. In FIG. 5, the main data divided into GOP units are indicated by 502, 504, and 506, and the auxiliary information regarding the main data of each GOP is 50.
1, 503, 505. The main data 502 includes video data 510, audio data 511, and extension data 512.
Consists of. Note that 504 and 506 also have the same configuration.
The auxiliary information 501 regarding the main data of the GOP includes position information 507, reproduction synchronization information 508, and video auxiliary information 50.
It consists of 9. The position information 507 is position information, such as information about the position of each divided GOP unit and information about the position of an intra picture. The reproduction synchronization information 508 is information for reproducing the video data, the audio data, and the extension data in synchronization with each other. Video attached information 5
Reference numeral 15 indicates information regarding the characteristics of the video signal. 5
03 and 505 also have the same structure. 513, 514, 5
Reference numerals 15 and 516 show an example of a structure of attached information for each file. Reference numeral 513 indicates the recording position of the corresponding file, 514 indicates the data capacity of the corresponding file, and 515
Is information regarding the characteristics of the video signal in file units, and 516 is information regarding the recording positions of the auxiliary information 501, 503, 505 in GOP units included in each file. By recording the video data with such a configuration, it is possible to detect the positions of all the intra pictures and facilitate special reproduction. Next, the format of the entire disc will be described with reference to FIG. FIG. 6 relates to the lead-in area, and the data area is shown in FIG.
A plurality of files having the same configuration as in FIG. 1 are recorded as in FIG. In FIG. 6, 100, 201, 202, ..., 22
Up to 4 is the same as in FIG. In FIG. 6, additional information 501, 503, 505, 517 for each GOP is also recorded. The GOP-unit attached information 517 is attached information regarding the last GOP of the last file on the disc.
According to the present embodiment, since the information regarding the position of each intra picture is concentratedly recorded in the lead-in area, the position information can be quickly detected when the attached information is detected in advance before the reproduction. Further, since the same attached information is written in the data area in a distributed manner, the resistance to scratches can be increased. Further, in this embodiment, the attached information of each file recorded in the lead-in area and the attached information of each GOP are the same in format and the same as the attached information of each file and the attached information of each GOP recorded in the data area. I made it the content. However, the format of the file-based and GOP-based additional information recorded in the lead-in area may be different from the format of each file and each GOP additional information recorded in the data area. It suffices that the contents include all of the files recorded in the data area and a part of the auxiliary information of each GOP that need to be collectively detected prior to the reproduction processing of the data area.

Next, referring to FIG. 7, an example of the contents of the attached information regarding the entire disc is shown. FIG. 7 shows an example of the structure of attached information about the entire disc. In FIG. 7, 10
0,201,202,224,202,101D, 10
1F, 102, 102D, 102F, 124, 124
D and 124F all show the same elements as in FIG. In the example shown in FIG. 7, the auxiliary information regarding the entire disc includes title ID 701, disc ID 702, and title 70.
3, a data capacity 704, and a file address 705. The title 703 is a title of a movie recorded with a character code. The title ID 701 is an identification code to which one number is assigned for each title. By providing a reproducing device with a means for recording the title ID 701 and the mode setting when the corresponding disc is reproduced, the disc having the same title is reproduced again. In this case, the setting conditions (subtitle language, camera angle, program playback order, sound effects, etc.) at the time of the previous playback can be automatically read and the playback can be performed immediately. The disc ID 702 is an identification code added to each disc having a digit number of such a number that it can be considered that different numbers are assigned to all the discs. For discs in which encrypted data is recorded, By using the disk ID 702 and the key signal sent through the communication line or the like as a decryption condition, it is possible to control the reproduction permission of each user through the communication line after distributing the disc to an unspecified number of users. . The data capacity 704 indicates the data capacity of the entire disc, and the file address 705 indicates the recording position of each file on the disc. File address 70
By reading 5 beforehand, each file can be accessed quickly.

[0012]

As described above, according to the present invention, it is possible to quickly detect the information regarding the position of each intra picture. Further, since the position information is recorded dispersively, the resistance to scratches is high. Therefore, in the reproducing device, quick access and special reproduction can be easily realized.

[Brief description of drawings]

FIG. 1 is a format diagram showing a method of recording information according to the present invention.

FIG. 2 is a format diagram showing a method of recording information according to a conventional technique.

FIG. 3 is a block diagram showing an information reproducing apparatus according to the present invention.

FIG. 4 is a flowchart showing a method of reproducing information according to the present invention.

FIG. 5 is a format diagram showing an information recording method according to the present invention.

FIG. 6 is a format diagram showing an information recording method according to the present invention.

FIG. 7 is a format diagram showing a method of recording information according to the present invention.

[Explanation of symbols]

100 ... Attached information of the entire disc, 101 ... Attached data of file, 101D ... Main data of file, 201 ...
File attachment data, 501 ... GOP unit attachment information, 502 ... GOP unit attachment information

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshifumi Takeuchi, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Hitachi, Ltd., Multimedia System Development Division (72) Inventor Hisazumi Tajima Totsuka, Yokohama-shi, Kanagawa 292 Yoshida-cho, Tokyo Stock company Hitachi, Ltd. Multimedia system development headquarters (56) Reference JP-A-3-88190 (JP, A) JP-A-2-62624 (JP, A) JP-A-6-243666 (JP, A) JP-A-6-44753 (JP, A) JP-A-7-87443 (JP, A) JP-A-2-206820 (JP, A) JP-A-6-44756 (JP, A) Kaihei 4-360069 (JP, A) JP-A-6-342564 (JP, A) Registered utility model 3004104 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10 G11B 27/00 H04N 5/91 H04N 5/85

Claims (6)

(57) [Claims] 1. A recording method for a disc-shaped recording medium having a first area and a second area following the first area, wherein the second area relates to main data and the main data. A plurality of files composed of file attached information are recorded, and the main data is a plurality of GOP main data and each GOP.
It is composed of GOP attached information about main data, and in the first area, first attached information containing the same contents as the file attached information and second attached information containing the same contents as the GOP attached information are concentrated. A method for recording on a disk-shaped recording medium, characterized in that the recording is performed in a recording manner. 2. A disk-shaped recording medium having a first area and a second area following the first area, wherein the second area has main data and file attachment information relating to the main data. A plurality of files each consisting of GOP are recorded, and the main data is a plurality of GOP main data and each GOP.
The first area is composed of GOP attached information related to main data, and first attached information having the same content as the file attached information and second attached information having the same content as the GOP attached information are concentrated in the first area. A disk-shaped recording medium, which is recorded on a disc. 3. The disc-shaped recording medium reproducing method according to claim 2, wherein the main data is reproduced based on the first auxiliary information recorded intensively. Reproduction method of recording medium. 4. The method of reproducing a disc-shaped recording medium according to claim 3, wherein when the first auxiliary information recorded intensively has an error, the main data is based on the file additional information. A method for reproducing a disk-shaped recording medium, characterized in that 5. The method for reproducing a disc-shaped recording medium according to claim 2, wherein the GOP main data is reproduced based on the second auxiliary information recorded intensively. Method for reproducing a recording medium. 6. The method of reproducing a disc-shaped recording medium according to claim 5, wherein when the second auxiliary information recorded intensively has an error, the GOP master is based on the file additional information. A method for reproducing a disk-shaped recording medium, which comprises reproducing data.