JP3420225B2 - Optical disk, recording device, reproducing device, recording method, reproducing method, computer-readable recording medium - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk used for recording video data , a recording device, a reproducing device, and a recording device.
Method, playback method, computer read recording program
The present invention relates to a recordable recording medium.

[0002]

2. Description of the Related Art In recent years, CD-ROM, DVD (Digital
A recording medium typified by an optical disc 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 a secondary storage of a computer. Furthermore, as a next-generation recordable recording medium, a DVD-RAM disk (hereinafter abbreviated as DVD-RAM) is desired to be put into practical use.

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

Therefore, in the DVD-ROM, a technique of recording information for special reproduction everywhere in the AV data is adopted. Specifically, AV data is compression-coded according to MPEG2 and is a section (called GOP) that is 0.4 seconds or more and 1.0 seconds (1.2 seconds at the end of VOB exceptionally) or less. Information unique to the DVD called an NV pack is added to the beginning of each GOP. In addition,
The data from the NV pack to the next NV pack is V
It is called OBU (abbreviation of Video OBject Unit).

The NV pack has a size of 2 Kbytes, and information for referring to a neighboring NV pack and GOP are included.
The data size of the first reference picture in is recorded. Here, the information for referring to the neighboring NV packs is the address of the NV packs of the forward and backward VOBUs which are separated by a certain time interval based on the time code at the beginning of the VOBU, It is shown as a relative value from the address of its own NV pack. This time interval is
Every 1 second up to 15 seconds every 1 second, 20 seconds, 60 seconds, 1
20 seconds and 240 seconds are used.

Next, an example of operations of special reproduction such as fast-forward reproduction and rewind reproduction will be described. By reproducing only the VOBU reference pictures at a certain time interval according to the speed of reproduction, it is possible to realize special reproduction at a substantially uniform speed. VOs at regular time intervals
In order to read BUs one after another, information indicating the addresses of neighboring NV packs having NV packs is used.

Further, for each time code having a fixed 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 AV data can be started from the designated time code.

[0008]

However, the technique of recording the special reproduction information as an NV pack everywhere in the AV data when recording in real time on a recordable recording medium such as a DVD-RAM. There was a problem that it could not be used. This is because, even if the above NV pack is recorded while recording AV data in real time, information regarding 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 recording of AV data is completed, the generated information is AV-packed as an AV pack.
In order to record in the data area, it is necessary to access the disk as many times as the number of VOBUs, which cannot be realized in real time. Although it is possible that AV data and trick play information are not stored in the same AV data area, it is necessary to save trick play information in the main memory in order to perform trick play at high speed, and to store trick play information. There is a problem that a large main memory capacity is required.

The present invention is directed to an optical disc, a recording device, a reproducing device, and a recording method for reducing the data amount of special reproduction information and generating special reproduction information at the same time as real-time recording of AV data.
Computer reading method, playback method, recorded program
An object is to provide a removable recording medium.

[0011]

In order to solve the above-mentioned problems, the optical disk of the present invention has a data area and a time map.
A rewritable optical disc having an area,
The data area can be played and edited according to user operations.
Video objects are recorded and
Has at least one picture with a variable compression code amount.
Each includes a plurality of unit data,
The first picture of each place data is the intra-frame code
An independently reproduced intra picture,
The time map area contains the video object playback time.
At each playback time by corresponding to each of the multiple playback times of
Recording address of unit data including picture to be played
Table is recorded, and the table is a video
There is a one-to-one correspondence with the object, and the video
Updated with the editing of the
Note that the above-mentioned
The data size of the picture is recorded and the
The disc further has a program chain area,
The program chain area includes program chain
Information is recorded, and the program chain information is
Is information in which multiple pieces of cell information are associated with the playback order.
Yes, each cell information is in the video object
Start time and end time to identify any playback section
And the identifier of the corresponding video object
It is characterized by including.

The recording apparatus of the present invention has a compression code amount of
Plural each having at least one variable picture
Video object containing unit data of
A device for recording, each of the plurality of unit data
Independent playback of the first picture of the frame is intra-coded
Is a possible intra picture, and the video object
Writing means for writing data to the optical disk, and the writing means
Control means for controlling only the means, the control means,
The video object in the data area of the optical disc
Control the writing means to write
Corresponding to multiple playback times within the playback time
Unit that contains the picture to be played at each playback time
The recording address of the data and the above-mentioned IN included in the unit data
The table that stores the data size of the tiger picture
And generate the data in the time map area of the optical disc.
Write the bull and write the program chain information to the optical disc
Write to the program chain area of
The program chain information that controls the stage
Is information in which multiple pieces of cell information are associated with the playback order.
Yes, each cell information is in the video object
Start time and end time to identify any playback section
And the identifier of the corresponding video object
And the table has a one-to-one correspondence with video objects.
Video objects that are associated with and respond to user operations
It is characterized by being updated with the editing of the project.

[0013]

[0014] Also, a computer-readable of the present invention the serial
The recording medium reads the program chain information from the optical disc.
See read-out method and program chain information
And a playback means for playing the video object.
Computer-readable recording program for playback device
It is a removable recording medium, and the program is
The step of accepting an instruction to play back quickly,
Multiple playback times at regular time intervals based on the indication
Prior to reading the table and identifying
The step of controlling the reading means and the read
Table, the playback time
The address of the unit data corresponding to each and its leading
Specifying the data size of the intra picture,
Read and play each specified intra picture.
So as to control the reading means and the reproducing means.
Characterized by having a computer execute
There is.

[0015]

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

The data area is divided into sectors (2 kbytes) which are the smallest access unit. Management information for the file system, AV data, AV data management files, non-AV data, etc. are recorded in the data area. The management information for the file system is DVD-R
It is information including the directory structure of the AM, the recording position of the file, the empty state of the data area, and the like, and is used when creating, writing, reading, and deleting the file.

The AV data is recorded as one file in a unit called a video object (hereinafter abbreviated as VOB). The VOB is a file generated by one continuous recording by the optical disk recording device, and corresponds to, for example, 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 1.2 seconds of the reproduction time of video data, and is a GOP (Group of Pictur) in the MPEG2 standard.
It includes a video data section called e). This GOP includes an I (Intra) picture (intra-frame encoded image), a P (Predictive) picture (inter-frame forward predictive encoded image), and a B (Bidirectionally Pre) in the MPEG2 standard.
dictive) picture (inter-frame bidirectional predictive coded image)
Of these, at least one I picture is included. This enables independent reproduction of GOP. In particular,
In the case of special reproduction such as fast-forward reproduction, fast-reverse reproduction, or reproduction at a designated time, the I picture in the GOP is extracted as the image to be reproduced, or the P or B picture to be reproduced and extracted as the reference image. 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, which correspond one-to-one with VOBs, are recorded. The time map information is information in which the reproduction time of the VOB and the recording position are associated with each other, and has a hierarchical data structure. That is, the time map information has hierarchical first and second time tables.

The first time table (hereinafter, also referred to as a time map table or TMAP table) is a reproduction time corresponding to a VOB and has a fixed time interval (for example, 6).
It is a table showing the recording position (sector address: LSN) of the VOBU corresponding to the reproduction time for each reproduction time in which 0 second) is sequentially set. The second time table (also referred to as VOBU table) is a reproduction time order from the beginning of the VOB.
It is a table including the reproduction time and data size of each VOBU.

FIG. 2 is a view showing a cross section and a surface of a DVD-RAM which is enlarged and cut out to a sector level. As shown in the figure, one sector consists of a pit row portion formed on the surface of a reflective film such as a metal thin film, and an uneven portion. The pit string is 0.4 stamped to show the sector address.
It consists of pits of μm to 1.87 μm.

The concavo-convex portion is composed of a concave portion (called a groove) and a convex portion (called a land). Recording marks, which are alloy thin films capable of phase change, are attached to the surfaces of the lands and the grooves. The phase change means that the state of the deposited alloy thin film changes to a crystalline state and an amorphous state by irradiation with a light beam. Data can be written in the uneven portion by utilizing the phase change. In the MO disc, only the land portion is used for recording, whereas in the DVD-RAM, data can be recorded also in the land portion and the groove portion. Realization of data recording in the groove portion increases the recording density as compared with MO. The error correction process for the sector is performed for every 16 sectors. In this embodiment, EC
A sector group (16 sectors) to which C (Error Correcting Code) is added is called an ECC block.

In the DVD-RAM, the data area is divided into a plurality of zone areas in order to realize rotation control called Z-CLV (Zone-Constant Linear Velocity) in the recording / reproducing apparatus. Figure 3 (a) shows the DVD
FIG. 6 is a diagram showing a plurality of zone areas concentrically provided in a RAM. As shown in the figure, the DVD-RAM is divided into 24 zone areas from zone 0 to zone 23. Here, the zone area refers to a group of tracks that are 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 that it becomes faster toward the inner circumferential side zone, and is kept constant while the optical pickup makes access within one zone. This allows the DVD-RA
The recording density of M is increased and the rotation control in the recording / reproducing device is facilitated.

FIG. 3B is an explanatory diagram in which the lead-in area, the zone areas 0 to 23, and the lead-out area, which are shown concentrically in FIG. 3A, are arranged in the lateral direction. The lead-in area and the lead-out area each have a defect management area (DMA). The defect management area is 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 alternative areas the sector that replaces the defective sector exists are recorded. .

Each zone area has a user area inside, and an alternative area and an unused area at the boundary. The user area is an area that the file system can use as a recording area. The replacement area is an area used as an alternative when a defective sector exists.
The unused area is an area that is not used for data recording.
The unused area is provided for about two tracks. The unused area is provided because the sector address is recorded at the same position on the adjacent tracks in the zone.
This is because, in the LV, the recording position of the sector address is different on the track adjacent to the zone boundary, and thus the sector address misjudgment resulting from this is prevented.

As described above, there are sectors that are not used for data recording at the zone boundaries. Therefore, as shown continuously in only the sectors used for data recording, the DVD-R
AM is a logical sector number (LSN: Logical
Sector Number) is assigned to the physical sector of the user area. As shown in FIG. 3C, the area for recording user data, which is composed of sectors to which the LSN is added, is called a volume space.

Further, as shown in FIG. 3D, volume structure information for treating the disk as a logical volume is recorded on the inner and outer circumferences of the volume space. A portion of the volume space excluding the inner and outer volume structure information areas is an area in which a user file is recorded and is called a partition space. In the partition space, a logical block number (LBN: Logical Block Number) is assigned from the first sector in sector units.

FIG. 4 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 device, areas are assigned to non-AV data in units of sectors, whereas AV data is assigned in units of continuous recording areas that can guarantee continuous reproduction.
The continuous recording area here is an EC that does not cross zone boundaries.
It is an area that is an integral multiple of C block and is a continuous sector of a certain size (about 7 Mbytes) or more. However, if the AV data is
When it is composed of a plurality of extents, the last extent may be smaller than the fixed size. The reason why the continuous recording area does not cross the zone boundary is that if it crosses the zone, the rotational angular velocity of the optical disk is changed, and therefore continuous reading cannot be performed. Further, the reason why the integral multiple of the ECC block is used is that it is the minimum unit of the ECC processing.

FIG. 5 shows a sector management table included in the management information for the file system recorded in the volume space, and a continuous recording area management file for managing the continuous recording area. In the figure, the volume space,
The sectors and the recorded contents of the sectors are hierarchically illustrated. The first layer shows the volume space shown in FIG.

The second layer shows a sector area in which the sector management table is recorded in the partition space. A sector management table (also referred to as a space bit map) 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,
As shown in the third layer, which is recorded not in a fixed area but in a free area as a normal file, the space bitmap shows that all sectors in the partition space are assigned or unassigned. Is represented. In this example, the bit map is 1 bit per sector. For example, logical block numbers 0 to 79
Is assigned as a space bitmap, so it is "0 (allocated)".

As shown in the third hierarchy, the continuous recording area management file indicates an area already allocated as a continuous recording area in the partition space. In the figure, the continuous recording area management file is represented as a table having a list structure including entries e1 to e4 .... Outside the frame on the left side of the table, a relative address (number of bytes) from the head of the table is added.

Each entry consists of a starting sector number (LSN), an ending 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 assigned.
The pointer points to an entry indicating the subsequent continuous recording area and is represented by a relative address from the head of the table. However, the pointer of the last entry e5 takes a value (-1) indicating the end.

In the example of the figure, the entry e1 represents a continuous area area of sector numbers 6848 to 15983,
It indicates the entry e2 (the subsequent continuous recording area) recorded from the 12th byte. The same applies to other entries. Further, the entries e1 to e4 show one continuous area (6848 to 31983) in the case where AV data is recorded four times and continuous recording areas are sequentially added.

The allocation of the continuous recording area and the space bitmap 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 allocated in the space bitmap. FIG. 6 shows a DVD-RAM
An example of AV data, non-AV data, and a directory recorded in FIG.

In the figure, an elliptical figure represents a directory and a rectangle represents a file. The root directory is RTRW and File1.DAT, File2.D
It has two non-AV data files called AT. RTRW
The directory has a plurality of AV files called Movie1.VOB, Movie2.VOB, ... And an AV data management file called RTRW.IFO. As shown in FIG. 7, each of the AV files Movie1.VOB, Movie2.VOB, ... Is recorded in the data area as one VOB. (1.2) AV data management file FIG. 8 shows the AV data management file (RTRW.I) shown in FIG.
FIG. 8 is an explanatory diagram hierarchically showing recorded contents of (FO). As shown in the figure, the AV data management file includes a title search pointer table 810 and an AV file management table 82.
0, the PGC information table 830. FIG. 9 shows a logical connection relationship between these tables and VOBs.

Title search pointer table 810
Is a table showing a list of titles recorded in the DVD-RAM. Here, the title includes a program recorded by the user in the recording device, a title created by the user's editing, and the like. 8 and 9, the title search pointer 8 included in the title search pointer table
Only 11, 812 ... Are shown.

Title search pointers 811, 812
.. is PGC (or PGC information) corresponding to the title
Is a pointer to the number of. For example, the title search pointer 811 in FIG. 9 indicates PGC information 831. Here, the PGC refers to a series of AV data in which any section of any VOB is logically linked. Further, the PGC information is information indicating a logical connection relation of an arbitrary section of an arbitrary VOB.

The AV file management table 820 is
This is information indicating the correspondence between the reproduction time and the recording position of a file, that is, VOB, and the same number of VOB information 82 as VOBs.
It is a table for recording 1, 822 ... Each of the VOB information 821, 822, ... Includes VOB general information indicating VOB-specific information such as playback time, and time map information that associates a VOB playback time with a recording position.

The VOB general information 821a is a VOB identifier for indicating to which VOB the VOB information corresponds.
It is information indicating the reproduction time of the corresponding VOB. The time map information 821b includes the above-mentioned first time table and second time table. As shown in FIG. 9, the first time table (time map table) has its reproduction time set at regular intervals (for example, 60 seconds) on the time axis with the start of the VOB as the start time. It is a table in which time maps # 1, # 2, ... Which indicate the recording position (sector address) of the VOBU corresponding to the reproduction time are arranged.

Second time table (VOBU table)
9 is a table in which a VOBU map including the VOBU playback time and the VOBU data size is arranged in order of playback time from the beginning of the VOB, as shown in FIG. PGC
The information table 830 includes a plurality of pieces of PGC information 831 and 83.
It is a table consisting of 2 ...

The PGC information 831, 832 ... Is V specified by a set of start time and end time.
It is a table in which information (referred to as a cell) indicating a video section in the OB is arranged in the order of reproduction time, and represents a series of AV data obtained by logically connecting the video sections shown in the cells in the order of arrangement. Cells 831a, 831b
... includes an AV file identifier, a VOB identifier, and a set of start time and end time indicating a video section, respectively.

In the example shown in FIG. 9, a series of AV data corresponding to one title is the title search pointer 8
11 → PGC information 831 → cells 831a to 831c → V
The OB information 821, 822, → VOB # 1, # 2 are specified in this order. In this example, the AV data for one title is composed of two VOBs # 1 and # 2, but the simplest example of PGC information such as a newly recorded title is 1 title → 1 PGC information → 1 cell. One title is composed of one VOB, such as → 1VOB information → 1VOB.

FIG. 10 is a diagram showing the data structure of an AV file, that is, VOB. As shown in the figure, VOB
Is composed of a plurality of VOBUs. The VOBU is an AV data section including compressed video data of about 0.5 seconds including at least one I (Intra) picture and other audio data, and includes a video pack (V_PCK) and an audio pack (A_PCK). Consists of an interleaved pack sequence. 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. 11 is a diagram showing a more detailed data structure of the time map information corresponding to one VOB. In the figure, time map information 821b is information that associates a VOB playback time with a recording position, and includes time map general information 8210, a time map table 8220, and
It consists of a VOBU table 8230. Figure 1 shows the logical connection between the time map table and the VOBU table.
2 shows.

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 certain time interval in which the time map is provided, the head time and head of the VOB. Includes a time offset (hereinafter abbreviated as TM_OFS) that indicates the time difference from the time in the time map of. The time map table 8220 is included in the time map general information 8210.
The TMU is provided at regular time intervals and is composed of a plurality of time maps 8211, 8212, ... As shown in FIG. 12, time maps 8211, 82
12, ... Indicate a VOBU map existing at the start time of VOB and TM_OFS, and at the reproduction time of TMU, 2TMU, 3TMU, ...

However, TM_OFS is normally "0". In this case, the time map 8211 corresponds to the start time of the VOB. Further, when the VOB head portion is edited such as deleted, TM_OFS takes a value other than "0". FIG.
Shows a logical connection relationship between the time map table and the VOBU table when the VOB head portion is deleted.
TM_OFS means the time difference between the start time of the VOB and the time of the start time map as shown in FIG. When the VOB head part is deleted, the value corresponding to the deleted VOB playback time may be set as TM_OFS.
The amount of calculation for generating the time map table can be reduced.

The reproduction time for the time map #i (hereinafter referred to as time map time) is expressed by the following equation. Time map time = (TMU * (i-1) + TM_OFS) time map 8211,
8212 ... Each consist of a VOBU map number, a time difference (abbreviated as TM_DIFF), and a VOBU address (abbreviated as VOBU_ADR).

The VOBU map number 8212a is the number of the VOBU map corresponding to the time map time.
TM_DIFF8212b represents the time difference between the start time of the VOBU and the time map time. Therefore, the start time of VOBU # j is expressed by the following equation. VOBU start time = (TMU
* (j-1) + TM_OFS-TM_DIFF) VOBU_ADR8212c is the V
This is the start address of the OBU (4 byte sector address).

The VOBU table 8230 has a one-to-one correspondence with the VOBU included in the VOB.
It is a table in which 31, 8232, ... Are arranged. V
The OBU maps 8231, 8232, ... Each consist of a reference image size, a VOBU playback time, and a VOBU size. The reference image size 8232a is the size of the first I picture in the VOBU. It is used to read a reference image during special reproduction or reproduction at a specified time.

The VOBU playback time 8232b is the VOBU
This is the time required to reproduce the BU, and is 1 byte data in this embodiment. This is used to find a target image during special reproduction or reproduction at a specified time. That is, the playback device sequentially identifies the VOBU by adding the VOBU playback time to the VOBU start time until the time of the target image is reached, and further identifies one image in the VOBU. .

The VOBU size 8232c is the data size of the VOBU, and is 2-byte data indicating the number of sectors in this embodiment. This is used to specify the address of the target image at the time of special reproduction or reproduction at a specified time. In other words, the playback device sets the V0 at the start time of the VOBU until the time of the target image is reached.
By sequentially adding the VOBU sizes of the VOBU map sequence starting from the OBU map, one VOBU containing the target image is specified, and 1 in the VOBU is further specified.
Will identify two images. (2) Recording / Reproducing Apparatus Next, an optical disk recording / reproducing apparatus according to the present invention will be described with reference to the drawings. (2-1) Overall System FIG. 14 shows an example of the configuration of a system using the optical disc recording / reproducing apparatus of this embodiment.

This system includes an optical disc recording / reproducing apparatus 10 (hereinafter referred to as a DVD recorder 10), a remote controller 6 for operating the same, a display 12 connected to the DVD recorder 10, and an antenna 11. DVD
The recorder 10 is the above-mentioned DVD-RAM as an optical disc.
The audio / video data included in the analog broadcast wave received by the
Record as a file in DVD-RAM, and also as a DVD
-Expand the compressed audio / video data recorded in the RAM and output the video signal and audio signal to the display 12. (2-2) Hardware Configuration of DVD Recorder 10 FIG. 15 is a block diagram showing the hardware configuration of the DVD recorder 10.

This DVD recorder 10 includes a control unit 1, M
PEG encoder 2, disk access unit 3, MPEG
Decoder 4, video signal processor 5, remote controller 6, bus 7
It also has a remote control signal receiver 8 and a receiver 9.
The control unit 1 includes a CPU 1a, a processor bus 1b, a bus interface 1c, and a main memory 1d, and executes a program stored in the main memory 1d to record, reproduce, or edit AV data in the DVD recorder 10. Control the whole thing. In particular, when recording the AV data, the control unit 1 generates VOB information, PGC information and the like corresponding to the recorded VOB when recording the AV data, and records or updates the AV data management file. Further, when reproducing the AV data, the control unit 1 assigns an address based on the VOB information to a section designated by the start time and the end time in the cell included in the PGC information in the AV data management file shown in FIG. Seeking and playing. In particular, in the case of special reproduction, the addresses of reference images existing at fixed time intervals (for example, 5 seconds, -5 seconds, etc.) are sequentially obtained based on VOB information, and fast forward reproduction or fast reverse reproduction is performed. ing.

The MPEG encoder 2 compresses the audio / video signal contained in the analog broadcast wave received by the receiver 9 through the antenna 11 into an MPEG stream. The disc access unit 3 has a track buffer 3a therein, and under the control of the control unit 1, records an MPEG stream input from the MPEG encoder 2 in the DVD-RAM via the track buffer 3a, and also records a DV.
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 uses the MPE read from the DVD-RAM by the disk access unit 3.
The video signal processing unit 5 that decompresses the G stream and outputs the video data and the audio signal as the decompression result 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 the 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. 14, the DVD recorder 10 has a configuration based on the assumption that it is used as a substitute for a conventional stationary VTR for home use. Not limited to this configuration, DVD
-When the RAM is also used as a recording medium of a computer, the following configuration may be adopted. That is, the disk access unit 3 is connected to the computer bus as a DVD-RAM drive device via an IF called SCSI or IDE. Further, the components other than the disk access unit 3 in the figure are realized by executing the OS and application programs on the computer hardware.

FIG. 17 is a block diagram showing the structure of the MPEG encoder 2. As shown in the figure, the MPEG encoder 2 includes a video encoder 2a, a video buffer 2b for storing the output of the video encoder, an audio encoder 2c, an audio buffer 2d for storing the output of the audio encoder, and an encoding in the video buffer 2b. Video data and audio buffer 2d
A system encoder 2e that multiplexes encoded audio data in the STC (system time clock) unit 2f that generates a synchronization clock for the encoder 2
And an encoder control unit 2 that controls and manages these
and g.

The encoder control unit 2g passes information such as GOP information and picture information to the control unit 1 in FIG. 15 every time a VOBU is generated particularly during encoding. Here, the GOP information includes the number of packs of VOBU and the number of packs of the first I picture in VOBU. The pack mentioned here is the video pack (V_PACK) and audio pack (A_PACK) shown in FIG. 10, and has a fixed length of 2 kbytes, which is the same as the sector. Therefore, in this embodiment, GO
The P information means the number of sectors occupied by VOBU and the number of sectors occupied by the first I picture in VOBU.

FIG. 18 is a block diagram showing the structure of the MPEG decoder 4. As shown in the figure, MPEG decoder 4
Is a demultiplexer 4a for separating the 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, an STC (system time clock) unit 4f for generating a synchronization clock, and a synchronization An adder 4g that adds an offset to the clock, and a selector that selects one of the synchronous clock and the synchronous clock with the offset and supplies the demultiplexer 4a, the audio decoder 4e, and the video decoder 4c. Composed of a h~4j. (2-3) Functional Block Diagram FIG. 19 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. 19, the DVD recorder 10 includes a disc recording unit 100, a disc reading unit 101, a file system unit 102, a recording / editing / playback control unit 105, a user IF unit 106, an AV data recording unit 110, an AV data editing unit 120, and The AV data reproducing unit 130 is included. The disk recording unit 100 includes a file system unit 10
When the logical sector number and one or more logical data (2048 bytes) in units of sectors are input from 2, the data is recorded. However, in reality, the disc recording unit 10
0 reads and writes logical data on the disk in units of ECC blocks (16 sectors). When the logical data is less than 16 sectors, the ECC block is once read, the ECC process is performed, and then the ECC block is recorded.

When the 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 it to the file system unit. However, in actuality, reading is performed in ECC block units, and only the necessary sector data is transferred to the file system unit through the ECC processing. This is 1 for each ECC block when reading AV data.
This is because the overhead is reduced in the same manner as the disc recording unit 100 by performing reading in units of 6 sectors.

The file system unit 102 is mainly composed of A
The AV data recording unit 110 and the AV data editing unit 12 have an AV file system unit 103 for writing and editing V files and a common file system unit 104 for performing common processing for AV files and non-AV files.
0, receiving commands relating to file writing and reading from the AV data reproducing unit 130, file management is performed with the sector of the optical disc as the minimum unit.

The recording / editing / playback control section 105 is a section for controlling the entire DVD recorder 10. In particular, the recording / editing / playback control section 105 controls a guidance display prompting a user operation, and accepts a user operation for the guidance display via the user IF section 106. Depending on the operation, recording of new AV data, reproduction and editing of recorded AV data, etc. can be performed by the AV data recording unit 110, A
A request is made to the V data editing unit 120 and the AV data reproducing unit 130.

The user IF section 106 accepts a user operation from the remote controller 6 and notifies the recording / editing / playback control section 105 of it. The control data management unit 107 reads an AV data management file that is non-AV data onto the main memory 1d, and immediately provides information in response to a request from each unit. A
The V data recording unit 110 receives a recording request from the recording / editing / playback control unit 105, and issues a command necessary for the requested recording to the AV file system unit 103. Therefore, the AV data recording unit 110 has the AV data input unit 11
1 and an AV file management information generation unit 112.

The AV data input unit 111 converts the video signal and the audio signal into MPEG data, that is, performs real-time encoding, and records the encoded MPEG data on the disc as an AV file. Output to. Also,
The AV data input unit 111 uses the M
For each VOBU of PEG data, the number of packs forming the VOBU and the number of packs of the first reference picture are calculated, and the obtained value is used as GOP information in the memory (main memory 1
In step d), the AV file is recorded and passed to the AV file management information generation unit 112.

The AV file management information generator 112 is
When the recording of the AV file by the V data input unit 111 is completed, the A data is recorded based on the GOP information stored in the memory.
VOB information, PGC information, and title search pointer corresponding to the V file are 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 stored in the file system. The data is recorded on the DVD-RAM via the unit 102.

The AV data editing unit 120 receives an edit request from the recording / editing / playback control unit 105, and issues a command necessary for editing to the AV file system unit 103. AV
The data reproduction unit 130 receives a reproduction request from the recording / editing reproduction control unit 105, and issues a command necessary for the requested reproduction to the AV file system unit 103. (2-4) Command Executed by File System Unit 102 Next, various commands supported by the file system unit 102 will be described.

The file system unit 102 receives various commands from the control data management unit 107, the AV data recording unit 110, the AV data editing unit 120, the AV data reproduction unit 130, the recording / editing reproduction control unit 105, etc., and manages files. To do. FIG. 20 shows the common file system unit 104,
6 is a list showing commands relating to file management supported by the AV file system unit 103. The 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. "DELETE" deletes the file that exists on the disk. "OPEN" acquires a file identification descriptor for a file recorded on the disc in order to access the file.

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

"MKDIR" creates a new directory on the disk. “RMDIR” deletes the directory that exists on the disk. "STATFS" queries the current status of the file system. "SET_ATTR" changes the attributes of the file that is currently open. "SEARCH_D
ISCON "is a discontinuous boundary (zone boundary) in the specified section
Checks if there is, and returns TRUE if there is, FALSE if not.

"MERGE" merges the two AV files on the disc with the data in the memory. "SPLIT" divides the AV file on the disc into two AV files. "SHORTEN" deletes the end part of the AV file on the disc and deletes unnecessary parts 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 realize processes such as recording, editing, and reproducing. (3) Recording / Reproduction Next, in the DVD recorder 10, (3-1) recording of AV file, (3-2) recording of AV data management file, (3-3) reproduction of AV data, (3-4) The reproduction from the designated time to the designated time, and (3-5) special reproduction of AV data will be described in detail. (3-1) AV File Recording Processing Recording processing includes manual recording and scheduled recording. Manual recording refers to a recording process which is started immediately after setting a few items when the user presses a "record" key on the remote controller without setting a reserved time. Scheduled recording refers to recording processing when a start time and an end time are preset.

For example, when the user presses the record button on the remote controller 6, a guidance image 200 as shown in FIG. 21 is displayed on the display 12 under the control of the record / edit reproduction controller 105. When the user presses “1” and “select” in this guidance image 200, a guidance image 201 for setting recording conditions (recording time and recording quality in this example) is displayed.

The "recording time" of the recording condition is set by the user moving the focus to "unlimited" or "designated time" with the cursor button of the remote controller 6 and pressing the "select" button again. When “designated time” is selected, the ten key button is used to switch to the guidance image for inputting the time. When the setting of the designated time is completed, the guidance image 201 is displayed again.

The "recording quality" of the recording condition has three types of high image quality, standard, and time priority regarding the bit rate and resolution of the MPEG data. Each (bit rate, resolution)
Is high quality (6 Mbps, 720 * 480 pixels) and standard (3M
bps, 360 * 480 pixels), time priority (1.5Mbps, 360 * 240)
Pixels). Now, as the recording case, “unlimited” and “time priority” are selected in the guidance image 201,
After moving to the guidance image 202, "Record" on the remote control
Suppose a button is pressed. As a result, the recording / editing / playback control unit 105 instructs the AV data recording unit 110 to perform recording, and
The V data recording unit 110 starts the recording process.

FIG. 22 is a flow chart showing a recording process in the AV data recording section 110. In the case of manual recording, the user IF unit 10 notifies the user of pressing the "Record" button.
6 to the recording / editing / playback control unit 105. Upon receipt of this notification, the recording / editing / playback control unit 105 secures a continuous recording area of a certain size (about 7 Mbytes) or more.
That is, referring to the space bit map and the continuous recording area management file, an unused continuous sector area is searched to secure a new continuous recording area (step 22).
0). At this time, there is already recorded AV data,
When the AV data to be recorded is logically continuous, a new continuous recording area is secured so as to be continuous with the existing continuous recording area as much as possible.

Further, the recording / editing / playback control section 105 controls the A
The V data input unit 111 is notified of the file identifier and the parameter indicating the time priority set in the recording condition. AV
The data input unit 111 MPEs the video data and audio data of the program of the specific channel being received via the receiver 9.
Encoding is started by the G encoder 2, and further the process of transferring the MPEG data of the encoding result to the track buffer 3a is started (step 221).

Next, the recording / editing / playback control section 105 issues a "CREATE" command including designation of the newly allocated continuous recording area to the common file system section 104 (step 222). In response to this, the common file system unit 104 returns a new file identification descriptor when a file can be created in a new continuous recording area.

At the same time, the AV data input section 111
Sends the "OPEN" command to the AV file system unit 103
Is issued to the work memory (not shown) regarding the file identification descriptor and its file entry given from the recording / editing / playback control unit 105 (step 223). F
d (abbreviated as file descriptor)).

Until the AV data input unit 111 receives a stop command from the recording / editing / playback control unit 105 (step 224), the AV data input unit 111 outputs VOB every time VOBU is encoded.
The number of packs forming U and the number of packs of the first reference image (I picture) of VOBU are stored in the main memory 1d as GOP information (steps 225 and 226). FIG. 23
Shows an example of GOP information. In the figure, VOBU # 22
Represents the GOP information stored in the main memory 1d at the time of being encoded. In this embodiment, one VOBU contains video data for about 0.5 seconds, which consists of 15 frames (or 30 fields).

Furthermore, the AV data input unit 111 sends a "WRITE" command every time a fixed amount of MPEG data is stored in the track buffer 3a.
03 (steps 228 and 229). here,
"WRITE" command is specified with three parameters A
It shall be issued to the V file system unit 103.
The three parameters are the Fd opened by the "OPEN" command, the size of the data to be recorded, and
And the buffer (track buffer 3a in this embodiment) holding Further, Fd designated as a parameter includes information indicating the recording position of the extent and the extent length, like the file entry. This information represents the continuous recording area secured in step 220. Further, when a plurality of "WRITE" commands are issued from the time Fd is opened to the time Fd is closed, it is sequentially updated. In the second and subsequent “WRITE” commands, new data is added after the already recorded data.

The AV data input unit 111 receives the "WRITE" command (steps 224 and 23) when it receives the stop command.
0) is issued, and a "CLOSE" command is issued (step 231) to notify the AV file management information generation unit 112 that the recording of the AV file (VOB) is completed (step 232). The "WRITE" command in step 230 is for recording the rest of the track buffer. The “CLOSE” command in step 255 is for writing back Fd in the work memory by the file identification descriptor and file entry on the DVD-RAM.

Although the case of manual recording has been described with reference to FIG. 23 above, in the case of reserved recording, the notification of the pressing of the "record" button is given together with the notification of the time designated as the reservation.
This is performed by the recording / editing / playback control unit 105 via the F unit 106. The recording / editing / playback control unit 105 secures a continuous recording area corresponding to the designated time. (3-2) Generation / Recording of AV File Management Information FIG.
7 is a flowchart showing a process of generating and recording V file management information.

As shown in the figure, the AV file management information generating unit 112 receives a notification from the AV data input unit 111 that the recording of the AV file is completed (step 25).
1), VOP corresponding to the GOP information stored in the memory (main memory 1d) by the AV data input unit 111 and the start address of the new continuous recording area in which the AV file is recorded.
Based on the OBU number and VOB information, that is, FIG.
The (a) VOB general information and the time map information ((b) time map general information, (c) VOBU table, (d) time map table) shown in (1) are generated as follows (step 252). (A) VOB general information (VOB identifier, VOB playback time) The AV file management information generation unit 112, if the control data management unit 107 holds an existing AV file management table, does not duplicate VOB identifiers (next number). Etc.) is assigned and not held, VOB # 1 is used as a VOB identifier, the playback time of the AV file is acquired from the AV data input unit 111, and VOB general information including them is generated. (B) Time map general information (time map number, VOBU map number, TMU, TM_OFS) The AV file management information generation unit 112 sets TMU to, for example, 60 seconds, and divides the VOB playback time by TMU to obtain the time map number. 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). (C) VOBU table (reference image size, VOBU playback time, VOBU size) Since the GOP information shown in FIG. 23 represents the reference image size of the VOBU table and the VOBU size itself,
The AV file management information generation unit 112 generates the VOBU table by adding the reproduction time of each VOBU to the GOP information. In this embodiment, the playback time of VOBU is 15
Since it is a frame (or 30 fields), 0.5 seconds (1
5 frame time). However, since the reproduction time of the last VOBU of the AV file is different, the AV file management information generation unit 112 acquires it from the AV data input unit 111 and sets it in the VOBU table. (D) Time map table (VOBU map number, time difference TM
_DIFF, VOBU address) The AV file management information generation unit 112 sequentially adds the VOBU playback time of the VOBU table, and every time the added value becomes an integer multiple of TMU, the VOBU existing at that time is obtained. By going on,
Obtain the VOBU map number, (integer multiple of TMU)-(added value)
As the time difference TM_DIFF. In addition, VOBU address is A
It 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 V data input unit 111.

After the VOB information is generated in this way,
The AV file management information generation unit 112 generates the PGC information of the title recorded by the AV data input unit 111 (step 253). AV for scheduled recording
Since one VOB is generated by the data input unit 111, the PGC information is represented by one cell whose start time and end time are the start time and end time.

The same applies to the case of manual recording, but if the user pauses during recording, the AV data input unit 111 (MPEG encoder 2)
It is desirable to use different cells because it completely interrupts the operation and because it is a break in the video scene that is meaningful to the user. In this case, the AV file management information generation unit 112 has the AV data input unit 11
A plurality of cells are generated by acquiring the time of the suspension from 1.

Further, the AV file management information generating section 11
2 generates a title search pointer that points to the generated PGC information (step 24). After this, 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 the AV data management file is created. It is acquired (step 255). However, the control data management unit 107
If the AV data management file is stored in
It may not be read.

The AV file management information generating section 112 adds steps 252-2 to the acquired AV data management file.
It is updated by adding the VOB information, PGC information, and title search pointer generated in step 54 (step 25
6), in order to record the updated AV data management file, a WRITE command in the file system unit 102,
Issue the CLOSE command (step 257), AV
The file management information generation process ends. At this time, AV
Since the data management file is a non-AV file, areas are allocated and recorded in sector units.

FIG. 25 shows an example of the time map table and VOBU table generated based on the GOP information shown in FIG. In the figure, TMU is set to 5 seconds for convenience. The VOBU reproduction time indicates the number of field times (1/60 seconds). (3-3) Reproduction of AV data In the reproduction processing, when the user presses “2” “select” in the guidance image 200 shown in FIG. 21, the guidance image 201 is displayed, and further, the user selects “1” “selection”. ", The recording / editing / playback control unit 105 notifies the AV data playback unit 130 of the title name (or title search pointer number). This starts the reproduction of title A.

FIG. 26 is a flow chart showing the contents of normal reproduction processing in the AV data reproducing unit 130. In the figure, the AV data reproducing unit 130 refers to the AV data management file held in the control data managing unit 107, and acquires PGC information and VOB information from the notified title name (or title search pointer number). (Step 281). Furthermore, the AV data reproducing unit 130
Issues an OPEN command designating the AV file indicated by the VOB information to the file system unit 102 (step 282).

Further, the AV data reproducing section 130 uses the PG
Steps 283 to 2 corresponding to the number of cells set in the C information
The title A is reproduced by repeating the loop processing of 90. That is, the AV data reproducing unit 130 refers to the time map information for each of the start time and end time of the cell, and starts the start address (sector address),
The addresses are converted into end addresses (step 284), and the addresses are designated and a READ command is issued to the file system unit 102. As a result, the disk reading unit 101 starts reading the data section of the VOB indicated by the cell.

After that, the AV data reproducing unit 130, every time a certain amount of AV data is accumulated in the track buffer 3a, until the reading of the cell is finished,
The data is decoded (steps 286-28).
8). When the cell reading by the disc reading unit 101 is completed, the AV data reproducing unit 130 decodes the data accumulated in the track buffer 3a and ends the reproduction of the cell (step 289).

In this way, after the decoding is completed for all cells in the PGC information, the AV data reproducing section 1
The 30 issues a CLOSE command to the file system unit 102 to end the reproduction processing. (3-4) Reproduction from designated time to designated time In the guidance image 205 of FIG. 21, the user arbitrarily sets the start time and the end time within the playback time range of the title in the reproduction from the designated time to the designated time. Playback when specified.

FIG. 27 is a flow chart showing a reproducing process when the start time and end time in the title are designated by the user. In the figure, the AV data reproducing unit 130
Refers to the AV data management file held in the control data management unit 107, and from the notified title name (or title search pointer number), PGC information, VOB
Information is acquired (step 295). Further, the AV data reproducing unit 130 converts the start time and the end time designated by the user into the start address and the end address with reference to the time map information (step 296), and the AV data reproducing unit 130 outputs the VOB information. An OPEN command designating the indicated AV file is issued to the file system unit 102 (step 297), and a READ command is issued to the file system unit 102 to read the start address and end address obtained by the conversion (step 2).
98). As a result, reading of the data section of the VOB designated by the disk reading unit 101 is started.

Thereafter, the AV data reproducing unit 130 decodes the AV data each time a certain amount of AV data is accumulated in the track buffer 3a until the reading of the data section is completed (step 299). -3
01). When the reading by the disc reading unit 101 is completed, the AV data reproducing unit 130 decodes the data accumulated in the track buffer 3a (step 3
02), issue a CLOSE command to the file system unit 102 (step 303), and finish the reproduction process. (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 the reproduction shown in FIGS. When is pressed, the original playback is resumed.

FIG. 28 is a flow chart showing the special reproduction processing by the AV data reproducing unit 130. During reproduction, the AV data reproducing unit 130 controls the recording / editing reproduction control unit 10.
When it is notified from 5 that the "fast forward" or "rewind" key has been pressed, the skip time Δt for special reproduction is set (step 310). For example, it is +1 second for the "fast forward" key, and -1 second for the "rewind" key. If it is notified that the "fast forward" or "rewind" key is pressed during trick play, Δt
May be further increased by +1 second or -1 second.

Further, the AV data reproducing section 130 uses the MP
The EG decoder 4 is stopped, the time ts is acquired from the MPEG decoder 4, and the track buffer 3a is cleared (steps 311-313). Next, the AV data reproducing unit 130 performs the processing from steps 315 to 325 each time the time ts is updated by the skip time Δt until there is an instruction to end the special reproduction (for example, pressing the “reproduction” key).

That is, 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 time map information to specify the VOBU map corresponding to the time ts ( Step 318),
The start address of the time map and VOBU map is calculated, and the reference image size of the specified VOBU map is read (step 319). If updated time ts
Is over 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 (steps 315-317), and then obtains the start address and the reference image size.

Further, the AV data reproducing section 130 issues a SEARCH_DISCON_AV_BLK command to the file system section 102 together with designation of the data section for the reference image size from the obtained start address (step 320). This is whether the recording area of the reference image does not cross a discontinuous boundary such as a zone boundary (whether it is a continuous area or a discontinuous area).
Is to check. If they are discontinuous (step 321), the AV data reproducing unit 130 obtains a VOBU map adjacent to the specified VOBU (step 322) and reads out its start address and reference image size (step 323).

The AV data reproducing section 130 issues a READ command to the file system section 102 together with designation of the obtained start address and reference image size (step 324). As a result, 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 process is repeated while updating the time ts by the skip time Δt until the special reproduction end instruction is given. When there is an instruction to end special playback (step 32)
5), the AV data reproducing unit 130 sets the time ts as the start time and performs the original reproduction process (step 283 of FIG. 26 or FIG. 2).
7 Return to step 296) (step 326). As described above, in the special reproduction, the addresses of the reference images existing at each skip time can be sequentially obtained according to the time map information. Moreover, in the time map information, the reproduction time and the recording position (sector address) of all VOBUs are associated with each other by the hierarchical time map information of the time map table and the VOBU table. Since it is not necessary to record the sector address), the amount of data is very small, and therefore it is easy to generate in real time during recording.

In the above-described embodiment, the DVD recorder 10 has a structure on the premise that it is used as a substitute for the conventional stationary household VTR as shown in FIG.
If the DVD-RAM is also used as a recording medium of a computer, not limited to this configuration, the following configuration may be adopted. That is, the disk access unit 3 is DV
IF called SCSI or IDE as a D-RAM drive device
Connected to the computer bus via. Further, the components other than the disk access unit 3 in the figure are realized by executing the OS and application programs on the computer hardware. In that case, the disk recording unit 100, the disk reading unit 101, and the file system unit 102 are realized mainly as a function of the OS or an application that expands the function of the OS, and the other components are realized mainly as a function of the application program. Also, the file system unit 10
Various commands supported by 2 correspond to service commands such as system calls provided to the application.

In the above embodiment, one VOB is recorded in each AV file, but a plurality of VOB data may be recorded in one AV file. In this case, in the AV data management file (RTRW.IFO), for example, the size of each VOB in each AV file or the offset address from the beginning of the file may be recorded and managed.

[0105]

The optical disc of the present invention has a data area and a data area.
A rewritable optical disc with an immap area
Yes, the data area is played according to user operation.
And the video object being edited is recorded and
The object has at least one variable compression code amount.
Including a plurality of unit data each having a picture,
The first picture of each unit data is
Intra-coded intra-playable intra-picture
There is a video object in the time map area.
Corresponding to each of multiple playback times within the playback time,
Of unit data including the picture to be played at the playback time
A table indicating recording addresses is recorded, and the table
Has a one-to-one correspondence with the video object,
Updated as the video object is edited,
In correspondence with each of the plurality of unit data,
The data size of the intra picture is recorded.
In addition, the optical disc is
Area, and the program chain area has a program
The chainchain information is recorded and the program chain
In the context information, multiple cell information are associated with the playback order.
Information, and each cell information is the video object.
And the start time for specifying the arbitrary playback section in
Information indicating the end time and the corresponding video object
It is characterized by including an identifier and .

[0106]

[0107] According to this configuration, tables, since the units to be encoded is recorded for each unit data on the basis, there is an effect that it is extremely easy to generate in real time during recording. Furthermore, since the association with the playback time of the video object address, the reproducing apparatus, there is an effect that may be less amount of memory to hold the table.

[0108]

The recording apparatus of the present invention has a compression code amount of
Plural each having at least one variable picture
Video object containing unit data of
A device for recording, each of the plurality of unit data
Independent playback of the first picture of the frame is intra-coded
Is a possible intra picture, and the video object
Writing means for writing data to the optical disk, and the writing means
Control means for controlling only the means, the control means,
The video object in the data area of the optical disc
Control the writing means to write
Corresponding to multiple playback times within the playback time
Unit that contains the picture to be played at each playback time
The recording address of the data and the above-mentioned IN included in the unit data
The table that stores the data size of the tiger picture
And generate the data in the time map area of the optical disc.
Write the bull and write the program chain information to the optical disc
Write to the program chain area of
The program chain information that controls the stage
Is information in which multiple pieces of cell information are associated with the playback order.
Yes, each cell information is in the video object
Start time and end time to identify any playback section
And the identifier of the corresponding video object
And the table has a one-to-one correspondence with video objects.
Video objects that are associated with and respond to user operations
It is configured to be updated when the project is edited.

[0110] According to this configuration, tables, since the units to be encoded is recorded for each unit data on the basis, there is an effect that it is extremely easy to generate in real time during recording. Furthermore, since the association with the playback time of the video object address, the reproducing apparatus, there is an effect that may be less amount of memory to hold the table.

[0111]

[0112]

Further, the computer-readable recording of the present invention.
The recording medium reads the program chain information from the optical disc.
See read-out method and program chain information
And a playback means for playing the video object.
Computer-readable recording program for playback device
It is a removable recording medium, and the program is
The step of accepting an instruction to play back quickly,
Multiple playback times at regular time intervals based on the indication
Prior to reading the table and identifying
The step of controlling the reading means and the read
Table, the playback time
The address of the unit data corresponding to each and its leading
Specifying the data size of the intra picture,
Read and play each specified intra picture.
So as to control the reading means and the reproducing means.
Characterized by having a computer execute
There is .

[0114] According to this configuration, tables, since the units to be encoded is recorded for each unit data on the basis, there is an effect that it is extremely easy to generate in real time during recording. Furthermore, since the association with the playback time of the video object address, the reproducing apparatus, there is an effect that may be less amount of memory to hold the table.

[Brief description of drawings]

FIG. 1 is a diagram showing an outer 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. 2 DVD-R cut out by expanding to a sector level
It is a figure which shows the cross section and surface of AM.

FIG. 3 (a) Zone area 0 to 0 in DVD-RAM
23 is a diagram showing other components. (B) It is explanatory drawing which arrange | positioned zone area 0-23 etc. in the horizontal direction. (C) Logical sector number in the volume space (LS
It is a figure which shows N). (D) Logical block number in the volume space (LB
It is a figure which shows N).

FIG. 4 is a diagram hierarchically showing a relationship between a sector and an ECC block in a zone area.

FIG. 5 is a diagram showing a space bitmap recorded in a volume space and a continuous recording area management file.

FIG. 6 is a diagram showing a hierarchical directory structure of AV files and non-AV files.

FIG. 7 is a diagram showing VOBs recorded as AV files Movie1.VOB and Movie2.VOB.

FIG. 8 is an explanatory diagram hierarchically showing the recorded contents of an AV data management file (RTRW.IFO).

FIG. 9 is a diagram showing a logical connection relationship between a title search pointer table, an AV file management table, a PGC information table, and a VOB.

FIG. 10 is a diagram showing a data structure of an AV file, that is, VOB.

FIG. 11 is a diagram showing a more detailed data structure of time map information corresponding to one VOB.

FIG. 12 is a diagram showing a logical connection relationship between a time map table and a VOBU table.

FIG. 13 is a diagram showing a time offset that is a time difference between the start time of a VOB and the time of the start time map and takes a value other than “0”.

FIG. 14 is a diagram showing a configuration example of a system using the optical disc recording / reproducing apparatus in the present embodiment.

FIG. 15 is a block diagram showing a hardware configuration of the DVD recorder 10.

FIG. 16 is a diagram showing an example of a remote controller.

FIG. 17 is a block diagram showing a configuration of an MPEG encoder 2.

FIG. 18 is a block diagram showing the structure of an MPEG decoder 4.

FIG. 19 is a functional block diagram showing the configuration of the DVD recorder 10 by function.

20 is a diagram showing commands related to file management supported by the common file system unit 104 and the AV file system unit 103. FIG.

FIG. 21 is a diagram showing a guidance image.

FIG. 22 is a flowchart showing a recording process in the AV data recording unit 110.

FIG. 23 is a diagram showing an example of GOP information.

FIG. 24 A by the AV file management information generation unit 112
9 is a flowchart showing a process of generating and recording V file management information.

FIG. 25 is a diagram showing an example of a time map table and a VOBU table generated based on GOP information.

FIG. 26 is a flowchart showing the processing contents of normal reproduction in the AV data reproducing unit 130.

FIG. 27 is a flowchart showing a reproduction process when the start time and end time in the title are designated by the user.

FIG. 28 is a flowchart showing a trick play process by the AV data playing unit 130.

[Explanation of symbols]

1 control unit 1a CPU 1b Processor bus 1c bus interface 1d main memory 2 MPEG encoder 2a video encoder 2b video buffer 2c audio encoder 2d audio buffer 2e system encoder 2f STC section 2g encoder control unit 3 Disk access section 3a track buffer 4 MPEG decoder 4a Demultiplexer 4b video buffer 4c video decoder 4d audio buffer 4e audio decoder 4f STC section 4g adder 4h-4j selector 5 Video signal processor 6 remote control 7 buses 8 Remote control signal receiver 9 receiver 10 DVD recorder 11 antenna 12 display 100 disc recording section 101 Disk reading unit 102 File System Department 103 AV file system section 104 Common File System Department 105 Recording / editing / playback control unit 106 user IF section 107 control data management unit 110 AV data recorder 111 AV data input section 112 AV File Management Information Generation Unit 120 AV data editor 130 AV data playback unit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyuki Okada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kazuhiro Tsuga 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. In-house (56) Reference JP-A-9-251763 (JP, A) JP-A-9-23404 (JP, A) JP-A-8-32934 (JP, A) JP-A-11-261962 (JP, A) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/85 91-956 G11B 20 / 12,27 / 00,27 / 10

Claims (7)

(57) [Claims] 1. A rewritable optical disc having a data area and a time map area, wherein the data area can be played and edited according to a user operation.
A video object that is recorded is recorded.
Is at least one picture with variable compression code amount
Each of the plurality of unit data, and the first picture of each of the plurality of unit data is an intra-frame coded independently playable intra picture, and the time map area includes A recording data of unit data including a picture to be reproduced at each reproduction time corresponding to each of a plurality of reproduction times.
A table showing the dress is recorded, and the table is in one-to-one correspondence with the video object.
And is updated as the video object is edited.
It is, in the table, in correspondence to the plurality of unit data each, wherein optionally the data size of the intra-picture is recorded, the optical disk further a program chain area
The program chain area has a program chain
Information is recorded, and the program chain information is information in which a plurality of pieces of cell information are associated with a reproduction order.
Each cell information is assigned in the video object.
Start time and end time to identify the desired playback section
The information shown and the identifier of the corresponding video object
An optical disc characterized by including . 2. At least one pin having a variable compression code amount.
Video containing multiple unit data, each with Kucha
A device for recording an object on an optical disc, wherein the first picture of each of the plurality of unit data is a frame.
Intra-picture intra-picture that can be played independently
, And the writing means that will be written to the video object onto the optical disc, and a control means for controlling the write means, said control means, said writing means to write the video object in the data area of the optical disc Included in the unit data recording address and unit data that contain the picture to be played at each playback time by controlling and corresponding to each playback time within the playback time of the video object.
The intra and data size of the picture to generate a table stored, viewed write-out write <br/> the table to the time map area of the optical disc, the program chain information of the optical disc programming that
Control the writing means to write to the ram chain area
The program chain information is information in which a plurality of pieces of cell information are associated with a reproduction order.
Each cell information is assigned in the video object.
Start time and end time to identify the desired playback section
The information shown and the identifier of the corresponding video object
Including , the table has a one-to-one correspondence with the video object
Of the video object according to the user operation.
A video recorder that is updated with editing . 3. A recording method in a recording device for recording, on an optical disc, a video object including a plurality of unit data, each of which has at least one picture whose compression code amount is variable , and which is a head picture of each of the plurality of unit data. Is an intra-frame-encoded independently playable intra picture, and the steps of writing the video object in the data area of the optical disc, and playing each of the playback objects in correspondence with a plurality of playback times within the playback time of the video object. The recording address of the unit data including the picture to be played at the time and the unit data
A table in which the data size of the intra picture to be stored is stored, and writing the table in a time map area of the optical disc.
Program and program chain information on the optical disc
A write step of writing in a RAM chain area , wherein the program chain information is information in which a plurality of cell information is associated with a reproduction order.
Each cell information is assigned in the video object.
Start time and end time to identify the desired playback section
The information shown and the identifier of the corresponding video object
Including, the table has a one-to-one correspondence with the video object
Of the video object according to the user operation.
A recording method that is updated with editing . 4. An apparatus for reproducing a bidet object recorded on the optical disc according to claim 1, wherein the reproducing means reads program chain information from the optical disc, and reproduces a video object by referring to the program chain information. And a control means for controlling the reading means and the reproduction means, the control means receiving an instruction to perform high-speed reproduction, and reproducing a plurality of reproductions at a certain time interval based on the instruction. By specifying the time, controlling the reading means to read the table, and referring to the read table, the address of the unit data and the data size of the intra picture corresponding to each of the plurality of reproduction times are specified. Then, read each specified intra picture and play it back. A reproducing apparatus which controls a reading unit and the reproducing unit. 5. A program from the optical disk according to claim 1.
A read-out means for reading out the chain information and a program
A reproducing method in a reproducing apparatus comprising a reproducing means for reproducing a video object with reference to chain information, the step of receiving an instruction to perform high-speed reproduction, and a certain time interval is set based on the instruction. A step of specifying a plurality of reproduction times, a step of controlling the reading means so as to read the table, and an address of unit data corresponding to each of the plurality of reproduction times and its address by referring to the read table. A reproducing method comprising: a step of specifying a data size of a leading intra picture; and a step of controlling the reading means and the reproducing means so as to read and reproduce each of the specified intra pictures. 6. A computer-readable recording medium having recorded therein a program for a recording device for recording a video object including a plurality of unit data each having at least one picture having a variable compression code amount on an optical disc, The first picture of each of the plurality of unit data is an intra-frame encoded independently playable intra picture, the program writes the video object in a data area of the optical disc, and a reproduction time of the video object. Corresponding to each
The recording address of the unit data including the picture to be reproduced at each reproduction time and the intra-frame data included in the unit data.
Generating a table in which the data size of the image is stored, and writing the table in the time map area of the optical disc.
Program and program chain information on the optical disc
Compute the writing step to write in the ram chain area
Program chain information , the program chain information is information in which a plurality of pieces of cell information are associated with a reproduction order.
Each cell information is assigned in the video object.
Start time and end time to identify the desired playback section
The information shown and the identifier of the corresponding video object
Including, the table has a one-to-one correspondence with the video object
Of the video object according to the user operation.
A recording medium characterized by being updated as it is edited . 7. The program from the optical disc according to claim 1.
A read-out means for reading out the chain information and a program
A computer-readable recording medium for recording a program for a reproducing apparatus, which comprises reproducing means for reproducing a video object by referring to chain information , wherein the program receives a command to reproduce at high speed. , A step of specifying a plurality of reproduction times with a certain time interval based on the instruction, a step of controlling the reading means to read the table, a step of referring to the read table, A step of specifying an address of unit data corresponding to each of a plurality of reproduction times and a data size of an intra picture at the head thereof, and a step of controlling the reading means and the reproducing means so as to read and reproduce each of the specified intra pictures Characterized by causing a computer to execute Recording medium.