JP2002232844A - Information recording medium, device and method for recording picture, device and method for reproducing picture, and program storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium which can guarantee the smooth and continuous reproduction of AV data and in which the AV data can efficiently be recorded with data other than AV data. SOLUTION: Time maps show VOBU maps existing at the time obtained by adding the head time of VOB and TM-OFS, and reproduction time after TMU, 2TMU, 3TMU.... The VOBU maps is a table showing the reference picture size, VOBU reproduction time and the VOBU size. It is not necessary to record recording positions for the respective VOBU maps in accordance with reproduction time, and reproduction time and the data sizes are included for respective video object units. Thus, data length can be shorter than the data size, and a table size is small in reproduction time. Furthermore, memory quantity required for the recording device and the reproducing device is less since the VOBU map is written into a data area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk or an information recording device used for recording video data, and a computer readable program storage medium storing a file management program.

[0002]

2. Description of the Related Art In recent years, CD-ROMs, DVDs (Digital
An optical disk such as a Versatile Disc-ROM is used for recording video data (hereinafter, referred to as AV data) such as a movie in addition to being used as secondary storage of a computer. Further, as a recordable information recording medium, D
VD-RAM disk (hereinafter abbreviated as DVD-RAM)
Has been put to practical use.

Hereinafter, in a conventional DVD-ROM, A
Special playback such as n-times fast forward or rewind playback of V data will be described. A recorded on DVD-ROM
For V data, a variable bit rate compression encoding method is used to increase the compression rate. The variable bit rate means that the compression code amount per one frame image is variable. Therefore, since the compression code amount is not proportional to the reproduction time, even if the AV data is read out at regular intervals for each constant code size, it is not possible to obtain an image at constant time intervals.

[0004] For this reason, DVD-ROMs employ a technique of recording information for special reproduction anywhere in AV data. Specifically, the AV data is compression-encoded in accordance with MPEG2, and is a section (called a GOP) of 0.4 seconds or more and 1.0 seconds (exceptionally 1.2 seconds at the end of VOB). Each time, a DVD-specific information called an NV pack is added to the head of the GOP. In addition,
The data from the NV pack to before the next NV pack is
It is called OBU (short for Video OBject Unit).

[0005] The NV pack is 2 Kbytes in size,
Information for referencing a neighboring NV pack and the data size of the first reference picture in the GOP are recorded. Here, information for referencing a neighboring NV pack is based on the time code at the beginning of the VOBU.
The addresses of the NV packs of the forward and backward VOBUs that are separated by a certain time interval are indicated by a relative value from the address of the own NV pack. This time interval is from 1 second to 15 seconds every other second, 20 seconds, 60 seconds, 120 seconds.
Seconds and 240 seconds are used.

Next, an example of the operation of special reproduction such as fast forward reproduction and rewind reproduction will be described. By reproducing only the reference pictures of the VOBU at certain time intervals in accordance with the reproduction speed, it is possible to realize special reproduction at a substantially uniform speed. VO at fixed time intervals
In order to read BUs one after another, information indicating an address of a neighboring NV pack having the NV pack is used. Also,
For each time code at a certain time interval from the beginning of the AV data, time search map information indicating the address of the AV data in the VOBU corresponding to the time code is recorded. By referring to the time map information, reproduction of the AV data can be started from the designated time code.

However, the technique of recording the information for special reproduction as an NV pack everywhere in the AV data is as follows.
There is a problem that it cannot be used when recording on a recordable information recording medium such as a DVD-RAM in real time. This is because, even if an attempt is made to record the above-mentioned NV pack while recording AV data in real time, information on the AV data portion to be recorded, such as the address of the NV pack of the backward VOBU, cannot be obtained.

Although it is possible to generate special reproduction information to be recorded in all NV packs after the end of recording of AV data, it is considered that the generated information is recorded as an NV pack in the AV data area. , And VOBUs, the number of accesses to the disk is almost the same as the number of VOBUs. Although it is conceivable that the AV data and the special reproduction information are not stored in the same AV data area, it is necessary to store the special reproduction information in the main memory in order to perform the special reproduction at high speed. There is a problem that a large main storage capacity is required.

[0009] Therefore, in a DVD-RAM, information called a time map is generated and used to realize special reproduction. Time map is VOBU table and TIME
It consists of a table and offset information. VOB
The U table contains the playback time and size of the VOBU and the size of the reference image. The TIME table contains the identification information and address of the VOBU corresponding to the TIME table, the time specified by the TIME table, The difference from the start time of the VOBU is included. The offset information includes address difference information from the first VOB to the first VOBU, and the first VOBU to the first TIM.
Difference information of the time until the E entry is included. By using this time map information, it is possible to specify the picture in the VOBU corresponding to the given reproduction start time.

[0010]

However, the current DVD
-In the case of an information recording medium having a capacity equal to or larger than the RAM, considering that the information recording medium has the same time map structure as that of the current DVD-RAM for performing the special reproduction, a huge storage capacity is required for the reproducing apparatus. This is a big problem.

The present invention reduces the data amount of special reproduction information to be stored in a reproduction / recording device at one time, and even when the memory amount of the reproduction / recording device is small, real-time recording of AV data and special reproduction information simultaneously. It is an object of the present invention to provide an information recording medium recording device, a program storage medium, and an information recording medium that can generate a program.

[0012]

In order to solve the above-mentioned problems, an information recording medium according to the present invention is an information recording medium having a data area and a time map area. A video object including a plurality of video object units including pictures is recorded, and the time map area includes a first table storing information on a reproduction time of the video object, a time offset indicating an offset of the reproduction time, , An address offset with respect to a recording address of the object, and the first table stores identification information of a video object unit including a picture to be reproduced at each reproduction time corresponding to each reproduction time at a fixed time interval. A recording address on the information recording medium; And the difference between the start time of the video object unit indicated by the first table and the start time of the video object unit indicated by the first table are recorded in the time offset. Information indicating a difference time from the time is recorded, and the address offset records information indicating a difference between a recording address at a head of the video object and an address of a head of the data area, and the data area includes: A second table storing information on a reproduction time of the video object is recorded. The second table stores a reproduction time of a plurality of video object units and a data size corresponding to each of the plurality of video object units. And the destination in each video object unit The data size of the reference picture is characterized in that it is recorded.

The second table contains, for each video object unit, the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, and the data size of the own video object unit. The data size of the first reference picture may be recorded.

Further, the recording apparatus of the present invention is an apparatus for recording video data on an information recording medium, wherein at least input means for receiving input of the video data to be recorded is provided by compressing the input video data. Compression means for generating a video object consisting of a plurality of video object units including one picture, writing means for writing data on the information recording medium, and control means for controlling the writing means, the control means comprising: Controlling the writing means to write the video object in the data area of the information recording medium, and identifying a video object unit including a picture to be reproduced at each reproduction time, corresponding to each reproduction time at a predetermined time interval. Information, a recording address on the information recording medium, and the certain time Generating a first table in which the difference between the playback time of the interval and the start time of the video object unit indicated by the first table is stored; A second table in which time, data size, and data size of the first reference picture in each video object unit are stored is generated. And generating an address offset indicating a difference between a recording address at the head of the video object and an address of the head of the data area. Table and time off Write a Tsu bets and the address offset, and controlling the write means to write the second table in the data area of the information recording medium.

Here, the control means, at the time of generating the second table, for each of the video object units, the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, May be configured to generate a second table in which the data size of the first reference picture of the video object unit is stored.

Also, a reproducing apparatus according to the present invention is an apparatus for reproducing a video object recorded on the information recording medium, wherein the reproducing means reads data from the information recording medium and the reproducing means reproduces a video object. Control means for controlling the read means and the reproduction means, wherein the control means receives an input of a reproduction start time, and reads the first table, the time offset and the address offset. By referring to the read first table, the time offset, and the address offset to specify a video object unit group including a picture to be reproduced at the reproduction start time, and Before reading the second table included in the object unit group By controlling the reading means and referring to the read second table, a video object unit including a picture to be reproduced at the reproduction start time is specified, and reproduction is started based on the specified video object unit. The reading means and the reproducing means are controlled so as to be controlled.

Here, the control means receives a reproduction start time, and receives the second table recorded in the data area, the first table recorded in a time map area, the time offset and the address offset. Controlling the read means to read the video object unit including the picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset. Specifying the second table included in the specified video object unit, controlling the reading unit, and referring to the read second table to include a picture to be reproduced at the reproduction start time. Identify the video object unit and identify the identified video object. Ekutoyunitto may be configured to control said reading means and the reproducing means so that reproduction is started on the basis of.

Further, the program storage medium of the present invention stores a computer-readable program storing a program for a recording apparatus for recording a video object comprising a plurality of video object units including at least one picture on an information recording medium. A medium,
The program includes a step of writing the video object in a data area of the information recording medium, and identifying information of a video object unit including a picture to be reproduced at each reproduction time, corresponding to each reproduction time at a fixed time interval. Generating a first table in which a recording address on the information recording medium and a difference between a reproduction time at the predetermined time interval and a start time of a video object unit indicated by the first table are stored; For each of the plurality of video object units, the playback time of the plurality of video object units,
Generating a second table in which the data size and the data size of the first reference picture in each video object unit are stored; and calculating the playback time at the beginning of the video object and the playback time at the fixed time interval. Generating a time offset indicating a difference time; generating an address offset indicating a difference between a recording address at a head of the video object and an address of a head of the data area; and generating a time offset in a time map area of the information recording medium. Writing the first table, the time offset and the address offset, and writing the second table to a data area of the information recording medium by a computer.

Here, for each of the video object units, the program includes a reproduction time of the immediately preceding and own video object unit, a data size of the immediately preceding and own video object unit, and a reference of the head of the own video object unit. The step of generating the second table storing the data size of the picture may be executed by a computer.

Further, the program storage medium of the present invention comprises: a reading means for reading data from the information recording medium;
A computer-readable recording medium having recorded thereon a program for a reproducing apparatus comprising: a reproducing unit that reproduces a video object, wherein the program includes a step of receiving an input of a reproduction start time; Controlling the reading means to read the time offset and the address offset; and by referring to the read first table, the time offset and the address offset,
Specifying a video object unit including a picture to be reproduced at the reproduction start time, and reproducing at the reproduction start time by referring to the read first table, the time offset, and the address offset Specifying a group of video object units including a picture to be read, reading a second table included in the specified group of video object units, and referring to the read second table to determine the reproduction start time. Causing a computer to execute a step of specifying a video object unit including a picture to be reproduced, and a step of reading and controlling the reading unit and the reproducing unit to start reproduction based on the specified video object unit. To And butterflies.

Here, the program specifies a video object unit including a picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset. Reading the second table included in the specified video object unit, and referring to the read second table to determine the video object unit including the picture to be reproduced at the reproduction start time. The computer may be configured to execute a specifying step and a reading and reproducing step of controlling the reproducing means so as to start reproduction based on the specified video object unit.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Optical Disk (1-1) Physical Structure of Recordable Optical Disk FIG. 1 shows the appearance and recording area of a DVD-RAM disk, which is a recordable optical disk according to an embodiment of the present invention. FIG. As shown in the figure, the DVD-RAM disk has a lead-in area at the innermost circumference, a lead-out area at the outermost circumference, and a data area between them. In the lead-in area, a reference signal necessary for stabilizing the servo in the recording / reproducing apparatus, an identification signal with another medium and the like are recorded. The same reference signal as the lead-in area is recorded in the lead-out area.

The data area is divided into sectors (2 kbytes), which are the minimum access units. In the data area, management information for a file system, AV data, an AV data management file, non-AV data, and the like are recorded. The management information for the file system is DVD-R
This is information including the directory structure of the AM, the recording position of the file, the free state of the data area, and the like, and is used when a file is created, written, read, or deleted.

In the AV data, a unit called a video object (hereinafter abbreviated as VOB) is recorded as one file. VOB is a file generated by one continuous recording by the optical disc recording apparatus.
For example, it corresponds to all or part of a movie or all or part of a television program. The VOB is composed of a plurality of video object units (hereinafter abbreviated as VOBU).

One VOBU is an AV data portion corresponding to about 0.4 to 1.0 seconds of the reproduction time of video data, and is a GOP (Group of Pictur) in the MPEG2 standard.
The video data section called e) is included. This GOP includes an I (Intra) picture (intra-frame coded picture), a P (Predictive) picture (inter-frame forward predictive coded picture), and a B (Bidirectional picture) in the MPEG2 standard.
y Predictive) picture (inter-frame bidirectional predictive coded image), and includes at least one I picture. This enables independent reproduction of the GOP.
In particular, in the case of special playback such as fast forward playback or fast reverse playback, or playback at a specified time, an I picture in a GOP is extracted as an image to be played back, or a P or B to be extracted as a reference image and played back. The picture will be played.

The AV data management file is a DVD-RA
A file for managing all AV data in M,
Time map information and the like corresponding to VOBs on a one-to-one basis are recorded. The time map information is information in which a VOB playback time is associated with a recording position, and has a hierarchical data structure. That is, the time map information has hierarchical first and second time tables.

A first time table (hereinafter, also referred to as a time map table or a TMAP table) is a reproduction time corresponding to a VOB and has a fixed time interval (for example, 10 times).
2 is a table showing, for each reproduction time in order of (sec), the recording position (sector address: LSN) of the VOBU corresponding to the reproduction time. The second time table (also referred to as a VOBU table) is a table including the playback time and data size of each VOBU in the order of the playback time from the beginning of the VOB. Error correction processing for a sector is performed for every 16 sectors. In the present embodiment, ECC (Error Correc
ting Code) is assigned to the sector group (16 sectors).
Called CC block.

A DVD-RAM is used in a recording / reproducing apparatus in a Z-CLV (Zone-Constant Linear Velocity).
The data area is divided into a plurality of zone areas in order to realize the rotation control referred to as “data”. FIG. 2 (a) shows the DV
FIG. 3 is a diagram showing a plurality of zone areas provided concentrically in a D-RAM. As shown in the figure, the DVD-RAM is divided into 24 zone areas of zone 0 to zone 23. Here, the zone area refers to a group of tracks accessed at the same angular velocity. In the present embodiment, one zone area includes 1888 tracks. The rotational angular velocity of the DVD-RAM is set for each zone area so as to become faster in the zone on the inner peripheral side, and is kept constant while the optical pickup accesses in one zone. With this, DVD-
The recording density of the RAM is increased, and the rotation control in the recording device / reproducing device is facilitated.

FIG. 2B is an explanatory diagram in which the lead-in area, the zone areas 0 to 23, and the lead-out area shown concentrically in FIG. 2A are arranged in the horizontal direction. The lead-in area and the lead-out area have a defect management area (DMA: Defect Management Area) inside. The defect management area refers to an area in which position information indicating the position of a sector in which a defect has occurred and alternative position information indicating in which of the above-mentioned alternative areas a sector replacing the defective sector exists are recorded. .

Each zone area has a user area inside thereof, and has an alternative area and an unused area at the boundary. The user area refers to an area that can be used as a recording area by the file system. The replacement area is an area used when a defective sector exists.
The unused area is an area that is not used for data recording.
An unused area is provided for about two tracks. The unused area is provided because the sector address is recorded at the same position on an adjacent track in the zone, but the ZC
In the LV, since the recording position of the sector address is different in the track adjacent to the zone boundary, it is to prevent the sector address from being erroneously determined.

As described above, there are sectors not used for data recording at the zone boundaries. For this reason, the DVD-R is designed to continuously show only the sectors used for data recording.
AM is a logical sector number (LSN: Logicala) in order from the inner circumference.
l Sector Number) is assigned to a physical sector in the user area. As shown in FIG. 2C, an area for recording user data, which is constituted by sectors to which the LSN is assigned, is called a volume space.

As shown in FIG. 2D, volume structure information for treating the disk as a logical volume is recorded on the inner and outer peripheral portions of the volume space. The portion excluding the inner and outer volume structure information areas in the volume space is an area where user files are recorded, and is called a partition space. In the partition space, a logical block number (LBN: Logical Block Number) is assigned to each sector from the first sector.

FIG. 3 is a diagram hierarchically showing the relationship between sectors and ECC blocks in the zone area. As shown in the figure, each zone area includes a plurality of ECC blocks. It should be noted here that, in the recording apparatus, non-AV data is allocated in areas in units of sectors, whereas AV data is allocated in units of continuous recording areas that can guarantee continuous reproduction.
The continuous recording area referred to here is an EC that does not straddle a zone boundary.
A continuous sector of a certain size (about 7 Mbytes) or more, which is an area of an integral multiple of the C block. However, when the AV data is composed of a plurality of extents, the last extent may be smaller than the certain size. The reason that the continuous recording area does not straddle the zone boundary is that if the straddle straddles the zone, the rotation angular velocity of the optical disc is changed, so that continuous reading cannot be performed. In addition, the reason why it is set to an integral multiple of the ECC block is that it is the minimum unit of the ECC processing.

FIG. 4 shows a sector management table included in the file system management information recorded in the volume space and a continuous recording area management file for managing the above-mentioned continuous recording area. In the figure, the volume space,
The sectors and the recorded contents of the sectors are illustrated hierarchically.

The first layer shows the volume space shown in FIG. The second hierarchy indicates a sector area in the partition space where the sector management table is recorded. A sector management table (also referred to as a space bitmap) indicating the data allocation status for each sector is recorded in the sector areas of the logical block numbers 0 to 79. Since the continuous recording area management file is recorded as a non-AV file, it is recorded not in a fixed area but in any of the free areas as a normal file.

As shown in the third hierarchy, the space bitmap indicates whether all sectors in the partition space are allocated or unallocated. In this example, it is a bit map of one bit per sector. For example, since logical block numbers 0 to 79 are allocated as a space bitmap, "0"
(Assigned). The continuous recording area management file indicates an area already allocated as a continuous recording area in the partition space as shown in the third layer. In FIG. , Entries e1 to e4
. Are represented as a table having a list structure composed of. Outside the frame on the left side of the table, the relative address (the number of bytes) from the top of the table is added.

Each entry consists of a start sector number (LSN), an end sector number, and a pointer from the left side of FIG. The area of the optical disk from the start sector number to the end sector number in each entry represents a part of continuous recording or a sector area to which one continuous recording is allocated.
The pointer points to an entry indicating the subsequent continuous recording area, and is represented by a relative address from the table head. However, the pointer of the last entry e4 takes a value (-1) indicating the end. In the example of FIG.
Represents a continuous area from sector numbers 6848 to 15983, and indicates an entry e2 (subsequent continuous recording area) recorded from the 12th byte. The same applies to other entries. Entries e1 to e4 indicate one continuous area (6848 to 31983) when AV data is recorded four times and continuous recording areas are sequentially added.

The allocation of the continuous recording area and the space bit map need to be managed in conjunction with each other as follows. For example, in the optical disk recording device, the area allocated as the continuous recording area is changed to the allocated area in the space bitmap. FIG. 5 shows a DVD-RAM
2 shows an example of AV data, non-AV data, and a directory recorded in the. In the figure, an ellipse represents a directory, and a rectangle represents a file. The root directory has a directory called DVD_RTAV, other directories, and non-AV data of other files. The DVD_RTAV directory is VR_MOVI
E. FIG. VRO, VR_STILL. VRO, VR_AUD
IO. A plurality of AV files called VRO and VR_MA
NGR. IFO, VR_MANGER. A called BUP
V data management file. AV file V
R_MOVIE. VRO, VR_STILL. VRO,
VR_AUDIO. VRO is recorded in the data area.

(1.2) AV Data Management File FIG. 6 shows the AV data management file (VR_
MANGR. FIG. 3 is an explanatory diagram hierarchically showing recorded contents of an IFO). As shown in FIG.
V file management table 820, PGC information table 8
30. The logical connection between these tables and VOBs is shown in FIGS.

The PGC information table 830 contains a DV
Information indicating a list of titles recorded in the D-RAM is included. Here, the title includes a program recorded by the user in the recording device, a title created by editing by the user, and the like. The PGC refers to a series of AV data in which arbitrary sections of an arbitrary VOB are logically connected. The PGC information refers to information indicating a logical connection relationship of an arbitrary section of an arbitrary VOB.

The AV file management table 820 contains
This is information indicating the correspondence between the playback time of the file, that is, the VOB, and the recording position.
1, 822... Are recorded. The VOB information 821, 822,...
VOB general information indicating unique information, and time map information for associating the playback time of the VOB with the recording position are included.

The VOB general information 821a includes a VOB identifier for indicating which VOB the VOB information corresponds to,
This is information indicating the playback time of the corresponding VOB. The time map information 821b includes the above-described first time table and second time table. As shown in FIGS. 7 and 8, the first time table (time map table)
A time map # 1 indicating a recording position (sector address) of a VOBU corresponding to the reproduction time at each reproduction time at a predetermined time interval (for example, 10 seconds) on the time axis starting from the beginning of the OB. This is a table in which # 2... Are arranged. Here, when VOBU maps for a plurality of VOBUs (for TMUs) are recorded together (FIG. 7), the VOBU map includes the data size of the immediately preceding VOBU, the reproduction time, the data size of its own VOBU,
This is the case where the reproduction time and the reference image size are recorded (FIG. 8).

Second time table (VOBU table)
When the VOBU maps for a plurality of VOBUs (for the TMU) are recorded together, as shown in FIG. 7, the playback time of the VOBU and the data size of the VOBU are arranged in the order of the playback time from the beginning of the VOB. It is a table in which included VOBU maps are arranged. Second timetable (V
OBU table) stores the previous VOB in the VOBU map.
If the data size and playback time of U and the data size, playback time, and reference image size of its own VOBU are recorded, as shown in FIG. Playback time and VOBU data size, and the immediately preceding VOBU playback time and VOBU
It is a table in which a VOBU map including a BU data size is arranged. Here, the VOBU map in the case of FIG.
It may be recorded in a Real-time Data Information pack (RDI pack).

The PGC information table 830 stores a plurality of PGs.
It is a table composed of C information 831, 832. P
.. Are a table in which information (referred to as cells) indicating video sections in a VOB specified by a set of a start time and an end time is arranged in the order of reproduction time, and the A series of AV data obtained by logically connecting sections in the order of arrangement is shown. Each of the cells 831a, 831b... Includes an AV file identifier, a VOB identifier, and a set of a start time and an end time indicating a video section.

In the example shown in FIG. 6, a series of AV data corresponding to one title is composed of PGC information 831 → cell 8
31a to 831c → VOB information 821, 822, → VO
B # 1 and # 2 are specified in this order. In this example, AV data for one title is composed of two VOs.
B # 1 and # 2, the simplest example of PGC information such as a newly recorded title is 1 title → 1 PGC information → 1 cell → 1VOB information → 1VO
One title is composed of one VOB such as B.

FIG. 9 is a diagram showing the data structure of an AV file, that is, a VOB. As shown in FIG.
It consists of a plurality of VOBUs. The VOBU is an A including compressed video data of about 0.4 to 1.0 seconds including at least one I (Intra) picture and other audio data.
This is a V data section, and is composed of a pack sequence in which a video pack (V_PCK) and an audio pack (A_PCK) are interleaved. One pack is a packed packet in MPEG2, includes a pack header, a packet header, video data / audio data, and has a size of 2 kbytes, which is the same as the sector size.

FIG. 10 is a diagram showing a more detailed data structure of time map information corresponding to one VOB. In the figure, time map information 821b is information for associating the playback time of the VOB with the recording position, and includes general time map information 8210, a time map table 8220,
It consists of a VOBU table 8230. FIG. 1 shows a logical connection between the time map table and the VOBU table.
0 is shown.

The time map general information 8210 includes the number of time maps and the number of VOBU maps included in the time map information, a time unit (hereinafter abbreviated as TMU) indicating a fixed time interval in which the time map is provided, a start time of the VOB, and A time offset (hereinafter abbreviated as TM_OFS) indicating a time difference from the time of the leading time map, and VOB
, And an address offset (hereinafter abbreviated as ADR_OFS) indicating a difference between an address of the recording address at the head of the data file and a head of the data area of the AV file. The time map table 8220 includes general time map information 8210.
.. Are provided at predetermined time intervals indicated by the TMU in the drawing, and are composed of a plurality of time maps 8211, 8212,. As shown in FIG.
.., Are the start time of the VOB and TM_OFS
Time, after TMU, after 2 TMU, 3 TMU
Refers to the VOBU map existing at the playback time of later. The reproduction time for the time map #i (hereinafter referred to as time map time) is represented by the following equation.

Time map time = (TMU * (i-1))
+ TM_OFS) The time maps 8211, 8212.
BU map number, time difference (abbreviated as TM_DIFF) and V
OBU address (abbreviated as VOBU_ADR).

The VOBU map number 8212a is the number of the VOBU map corresponding to the time map time.
TM_DIFF 8212b represents the time difference between the start time of the VOBU and the time map time. So VOBU
The start time of #j is represented by the following equation.

VOBU start time = (TMU * (j-1)
+ TM_OFS-TM_DIFF) VOBU_ADR8212c is the start address of the VOBU. Here, VOBs for a plurality of VOBUs
In the case where the U tables are collectively recorded in the data area, in the present embodiment, the VOBU tables for the TMU are recorded collectively. VOBU table 82
30 is a VOB corresponding to the VOBU in the TMU on a one-to-one basis.
This is a table in which U maps 8231, 8232,... Are arranged. The VOBU maps 8231, 8232,...
Reference image size, VOBU playback time, VOBU
Consists of size. The reference image size 8232a is VOB
This is the size of the first I picture in U. It is used for reading a reference image at the time of special reproduction or reproduction at a specified time.

The VOBU table stores the immediately preceding VOB
When recording the data size and reproduction time of U and the data size, reproduction time and reference image size of its own VOBU, a VOBU table corresponding to the head of each VOBU shall be recorded.

The VOBU playback time 8232b is the same as the VOBU playback time 8232b.
This is the time required for reproducing the BU. This is used for finding a target image at the time of special reproduction or reproduction at a specified time. That is, the playback device sets the VOB start time at the above VOBU time until the time of the target image is reached.
One VO by adding U playback time sequentially
The BU is specified, and one image in the VOBU is specified.

The VOBU size 8232c is the data size of the VOBU. This is used to specify the address of the target image at the time of special reproduction or reproduction at a specified time. That is, the playback device sets the VOBU in the VOBU map sequence starting from the VOBU map at the VOBU start time until the time of the target image is reached.
By sequentially adding the sizes, one VOBU including the target image is specified, and one image in the VOBU is further specified.

(2) Recording / Reproducing Apparatus Next, an optical disc recording / reproducing apparatus according to the present invention will be described with reference to the drawings.

(2-1) Overall System FIG. 12 shows an example of the configuration of a system using the optical disk recording / reproducing apparatus according to the present embodiment. This system includes an optical disk recording / reproducing device 10 (hereinafter referred to as a DVD recorder 10).
), A remote controller 6 for operating this, a display 12 connected to a DVD recorder 10, and an antenna 1
Contains one. The DVD recorder 10 is provided with the DVD-RAM as an optical disk, compresses audio / video data included in an analog broadcast wave received via the antenna 11, and then outputs the DVD-RAM as an AV file.
And expands the compressed audio / video data recorded in the DVD-RAM, and outputs the video signal and the audio signal to the display 12.

(2-2) Hardware Configuration of DVD Recorder 10 FIG. 13 is a block diagram showing a hardware configuration of the DVD recorder 10. The DVD recorder 10 includes a control unit 1, an MPEG encoder 2, a disk access unit 3,
It has an MPEG decoder 4, a video signal processing unit 5, a remote control 6, a bus 7, a remote control signal receiving unit 8, and a receiver 9.

The control unit 1 has a CPU 1a, a processor bus 1b, a bus interface 1c, and a main memory 1d.
By executing the program stored in the main memory 1d, the entire device such as recording, reproduction, and editing of AV data in the DVD recorder 10 is controlled. In particular, the control unit 1
In recording V data, when an AV file (VOB) is recorded, VOB information corresponding to the recorded VOB,
It generates PGC information and the like, and records or updates the AV data management file. Further, when reproducing the AV data, the control unit 1 sets the PG in the AV data management file shown in FIG.
The section specified by the start time and the end time in the cell included in the C information is reproduced by obtaining an address based on the VOB information. Especially in the case of special playback,
The addresses of the reference images existing every fixed time (for example, 5 seconds, −5 seconds, etc.) are sequentially obtained based on the VOB information,
It is configured to perform fast forward playback and fast reverse playback.

The MPEG encoder 2 compresses an audio / video signal contained in an analog broadcast wave received by the receiver 9 via the antenna 11 into an MPEG stream. The disk access unit 3 has a track buffer 3a therein, and under the control of the control unit 1, records the MPEG stream input from the MPEG encoder 2 on the DVD-RAM via the track buffer 3a.
The MPEG stream is read from the D-RAM and output to the MPEG decoder 4 via the track buffer 3a.

The MPEG decoder 4 reads the MPE read from the DVD-RAM by the disk access unit 3.
A video signal processing unit 5 that expands the G stream and outputs video data and an audio signal as a result of the expansion performs signal processing for converting the video data from the MPEG decoder 4 into a video signal for the display 12.

The remote control signal receiving section 8 receives a remote control signal transmitted from the remote control 6 as shown in FIG.
The control unit 1 is notified of what kind of user operation has been performed. As shown in FIG. 12, the DVD recorder 10 has a configuration premised on substituting for a conventional stationary home VTR. Not limited to this configuration, DVD
If the RAM is also used as a recording medium for a computer, the following configuration may be used. That is, the disk access unit 3 is connected to a computer bus via an IF called SCSI or IDE as a DVD-RAM drive device. The components other than the disk access unit 3 in FIG. 2 are realized by executing an OS and application programs on computer hardware.

FIG. 15 is a block diagram showing the configuration of the MPEG encoder 2. As shown in the figure, the MPEG encoder 2 includes a video encoder 2a, a video buffer 2b storing the output of the video encoder, an audio encoder 2c, an audio buffer 2d storing the output of the audio encoder, and encoding in the video buffer 2b. Video data and audio buffer 2d
And a system time clock (STC) unit 2f that multiplexes the encoded audio data in the encoder and generates a synchronization clock for the encoder 2.
And an encoder control unit 2 for controlling and managing these
g.

The encoder control unit 2g passes information such as GOP information and picture information to the control unit 1 of FIG. 13 every time a VOBU is generated, particularly during encoding. Here, the GOP information includes the number of packs of the VOBU and the number of packs of the first I picture in the VOBU. The pack referred to here is the video pack (V_PACK) shown in FIG.
An audio pack (A_PACK), which has the same fixed length of 2 kbytes as a sector. Therefore, in this embodiment, the GOP information includes the number of sectors occupied by the VOBU,
It means the number of sectors occupied by the first I picture in the OBU.

FIG. 16 is a block diagram showing the structure of the MPEG decoder 4. As shown in FIG.
Includes a demultiplexer 4a for separating an MPEG stream into a video stream and an audio stream, a video buffer 4b for temporarily storing the separated video stream, and a video decoder 4c for decoding the video stream stored in the video buffer 4b. An audio buffer 4d for temporarily storing the separated audio stream, an audio decoder 4e for decoding the audio stream stored in the audio buffer 4d, and an STC (system time clock) unit 4f for generating a synchronization clock. An adder 4g for adding an offset to a clock; and a selector for selecting one of a synchronous clock and a synchronous clock with an offset and supplying the same to a demultiplexer 4a, an audio decoder 4e, and a video decoder 4c. Composed of a h~4j.

(2-3) Functional Block Diagram FIG. 17 is a functional block diagram showing the configuration of the DVD recorder 10 by function. Each function in the figure is realized by the CPU 1a in the control unit 1 executing the program in the main memory 1d to control the hardware shown in FIG.

In FIG. 17, the DVD recorder 10 includes a disk recording unit 100, a disk reading unit 101, a file system unit 102, a recording / editing / playback control unit 10
5, user I / F unit 106, AV data recording unit 110,
It comprises an AV data editing unit 120 and an AV data reproducing unit 130. When the disk recording unit 100 receives a logical sector number and logical data (2048 bytes) in units of one or more sectors from the file system unit 102,
Record the data. However, actually, the disk recording unit 100 reads and writes logical data on the disk in units of ECC blocks (16 sectors). Logical data is 1
If the number of sectors is less than six, the ECC block is read once, subjected to ECC processing, and then recorded.

When a logical sector number and the number of sectors are input from the file system unit 102, the disk reading unit 101 reads the sector data and transfers the sector data to the file system unit. However, actually, reading is performed in ECC block units, and only necessary sector data is transferred to the file system unit through the ECC processing. This is equivalent to 16 bits per ECC block when reading AV data.
This is because reading is performed in sector units to reduce the overhead as in the case of the disk recording unit 100.

The file system unit 102 mainly stores
It has an AV file system unit 103 that writes and edits V files, and a common file system unit 104 that performs common processing between AV files and non-AV files.
0, upon receiving a command related to writing or reading of a file from the AV data reproducing unit 130, file management is performed using the sector of the optical disk as a minimum unit.

The recording / editing / playback control unit 105 is a DVD
A part that controls the entire recorder 10. In particular, it controls a guidance display for prompting a user operation, accepts a user operation corresponding thereto via the user I / F unit 106, and records new AV data in accordance with the user operation. The playback and editing of recorded AV data are performed by the AV data recording unit 11.
0, AV data editing unit 120, AV data reproducing unit 130
Request for

The user I / F unit 106 receives a user operation from the remote controller 6, and performs recording / editing / reproduction control unit 10.
Notify 5 The control data management unit 107 reads out an AV data management file, which is non-AV data, onto the main storage 1d, and immediately provides information in response to a request from each unit. The AV data recording unit 110 receives a recording request from the recording / editing / playback control unit 105 and issues a command required for the requested recording to the AV file system unit 103. Therefore, the AV data recording unit 110 has an AV data input unit 111 and an AV file management information generation unit 112.

The AV data input unit 111 converts an image signal and an audio signal into MPEG data, that is, encodes in real time, and records the encoded MPEG data as an AV file on a disc. Output to Also,
When encoding, the AV data input unit 111
The number of packs constituting the VOBU and the number of packs of the first reference picture are calculated for each VOBU of the EG data, and the obtained value is used as GOP information in a memory (main storage 1).
Store in d).

Here, VO for VOBU for TMU
When recording the BU table collectively, the AV data input unit 111 records an AV file for the TMU.
At this time, it is assumed that the recording is performed in advance with a space for the AV data management file. Next, the GO stored in the memory
Based on the P information, the AV file management information generation unit 112
Stores the VOBU table corresponding to the AV file
It is generated as file management information, and the AV data management file is recorded in the data area of the DVD-RAM previously secured via the file system unit 102.

The VOBU table stores the immediately preceding VOB
To record the data size and playback time of U and the data size, playback time and reference image size of its own VOBU, the VOBU table for one VOBU generated by the AV file management information generation unit 112 is stored in the AV file management information. And recorded in the data area.

The AV file management information generation unit 112
At the end of recording of the AV file by the V data input unit 111, VOB information (time map table) corresponding to the AV file based on the information stored in the memory,
The PGC information is generated as AV file management information, the AV data management file held in the control data management unit 107 is updated, and the updated AV data management file is recorded on the DVD-RAM via the file system unit 102.

The AV data editing unit 120 records, edits,
Upon receiving an editing request from the reproduction control unit 105, a command necessary for editing is issued to the AV file system unit 103.
The AV data reproduction unit 130 is a recording / editing / reproduction control unit 1
In response to a playback request from the AV file system 05, a command necessary for the requested playback is issued to the AV file system unit 103.

(2-4) Commands Executed by File System Unit 102 Next, various commands supported by the file system unit 102 will be described. File system unit 102
Are the control data management unit 107 and the AV data recording unit 11
0, AV data editing unit 120, AV data reproducing unit 13
0, receives various commands from the recording / editing / playback control unit 105 and the like to perform file management. The following is a list showing commands related to file management supported by the common file system unit 104 and the AV file system unit 103. Processing contents of the file system unit 102 for each command will be briefly described.

"CREATE" creates a new file on the disk and returns a file identification descriptor. "DEL
"ETE" deletes a file existing on the disk.
"OPEN" obtains a file identification descriptor for the file in order to access the file recorded on the disc.

"CLOSE" closes an open file. "WRITE" records a file on a disk. “READ” reads a file recorded on a disk. “SEEK” moves in a data stream recorded on a disc. "RENA
“ME” changes the file name.

"MKDIR" creates a new directory on the disc. “RMDIR” deletes a directory existing on the disc. "STATFS" inquires about the current status of the file system. "S
"ET_ATTR" changes the attribute of the currently open file. "SEARCH_DISCON" checks whether there is a discontinuous boundary (zone boundary) in the specified section,
Returns TRUE if there is, FALSE otherwise.

"MERGE" merges two AV files on a disc with data in a memory. "SPLI
"T" divides the AV file on the disc into two AV files. "SHORTEN" deletes an end of the AV file on the disc and deletes an unnecessary part of the AV file.

"REPLACE" replaces a part of the AV file with the data in the memory. By combining these commands, the AV data recording unit 110,
The AV data editing unit 120 and the AV data reproducing unit 130
Realizes processing such as recording, editing, and playback.

(3) Recording / Reproduction Next, in the DVD recorder 10, recording of an AV file, recording of an AV data management file, reproduction of AV data, reproduction from a specified time to a specified time, and special reproduction of AV data will be described in detail. Will be described.

(3-1) Recording Processing of AV File Recording processing includes manual recording and scheduled recording. Manual recording refers to a recording process that is started immediately after setting a few items when the “record” key on the remote control is pressed by the user without setting a reservation time. Scheduled recording refers to a recording process when a start time and an end time are set in advance. For example, when the user presses a record button on the remote controller 6, a guidance image 200 as shown in FIG. 18 is displayed on the display 12 under the control of the recording / editing / playback control unit 105. When the user presses “1” or “select” in the guidance image 200, a guidance image 201 for setting recording conditions (in this example, recording time and recording quality) is displayed. The user sets the recording condition “recording time” by moving the focus to “unlimited” or “specified time” using the cursor button of the remote controller 6 and pressing the “select” button again. When “specified time” is selected, the display is switched to a guidance image for inputting time using the numeric keypad. When the setting of the designated time is completed, the guidance image 201 is displayed again.

The "recording quality" of the recording condition includes three types of bit rate and resolution of MPEG data: high image quality, standard, and time priority. Each (bit rate, resolution) is (6 Mbps, 720 * 480 pixels) for high image quality, (3 Mbps, 360 * 480 pixels) for standard,
Time priority (1.5Mbps, 360 * 240 pixels)
It is. Now, as a case of recording, the guidance image 20
It is assumed that “unlimited” and “time priority” are selected in 1 and the “recording” button on the remote control is pressed after shifting to the guidance image 202. As a result, the recording / editing / playback control unit 105 instructs the AV data recording unit 110 to record,
Recording processing is started in the data recording unit 110.

FIGS. 19 and 21 show the AV data recording unit 11.
11 is a flowchart showing a recording process at 0. In the case of manual recording, the notification of pressing the “Record” button is
This is performed by the recording / editing / playback control unit 105 via the / F unit 106. Recording / editing / playback control unit 1 receiving this notification
Reference numeral 05 secures a continuous recording area of a certain size (about 7 Mbytes) or more. That is, an unused continuous sector area is searched by referring to the space bitmap and the continuous recording area management file, and a new continuous recording area is secured (step 220). At this time, if there is already recorded AV data, and if the AV data to be recorded from now on is logically continuous, a new continuous recording area is secured so as to be connected to the existing continuous recording area as much as possible. .

Further, a recording / editing / playback control unit 105
Notifies the AV data input unit 111 of the file identifier and the parameter indicating the time priority set in the recording condition. The AV data input unit 111 starts the encoding of the video data and the audio data of the program of the specific channel being received via the receiver 9 by the MPEG encoder 2, and further transfers the encoded MPEG data to the track buffer 3a. Is started (step 221).

Next, the recording / editing / playback control unit 105
Indicates to the common file system unit 104 "CREAT" including designation of a newly allocated continuous recording area.
An "E" command is issued (step 222). In response to this, if a file can be created in a new continuous recording area, the common file system unit 104 returns a new file identification descriptor. At the same time, the AV data input unit 1
11 issues an “OPEN” command to the AV file system unit 103 (step 223), and thereby stores information on the file identification descriptor and its file entry given from the recording / editing / playback control unit 105 in the work memory ( (Not shown) (hereinafter, the above information in the work memory is abbreviated as Fd (file descriptor)).

The AV data input unit 111 records, edits,
Until the stop command is received from the reproduction control unit 105 (step 224), the number of packs constituting the VOBU and the number of packs of the first reference image (I picture) of the VOBU are represented by GOP every time the VOBU is encoded. The information is stored in the main memory 1d (steps 226 and 227). FIG. 20 shows an example of GOP information. In the figure, VOBU #
The GOP information stored in the main memory 1d at the time when the encoding is performed up to 20 is shown. In this embodiment, one VOBU has 15 frames (or 30 fields).
And about 0.5 seconds of video data.

Here, VO for VOBU for TMU
When the BU table is recorded collectively (FIG. 19),
The AV data input unit 111 notifies the AV file management information generation unit 112 of the GOP every time a fixed amount of MPEG data is accumulated in the track buffer 3a or when the amount of TMU has elapsed (step 228). Information is passed to the AV file management information generation unit 112 (step 2
29). After that, the GOP information on the memory (main storage 1d) is cleared, but the GOP information recording address generated by the AV file management information generation unit 112 is stored in the memory (main storage 1d).
d) It is held above (step 230).

Further, the AV data input section 111 issues a "WRITE" command to the AV file system section 103 every time a fixed amount of MPEG data is accumulated in the track buffer 3a (steps 231 and 232). Here, it is assumed that the “WRITE” command is issued to the AV file system unit 103 together with designation of three parameters. The three parameters are the Fd opened by the “OPEN” command, the size of the data to be recorded, and the buffer that holds the data (the track buffer 3a in the present embodiment). Also, Fd specified as a parameter includes information indicating the extent recording position and extent length, similarly to the file entry. This information indicates the continuous recording area secured in step 220.

Further, when a plurality of “WRITE” commands are issued from the time when the Fd is opened until the time when the Fd is closed, the Fd is sequentially updated. The second and subsequent “WRIT
In the "E" command, new data is added following the already recorded data. The AV data input unit 111
When a stop command is received, a "WRITE" command (steps 231 and 232) is issued, and "CLOSE"
A command is issued (step 233), the AV file management information generating unit 112 is notified that the recording of the AV file (VOB) has been completed (step 234), and the processing ends. The “WRITE” command in step 232 is for recording the remaining track buffer.

Further, the last VOB is stored in the VOBU table.
When recording the data size and playback time of U and the data size, playback time and reference image size of its own VOBU (FIG. 21), the AV data input unit 111 stores a fixed amount of MPEG data in the track buffer 3a. At the time when the data is stored (step 235), the fact is notified to the AV file management information generation unit 112, and the GOP information is passed to the AV file management information generation unit 112 (step 229). Thereafter, the GOP information on the memory (main storage 1d) is cleared, but a part of the time map table generated by the AV file management information generation unit 112 is held on the memory (main storage 1d) (step 230). ).

Further, the AV data input section 111 issues a "WRITE" command to the AV file system section 103 every time a fixed amount of MPEG data is accumulated in the track buffer 3a (steps 231 and 232). Here, it is assumed that the “WRITE” command is issued to the AV file system unit 103 together with designation of three parameters. The three parameters are the Fd opened by the “OPEN” command, the size of the data to be recorded, and the buffer that holds the data (the track buffer 3a in the present embodiment). Also, Fd specified as a parameter includes information indicating the extent recording position and extent length, similarly to the file entry. This information indicates the continuous recording area secured in step 220.

When a plurality of "WRITE" commands are issued from the time when the Fd is opened until the time when the Fd is closed, the Fd is sequentially updated. The second and subsequent “WRIT
In the "E" command, new data is added following the already recorded data. The AV data input unit 111
When a stop command is received, a "WRITE" command (steps 231 and 232) is issued, and "CLOSE"
A command is issued (step 233), the AV file management information generating unit 112 is notified that the recording of the AV file (VOB) has been completed (step 234), and the processing ends. The “WRITE” command in step 232 is for recording the remaining track buffer.

The AV data input unit 111 receives the “WRITE” command (step 231
232), and further issues a “CLOSE” command (step 233), and notifies the AV file management information generating unit 112 that recording of the AV file (VOB) has been completed (step 234). The “WRITE” command in step 232 is for recording the remaining track buffer.

Although the case of manual recording has been described with reference to FIGS. 19 and 21, in the case of scheduled recording, a notice of pressing of the “recording” button is notified via the user I / F unit 106 together with notification of the time designated as the reservation. Recording / editing / playback control unit 1
05. The recording / editing / playback control unit 105 secures a continuous recording area corresponding to the designated time.

(3-2) Generation of AV File Management Information
Recording FIGS. 22 and 23 show the AV file management information generation unit 112.
9 is a flowchart showing a process of generating and recording AV file management information according to the first embodiment. As shown in FIG. 22, when the AV file management information generation unit 112 collectively records the VOBU tables for the VOBUs for the TMU, when receiving the notification that the recording of the VOBUs for the TMU is completed (step 251), the AV file management information generation unit 112 receives the notification. Based on the GOP information stored in the memory (main storage 1d) by the data input unit 111,
The VOB information (a) VOBU table and (b) time map table are generated as follows (step 252).

(A) VOBU table (VO for TMU)
Reference image size for BU, VOBU playback time, VO
(BU size) The GOP information shown in FIG. 20 represents the reference image size of the VOBU table for the VOBU for the TMU, and the value of the VOBU size itself. To generate a VOBU table. In the present embodiment, the reproduction time of the VOBU is 15 frames (or 30 fields), so that it is 0.5 seconds (15 frame times). However, since the last VOBU of the AV file has a different reproduction time, the AV file management information generation unit 112 obtains it from the AV data input unit 111 and sets it in the VOBU table. After the VOBU table is generated in this manner, the VOBU table is recorded in a portion previously vacated in the data area, and the head recording address (VOBU_T_ADR) is recorded in the main memory 1d.

(B) Time map table (VOBU map address, time difference TM_DIFF, VOBU address) The AV file management information generation unit 112 checks each VOBU_T
By calculating _ADR, VOB of each time map
The U map address is obtained, and (VOBU_T_ADR corresponding to the TMU)-(VOMU_T_ADR corresponding to the TMU) is calculated by the time difference TM.
Obtain as _DIFF. The VOBU address is
VOBUs up to each “VOBU map number” are added to the start address of the continuous recording area obtained from the AV data input unit 111.
It is calculated by sequentially adding the sizes.

If the AV data management file already exists, the AV file management information generation unit 112 issues an OPEN command and a READ command to the file system unit 102 to read the AV data management file. The acquired time map table is acquired (step 253), and the generated time map table is recorded in the main memory 1d (step 254). The VOBU table is written (step 255). However, when the control data management unit 107 holds the AV data management file, the AV data management file may not be read.

By repeating this, the AV data input unit 111
Receives a notification that the recording of the AV file has been completed (step 256), the information stored in the memory (main storage 1d) by the AV data input unit 111 and the new continuous recording area in which the AV file has been recorded. VOB information (c) based on the VOBU number corresponding to the start address
VOB general information and time map information ((d) time map general information) are generated as follows (step 25).
7).

(C) VOB general information (VOB identifier, VOB
(OB playback time) The AV file management information generation unit 112 assigns a unique VOB identifier (the next number or the like) if the control data management unit 107 holds the existing AV file management table, and if the control table is not held, , VOB # 1 as the VOB identifier, obtains the playback time of the AV file from the AV data input unit 111, and generates VOB general information including the playback time.

(D) General Time Map Information (Number of Time Maps, Number of VOBU Maps, TM_OFS) The AV file management information generation unit 112 sets the TMU to, for example, 10 seconds, divides the reproduction time of the VOB by the TMU, and Is obtained, the number of VOBUs obtained from the GOP information is set as the number of VOBU maps, and TM_OFS is set to 0 (in the case of new recording). After the above is completed, the AV file management information generation unit 112 generates PGC information of the title recorded by the AV data input unit 111 (step 2).
57) Update the acquired AV data management file by adding the VOB information and PGC information generated in step 257 (step 258), and record the updated AV data management file in the file system unit 102. A WRITE command and a CLOSE command are issued (step 259), and the AV file management information generation processing ends.

Further, the last VOB is stored in the VOBU table.
FIG. 23 shows a process of generating and recording AV file management information by the AV file management information generation unit 112 when recording the data size and reproduction time of U and the data size, reproduction time and reference image size of its own VOBU. 4 shows a flowchart. As shown in the figure, when the AV file management information generation unit 112 receives a notification that the track buffer has exceeded a certain amount (step 260), the AV file
Based on the GOP information stored in the memory (main storage 1d) by the data input unit 111, the VOB information (a) V
An OBU table is generated as follows (step 25)
2).

(A) VOBU table (VO for TMU)
Reference image size for BU, VOBU playback time, VO
(BU size) The GOP information shown in FIG. 20 represents the value of the reference image size of the VOBU table and the VOBU size itself for one VOBU.
12 generates a VOBU table by adding the playback time of each VOBU to the GOP information. In the present embodiment, the reproduction time of the VOBU is 15 frames (or 30 fields), so that it is 0.5 seconds (15 frame times). However, since the last VOBU of the AV file has a different reproduction time, the AV file management information generation unit 112 obtains it from the AV data input unit 111 and sets it in the VOBU table. After generating the VOBU table in this way,
The start recording address (VOBU_T_ADR) and the VOBU playback time are recorded in the main memory 1d in the data area (in the RDI pack).

(B) Time map table (VOBU map address, time difference TM_DIFF, VOBU address) The AV file management information generation unit 112 sequentially adds the VOBU playback times of the VOBU table recorded in the main memory 1d, and adds Every time the value becomes almost an integral multiple of TMU, the VOBU existing at that time is obtained, thereby obtaining the VOBU map number of each time map.
(Integral multiple of TMU)-(addition value) is converted to time difference TM_DIF
Obtain as F. The VOBU address is calculated by sequentially adding the VOBU size up to each “VOBU map number” to the start address of the continuous recording area obtained from the AV data input unit 111. The time map table generated in this way is recorded in the main memory 1d, and the VOBU_T_ADR and VOBU playback time on the main memory 1d are cleared.

If the AV data management file already exists, the AV file management information generation unit 112 issues an OPEN command and a READ command to the file system unit 102 to read the AV data management file, and reads the AV data management file. The acquired time map table is acquired (step 253) and recorded in the main memory 1d (step 254). The VOBU table is written (step 255). However, when the control data management unit 107 holds the AV data management file, the AV data management file may not be read. This is repeated, and when the notification that the recording of the AV file is completed is received from the AV data input unit 111 (step 25).
6) The information stored in the memory (main storage 1d) by the AV data input unit 111 and the VOBU corresponding to the start address of the new continuous recording area where the AV file is recorded
Based on the numbers, VOB information (c) VOB general information and time map information ((d) time map general information) are generated as follows (step 257).

(C) VOB general information (VOB identifier, V
(OB playback time) The AV file management information generation unit 112 assigns a unique VOB identifier (the next number or the like) if the control data management unit 107 holds the existing AV file management table, and if the control table is not held, , VOB # 1 as the VOB identifier, obtains the playback time of the AV file from the AV data input unit 111, and generates VOB general information including the playback time.

(D) General time map information (number of time maps, number of VOBU maps, TM_OFS) The AV file management information generation unit 112 sets the TMU to, for example, 10 seconds, divides the playback time of the VOB by the TMU, and calculates the number of time maps. Is obtained, the number of VOBUs obtained from the GOP information is set as the number of VOBU maps, and TM_OFS is set to 0 (in the case of new recording). After the above is completed, the AV file management information generation unit 112 generates PGC information of the title recorded by the AV data input unit 111 (step 2).
57) Update by adding the plurality of precision VOB information and PGC information generated in step 257 (step 258), and in order to record the updated AV data management file, WRITE command and CLOSE command are sent to the file system unit 102. Is issued (step 259),
The AV file management information generation processing ends.

(3-3) Playback of AV Data In the playback process, when the user presses “2” or “select” on the guidance image 200 shown in FIG. Pressing "select", the recording / editing / playback control unit 105 notifies the AV data playback unit 130 of the title. Thus, the reproduction of the title A starts.

FIGS. 24 and 25 show the AV data reproducing unit 13.
7 is a flowchart showing a normal reproduction process content at 0. Here, (A) VO for VOBU for TMU
The BU table is collectively recorded (FIG. 24).
(B) In the VOBU table, the data size and playback time of the immediately preceding VOBU, and the data size, playback time and reference image size of its own VOBU are recorded (FIG. 25).
The case will be described.

(A) VOB for VOBU for TMU
When the U tables are recorded together, the AV data reproducing unit 130 in FIG.
07 with reference to the AV data management file held in
PGC information and VOB information are acquired from the notified title name (step 281). Further, the AV data reproducing unit 130 specifies an AV file indicated by the VOB information.
A PEN command is issued to the file system unit 102 (step 282). Further, the AV data reproducing unit 130
Corresponds to the number of cells set in the PGC information in step 28
The title A is reproduced by repeating the loop processing from 3 to 291.

That is, the AV data reproducing unit 130 refers to the VOBU table in the data area by referring to the time map information, and sets the start time (sector address) and the end address of the cell start time and end time, respectively. (Step 284), and issues a READ command to the file system unit 102 by designating them. Thereby, the disk reading unit 10
Reading of the data section of the VOB indicated by the cell is started by 1. At this time, if the number of VOBUs exceeds the VOBU for the TMU, the VOBU table for the next TMU is referred to (step 293), and the VOBUs are sequentially read.

Thereafter, until the reading of the cell is completed, the AV data reproducing section 130 keeps reading the AV data every time a certain amount of AV data is accumulated in the track buffer 3a.
The data is decoded (steps 286 to 288).
When the cell reading by the disk reading unit 101 is completed, the AV data reproducing unit 130 decodes the data stored in the track buffer 3a and ends the reproduction of the cell (Step 289). Thus, P
After decoding of all cells in the GC information is completed, the AV data reproducing unit 130
02, a CLOSE command is issued, and the reproduction process ends.

(B) The immediately preceding VOB is stored in the VOBU table.
When the data size and playback time of U and the data size, playback time and reference image size of its own VOBU are recorded, the AV data playback unit 130 in FIG. With reference to the data management file, PGC information and VOB information are acquired from the notified title name (step 281). Further, the AV data reproducing unit 130 issues an OPEN command specifying the AV file indicated by the VOB information to the file system unit 102 (Step 282). Furthermore, AV
The data reproducing unit 130 reproduces the title A by repeating the loop processing of steps 283 to 291 by the number of cells set in the PGC information.

That is, the AV data reproducing section 130 refers to the VOBU table in the data area by referring to the time map information, and sets the start time and end time of the cell as the start address (sector address) and the end address, respectively. (Step 284), and issues a READ command to the file system unit 102 by designating them. Thereby, the disk reading unit 10
Reading of the data section of the VOB indicated by the cell is started by 1. At this time, the VOBU table is sequentially read from the data area, and the VOBUs are sequentially read by referring to the VOBU table.

Thereafter, the AV data reproducing unit 130 keeps reading the AV data every time a certain amount of AV data is accumulated in the track buffer 3a until the reading of the cell is completed.
Decode the data (Step 286, Step 2
88). When the cell reading by the disk reading unit 101 is completed, the AV data reproducing unit 130 decodes the data stored in the track buffer 3a and ends the reproduction of the cell (Step 289). After decoding of all cells in the PGC information is completed in this way, the AV data reproducing unit 130 issues a CLOSE command to the file system unit 102, and ends the reproducing process.

(3-4) Reproduction from the Specified Time to the Specified Time In the reproduction from the specified time to the specified time, in the guidance image 205 shown in FIG. Means reproduction when arbitrarily specified. Here, (A) VOBU tables for VOBUs for TMU are collectively recorded (FIG. 2).
6), (B) The VOBU table records the data size and playback time of the immediately preceding VOBU and the data size, playback time and reference image size of its own VOBU (FIG. 2).
7), the case will be described.

(A) VOB for VOBU for TMU
11 is a flowchart showing a reproduction process when a start time and an end time in a title are designated by a user when the U tables are collectively recorded. In FIG. 26, the AV data reproducing unit 130 includes a control data management unit 1
07 with reference to the AV data management file held in
PGC information and VOB information are acquired from the notified title name (step 311).

[0120] The AV data reproducing section 130 refers to the time map information to determine the start time and the end time specified by the user, so that the VOB in the corresponding data area can be determined.
With reference to the U table, the data is converted into a start address and an end address (step 312).
An OPEN command specifying the AV file indicated by the OB information is issued to the file system unit 102 (step 31).
3) Then, a READ command is issued to the file system unit 102 to read the start address and end address obtained by the conversion (step 314). This allows
The reading of the data section of the specified VOB by the disk reading unit 101 is started. Where V for TMU
If it exceeds the OBU, the VOBU table for the next TMU is referred to (step 321), and the VOBUs are sequentially read.

Thereafter, the AV data reproducing section 130 decodes the AV data every time a fixed amount of AV data is accumulated in the track buffer 3a until the reading of the data section is completed (step 315). ~ 31
7). When the reading by the disk reading unit 101 is completed, the AV data reproducing unit 130 decodes the data stored in the track buffer 3a (step 31).
9) Then, a CLOSE command is issued to the file system unit 102 (step 320), and the reproduction process ends.

(B) The previous VOB is stored in the VOBU table.
In the case where the data size and playback time of U and the data size, playback time and reference image size of its own VOBU are recorded, the playback process when the start time and end time in the title are specified by the user is shown. 4 shows a flowchart. In FIG. 27, the AV data reproducing unit 130 acquires PGC information and VOB information from the notified title name with reference to the AV data management file held in the control data management unit 107 (step 311).

The AV data reproducing unit 130 determines the start time and the end time specified by the user by referring to the time map information, and the VOB in the corresponding data area.
With reference to the U table, the data is converted into a start address and an end address (step 312).
An OPEN command specifying the AV file indicated by the OB information is issued to the file system unit 102 (step 31).
3) Then, a READ command is issued to the file system unit 102 to read the start address and end address obtained by the conversion (step 314). This allows
The reading of the data section of the specified VOB by the disk reading unit 101 is started. At this time, the VOBU table is sequentially read from the data area, and the VOBUs are sequentially read by referring to the VOBU table.

Thereafter, the AV data reproducing section 130 decodes the AV data every time a fixed amount of AV data is accumulated in the track buffer 3a until the reading of the data section is completed (step 315). ~ 31
7). When the reading by the disk reading unit 101 is completed, the AV data reproducing unit 130 decodes the data stored in the track buffer 3a (step 31).
9) Then, a CLOSE command is issued to the file system unit 102 (step 320), and the reproduction process ends.

(3-5) Special reproduction of AV data Special reproduction is started when the “fast forward” or “rewind” key of the remote controller 6 is pressed during reproduction, and then when the “reproduction” key is pressed. To the original playback. FIG.
5 is a flowchart showing a special reproduction process performed by the AV data reproducing unit 130.

When the recording / editing / reproduction control unit 105 notifies the recording / editing / reproduction control unit 105 that the “fast-forward” or “rewind” key is pressed during the reproduction, the AV data reproduction unit 130 sets the skip time Δt for the special reproduction. It is set (step 341). For example, in the case of the "fast forward" key, +1 second, "rewind"
In the case of a key, it is -1 second. Further, when it is notified that the “fast-forward” or “rewind” key has been pressed during the trick play, the skip time may be further increased such that Δt is further increased by +1 second or −1 second. Furthermore, AV
The data reproducing unit 130 stops the MPEG decoder 4, acquires the time ts from the MPEG decoder 4, and clears the track buffer 3a (steps 342 to 34).
4). Next, the AV data reproducing unit 130 sets the time t until the special reproduction end instruction (for example, the “reproduction” key is pressed).
Each time s is updated by the skip time Δt, step 34
The processing from 5 to 356 is performed.

If the updated time ts does not exceed the end time of the cell being reproduced, the AV data reproducing unit 130 refers to the VOBU table in the data area by referring to the time map information, and Is specified (step 350), the start address is calculated from the time map and the VOBU map, and the reference image size of the specified VOBU map is read (step 351). If the updated time ts exceeds the end time of the cell being reproduced and the next cell exists, the AV data reproducing unit 130 updates ts so that it is after the start time (step S1). 347-349). Here, in the VOBU table, the data size and reproduction time of the immediately preceding VOBU, and the own VOB
If the data size, playback time, and reference image size of U are recorded, Δt is a negative value, and if the value is relatively small, the previous VOBU in the current VOBU table
It is assumed that the VOBU corresponding to the updated ts is specified by referring to the data size and the VOBU playback time.

Further, the AV data reproducing unit 130 issues a SEARCH_DISCON command to the file system unit 102 together with designation of a data section corresponding to the reference image size from the obtained start address (step 352). This is for checking whether the recording area of the reference image does not straddle a discontinuous boundary such as a zone boundary (continuous area or discontinuous area). If discontinuous (step 353), the AV data reproducing unit 130 obtains a VOBU map adjacent to the specified VOBU (step 354), and reads out the start address and the reference image size (step 355). AV data reproducing unit 130
Issues a READ command to the file system unit 102 together with the obtained start address and reference image size designation (step 356). Thereby, the reference image data is stored in the track buffer 3a. The reference image data stored in the track buffer 3a is reproduced by the MPEG decoder 4.

The above processing is repeated while updating the time ts by the skip time Δt until the end of the special reproduction is instructed. When there is an instruction to end trick play (step 3
57), the AV data reproducing unit 130 sets the time ts as the start time and performs the original reproduction process (step 283 in FIG. 24 or step 283 in FIG. 25, or step 312 in FIG. 26).
Alternatively, the process returns to step 312 in FIG. 27 (step 35).
8). As described above, in the special reproduction, the address of the reference image existing for each skip time can be sequentially obtained according to the time map information. In addition, the time map information associates the reproduction times and recording positions (sector addresses) of all VOBUs with hierarchical time map information of a time map table and a VOBU table. Sector address), the data volume is very small,
Therefore, it is easy to generate it in real time during recording.

In the above embodiment, as shown in FIG. 12, the DVD recorder 10 has a configuration on the assumption that the DVD recorder 10 can be used in place of a conventional stationary home VTR.
Not limited to this configuration, when the DVD-RAM is also used as a recording medium of a computer, the following configuration may be adopted. That is, the disk access unit 3
A D-RAM drive is connected to a computer bus via an IF called SCSI or IDE. Components other than the disk access unit 3 are realized by executing an OS and application programs on hardware of a computer. In that case, the disk recording unit 100, the disk reading unit 101, and the file system unit 102 are mainly functions of the OS or the OS.
Is implemented as an application that expands the function of, and the other components are implemented mainly as functions of an application program. Various commands supported by the file system unit 102 correspond to service commands such as system calls provided to the application.

In the above embodiment, one VOB is recorded in each AV file. However, a plurality of VOB data may be recorded in one AV file. In this case, the AV data management file (VR_MANGR.I
FO), for example, individual VOs in each AV file
The size of B or the offset address from the beginning of the file may be recorded and managed.

[0132]

An information recording medium according to the present invention is an information recording medium having a data area and a time map area, wherein the data area includes a video object comprising a plurality of video object units including at least one picture. Is recorded in the time map area, a first table in which information on a reproduction time of the video object is stored, a time offset indicating an offset of the reproduction time, and an address offset with respect to a recording address of the object. The first table includes identification information of a video object unit including a picture to be reproduced at each reproduction time corresponding to each reproduction time at a predetermined time interval, and a recording address on the information recording medium. The reproduction time and the first table at the predetermined time interval are The difference between the start time of the video object unit and the start time of the video object is recorded in the time offset. In the address offset, information indicating a difference between a recording address at a head of the video object and an address of a head of the data area is recorded, and in the data area, information on a reproduction time of the video object is stored. A second table is recorded, and the second table has a reproduction time, a data size, and a first reference picture in each video object unit corresponding to each of the plurality of video object units. Has a data size of Characterized in that it is recorded.

Here, the second table contains, for each video object unit, the reproduction time of the immediately preceding and own video object units, the data size of the immediately preceding and own video object units, and the data size of the own video object units. The data size of the first reference picture may be recorded.

According to this configuration, since the first table only records the difference between the recording address of the video object unit, the identification information, and the time at regular intervals, the table size is small. The second table does not need to record the recording position (sector address) corresponding to the reproduction time for each video object unit, and includes the reproduction time and the data size for each video object unit. The data size may be shorter, and the table size is smaller. Furthermore, since the second table is generated for each video object unit based on the unit to be encoded, it is very easy to generate the second table in real time during recording. Also, the time map information is obtained by hierarchically searching the first table and the second table to associate the playback time of the video object with the address. There is an effect that it may be less. In addition, by recording the second table in the data area, it is possible to reduce the memory capacity required for the recording device and the playback device.

Further, the recording apparatus of the present invention is an apparatus for recording video data on an information recording medium, and has at least an input means for receiving an input of video data to be recorded, and at least Compression means for generating a video object consisting of a plurality of video object units including one picture, writing means for writing data on the information recording medium, and control means for controlling the writing means, the control means comprising: Controlling the writing means to write the video object in the data area of the information recording medium, and identifying a video object unit including a picture to be reproduced at each reproduction time, corresponding to each reproduction time at a predetermined time interval. Information, a recording address on the information recording medium, and the certain time Generating a first table in which the difference between the playback time of the interval and the start time of the video object unit indicated by the first table is stored; A second table in which time, data size, and data size of the first reference picture in each video object unit are stored is generated. And generating an address offset indicating a difference between a recording address at the head of the video object and an address of the head of the data area. Table and time off Write a Tsu bets and the address offset, and controlling the write means to write the second table in the data area of the information recording medium.

Here, at the time of generating the second table, the control means determines, for each video object unit, the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, and May be configured to generate a second table in which the data size of the first reference picture of the video object unit is stored.

[0137] Further, a reproducing apparatus of the present invention is an apparatus for reproducing a video object recorded on the information recording medium, wherein the reproducing means reads data from the information recording medium and the reproducing means reproduces a video object. Control means for controlling the reading means and the reproducing means, wherein the control means receives an input of a reproduction start time, and reads the first table, the time offset and the address offset. By referring to the read first table, the time offset, and the address offset to specify a group of video object units including a picture to be reproduced at the reproduction start time, and Before reading the second table included in the object unit group By controlling the reading means and referring to the read second table, a video object unit including a picture to be reproduced at the reproduction start time is specified, and reproduction is started based on the specified video object unit. The reading means and the reproducing means are controlled so as to be controlled.

Here, the control means receives the reproduction start time, and receives the second table recorded in the data area, the first table recorded in the time map area, the time offset and the address offset. Controlling the reading means to read the video object unit including the picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset. The read means is controlled to read the specified and second table included in the specified video object unit, and includes the picture to be reproduced at the reproduction start time by referring to the read second table. Identify the video object unit and identify the identified video object. Ekutoyunitto may be configured to control said reading means and the reproducing means so that reproduction is started on the basis of.

According to this configuration, since the first table only records the difference between the recording address of the video object unit, the identification information, and the time at regular intervals, the table size is small. The second table does not need to record the recording position (sector address) corresponding to the reproduction time for each video object unit, and includes the reproduction time and the data size for each video object unit. The data size may be shorter, and the table size is smaller. Furthermore, since the second table is generated for each video object unit based on the unit to be encoded, it is very easy to generate the second table in real time during recording. Also, the time map information is obtained by hierarchically searching the first table and the second table to associate the playback time of the video object with the address. There is an effect that it may be less. In addition, by recording the second table in the data area, it is possible to reduce the memory capacity required for the recording device and the playback device.

Further, the program storage medium of the present invention stores a computer-readable program storing a program for a recording apparatus for recording a video object comprising a plurality of video object units including at least one picture on an information recording medium. A medium,
The program includes a step of writing the video object in a data area of the information recording medium, and identifying information of a video object unit including a picture to be reproduced at each reproduction time, corresponding to each reproduction time at a fixed time interval. Generating a first table in which a recording address on the information recording medium and a difference between a reproduction time at the predetermined time interval and a start time of a video object unit indicated by the first table are stored; For each of the plurality of video object units, the playback time of the plurality of video object units,
Generating a second table in which the data size and the data size of the first reference picture in each video object unit are stored; and calculating the playback time at the beginning of the video object and the playback time at the fixed time interval. Generating a time offset indicating a difference time; generating an address offset indicating a difference between a recording address at a head of the video object and an address of a head of the data area; and generating a time offset in a time map area of the information recording medium. Writing the first table, the time offset and the address offset, and writing the second table to a data area of the information recording medium by a computer.

Here, for each of the video object units, the program executes the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, and the reference of the head of the own video object unit. The step of generating the second table in which the data size of the picture is stored may be configured to be executed by a computer.

Further, the program storage medium of the present invention comprises: a reading means for reading data from the information recording medium;
A computer-readable recording medium having recorded thereon a program for a reproducing apparatus comprising: a reproducing unit that reproduces a video object, wherein the program includes a step of receiving an input of a reproduction start time; Controlling the reading means to read the time offset and the address offset; and by referring to the read first table, the time offset and the address offset,
Specifying a video object unit including a picture to be reproduced at the reproduction start time, and reproducing at the reproduction start time by referring to the read first table, the time offset, and the address offset Specifying a group of video object units including a picture to be read, reading a second table included in the specified group of video object units, and referring to the read second table to determine the reproduction start time. Causing a computer to execute a step of specifying a video object unit including a picture to be reproduced, and a step of reading and controlling the reading unit and the reproducing unit to start reproduction based on the specified video object unit. To And butterflies.

Here, the program specifies the video object unit including the picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset. Reading the second table included in the specified video object unit, and referencing the read second table to determine the video object unit including the picture to be reproduced at the reproduction start time. The computer may be configured to execute a specifying step and a reading / reproducing step for controlling the reproducing means so as to start reproduction based on the specified video object unit.

According to this configuration, since the first table only records the difference between the recording address of the video object unit, the identification information, and the time at fixed time intervals, the table size is small. The second table does not need to record the recording position (sector address) corresponding to the reproduction time for each video object unit, and includes the reproduction time and the data size for each video object unit. The data size may be shorter, and the table size is smaller. Furthermore, since the second table is generated for each video object unit based on the unit to be encoded, it is very easy to generate the second table in real time during recording. Also, the time map information is obtained by hierarchically searching the first table and the second table to associate the playback time of the video object with the address. There is an effect that it may be less. In addition, by recording the second table in the data area, it is possible to reduce the memory capacity required for the recording device and the playback device.

[Brief description of the drawings]

FIG. 1 is a diagram showing an appearance and a recording area of a DVD-RAM disc which is a recordable optical disc according to an embodiment of the present invention.

FIG. 2A shows zone areas 0 to 0 in a DVD-RAM.
(B) Explanatory diagram in which zone areas 0 to 23 and others are arranged in the horizontal direction. (C) Logical sector number (LS) in volume space
(D) Logical block number (LB) in volume space
Figure showing N)

FIG. 3 is a diagram hierarchically showing a relationship between a sector and an ECC block in a zone area;

FIG. 4 is a diagram showing a space bitmap recorded in a volume space and a continuous recording area management file.

FIG. 5 is a diagram showing a hierarchical directory structure of an AV file and a non-AV file.

FIG. 6 shows an AV data management file (VR_MANGR.
Explanatory diagram hierarchically showing recorded contents of an IFO)

FIG. 7 is an AV file management table, PG, for recording VOBU tables for TMUs together in a data area.
The figure which shows the logical connection relationship between C information table and VOB

FIG. 8 shows, in a VOBU table, the data size and reproduction time of the immediately preceding VOBU, the data size of its own VOBU,
FIG. 6 is a diagram showing a logical connection relationship between an AV file management table, a PGC information table, and a VOB when recording a reproduction time and a reference image size.

FIG. 9 is a diagram showing a data structure of an AV file, that is, a VOB.

FIG. 10 is a diagram showing a more detailed data structure of time map information corresponding to one VOB;

FIG. 11 is a diagram showing a logical connection between a time map table and a VOBU table;

FIG. 12 is a diagram showing a configuration example of a system using an optical disc recording / reproducing apparatus according to the embodiment.

FIG. 13 is a block diagram showing a hardware configuration of the DVD recorder 10;

FIG. 14 illustrates an example of a remote controller.

FIG. 15 is a block diagram showing a configuration of an MPEG encoder 2.

FIG. 16 is a block diagram showing a configuration of an MPEG decoder 4.

FIG. 17 is a functional block diagram showing the configuration of the DVD recorder 10 by function.

FIG. 18 is a diagram showing a guidance image.

FIG. 19 is a flowchart showing a recording process in the case where a table is recorded in a plurality of times in the AV data recording unit 110;

FIG. 20 is a diagram showing an example of GOP information in the case of FIG. 18;

FIG. 21 is a flowchart showing a recording process in a case where a table having a plurality of accuracies is generated in the AV data recording unit 110 and a sufficient main memory 1d is provided.

FIG. 22 is an AV file management information generation unit 1 when collectively recording a VOBU table for TMU in a data area.
12 showing the generation and recording processing of the AV file management information by the H.12

FIG. 23 is a diagram illustrating the AV file management in the case where the data size and the reproduction time of the immediately preceding VOBU and the data size, the reproduction time and the reference image size of the own VOBU are recorded in the VOBU table and the main storage 1d is sufficient. Flowchart showing generation and recording processing of AV file management information by information generation unit 112

FIG. 24 is a flowchart showing the contents of normal reproduction processing when the VOBU tables for the TMU are collectively recorded in the data area in the AV data reproduction unit 130;

FIG. 25 shows a VOBU in the AV data reproducing unit 130.
Flowchart showing the contents of normal playback processing when the data size, playback time of the immediately preceding VOBU and the data size, playback time, and reference image size of its own VOBU are recorded in the table.

FIG. 26 is a flowchart showing a reproduction process when a start time and an end time in a title are designated by a user when a VOBU table for TMU is collectively recorded in a data area;

FIG. 27 shows a case where the data size and playback time of the immediately preceding VOBU and the data size, playback time and reference image size of its own VOBU are recorded in the VOBU table, and the start time and end time in the title are changed by the user. Flowchart showing playback processing when specified

FIG. 28 is a flowchart showing special reproduction processing performed by the AV data reproduction unit 130;

[Explanation of symbols]

 Reference Signs List 1 control unit 1a CPU 1b processor bus 1c bus interface 1d main memory 2,4 MPEG encoder 2a video encoder 2b, 4b video buffer 2c audio encoder 2d, 4d audio buffer 2e system encoder 2f, 4f STC unit 2g encoder control unit 3 disk access Unit 3a Track buffer 4a Demultiplexer 4c Video decoder 4e Audio decoder 4g Adder 4h-4j Selector 5 Video signal processing unit 6 Remote control 7 Bus 8 Remote control signal receiving unit 9 Receiver 10 DVD recorder 11 Antenna 12 Display 100 Disk recording unit 101 Disk reading Unit 102 file system unit 103 AV file system unit 104 common file system unit 105 Editing / playback control unit 106 User I / F unit 107 Control data management unit 110 AV data recording unit 111 AV data input unit 112 AV file management information generation unit 120 AV data editing unit 130 AV data playback unit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 5/93 H04N 5/93 Z (72) Inventor Shinichi Saeki 1006 Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazuhiko Nakamura 1006 Kazuma Kadoma, Kazuma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 5D044 AB05 AB07 BC06 CC04 DE03 DE12 DE38 DE39 DE49 DE53 DE58 5D110 AA17 AA27 AA29 DA01 DA11 DA17 DB03 DC05 DC15 DE02 DE04 DE06

Claims (14)

[Claims] 1. An information recording medium having a data area and a time map area, wherein the data area is recorded with a video object including a plurality of video object units including at least one picture; Records a first table in which information on the reproduction time of the video object is stored, a time offset indicating an offset of the reproduction time, and an address offset with respect to a recording address of the object. The identification information of a video object unit including a picture to be reproduced at each reproduction time corresponding to each reproduction time at a predetermined time interval, the recording address on the information recording medium, and the reproduction at the predetermined time interval. Time and video object pointed to by first table A difference from a start time of the knit is recorded, and the time offset records information indicating a difference time between a reproduction time at the head of the video object and a reproduction time at the head at the certain time interval, and the address In the offset, information indicating a difference between a recording address at the head of the video object and an address of the head of the data area is recorded. In the data area, information on a reproduction time of the video object is stored. A table is recorded. In the second table, a reproduction time, a data size, and a data size of a first reference picture in each video object unit are associated with each of the plurality of video object units. Is recorded That the information recording medium. 2. The second table contains, for each of the video object units, the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, and the head of the own video object unit. 2. The information recording medium according to claim 1, wherein the data size of the reference picture is recorded. 3. An apparatus for recording video data on an information recording medium, comprising: input means for receiving an input of video data to be recorded; and a plurality of video data including at least one picture by compressing the input video data. Compression means for generating a video object comprising a video object unit; writing means for writing data to the information recording medium; and control means for controlling the writing means. The control means includes a data area of the information recording medium. Controlling the writing means so as to write the video object to the video recording medium, and identifying information of a video object unit including a picture to be reproduced at each reproduction time corresponding to each reproduction time at a predetermined time interval; The recording address, the reproduction time at the predetermined time interval, and the first text Generating a first table in which a difference between the start time of the video object unit indicated by the table and the start time of the video object unit is stored. A second table storing a data size of a first reference picture in the video object unit; and a time offset indicating a difference time between a playback time at the beginning of the video object and the playback time at the fixed time interval. Generating an address offset indicating a difference between a recording address at the head of the video object and an address of the head of the data area; and generating the first table, the time offset, and the time offset in a time map area of the information recording medium. address A recording device for writing the offset and writing the second table in a data area of the information recording medium. 4. When the second table is generated, the control means determines, for each of the video object units, a reproduction time of the immediately preceding and own video object unit, a data size of the immediately preceding and own video object unit,
4. The recording apparatus according to claim 3, wherein a second table storing the data size of the first reference picture of the own video object unit is generated. 5. A recording method in a recording device for recording a video object comprising a plurality of video object units including at least one picture on an information recording medium, the step of writing the video object in a data area of the information recording medium. And identification information of a video object unit including a picture to be reproduced at each reproduction time, a recording address on the information recording medium, and the predetermined time interval corresponding to the reproduction times at the predetermined time intervals. Generating a first table in which the difference between the reproduction time of the video object unit and the start time of the video object unit indicated by the first table is stored; and, for each of the plurality of video object units, Playback time, data size, and each video Generating a second table in which the data size of the first reference picture in the object unit is stored; and a time indicating a difference time between the playback time at the beginning of the video object and the playback time at the fixed time interval. Generating an offset; generating an address offset indicating a difference between a recording address at the head of the video object and an address of the data area; and storing the first table in a time map area of the information recording medium. And a step of writing the time offset and the address offset, and a step of writing the second table in a data area of the information recording medium. 6. The recording method, wherein for each of the video object units, a reproduction time of the immediately preceding and own video object units, a data size of the immediately preceding and own video object units,
6. The recording method according to claim 5, further comprising the step of generating a second table in which the data size of the first reference picture of the own video object unit is stored. 7. An apparatus for reproducing a video object recorded on an information recording medium according to claim 1, wherein said reading means reads data from said information recording medium, said reproducing means reproduces a video object, and said reading. And a control means for controlling the reproducing means. The control means receives an input of a reproduction start time, and controls the reading means to read the first table, the time offset and the address offset. By referring to the read first table, the time offset, and the address offset, a video object unit group including a picture to be reproduced at the reproduction start time is specified, and the specified video object unit group is specified. The second included in
By controlling the reading means to read the table, and by referring to the read second table,
A playback apparatus for identifying a video object unit including a picture to be played back at the playback start time, and controlling the reading unit and the playback unit to start playback based on the identified video object unit. . 8. A video object unit including a picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset for the reproduction device. And controlling the reading means to read the second table included in the specified video object unit, and by referring to the read second table,
A video object unit including a picture to be reproduced at the reproduction start time is specified, and the reading unit and the reproduction unit are controlled so that reproduction is started based on the specified video object unit. The playback device according to claim 7. 9. A reproducing method in a reproducing apparatus, comprising: a read unit for reading data from the information recording medium according to claim 1; and a reproducing unit for reproducing a video object, wherein a step of receiving an input of a reproduction start time; Controlling the reading means to read the first table, the time offset, and the address offset; and starting the reproduction by referring to the read first table, the time offset, and the address offset. Identifying a video object unit group including a picture to be reproduced at a time; and a second video object unit group included in the identified video object unit group.
Reading the table, and referring to the read second table,
Specifying a video object unit including a picture to be reproduced at the reproduction start time; and reading and reproducing the read unit and the reproduction unit so as to start reproduction based on the specified video object unit. A reproducing method characterized by including: 10. A video object unit including a picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset for the reproduction method. Reading the second table included in the specified video object unit; and referencing the read second table.
Specifying a video object unit including a picture to be reproduced at the reproduction start time; and reading and reproducing the read unit and the reproduction unit so as to start reproduction based on the specified video object unit. The reproduction method according to claim 9, further comprising: 11. A computer readable program storage medium storing a program for a recording device for recording a video object comprising a plurality of video object units including at least one picture on an information recording medium, wherein the program is Writing the video object in a data area of the information recording medium; identifying information of a video object unit including a picture to be reproduced at each reproduction time, corresponding to each of the reproduction times at a fixed time interval; Generating a first table storing a recording address on an information recording medium and a difference between a reproduction time at the predetermined time interval and a start time of a video object unit indicated by the first table; Supports each video object unit Generating a second table storing the reproduction time, data size, and data size of the first reference picture in each video object unit; and reproducing time at the top of the video object. Generating a time offset indicating a time difference between the start time of the video object and a playback time of the head in the predetermined time interval; Writing the first table, the time offset and the address offset to a time map area of the information recording medium, and writing the second table to a data area of the information recording medium. To A program storage medium to be executed by a computer. 12. The program storage medium, for each of the video object units, the reproduction time of the immediately preceding and own video object unit, the data size of the immediately preceding and own video object unit, and the head of the own video object unit. The program storage medium according to claim 11, further comprising a step of generating a second table in which a data size of a reference picture is stored. 13. A computer readable program storage medium storing a program for a reproducing apparatus, comprising: reading means for reading data from the information recording medium according to claim 1; and reproducing means for reproducing a video object. Receiving the input of a reproduction start time; controlling the read means to read the first table; reading the time offset and the address offset; reading the first table; Identifying a video object unit including a picture to be reproduced at the reproduction start time by referring to the time offset and the address offset; and reading the first table, the time offset, and the address offset read out. Refer to Identifying a video object unit group including the picture to be reproduced on the reproduction start time, the second included in the specified video object unit group
Reading the table, and referring to the read second table,
Specifying a video object unit including a picture to be reproduced at the reproduction start time; and reading and reproducing the read unit and the reproduction unit so as to start reproduction based on the specified video object unit. A program storage medium to be executed by a computer. 14. A video object unit including a picture to be reproduced at the reproduction start time by referring to the read first table, the time offset, and the address offset for the program storage medium. Identifying; reading a second table included in the identified video object unit; and referencing the read second table.
Specifying a video object unit including a picture to be reproduced at the reproduction start time; and reading and reproducing the read unit and the reproduction unit so as to start reproduction based on the specified video object unit. 14. The program storage medium according to claim 13, which is executed by a computer.