JP3169368B1 - Optical disk recording system and optical disk reproducing system - Google Patents

Abstract

An information recording medium suitable for an optical disk such as a DVD and capable of reading out recording date and time information of a program indispensable for menu display at a high speed is provided. Further, the present invention provides an apparatus and a method for recording or reproducing recording date information on the information recording medium. SOLUTION: Management information (RTR.IFO) is recorded for each stream data in a DVD-RAM, and the recording date and time (VOB_REC_TM) of the first display video frame of each stream data is stored in the management information.
Furthermore, a field (VOB_REC_TM_SU) for storing an error of recording date and time information generated when editing processing such as partial erasure is performed in the management information.
B) was provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium such as a readable / writable optical disk, and more particularly to a recording medium on which multimedia data including moving image data is recorded.
The present invention relates to a recording method and a reproducing method for the recording medium.

[0002]

2. Description of the Related Art In the field of rewritable optical disks, the upper limit of which is about 650 MB, a phase change disk DVD-RAM having a capacity of several GB has appeared. Digital A
With the practical application of MPEG (MPEG2), which is an encoding standard for V data, DVD-RAM is expected not only as a computer application but also as a recording / playback medium in the AV field. In other words, it is expected to spread as a medium that replaces the magnetic tape, which is a conventional typical AV recording medium.

(Description of DVD-RAM) In recent years, the density of rewritable optical disks has been increased, and not only computer data and audio data but also image data can be recorded.

For example, an uneven guide groove is conventionally formed on a signal recording surface of an optical disk. Conventionally, a signal was recorded only in either a convex portion or a concave portion, but a signal can be recorded in both the convex and concave portions by the land / groove recording method. As a result, the recording density was improved about twice (see, for example, JP-A-8-7282).
In addition, a zone CLV method that simplifies control of a CLV method (constant linear velocity recording) effective for improving recording density and facilitates practical use has been devised and put into practical use (for example, Japanese Patent Application Laid-Open No. 7-93873). Gazette).

[0005] A major challenge in the future is how to record AV data including image data by using such optical disks aiming at increasing the capacity and to realize performance and new functions that greatly exceed conventional AV equipment.

With the advent of such a large-capacity and rewritable optical disk, it is conceivable that AV recording / reproduction is mainly performed by an optical disk instead of a conventional tape. The transition of recording media from tape to disk has various effects on the functions and performance of AV equipment. The greatest feature in the transition to a disk is a significant improvement in random access performance. In the case of random access to the tape, it usually takes several minutes to rewind one tape. This is orders of magnitude slower than the seek time (several tens of ms or less) in optical disk media. Thus, tape cannot be a random access device in practice. With such random access performance, distributed recording of AV data, which was impossible with a conventional tape, has become possible with an optical disc.

FIG. 34 is a block diagram of a drive device of a DVD recorder. In the figure, reference numeral 11 denotes an optical pickup for reading data from a disk, and reference numeral 12 denotes an ECC (error).
a correcting code) processing unit; 13, a track buffer; 14, a switch for switching input and output to and from the track buffer; 15, an encoder; and 16, a decoder. 17 shows a part of the disk in an enlarged manner.

As shown in FIG. 17, data is recorded on a DVD-RAM disk with 1 sector = 2 KB as a minimum unit. Further, the ECC processing unit 12 performs error correction processing as 16 sectors = 1 ECC block.

The track buffer shown in FIG.
A buffer for recording AV data at a variable bit rate in order to more efficiently record AV data on a RAM disk. While the read / write rate to the DVD-RAM (Va in the figure) is a fixed rate, the bit rate (Vb in the figure) of the AV data changes according to the complexity of the content (image in the case of video). I do. The track buffer 13 is a buffer for absorbing the difference between the bit rates. For example, when AV data is set to a fixed bit rate like a video CD, it becomes unnecessary.

If the track buffer 13 is used more effectively, it is possible to arrange AV data discretely on a disk. This will be described with reference to FIG.

FIG. 35A shows an address space on a disk. As shown in FIG. 35 (a), when AV data is recorded in a continuous area of [a1, a2] and a continuous area of [a3, a4], the track is tracked while seeking from a2 to a3. By supplying the data stored in the buffer 13 to the decoder section 16, continuous reproduction of AV data becomes possible. FIG. 35B shows the state at this time.

The AV data read from a1 starts to be input to the track buffer 13 and output from the track buffer 13 at time t1, and the input rate (Va) to the track buffer 13 and the output from the track buffer 13 Rate difference of rate (Vb) (Va−V
Data is accumulated in the track buffer 13 for the amount of b). This state continues until a2 (time t2).
Assuming that the amount of data stored in the track buffer 13 during this time is B (t2), the time t at which a3 can be read is started.
For up to 3, B stored in the track buffer 13
It is only necessary that (t2) be consumed and supplied to the decoder unit 16.

In other words, if the data amount ([a1, a2]) to be read before the seek is at least a certain amount, continuous supply of AV data is possible even when a seek occurs.

In this embodiment, an example in which data is read from the DVD-RAM, that is, the data is reproduced has been described.
-Writing data to the RAM, that is, recording, can be similarly considered.

As described above, in a DVD-RAM, as long as data of a certain amount or more is continuously recorded, continuous reproduction / recording is possible even if AV data is recorded on a disk in a distributed manner.

(Explanation of MPEG) Next, the AV data will be described. As described above, the AV data recorded on the DVD-RAM is MPEG (ISO / IEC1381).
Use an international standard called 8).

Even a DVD-RAM having a large capacity of several GB cannot be said to have a sufficient capacity to record uncompressed digital AV data as it is. Therefore, a method of compressing and recording AV data is required.
MPEG (ISO / IE) is used as a compression method for AV data.
C13818) has become widespread in the world. Recent L
MPEG technology (decompression / decompression)
Compression LSI) has come into practical use. This has enabled MPEG expansion / compression in DVD recorders.

MPEG has the following two main features to realize highly efficient data compression.

First, in compressing moving image data, a compression method using a time correlation characteristic between frames is adopted in addition to a compression method using a spatial frequency characteristic which has been conventionally performed. . In MPEG, each frame (M
In PEG, a picture is called an I picture (intra-frame coded picture), a P picture (picture using intra-frame coding and a reference relationship from the past), and a B picture (intra-frame coding and reference from the past and future). Data using the relationship).

FIG. 36 is a diagram showing the relationship among I, P, and B pictures. As shown in FIG. 36, the P picture refers to the closest I or P picture in the past, and the B picture refers to the closest I or P picture in the past and the future, respectively. Further, as shown in FIG. 36, since the B picture refers to a future I or P picture, a phenomenon occurs in which the display order of each picture does not match the order of the compressed data (coding order). .

The second feature of MPEG is that dynamic code amount allocation according to the complexity of an image can be performed on a picture basis. The MPEG decoder includes an input buffer, and by storing data in the decoder buffer in advance, it is possible to allocate a large amount of code to a complicated image that is difficult to compress.

The audio data used in the DVD-RAM can be selected from three types: MPEG audio for data compression, Dolby Digital (AC-3), and uncompressed LPCM. Dolby Digital and LPCM
Has a fixed bit rate, but MPEG audio has a variable bit rate and is not as large as a video stream, but its size can be selected from several sizes in audio frame units.

Such AV data is multiplexed into one stream by a method called an MPEG system. FIG. 37 is a diagram showing the configuration of the MPEG system. 41 is a pack header, 42 is a packet header, and 43 is a payload. The MPEG system has a hierarchical structure called a pack or a packet. The packet is composed of a packet header 42 and a payload 43. The AV data is divided into appropriate sizes from the beginning, and the payload 4
3 is stored. The packet header 42 has a payload 43
As information on the AV data stored in the storage device, an ID (stream I) for identifying the stored data is used.
D) and the decoding time DTS (Decodin) of the data contained in the payload expressed with an accuracy of 90 kHz.
g Time Stamp) and display time PTS (P
A “retention time stamp” (DTS is omitted when decoding and display are performed simultaneously like audio data) is recorded. A pack is a unit that combines a plurality of packets. DVD-RA
In the case of M, since one packet is used as one pack, each pack is composed of a pack header 41 and a packet (packet header 42 and payload 43). In the pack header, the time at which the data in this pack is input to the decoder buffer is represented by S, which is represented with an accuracy of 27 MHz.
CR (System Clock Reference)
e) is recorded.

In the case of such an MPEG system stream in a DVD-RAM, one pack is divided into one sector (= 2048).
Record as B).

Next, a decoder for decoding the above-mentioned MPEG system stream will be described. FIG. 38 shows a decoder model (P-ST) of the MPEG system decoder.
D). STC 51 is a reference time in the decoder
(System TimeClock), 52 is a demultiplexer for decoding a system stream, that is, demultiplexing, 53 is an input buffer of a video decoder, 54 is a video decoder, 55 is a data order generated between I, P and B pictures. Buffer to temporarily store I and P pictures in order to absorb the difference between the display order and the display order; 56, a switch for adjusting the output order of I, P pictures and B pictures in the reorder buffer; 57, an input to the audio decoder The buffer 58 is an audio decoder.

Such an MPEG system decoder is
The above-described MPEG system stream is processed as follows. When the time of the STC 51 matches the time of the SCR described in the pack header, the demultiplexer 52
Inputs the pack. The demultiplexer 52 decodes the stream ID in the packet header and transfers the data of the payload to the decoder buffer for each stream. Also, PTS and DTS in the packet header
Take out. The video decoder 54 takes out the picture data from the video buffer 53 at the time when the DTS coincides with the time of the STC 51, performs decoding processing, stores the I and P pictures in the reorder buffer 55, and displays and outputs the B picture as it is. The switch 56 is connected to the reorder buffer 55 side when the picture decoded by the video decoder 54 is an I or P picture, and outputs the previous I or P picture in the reorder buffer 55. 54 side. The audio decoder 58, like the video decoder 54,
At the time when the time of C51 coincides with the PTS (there is no DTS for audio), data for one audio frame is extracted from the audio buffer 57 and decoded.

Next, a method of multiplexing the MPEG system stream will be described with reference to FIG. FIG. 39 (a)
Is the video frame, (b) is the state in the video buffer,
(C) shows an MPEG system stream, and (d) shows audio data. The horizontal axis shows a time axis common to each figure, and each figure is drawn on the same time axis. Also, as shown in FIG. 39B, the vertical axis indicates the buffer occupancy (the amount of data stored in the video buffer), and the thick line in the figure indicates the temporal transition of the buffer occupancy. The slope of the bold line corresponds to the video bit rate, indicating that data is being input to the buffer at a constant rate. The fact that the buffer occupancy is reduced at regular intervals indicates that data has been decoded.
The intersection of the diagonal dotted line and the time axis indicates the start time of data transfer of the video frame to the video buffer.

Hereinafter, a complicated image A in video data will be described as an example. As shown in FIG. 39 (b), since the image A requires a large amount of code, the data transfer to the video buffer must be started from time t1 in the figure before the decoding time of the image A. (The time from the data input start time t1 to the decoding is called vbv_delay) As a result, the AV data is multiplexed at the position (time) of the video pack indicated by oblique lines. On the other hand, the transfer of audio data that does not require dynamic code amount control such as video does not need to be particularly advanced earlier than the decode time, and thus is generally multiplexed slightly before the decode time. . Therefore, the video data and the audio data reproduced at the same time are multiplexed in a state where the video data precedes. In MPEG, the time during which data can be stored in a buffer is limited, and it is defined that all data except for still image data must be output from the buffer to the decoder within one second after being input to the buffer. ing. Therefore, the difference in multiplexing of the video data and the audio data is at most 1 second (strictly speaking, there may be a further shift by the reordering of the video data).

In this example, the video precedes the audio. However, it is theoretically possible that the audio precedes the video. When a simple image having a high compression ratio is prepared for video data and the audio data is unnecessarily quickly transferred, such data can be intentionally created. However, MPE
Due to the constraint of G, a maximum of 1 second can precede.

(Description of Tape Medium) Next, the tape medium will be described. FIG. 40 is an explanatory diagram of a tape widely used for conventional AV recording. Roughly speaking, the tape is allocated a recording band for each data in the running direction and horizontally, and is composed of a video recording band, an audio recording band, and a time code recording band. In the time code recording band, the recording date and time corresponding to each video frame recorded in the video recording band is recorded in the time code recording band. By displaying the time code information as the corresponding video information, the user can know when the currently viewed video was recorded.

[0031]

The greatest feature of a DVD recorder is its random access performance, which enables high-speed access to a desired location of a user, which could not be achieved with a conventional tape medium.

A menu is used to effectively bring out this random access function. FIG. 41 shows an example of a menu display on the DVD recorder. The DVD recorder displays a list of program information recorded on the DVD-RAM. When the user selects a desired program from the programs displayed on the menu, the DVD recorder seeks to the AV data of the selected program and starts reproduction.

One of the essential information in this menu is recording date and time information as shown in FIG. For example, in the case of a disc on which a serial drama is recorded, the user can watch programs in the order of recording by referring to the recording date and time.

However, in the random access function of the DVD recorder, one seek takes several hundred milliseconds. At this time, the recording date and time information for displaying the menu is taken out, so that it cannot be said that it is fast enough to repeat the seek to each program. For example, DVD-
When 100 programs are recorded in the RAM and the time required for seeking to each program is 500 milliseconds, 50 seconds (= 500 milliseconds × 500 milliseconds) is required to collect the recording date and time information of all programs.
100 times). That is, the menu screen is displayed for the first time after the user inserts the DVD-RAM into the DVD recorder and waits 50 seconds, and the DV
It is hard to say that the access performance, which is the greatest feature of the D recorder, is effectively used.

The present invention has been made to solve the above problems, and is a recording medium suitable for an optical disk such as a DVD, which enables high-speed reading of recording date and time information of recorded AV data. It is an object to provide an information recording medium. Another object of the present invention is to provide an apparatus and a method for recording or reproducing recording date and time information on or from such an information recording medium.

In order to solve the above-mentioned problem, an optical disk recording system according to the present invention provides a video data of a video composed of a plurality of frames and a date and time when a first frame of the plurality of frames is recorded. An optical disc on which management information including recording date / time information is recorded, wherein the recording date / time information is date / time information for storing information of year / month / day / hour / minute / second of the recording date / time of the first frame, and An optical disc including date and time error information that cannot be represented by date and time information and stores information of a fraction of one second or less of the recording date and time of the first frame, and an instruction from a user to delete a part of the video recorded on the optical disc. Input means for inputting, and updating the recording date and time information when the leading frame is included in a part of the video to be erased based on the instruction And a that updating means. When a plurality of consecutive frames including the first frame is deleted, the updating unit sets the information stored in the date and time information to one second or more of the time length of the deleted frame. Change the time and the time indicated by the date and time information of the first frame to information of a first time, and replace the information stored in the date and time error information with one of the time lengths of the deleted frame. The information may be changed to information of a second time obtained by adding a time shorter than seconds and a time indicated by the date and time error information of the first frame. When the second time exceeds one second, the updating unit updates the information stored in the date and time information to information of a third time obtained by adding one second to the first time, The information stored in the date and time error information may be updated to information of a fourth time obtained by subtracting one second from the second time. The date and time error information may be represented by the number of fields. The date and time error information may be represented by a time stamp. In order to solve the above problem, an optical disc playback system according to the present invention includes video data of a video composed of a plurality of frames, and information on a date and time when a first frame of the plurality of frames was recorded. An optical disc on which management information including recording date and time information is recorded, wherein the recording date and time information is date and time information for storing information of year, month, day, hour, minute, and second of the recording date and time of the first frame;
And an optical disk that cannot be represented by the date and time information and includes date and time error information that stores information of a fraction of one second or less of the recording date and time of the first frame, and when playing back video from the optical disk, There are provided means for calculating the recording date and time information of the frame being reproduced by adding the reproduction time from the first frame to the value of the recording date and time information, and means for combining the calculated recording date and time information with the video.

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a DVD recorder and a DVD-RA according to an embodiment of the present invention will be described with reference to the accompanying drawings.
M will be described in detail.

(Logic Configuration on DVD-RAM) First, DV
The logical configuration on the D-RAM will be described with reference to FIG. FIG. 1 shows the physical sector addresses on the disk and the data structure on the disk as seen through the file system.

At the head of the physical sector address, there is a lead-in area, in which a reference signal necessary for stabilizing the servo, an identification signal with other media, and the like are recorded.
Following the lead-in area is a data area. Logically valid data is recorded in this part. Finally, there is a lead-out area where reference signals similar to those in the lead-in area are recorded.

At the beginning of the data area, management information for a file system called volume information is recorded. The description of the file system is omitted because it has no direct relation to the contents of this patent. By passing through the file system,
The data in the disk can be treated as a directory or a file as shown in FIG.

As shown in FIG. 1, all data handled by the DVD recorder is DVD_R directly under the ROOT directory.
It is located under the TR directory. The files handled by the DVD recorder are roughly classified into two types, one management information file and a plurality (at least one) of AV files. The AV file is RTR_MOV.
VRO file and RTR_STO.RTR_STO.R that records a still image and audio data recorded simultaneously with the still image. A VRO file is recorded.

FIG. 2 shows RTR_MOV.
It is a block diagram of a VRO file. As shown in FIG.
TR_MOV. The VRO file includes M_VOB (Movie Vid) which is an MPEG program stream.
eo Object) are arranged in the recording order.

M_VOB is a VOBU (Vid) in which 0.4 second to 1.0 second is defined as one unit based on the video playback time.
eo Object Unit).
VOBU is V_PCK (video pack), A_PCK
(Audio pack) and SP_PCK (sub-picture pack), and each pack is formed in units of 2 KB. The video data in the VOBU includes at least one or more GOPs (Group of Pictures).
res). A GOP is a unit of decoding MPEG video, with an I picture at the beginning.
It is composed of a plurality of P and B pictures.

FIG. 3 shows an example of the RTR_STO. It is a block diagram of a VRO file. As shown in FIG. The VRO file includes an MPEG program stream for a still image, S.
_VOB (Still Picture Video)
Object) are arranged in the order of recording.

The major difference between M_VOB and S_VOB is that, in addition to recording still image data instead of moving image data, moving image data and audio data are not multiplexed with each other, but still image data (Video par)
After t), audio data (Audio part) is subsequently recorded. Also, S_VOB is
It is composed of one VOBU, and the VOBU is V_PC
K, A_PCK and SP_PCK.

(AV Data and Management Information) Next, the relationship between the above-described M_VOB and S_VOB and the management information will be described with reference to FIG.

As already described, there are two types of AV data, M_VOB for moving images and S_VOB for still images. In the M_VOB, management information (M_VOBI) exists for each M_VOB, and the attribute information of the corresponding M_VOB is recorded in the M_VOBI. In the case of S_VOB, if management is performed for each individual S_VOB, the amount of management information increases. Therefore, management information (S_VOGI) exists for each group (S_VOG) in which a plurality of S_VOBs are grouped. In S_VOGI, attribute information of the corresponding S_VOB group is recorded.

What is important here is that there is no linearity between time and data amount in MPEG stream data. As mentioned earlier, in an MPEG stream,
In order to realize highly efficient compression, a compression method using a time correlation characteristic or a compression method using a variable length coding method called VBR is performed, so that time and data amount, that is, address information are unique. Does not correspond to

Therefore, M_VOBI has a filter (TMAP) for converting time and address, and
In VOGI, a filter (S_VOB Entry) for converting a still image number and an address in a group is used.
s).

Next, the management information of the reproduction sequence will be described. The playback sequence is M_VOB, S_VOG
Cell sequence (PG
C).

This playback sequence is composed of all A in the disc.
There are two types: an original PGC that refers to V data, and a user-defined PGC (a plurality of PGCs can be defined) in which the user selects his / her favorite data from the AV data in the disc and defines the playback order.

The former original PGC is also called a program set (Program Set), and a program (Program) in which a plurality of cells are logically bundled.
m). The latter user-defined PG
C is also called a playlist (PlayList),
Unlike the original PGC, it has no Program in between.

(Management Information File) Next, FIGS.
The contents of the management information file "RTR.IFO" will be described with reference to FIG.

"RTR_VMG" (FIG. 5) RTR. In the IFO file, management information called RTR_VMG (real-time recording video management) is recorded. This RTR_VMG is RTR_VMGI, M
_AVFIT, S_AVFIT, ORG_PGCI, U
It is composed of seven tables D_PGCIT, TXTDT_MG, and MNFIT.

Next, the details of each of the above tables will be described. "RTR_VMGI" (FIG. 6) RTR_VMGI (real-time recorded video management information)
Is composed of VMGI_MAT and PL_SRPT.

"VMGI_MAT" (FIG. 6) VMGI_MAT (video management information management table)
The following information is recorded as information on the entire disc. Players and recorders are initially VMGI
By reading _MAT, it is possible to obtain rough configuration information of the disc. VMGI_MAT includes the following information.

VMG_ID (video management identifier) An identifier "DVD_RTR_VMG" indicating that video recording data is recorded on this disc.
0 "is recorded.

RTR_VMG_EA (RTR_VMG end address) The end address of RTR_VMG is recorded.

VMGI_EA (VMGI end address) The end address of VMGI is recorded.

VERN (version number) The version number of the recording format of the video recording data is recorded according to the format shown in FIG.

TM_ZONE (time zone) A time zone used by all date and time information recorded in this disc is recorded. TM_ZONE is Fig. 7
As shown in, TZ_TY (time zone type) indicating whether the standard of the date and time information uses the universal time, Greenwich Mean Time, or the local standard time.
And TZ_OFF to record the time difference from Greenwich Mean Time
SET (time zone offset).

STILL_TM (Still time) The still time length when displaying a still image without sound is recorded.

CHRS (Character Set Code for Primary Text) A character set code for primary text described later is recorded.

M_AVFIT_SA (M_AVFIT start address) The start address of M_AVFIT is recorded. M_
When accessing the AVFIT, seek is performed up to this start address.

S_AVFIT_SA (S_AVFIT start address) The start address of S_AVFIT is recorded. S_
When accessing the AVFIT, seek is performed up to this start address.

ORG_PGCI_SA (ORG_PGC
(I start address) The start address of ORG_PGCI is recorded. O
When accessing RG_PGCI, seek is performed up to this start address.

UD_PGCIT_SA (UD_PGCI
(T start address) The start address of UD_PGCIT is recorded. U
When accessing D_PGCIT, seek is performed up to this start address.

TXTDT_MG_SA (TXTDT_M
G start address) The start address of TXTDT_MG is recorded. T
When accessing XTDT_MG, seek is performed up to this start address.

MNFIT_SA (MNFIT start address) The start address of MNFIT is recorded. MNFI
When accessing T, seek is performed up to this start address.

[PL_SRPT] (FIG. 8) PL_SRPT (playlist search pointer table) is a table composed of PL_SRPTI and n PL_SRPs.

[PL_SRPTI] (FIG. 8) PL_SRPTI (playlist search pointer table information) records the following information for accessing PL_SRP.

PL_SRP_Ns (PL_SRP number) The number of PL_SRP is recorded.

PL_SRPT_EA (PL_SRPT end address) The end address of this PL_SRPT is recorded.

[PL_SRP] (FIG. 8) In addition, PL_SRP (playlist search pointer) contains a user-defined PG which is the actual data of this playlist.
The following information for accessing C is recorded.

PL_TY (Playlist Type) As a value for identifying the type of the play list, one of the following is recorded according to the description format shown in FIG. 0000b: Only movie 0001b: Still image only 0010b: Mixed movie and still image

PGCN (PGC number) A PGC number corresponding to this play list is recorded. The PGC number is a recording order of PGC information in UD_PGCIT described later.

PL_CREATE_TM (Playlist Recording Date and Time) Information on the date and time when this playlist was created is recorded in accordance with the description format shown in FIG.

PRM_TXTI (Primary Text Information) Text information indicating the contents of this play list is recorded. For example, when a television program is recorded, the program name is recorded. Also, this primary text information
It is composed of a field for an ASCII code and a field for a character code set specified by the aforementioned CHRS.

IT_TXT_SRPN (IT_TXT_
(SRP number) In addition to the above-described primary text, when information indicating the content of this playlist is optionally recorded as IT_TXT, I information recorded in TXTDT_MG
IT_TXT_SR as link information to T_TXT
The P number is recorded. The IT_TXT_SRP number is a recording order in TXTDT_MG described later.

THM_PTRI (thumbnail pointer information) Describes thumbnail information representing this play list.

“THM_PTRI” (FIG. 8) In the THM_PTRI, the following information indicating the position of the thumbnail is recorded.

[0107] CN (cell number) A cell number including a thumbnail is recorded. The cell number is the UD_PGCI corresponding to this playlist.
Is the recording order of the cell information in the cell.

THM_PT (Thumbnail Point) When the cell indicated by the CN is a moving image cell, the display time of a video frame used as a thumbnail is recorded according to the PTM description format shown in FIG. PT
M is given according to the reference time of the time stamp described in the MPEG program stream.

When the cell indicated by the CN is a still picture cell, a still picture VOB entry number of a still picture used as a thumbnail is recorded in accordance with the S_VOB_ENTN description format shown in FIG. Still image VO
The B entry number is the recording order of the still image VOB entries in the still image VOB group indicated by this cell.

“M_AVFIT” (FIG. 12) M_AVFIT (moving image AV file information table)
Management information corresponding to the moving image AV file “RTR_MOV.VRO” is recorded, and M_AVFITI, M_VOB
_STI and M_AVFI.

"M_AVFITI" (FIG. 12) M_AVFITI (moving AV file information table information) records the following information necessary for accessing M_VOB_STI and M_AVFI.

M_AVFI_Ns (number of moving image AV file information) Indicates the number of fields of the succeeding AVFI information. "0" indicates that no AVFI exists, and "1" indicates that AVFI exists. ing. Also, A
The presence or absence of VFI is determined by the RTR_
MOV. It corresponds to the presence or absence of VRO.

M_VOB_STI_Ns (M_VOB_
(Number of STIs) The number of fields of the subsequent M_VOB_STI is shown.

M_AVFIT_EA (M_AVFIT end address) The end address of M_AVFIT is recorded.

"M_VOB_STI" (FIG. 12) M_VOB_STI (moving image VOB stream information)
The following information is recorded as stream information of the moving image VOB.

V_ATR (Video Attribute) The following video attribute information is recorded according to the format shown in FIG.

Video compression mode Any one of the following values for identifying a video compression mode is recorded. 00b: MPEG-1 01b: MPEG-2

TV system Any of the following values for identifying the television system is recorded. 00b: 525/60 (NTSC) 01b: 625/50 (PAL)

Aspect ratio One of the following values for identifying the resolution ratio is recorded. 00b: 4x3 01b: 16x9

Line21_switch_1 One of the following values for identifying whether the field 1 closed caption data is recorded in the video stream is recorded. 1b: recorded 0b: not recorded

Line21_switch_2 One of the following values for identifying whether the closed caption data for field 2 is recorded in the video stream is recorded. 1b: recorded 0b: not recorded

Video resolution One of the following values for identifying the video resolution is recorded. 000b: 720x480 (NTSC), 720x576 (PAL) 001b: 702x480 (NTSC), 702x576 (PAL) 010b: 352x480 (NTSC), 352x576 (PAL) 011b: 352x240 (NTSC), 352x28 (48x28) , 544x576 (PAL) 101b: 480x480 (NTSC), 480x576 (PAL)

AST_Ns (the number of audio streams) The number of audio streams recorded in the corresponding VOB is recorded.

SPST_Ns (number of sub-picture streams) The number of sub-picture streams recorded in the corresponding VOB is recorded.

A_ATR0 (attribute of audio stream 0) The following audio attribute information corresponding to audio stream 0 (corresponding to audio stream # 1 described above) is as follows:
It is recorded according to the format of FIG.

Audio coding mode One of the following values for identifying an audio compression method is recorded. 000b: Dolby AC-3 001b: MPEG audio without extension stream 010b: MPEG audio with extension stream 011b: Linear PCM

Application Flag Any one of the following values for identifying application information is recorded. 00b: Not applicable 01b: Mixed number of audio channels 10b: With auxiliary sound

When Quantization / DRC MPEG audio is used, one of the following values for recording the presence / absence of DRC (dynamic range control) information is recorded. 00b: DRC data is not included in MPEG stream 01b: DRC data is included in MPEG stream

Also, when using LPCM audio, Qu
The following values for identifying the activation are recorded. 00b: 16 bits

The following values for identifying the fs sampling frequency are recorded. 00b: 48 kHz

[0111] Number of Audio channels Any one of the following values for identifying the number of audio channels is recorded. 0000b: 1 channel (monaural) 0001b: 2 channels (stereo) 0010b: 3 channels 0011b: 4 channels 0100b: 5 channels 0101b: 6 channels 0110b: 7 channels 0111b: 8 channels 1001b: 2 channels (dual monaural)

Bitrate Any one of the following values for identifying the bit rate is recorded. 0000 0001b: 64kbps 0000 0010b: 89kbps 0000 0011b: 96kbps 0000 0100b: 112kbps 0000 0101b: 128kbps 0000 0110b: 160kbps 0000 0111b: 192kbps 0000 1000b: 224kbps 0000 1001b: 256kbps 0000 1010b: 320kbps 0000 1011b: 384kbps 0000 1100b: 448kbps 0000 1101b : 768 kbps 0000 1110b: 1536 kbps Here, what is important is that when the corresponding audio stream is an MPEG audio stream with an extension stream, the bit rate of the basic stream excluding the extension stream is It is to record. This is because the extended stream is compressed using the variable-length code method, and cannot be represented at the fixed bit rate as described above.

A_ATR1 (attribute of audio stream 1) The following audio attribute information corresponding to audio stream 1 (corresponding to audio stream # 2 provided for dubbing) is recorded in accordance with the format of FIG. Each field is A_AT described above.
Same as R0.

SP_ATR (Sub-Picture Attribute) The following sub-picture attribute information is recorded in accordance with the format shown in FIG.

Application Flag Any one of the following values for identifying application information is recorded. 00b: Not applicable 01b: Subtitle 10b: Animation

SP_PLT (Subpicture Color Palette) Color pallet information for a subpicture is recorded according to the format shown in FIG.

"M_AVFI" (FIG. 15) M_AVFI (moving image AV file information) is information necessary for accessing the moving image VOB, M_AVFI_GI,
It is composed of M_VOBI_SRP and M_VOBI.

"M_AVFI_GI" (FIG. 15) M_AVFI_GI (movie AV file information general information)
Has recorded therein M_VOBI_SRP_Ns.

M_VOBI_SRP_Ns (moving image VOB
(Number of information search pointers) The number of M_VOBI_SRPs is recorded.

"M_VOBI_SRP" (FIG. 15) Address information for accessing each M_VOBI is recorded in M_VOBI_SRP (moving picture VOB information search pointer).

M_VOBI_SA (moving image VOB information start address) M
The start address of _VOBI is recorded, and when accessing the VOB information, a seek may be performed to the address indicated here.

"M_VOBI" (FIG. 16) M_VOBI (moving picture VOB information) is management information of moving picture VOB, M_VOB_GI, SMLI, AGAPI, TM
It is composed of API and CP_MNGI.

"M_VOB_GI" (FIG. 16) M_VOB_GI (moving picture VOB general information) includes moving picture V
The following information is recorded as OB general information.

VOB_TY (VOB type) VOB attribute information is recorded according to the format shown in FIG.

TE Any one of the following values for identifying the state of this VOB is recorded. 0b: Normal state 1b: Temporary erase state

A0_STATUS One of the following values for identifying the state of audio stream 0 is recorded. 00b: Original state 01b: Rewritten state Here, the “original state” indicates that the state in which data is first written in the audio stream 0 is the same, and the “rewritten state” is This shows a state in which the original data has been rewritten.

A1_STATUS One of the following values for identifying the state of the audio stream 1 is recorded. 00b: Original state 01b: Rewritten state 10b: Dubbed state for dubbing 11b: Dubbed state Here, the “dummy state for dubbing” means that after-recording data is still recorded when audio stream 1 is provided for dubbing. The “recorded state” indicates a state in which the post-record data has been rewritten. In some cases, the audio stream 1 is provided on the premise that it is not used for post-recording. Therefore, the “original state” and the “rewritten state” are also defined.

One of the following values for identifying the APS analog copy protection signal control information is recorded. 00b: No APS 01b: Type 1 10b: Type 2 11b: Type 3

SML_FLG Any one of the following values for identifying whether this VOB is seamlessly reproduced with the immediately preceding VOB is recorded. 0b: Seamless playback disabled 1b: Seamless playback enabled

A0_GAP_LOC The presence or absence of an audio playback gap in audio stream 0 and one of the following values indicating the VOBU in which the audio playback gap section is multiplexed are recorded. 00b: No audio reproduction gap 01b: Audio reproduction gap is multiplexed in the first VOBU 10b: Audio reproduction gap is multiplexed in the second VOBU 11b: Audio reproduction gap is multiplexed in the third VOBU

A1_GAP_LOC The presence or absence of an audio reproduction gap in the audio stream 1 and one of the following values indicating the VOBU in which the audio reproduction gap section is multiplexed are recorded. 00b: No audio reproduction gap 01b: Audio reproduction gap is multiplexed in the first VOBU 10b: Audio reproduction gap is multiplexed in the second VOBU 11b: Audio reproduction gap is multiplexed in the third VOBU

VOB_REC_TM (VOB recording date and time) The date and time when this VOB was recorded is the PL_CRE shown in FIG.
It is recorded in the same format as ATE_TM. What is important here is that the recording date and time indicates the recording date and time of the display video frame at the beginning of the VOB. If the video frame at the beginning of the VOB changes due to editing or partial erasing, this VOB_REC_TM must also be corrected. It is. In addition, when it is desired to display the recording date and time in synchronization with the reproduction of the VOB, as often seen in a camcorder, the recording time can be obtained by adding the elapsed time in the VOB to VOB_REC_TM.

VOB_REC_TM_SUB (VOB recording date / time difference information) VOB_REC_ which is modified when the VOB first video frame is replaced by editing or partial erasing of the VOB
This is a field for absorbing a TM error. VOB
As shown in FIG. 9, since _REC_TM has only information up to the date, month, day, hour, minute, and second, when editing or erasing with frame or field accuracy, VOB_REC is used.
Since sufficient recording accuracy cannot be obtained with only _TM, a fraction is recorded using this field.

M_VOB_STIN (M_VOB_ST
(I number) The M_VOB_STI number corresponding to this VOB is recorded. The M_VOB # STI number shown here is
This is the recording order in the above-described M_VOB_STI table.

VOB_V_S_PTM (VOB video start PTM) The display start time of this VOB is recorded at the same reference time as the time stamp in the stream.

VOB_V_E_PTM (VOB video end PTM) The display end time of this VOB is recorded at the same reference time as the time stamp in the stream. Please note that
The time stamp in the stream indicates the display start time of the frame, but in VOB_V_E_PTM,
The display end time, that is, the time obtained by adding the display period of the frame to the display start time is recorded.

"SMLI" (FIG. 16) The SMLI (seamless information) records the following information necessary for seamless reproduction with the immediately preceding VOB. Also, this field is the same as the SML_F described above.
It exists only when “1b” is recorded in LG.

VOB_FIRST_SCR (VOB head SCR) The SCR of the first pack of the VOB is recorded.

PREV_VOB_LAST_SCR (previous VOB final SCR) The SCR of the last VOB last pack is recorded.

"AGAPI" (FIG. 16) The following information necessary for processing the audio reproduction gap by the decoder is recorded in the AGAPI (audio gap information). Also, this field is used for A0_GAP_LOC or A1_GAP_LO described above.
It exists when a value other than “00b” is recorded in any of C.

VOB_A_STP_PTM (VOB audio stop PTM) The audio reproduction gap, that is, the time when the decoder temporarily stops the audio reproduction, is recorded at the same reference time as the time stamp in the stream.

VOB_A_GAP_LEN (VOB audio gap length) The time length of the audio reproduction gap is recorded with an accuracy of 90 kHz.

"CP_MNGI" (FIG. 16) CP_MNGI (copy management information) is copy management information for this VOB, CPG_STATUS and CPGI.
It is composed of

CPG_STATUS (copy protection state) As the VOB copy protection state, a value for identifying “copy free” or “one generation copy” is recorded.

CPGI (copy protection information) Records copy protection information applied to the VOB.

“TMAPI” (FIG. 18) TMPAI (time map information) is TMAP_GI,
It is composed of TM_ENT and VOBU_ENT.

"TMAP_GI" (FIG. 18) TMAP_GI (TMAP general information) is TM_ENT.
_Ns, VOBU_ENT_Ns, TM_OFS, AD
It consists of R_OFS, and each field is as follows.

TM_ENT_Ns (TM_ENT number) The number of TM_ENT fields described later is recorded.

VOBU_ENT_Ns (VOBU_EN_Ns)
(Number of T) The number of fields of VOBU_ENT described later is recorded.

TM_OFS (Time Offset) The offset value of the time map is recorded with video field accuracy.

ADR_OFS (Address Offset) An offset value in the AV file at the head of the VOB is recorded.

"TM_ENT" (FIG. 18) TM_ENT (time entry) is composed of the following fields as access point information for each fixed interval TMU. The TMU is 600 video fields (NTSC) for NTSC and 500 video fields for PAL.

VOBU_ENTN (VOBU_ENT number) A VO including the time indicated by this TM_ENT (in the case of the Nth TM_ENT, TMUx (N−1) + TM_OFS)
The BU entry number is recorded.

TM_DIFF (time difference) The time indicated by TM_ENT and VOBU_EN described above
The difference of the display start time of the VOBU indicated by the TN is recorded.

VOBU_ADR (VOBU address) The head address of the VOBU indicated by VOBU_ENTN in the VOB is recorded.

"VOBU_ENT" (FIG. 19) In the VOBU_ENT (VOBU entry), the following configuration information of the corresponding VOBU is recorded in the format shown in FIG. By sequentially adding subsequent fields, it is possible to obtain time and address information necessary for accessing a desired VOBU.

1STREF_SZ The number of packs from the VOBU head pack to the pack including the last data of the head I picture in the VOBU is recorded.

VOBU_PB_TM The playback time length of this VOBU is recorded.

VOBU_SZ The data amount of this VOBU is recorded.

"S_AVFIT" (FIG. 20) S_AVFIT (still image AV file information table)
Records management information corresponding to a still image AV file “RTR_STO.VRO”, and includes S_AVFITI, S_
It is composed of VOB_STI and S_AVFI.

“S_AVFITI” (FIG. 20) S_AVFITI (still image AV file information table information) records the following information necessary for accessing S_VOB_STI and S_AVFI.

S_AVFI_Ns (Number of Still Image AV File Information) “0” or “1” is recorded as the number of S_AVFI. This value is the number of still image AV files, that is, RT
R_STO. It also supports the presence or absence of a VRO file.

S_VOB_STI_Ns (still image VOB
(Number of stream information) The number of S_VOB_STI described later is recorded.

S_AVFI_EA (End Address of Still Image AV File Information) The end address of S_AVFI is recorded.

"S_VOB_STI" (FIG. 20) S_VOB_STI (still picture VOB stream information)
The following information is recorded as stream information of a still image VOB.

V_ATR (Video Attribute) As the video attribute information, Video compress
ion mode, TV system, Aspect
The ratio and the video resolution are recorded. Each field is M_VOB described above.
Same as V_ATR in _STI.

OA_ATR (Audio Stream Attribute) As audio stream attribute information, Audio c
odding mode, Application Fl
ag, Quantization / DRC, fs, Nu
mber of Audio channels is recorded. Each field is M_VOB_
Same as A_ATR0 in STI.

SP_ATR (Sub-Picture Attribute) As sub-picture attribute information, Application
Flag is recorded. This field is the same as SP_ATR in M_VOB_STI described above.

SP_PLT (Subpicture Color Palette) The subpicture color palette information is recorded. The recording format is M_VOB_STI described above.
And SP_PLT.

“S_AVFI” (FIG. 23) S_AVFI (still picture AV file information)
Information required to access OG, S_AVFI_
GI, S_VOGI_SRP, and S_VOGI.

“S_AVFI_GI” (FIG. 23) S_VOGI_SRP_Ns is recorded in S_AVFI_GI (still picture AV file information general information).

S_VOGI_SRP_Ns (still image VO
(Number of B group search pointers) The number of fields of S_VOGI_SRP described later is recorded.

“S_VOGI_SRP” (FIG. 23) S_VOGI_SRP (S_VOGI_SA is recorded in the still image VOB group information search pointer.

[0174] In S_VOGI_SA (still picture VOB group information start address), the start address of this S_VOGI is recorded.

"S_VOGI" (FIG. 23) S_VOGI (still picture VOB group information) is management information of a still picture VOB, S_VOG_GI, S_VOB_E.
NT and CP_MNGI.

“S_VOG_GI” (FIG. 23) In S_VOG_GI (still picture VOB group general information), the following information is recorded as general information of the still picture VOB group.

S_VOB_Ns (number of still picture VOBs) The number of still picture VOBs in the still picture VOB group is recorded.

S_VOB_STIN (S_VOB_ST
S_V in which stream information of the still image VOB is recorded
The OB_STI number is recorded. S_VOB_ST
The I number is the recording order in the above-described S_VOB_STI table.

FIRST_VOB_REC_TM (head VOB recording date / time) Recording date / time information of the head still image VOB in this still image VOB group is recorded.

LAST_VOB_REC_TM (final V
(OB recording date and time) Recording date and time information of the last still image VOB in this still image VOB group is recorded.

S_VOB_SA (still picture VOB group start address) RTR_STO. The start address of the still image VOB group in the VRO file is recorded.

"CP_MNGI" CP_MNGI (copy management information) is
Copy management information on group B is recorded.
Each field is CP_M of M_VOBI described above.
Same as NGI.

"S_VOB_ENT" (FIG. 24) S_VOB_ENT (still picture VOB entry) corresponds to each still picture VOB in the still picture VOB group, and is divided into the following types A and B depending on the presence or absence of audio.

[S_VOB_ENT (Type A)]
(FIG. 24) Type A is S_VOB_ENT_TY, V_PART
_SZ, and the individual fields are as follows.

S_VOB_ENT_TY (still image VOB
Entry Type) The type information of the still image VOB is recorded in the format shown in FIG.

MAP_TY One of the following values for identifying type A or type B is recorded. 00b: Type A 01b: Type B

TE Any one of the following values for identifying the state of the still picture VOB is recorded. 0b: Normal state 1b: Temporary erase state

SPST_Ns The number of sub-picture streams in the still picture VOB is recorded.

V_PART_SZ (video part size) The data amount of the still picture VOB is recorded. “S_VOB_ENT (Type B)” (FIG. 24) Type B is S_VOB_ENT_TY, V_PART
_SZ, A_PART_SZ, A_PB_TM
And the individual fields are as follows:

S_VOB_ENT_TY (still image VOB
Entry type) Type information of this still image VOB is recorded. Each field is the same as the type A described above.

V_PART_SZ (video part size) The data amount of the video part in the still image VOB is recorded.

A_PART_SZ (Audio Part Size) The data amount of the audio part in the still picture VOB is recorded.

A_PB_TM (audio reproduction time) The reproduction time length of the audio part in the still picture VOB is recorded.

"UD_PGCIT" (FIG. 26) UD_PGCIT (user-defined PGC information table)
Are UD_PGCITI, UD_PGCI_SRP, U
D_PGCI.

"UD_PGCITI" (FIG. 26) UD_PGCITI (user-defined PGC information table information) records the following information constituting the user-defined PGC information table.

UD_PGCI_SRP_Ns (number of user-defined PGC information search pointers) The number of UD_PGCI_SRP is recorded.

UD_PGCIT_EA (user-defined PG
C information table end address) The end address of UD_PGCIT is recorded.

[UD_PGCI_SRP] (FIG. 26) UD_PGCI_SA is recorded in UD_PGCI_SRP (user-defined PGC information search pointer).

UD_PGCI_SA (User-defined PGC
(Information start address) In UD_PGCI_SA, the start address of UD_PGCI is recorded. When accessing this PGCI,
It is only necessary to seek to the recorded address.

"UD_PGCI" (FIG. 26) The details of UD_PGCI (user-defined PGC information) will be described later in PGCI.

"O_PGCI" (FIG. 5) The details of O_PGCI (original PGC information) will be described later in PGCI.

“TXTDT_MG” (FIG. 27) TXTDT_MG (text data management) is a TXTD
It is composed of TI, IT_TXT_SRP, and IT_TXT. The individual fields are as follows.

"TXTDTI" (FIG. 27) TXTDTI (text data information)
It is composed of T_TXT_SRP_Ns and TXTDT_MG_EA.

CHRS (Character Set Code) A character set code used in IT_TXT is recorded.

IT_TXT_SRP_Ns (IT_TXT
(Number of T search pointers) The number of IT_TXT_SRP is recorded.

TXTDT_MG_EA (Text Data Management End Address) The end address of TXTDT_MG is recorded.

"IT_TXT_SRP" (FIG. 27) IT_TXT_SRP (IT_TXT search pointer)
, The following information is recorded as access information to the corresponding IT_TXT.

IT_TXT_SA (IT_TXT start address) The start address of IT_TXT is recorded. This I
When accessing T_TXT, it is sufficient to seek to this address.

IT_TXT_SZ (IT_TXT size) The data size of IT_TXT is recorded. This I
When it is desired to read T_TXT, it is sufficient to read data of this size.

"IT_TXT" (FIG. 27) IT_TXT is IDCD (identification code), TXT (text) and TMCD (end code) corresponding to IDCD.
Are set as one set, and a plurality or one set is constituted. When there is no TXT corresponding to the IDCD, the IDCD and the TMCD may be omitted and one set may be omitted. Also,
The IDCD is defined as follows. Genre code 30h: Movie 31h: Music 32h: Drama 33h: Animation 34h: Sports 35h: Documentary 36h: News 37h: Weather 38h: Education 39h: Hobbies 3Ah: Entertainment 3Bh: Arts (drama, opera) 3Ch Source code: 3Ch : Broadcasting station 61h: Camcorder 62h: Photo 63h: Memo 64h: Other

"PGCI" (FIG. 28) PGCI (PGC information) is O_PGCI, UD_PG
CI has a common data structure, and PGC_GI, PG
I, CI_SRP, and CI.

“PGC_GI” (FIG. 28) PGC_GI (PGC general information) is composed of PG_Ns and CI_SRP_Ns as general PGC information. The individual fields are as follows.

PG_Ns (number of programs) The number of programs in this PGC is recorded. In the case of a user-defined PGC, since no program can be provided, “0” is recorded in this field.

CI_SRP_Ns (CI_SRP number) The number of CI_SRPs described later is recorded.

"PGI" (FIG. 28) PGI (program information) includes PG_TY, C_Ns,
PRM_TXTI, IT_TXT_SRPN, THM_
It consists of PTRI. The individual fields are as follows.

PG_TY (program type) The following information indicating the status of this program is recorded using the format shown in FIG. Protect (Protect) 0b: Normal state 1b: Protected state C_Ns (number of cells) The number of cells in this program is described.

PRM_TXTI (Primary Text Information) Text information indicating the contents of this program is recorded. Details are the same as the above-described PL_SRPT.

The IT_TXT_SRPN (IT_TXT_
(SRP Number) In addition to the above-described primary text, when information indicating the contents of this program is optionally recorded as IT_TXT, the number of IT_TXT_SRP recorded in TXTDT_MG is recorded in this field.

THM_PTRI (thumbnail pointer information) Thumbnail information representing this program is described. For details of THM_PTRI, refer to the above-described PL_SR
Same as THM_PTRI of PT.

"CI_SRP" (FIG. 28) CI_SRP (cell information search pointer) records address information for accessing the cell information.

CI_SA (Cell Information Start Address) The start address of this cell information is recorded. When accessing this cell, it is sufficient to seek to this address.

“CI” (FIG. 30) The CI (cell information) includes M_CI for a moving image and S_C for a still image.
_CI.

“M_CI” (FIG. 30) M_CI (moving picture cell information) includes M_C_GI, M_C_
It consists of EPI.

“M_C_GI” (FIG. 30) M_C_GI (moving picture cell general information) has the following basic information constituting a cell.

C_TY (cell type) The following information for identifying a moving image cell and a still image cell is recorded in the format shown in FIG.

C_TY1 000b: Moving picture cell 001b: Still picture cell

M_VOBI_SRPN (moving picture VOB information search pointer number) Search pointer number of moving picture VOB information corresponding to this cell is recorded. When accessing the stream data corresponding to this cell, first, the video VOB information search pointer number indicated by this field is accessed.

C_EPI_Ns (number of cell entry point information) The number of entry points existing in this cell is recorded.

C_V_S_PTM (Cell Video Start Time) The reproduction start time of this cell is recorded in the format shown in FIG.

C_V_E_PTM (cell video end time) The playback end time of this cell is recorded in the format shown in FIG. C_V_S_PTM and C_V_E_P
The valid section of the cell in the VOB to which this cell corresponds is specified using TM.

“M_C_EPI” (FIG. 32) M_C_EPI (moving picture cell entry point information)
It is classified into type A and type B depending on the presence or absence of the primary text.

“M_C_EPI (Type A)” (FIG. 3
2) M_C_EPI (type A) is composed of the following information indicating an entry point.

EP_TY (Entry Point Type) The following information for identifying the type of this entry point is recorded according to the format shown in FIG. EP_TY1 00b: Type A 01b: Type B

EP_PTM (Entry Point Time) The time at which the entry point is placed is recorded according to the format shown in FIG.

"M_C_EPI (Type B)" (FIG. 3
2) M_C_EPI (type B) is an EP of type A
_TY, EP_PTM, and PRM_TX described below
Has a TI.

PRM_TXTI (Primary Text Information) Text information indicating the contents of the location indicated by this entry point is recorded. See PL_SRP for details.
Same as T.

“S_CI” (FIG. 30) S_CI (still picture cell information) is S_C_GI, S_C
_EPI.

“S_C_GI” (FIG. 30) S_C_GI (still picture cell general information) has the following basic information that constitutes a cell.

C_TY (cell type) Information for identifying a moving image cell and a still image cell is recorded. The details are as described in the moving image cell.

S_VOGI_SRPN (still picture VOB group information search pointer number) A search pointer number of the still picture VOB group information corresponding to this cell is recorded. When this cell accesses the corresponding stream data, first, the still image VOB indicated by this field
Access the group information search pointer number.

C_EPI_Ns (number of cell entry point information) The number of entry points existing in this cell is recorded.

S_S_VOB_ENTN (Start still picture V
(OB number) The reproduction start still image VOB number of this cell is recorded in the format shown in FIG. The still image VOB number is an order in the S_VOG indicated by the above-described S_VOGI_SRPN.

E_S_VOB_ENTN (End still picture V
(OB number) The reproduction end still image VOB number of this cell is recorded in the format shown in FIG. The still image VOB number is an order in the S_VOG indicated by the above-described S_VOGI_SRPN. Note that S_S_VOB_ENTN and E_S
_VOB_ENTN, the corresponding S_
The valid section of the cell in the VOG is specified.

“S_C_EPI” (FIG. 32) S_C_EPI (still picture cell entry point information)
Are classified into type A and type B depending on the presence or absence of a primary text.

"S_C_EPI (Type A)" (FIG. 3
2) S_C_EPI (type A) includes the following information indicating an entry point.

EP_TY (Entry Point Type) The following information for identifying the type of the entry point is recorded according to the format shown in FIG.

EP_TY1 00b: Type A 01b: Type B S_VOB_ENTN (still image VOB entry number) The still image number where the entry point is located is shown in FIG.
Recorded in accordance with the format shown in FIG.

"S_C_EPI (Type B)" (FIG. 3
2) S_C_EPI (type B) is an EP of type A
_TY, S_VOB_ENTN, PR described below
M_TXTI.

PRM_TXTI (Primary Text Information) Text information indicating the contents of the location indicated by this entry point is recorded. See PL_SRP for details.
Same as T.

(Recording Date and Time Information) Next, a method of calculating recording date and time information displayed on the menu screen and the reproduction display screen will be described with reference to the above-described data structure.

As described above, the recording date and time information is M_VO.
VOB_REC_ in B_GI (moving image VOB general information)
It is stored in TM (VOB recording date and time). That is, V
The time indicated by OB_REC_TM is the time when the corresponding VO
This is information indicating the date and time when the first frame of B (according to the display order) was recorded. That is, the recording date and time information of each frame in the VOB is set to the value (VOB_REC_TM value)
It can be obtained by adding the elapsed time in B.

FIG. 42 is a diagram showing a display example of recording date and time information on the menu screen. As mentioned above, DVD-R
In the AM, a program or a play list is provided on a physically recorded AV data as a logical reproduction sequence that the user is conscious of. That is, what the DVD recorder displays as a menu screen is not a program list based on VOB, but a program list and recording date and time information based on programs and playlists.

Since the recording date and time information is managed for each VOB, the DVD recorder obtains the elapsed time in the VOB and adds this to VOB_REC_TM in order to obtain the recording date and time information at the beginning of each program and each playlist. There is a need to. The elapsed time in the VOB of the first frame of the program and the playlist can be obtained using the following equation.

Elapsed time = C_V_S_PTM−VOB_V_S_PTM (1) Here, C_V_S_PTM is reproduction start time information of the head Cell of the program or the playlist. VOB_REC_TM, which is the recording date and time information of the VOB corresponding to the Cell, is calculated from the elapsed time obtained by equation (1).
, The recording date and time information of the program or the playlist is obtained.

Next, a display example of recording date and time information on the reproduction display screen will be described with reference to FIG. The recording date and time information on the playback display screen must further consider the time elapsed by the playback. As described above, since the elapsed time from the head of the VOB to the head of the cell can be obtained by equation (1), the elapsed time from the head of the cell ("Telapse" in the figure) is counted during playback. I should go.

(Configuration of DVD Recorder) The configuration of the DVD recorder will be described with reference to FIG. As shown in the figure, the DVD recorder has a user interface unit 780 for displaying to a user and receiving a request from the user.
1. System control unit 7802 that has a clock and manages and controls the entire system, input unit 7803 for inputting video and audio such as an AD converter, and encoder unit 780
4. Output unit 7805 for outputting video and audio, MPE
A decoder unit 7806 for decoding the G stream, a track buffer 7807, and a drive 7808 are provided.

(Recording Operation of DVD Recorder) The recording operation of the DVD recorder configured as described above will be described. When a program recording request from the user is notified from the user interface unit 7801 to the system control unit 7802, the system control unit 7802 sets the encoder unit 78
04 is notified of an encoding start request.

[0258] The encoder section 7804 includes an input section 7803.
The video and audio data sent from the VCR are video-encoded and audio-encoded, respectively, to multiplex AV data, and to supply data to the track buffer 7807 as an MPEG system stream (VOB) shown in FIG.

At the same time, the system control unit 7802 issues a write request to the DVD-RAM to the drive 7808, and the drive 7808
7 is taken out and written into the DVD-RAM. Also, the system control unit 7802
At the same time as the start of recording, date and time information is extracted from a clock provided therein and temporarily stored in an internal memory.

When a program recording stop request from a user or a recording end time set by the user comes, a user interface unit 7801 notifies the system control unit 7802 of a recording stop request.

[0261] The system control unit 7802 notifies the encoder unit 7804 of a recording stop request, and the encoder unit 7804 stops the encoding process. The encoder unit 7804 returns the size of each VOBU, the playback time length, and the number-of-packs information including the first I picture to the system control unit 7802 at the same time as the end of the encoding process.
The system control unit 7802 generates a time map based on the VOBU information received from the encoder unit 7804.

Next, the system control unit 7802 notifies the drive 7808 of a write stop request. When the writing of the data remaining in the track buffer 7807 to the DVD-RAM ends, the drive 7808 ends the writing process and notifies the system control unit 7802 of the end.

Encoder 7804 and drive 78
When the processing in step 08 is completed, the system control unit 7802
Generates management information VOBI of the recorded VOB,
Register in AVFIT (moving image AV file information table). The corresponding PGI (program information) and M
_CI (moving image cell information) is generated, and ORG_PGCI
(Original PGC information). Also, the system control unit 7802 stores the date and time information extracted at the start of recording and stored in the internal memory in M_VOBI (moving picture V
OB information) is recorded as recording date and time information in VOB_REC_TM of the VOB.

(Playback Operation of DVD Recorder)
The reproduction operation in the D recorder will be described. User is D
When the VD-RAM is inserted into the drive 7808, the drive 7808 sends a DVD
Notify that RAM has been inserted. The system control unit 7802 controls the DVD-RAM through the drive 7808
Is read out and stored in the internal memory.

Next, the system control unit 7802 determines whether the DVD-
The program information recorded in the RAM is displayed as a menu on the screen through the user interface unit 7801 to notify the user. As shown in FIG. 42, the menu includes a program number or playlist number, and recording date and time information of the program or playlist. That is,
The recording date and time information is obtained by calculating the elapsed time in the VOB as described above and adding this to VOB_REC_TM.

The user selects a program to be viewed from the menu, instructs the user interface unit 7801, and is notified to the system control unit 7802 through the user interface unit 7801.

The system control unit 7802 obtains the reproduction start address from the head M_CI (moving picture cell information) of the program or playlist designated by the user and the M_VOBI (moving picture VOB information) corresponding to this cell, and uses the AV from this address. It requests the drive 7808 to read data. Upon request, drive 7808
Reads data from a specified address on the DVD-RAM and stores it in the track buffer 7807.

The system control unit 7802 issues a decoding start request to the decoder unit 7806,
806 fetches the data stored in the track buffer 7807, performs decoding processing, and outputs
Video and audio are reproduced through the.

In the system control unit 7802, FIG.
As described in Section 3, the reproduction elapsed time of each frame to be counted up (Telaps
e) is added, the recording date / time information of each frame is obtained, and this is notified to the decoder unit 7806. Decoder section 780
In step 6, the received recording date and time information is combined with the decoded video data and output to the display device via the output unit 7805.

(Editing of VOB Data) Next, a case where editing of VOB data has occurred will be described. As described with reference to FIG. 16, the VOB recording date and time information VOB_REC_TM
Has information of year, month, day, hour, minute, and second. VOB recording,
As long as playback and erasing in VOB units are repeated,
Although there is no problem, the following problem occurs when erasing a partial section in the VOB.

For example, if data for 10 seconds and 58 fields (29 frames) from the beginning of the VOB is erased, VOB_REC_TM must add 58 seconds for 10 seconds due to the nature of the recording date and time of the first frame of the VOB. Must. At this time, since VOB_REC_TM cannot be recorded with frame (or field) accuracy, only 10 seconds are added to VOB_REC_TM. The original VOB_REC_TM is "0
If it is 09:00:00 on March 01, VOB
VOB_REC_TM after execution of the partial erase of “199” is “199
"09:00:00" on March 01, 1997, and an error of 58 fields (29 frames) is generated. This error is accumulated as the partial erasure process is repeated.
For example, if the above-described partial erasure of 58 fields (29 frames) of 10 seconds is performed 100 times, 100 × 5
An error of 8 fields = 5800 fields (about 96 seconds) is accumulated.

Therefore, in this embodiment, M_VOBI
VOB_REC_TM_SUB in (Movie VOB information)
In the (VOB recording date / time difference information) field, an error of less than one second caused by editing is recorded.

That is, when partial erasure is performed from the beginning of the VOB, the following relationship is established before and after the partial erasure. VOB_REC_TM before partial erase + VOB_REC_TM_SUB before partial erase-partial erase time length = VOB_REC_TM after partial erase + VOB_REC_TM_SUB after partial erase (2)

For example, as shown in FIG.
OB_REC_TM is “09 March 01, 1999
00:00:00 ”and the VOB partial erase time length is 1
In the case of 0 seconds and 58 fields (29 frames), the VOB_REC_TM after the partial erasure contains “1999/03”.
00:00:10 on the first day of the month is stored, and VOB_R
58 fields (29 frames) are stored in EC_TM_SUB.

It should be noted that error information may be recorded in VOB_REC_TM_SUB in frame units or time stamps instead of field units.

(Operation at the time of partial erasure) The operation at the time of partial erasure of the DVD recorder will be described in detail with reference to the flowcharts of FIGS.

As shown in FIG. 46, an instruction for partial deletion is input from the user via the user interface unit 7801 (S11). The instruction from the user includes an erasing start position, an erasing time, and the like. According to the instruction, it is determined whether or not the end of the VOB is included in the erased portion (S12).

When the end of the VOB is included in the erased portion, that is, in the case as shown in FIG.
VOB rear part erasure processing (details will be described later) is performed (S
13).

If the end of the VOB is not included in the erased portion, it is determined whether or not the beginning of the VOB is included in the erased portion (S14). When the beginning of the VOB is included in the erased portion, that is, in the case as shown in FIG. 49A, a VOB front portion erasing process (details will be described later) is performed (S15).

When the beginning of the VOB is not included in the erased portion, that is, in the case as shown in FIG. 49B, the corresponding VOBI is copied (S17). Here, in the case shown in FIG. 49B, the VOBI is copied because the VOB is divided into two by the partial erasure, and is used for one VOB newly generated by the partial erasure. In order to obtain a VOBI. Then, VOB is applied to the rear VOB generated by the partial erase.
A front portion erasing process is performed (S18), and a VOB rear portion erasing process is performed on the front VOB generated by the partial erasing (S19).

After the VOB front erasing process and / or the VOB rear erasing process are performed, the actual VOB data is erased in the erasing section (S1).
6).

The VOB rear portion erasing process in steps S13 and S19 is performed as follows. FIG.
7, the VOB display end time (VOB_V_E_
The erasing time (Tdelete) is subtracted from the PTM (S13).
1). Here, in the case shown in FIG.
As the erasing time (Tdelete), T "delete, which is the time measured from the end of the VOB before erasing, is used. Thereafter, the time map corresponding to the erasing time (Tdelete) is deleted from the rear (S132). For details of the map erasing operation, see, for example, European Patent Application No. EP090
No. 3738.

[0283] The VOB front part erasing process in steps S15 and S18 is performed as follows. FIG.
8, the VOB display start time (VOB_V_S_
Add the erasing time (Tdelete) to the PTM) (S15)
1). Here, in the case shown in FIG.
As the erase time (Tdelete), T'delete, which is the time measured from the beginning of the VOB before erasure, is used. After that, the recording time is edited (S152 to S156).

Specifically, VOB_REC_TM_SU
A remainder obtained by dividing Tdelete by 60 fields (= 1 second) is added to B (S152). V after addition
When the value of OB_REC_TM_SUB is 60 fields (=
(1 second) or more is determined (S153). V after addition
If the value of OB_REC_TM_SUB is 60 fields or more, the value of VOB_REC_TM_SUB is 60
The field is subtracted (S154), and VOB_REC_T
One second is added to the value of M (S155). Thus, VO
By rounding up the value of B_REC_TM_SUB every 60 fields, VOB_REC_TM_SUB stores an error of less than 1 second of the recording start time. Thereafter, the value when the erasing time (Tdelete) is indicated in hours, minutes, and seconds is added to VOB_REC_TM (S156).
Finally, the time map corresponding to the deletion section is deleted from the front (S157). In the above description, one second is treated as 60 fields. However, the number of fields per second depends on the television system, and this example deals with the case of the NTSC of the television system used in Japan and the United States. In the case of PAL used in Europe, one second is 5
There are 0 fields.

As described above, the DVD-R according to the present invention
Since the AM has the recording date and time information in the management information for the video data, it is possible to display the menu at the time of reproduction by referring to the recording date and time information. In addition, since error information is included in addition to the recording date and time information, the recording date and time information can be accurately corrected even when an editing process such as partial deletion is performed.

In this embodiment, the DVD-R
Although described as a recorder for AM, the present invention relates to a DV recorder.
The invention is not limited to the D-RAM, but can be applied to any rewritable disc.

[0287] In this embodiment, the recording date and time for displaying the menu is the recording date and time of the head of the program, ie, the head video frame of the head Cell. However, an arbitrary video frame determined in advance such as 10 seconds after the head is displayed. May be recorded.

In this embodiment, the recording date and time information to be displayed during reproduction is represented by the elapsed time from the beginning of the cell as C.
was added to the recording date and time information at the top of the cell, but M_V
VOBU recorded in OBI (moving image VOB information)
It is also possible to first calculate the recording date and time information at the beginning of each VOBU based on _ENT (VOBU entry) and add the elapsed time in the VOBU to this.

In addition, the recording date and time information displayed during reproduction is stopped from being displayed with frame precision, and the VOBU_
It may be displayed only at the time obtained from the calculation by ENT.

[0290]

According to the present invention, the information recording medium has the recording date and time information in the management information for the video data, and the menu at the time of reproduction can be displayed at high speed by referring to the recording date and time information. Becomes possible. In addition, by having an error information field in addition to the recording date and time information, it is possible to accurately correct the recording date and time information even when editing processing such as partial erasure is performed.

[Brief description of the drawings]

FIG. 1 is a logical configuration diagram of a disk according to a second embodiment.

FIG. 2 is a configuration diagram in a moving image AV file.

FIG. 3 is a configuration diagram in a still image AV file.

FIG. 4 is a diagram showing the relationship between AV data and management information.

FIG. 5 is an RTR_VMG configuration diagram.

FIG. 6 is an RTR_VMGI configuration diagram.

FIG. 7 is a format explanatory diagram of VERN and TM_ZONE.

FIG. 8 is a block diagram of a PL_SRP.

FIG. 9 is a format explanatory diagram of PL_TY and PL_CREATE.

FIG. 10 is an explanatory diagram of a PTM recording format.

FIG. 11 is an explanatory diagram of an S_VOB_ENTN recording format.

FIG. 12 is an M_AVFIT configuration diagram.

FIG. 13 is an explanatory diagram of a V_ATR and A_ATR format.

FIG. 14 is an explanatory diagram of a SP_ATR and SP_PLT format for a moving image.

FIG. 15 is an M_AVFI configuration diagram.

FIG. 16 is an M_VOBI configuration diagram.

FIG. 17 is an explanatory diagram of a VOB_TY format.

FIG. 18 is a TMAPI configuration diagram.

FIG. 19 is an explanatory diagram of a VOBU_ENT format.

FIG. 20 is an S_AVFIT configuration diagram.

FIG. 21 is an explanatory diagram of V_ATR and OA_ATR formats.

FIG. 22: SP_ATR and SP_PLT for still images
Format explanatory drawing.

FIG. 23 is an S_AVFI configuration diagram.

FIG. 24 is a configuration diagram of S_VOB_ENT.

FIG. 25 is an explanatory diagram of an S_VOB_ENT_TY format.

FIG. 26 is a UD_PGCIT configuration diagram.

FIG. 27 is a configuration diagram of TXTDT_MG.

FIG. 28 is a PGCI configuration diagram.

FIG. 29 is an explanatory diagram of a PG_TY format.

FIG. 30 is a CI configuration diagram.

FIG. 31 is an explanatory diagram of a C_TY format.

FIG. 32 is a C_EPI configuration diagram.

FIG. 33 is an explanatory diagram of an EP_TY1 format.

FIG. 34 is a block diagram of a drive device of the DVD recorder.

FIG. 35 is an explanatory diagram of an address space on a disk and an amount of data stored in a track buffer.

FIG. 36 is a picture correlation diagram in an MPEG video stream.

FIG. 37 is a configuration diagram of an MPEG system stream.

FIG. 38: MPEG system decoder (P-STD)
FIG.

FIG. 39 is a diagram for explaining the multiplexing of the MPEG stream, and shows the correspondence among (a) video data, (b) video buffer, (c) MPEG system stream, and (d) audio data.

FIG. 40 is a diagram showing a band configuration on a video tape and a display example of a time code recorded on the tape.

FIG. 41 is a view for explaining a menu generation method from stream data.

FIG. 42 is a view for explaining a menu generation method based on management information.

FIG. 43 is an exemplary view for explaining a method of generating recording date / time information during reproduction;

FIG. 44 is a configuration diagram of a DVD recorder.

FIG. 45 is a view for explaining a method of correcting recording date and time information at the time of editing video data.

FIG. 46 is a flowchart showing a partial erase operation.

FIG. 47 is a flowchart showing a VOB rear part erasing process in the partial erasing operation.

FIG. 48 is a flowchart showing VOB front part erasing processing in the partial erasing operation.

FIG. 49 (a) Partial deletion of a portion including the VOB head,
FIGS. 4B and 4C are diagrams illustrating (b) partial erasure of an intermediate portion of a VOB and (c) partial erasure of a portion including the end of the VOB.

[Explanation of symbols]

 Reference Signs List 11 optical pickup 12 ECC processing unit 13 track buffer 14 switch 15 encoder unit 16 decoder unit 41 pack header 42 packet header 43 payload 51 STC 52 demultiplexer 53 video buffer 54 video decoder 55 reorder buffer 56 switch 57 audio buffer 58 audio decoder 7801 user Interface section 7802 System control section 7803 Input section 7804 Encoder section 7805 Output section 7806 Decoder section 7807 Track buffer 7808 Drive

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Tsuga 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-32783 (JP, A) JP-A-9 -1006659 (JP, A) WO 95/34071 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 27/00-27/34 G11B 20/10-20/12 H04N 5/76-5/937 H04N 7/12

Claims (6)

(57) [Claims] 1. A recording apparatus comprising: video data of a video composed of a plurality of frames; and management information including recording date and time information which is information on a date and time when a first frame of the plurality of frames was recorded. An optical disc, wherein the recording date and time information includes date and time information for storing information of year, month, day, hour, minute, and second of the recording date and time of the first frame, and recording date and time of the first frame that cannot be represented by the date and time information. An optical disk including date and time error information for storing fractional information of less than one second; input means for inputting an instruction from a user to erase a part of the video recorded on the optical disk; and erasing based on the instruction An optical disc recording system, comprising: updating means for updating the recording date and time information when a part of the video includes the first frame. 2. When a plurality of consecutive frames including the first frame are deleted, the updating unit replaces information stored in the date and time information with a time length of the deleted frame. Is changed to the information of the first time obtained by adding the time of one second or more and the time indicated by the date and time information of the first frame, and the information stored in the date and time error information is changed to the time of the deleted frame. A second obtained by adding the time of less than one second of the length and the time indicated by the date and time error information of the first frame.
2. The optical disk recording system according to claim 1, wherein the information is changed to the time information. 3. When the second time exceeds one second, the updating means adds a second of the information stored in the date and time information to the first time for a third time. The optical disc recording system according to claim 2, wherein the information is updated to information, and information stored in the date and time error information is updated to information of a fourth time obtained by subtracting one second from the second time. 4. The optical disc recording system according to claim 1, wherein the date and time error information is represented by the number of fields. 5. The optical disk recording system according to claim 1, wherein the date and time error information is represented by a time stamp. 6. Recording of video data of a video composed of a plurality of frames, and management information including recording date and time information which is information of the date and time when the first frame of the plurality of frames was recorded. An optical disc, wherein the recording date and time information includes date and time information for storing information of year, month, day, hour, minute, and second of the recording date and time of the first frame, and recording date and time of the first frame that cannot be represented by the date and time information. An optical disc including date and time error information storing fractional information of less than one second; and when reproducing a video from the optical disc, add a reproduction time from the first frame to a value of the recording date and time information of the first frame. An optical disc reproducing system comprising: means for calculating recording date and time information of a frame being reproduced; and means for combining the calculated recording date and time information with a video. .