JP2000339860A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize post-recording without temporal gap with an original video and without deteriorating picture quality by making an additional recording region and other data regions an integral multiple of the minimum unit of access in a recording medium. SOLUTION: This device is set so that the boundary between VUs(video units) themselves and the boundary between a post-recording block and an original audio block coincide with the boundary of an ECC block being the minimum unit of access. That is, the device is constituted so that the post- recording block and the original audio block are not recorded in the same ECC block. In many cases, the sizes of the VU and post-recording data do not coincide with a multiple of the size of the ECC block. Then, in order to make them coincide with the boundary of the ECC block, a padding pack is placed at the end of the VU and a post-recording block. A post-recording audio block is placed at the head of the VU.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus having an after-recording function for additionally recording data once recorded.

[0002]

2. Description of the Related Art Digital recording / reproducing apparatuses for video and audio using disk media are becoming widespread. In those systems, there is a demand for a technology for realizing an after-recording (after-recording) function at a low cost similarly to the tape media. The post-recording function is a function of adding information, particularly audio, to the already recorded audio or video later.

[0003] Japanese Patent Application Laid-Open No. 5-234084 discloses a conventional technique for realizing an after-recording function on a disk medium.
This technology takes advantage of the fact that the data reading period is shorter than the program presentation period, so that after the data is read from the currently presented disk to the memory and before the next data is read, the post-recorded audio data Is written on a disk, and it is possible to realize post-recording even if there is only one disk recording / reproducing means.

[0004] Here, the program presentation period is a unique reproduction period of each program such as video and music. For example, a video of one minute cannot be said to be correctly reproduced unless it is reproduced in one minute even if the reproducing means is changed.

FIG. 10 shows a recording format of a disk according to the prior art. The disc is composed of a sequence of ECC (Error Correction Coding) blocks.
The ECC block is a basic disk recording unit of the disk, that is, a minimum unit at the time of access, and has parity added for error correction in addition to data. When reading data, read error correction is performed in this unit, and then necessary data is extracted. On the other hand, when rewriting data, first, data is read in units of ECC blocks, necessary portions are rewritten for error-corrected data, an error code is added again, and recording is performed on the disk. This means that even when rewriting one byte, it is necessary to read and write the entire ECC block including that byte.

[0006] Video and audio are arranged in the ECC block in the order of post-recording audio block, original audio block, and original video block as shown in FIG. Each block includes the dubbed audio, the original audio, and the original video corresponding to almost the same time. In addition,
The original audio block and the original video block are collectively called an original block.
When recording an original program (video before recording post-record audio), dummy data is written in the post-record audio block.

Next, the operation during dubbing in the prior art will be described with reference to FIG. In the figure, the upper graph shows each means and the relation between each means and the recording medium. The middle part schematically shows the position of the head in the disk, and the lower part schematically shows the ratio of the program data in the buffer memory.

[0008] Here, the program is s11 in the disc.
~ S18 ~ arranged in a continuous area, s11 ~ s13, s13 ~ s1
5, s15 to s17 correspond to ECC blocks, respectively,
It is assumed that s12, s13 to s14, s15 to s16, and s17 to s18 respectively correspond to the post-record audio block.

At time t1, the area up to s13 has already been stored in the buffer memory, and the data recorded in s11 to s13 is decoded and presented (reproduced). , Encoding has been done.

At times t1 to t3, regions s13 to s15
Is read from the disk and stored in the buffer memory and the post-record buffer. The post-record buffer stores the read ECC block as it is, and
The configuration is the same as that of FIG.

The time t2 is the time at which the decoding and reproduction of the data recorded at s11 to s13 performed at the time t1 is completed. After time t2, times t1 to t3
The data of s13 to s15 read in is decoded and reproduced, and the dubbed sound of the data is input and encoded. The decoding and reproduction of the data of s13 to s15 are performed until t5.

The encoding of the after-recording sound input by t2 is completed at least by t3. At time t3, the after-recording sound input by t2 is recorded on the disk medium. At this time, when accessing s11, it takes time to wait for the rotation of the disk, but it is shorter than the time for reading and writing to the disk, so it is not considered here.

[0013] The post-recording sound is written to the disc,
It is performed from time t3 to t4. When the writing to the disk is completed at t4, data from s15 to s17 from t4 is read from the disk. Thus, the same processing is repeated thereafter.

[0014] In this prior art, the fact that the reading time is shorter than the data reproducing time by utilizing the information compression is utilized, and the recording / reproducing means is used in a time-division manner for recording and reproducing. After-recording is realized with only one recording and reproducing means.

[0015]

As described above, the EC
Even when rewriting one byte in the C block,
The entire ECC block containing that byte must be read and written. When the post-recording audio data is dispersedly arranged in the ECC blocks as in the related art, in order to record the post-recording audio data, it is necessary to rewrite most of the ECC blocks, that is, all of the data.

Also, it is necessary to take into account the seek time of the disk. There is a case where a series of programs is divided and arranged at radially distant places on a disk. When such a program is reproduced or recorded (recorded), a head seek occurs at a discontinuous point.

The operation of the prior art when a program is discontinuously recorded will be described with reference to FIG. It is assumed that the programs are arranged in two discontinuous areas of s11 to s13 and s14 to s18. At times t1 to t3, the area s1
The data of 4-s16 is read and written to the buffer memory.
At the same time, at times t1 to t2, the data in the areas s12 to s13 are decoded and presented, and after-recording voice is input. At t2, similarly, the presentation of the data in the areas s13 to 15 and the Input is performed.

When the reading of the data in the areas s14 to s16 is completed at the times t1 to t3 as described above, the head then transfers the after-recording sound of the areas s11 to s13 input by the time t2 to the areas s11 to s13. To write, the head is moved to the head of the area s13. In this movement, a seek occurs because the head passes through a discontinuous point. The seek time is from t3 to t4, and information cannot be written between t3 and t4. t4
Only after that, the recording of the after-recording sound in the areas s11 to s13 is performed.

When the writing is completed, the head is moved to the head of the area s16 to read the data of the areas s16 to s18, which are new areas. At the time of this movement, a seek occurs because it passes through a discontinuous point. This seek time is from t5 to t7. The seek ends and the area s1 at t7
Reading of 6 to s18 is started.

As described above, when the head moves past the discontinuous point, a seek occurs, and there is a problem that the whole process is delayed when reading or writing is performed. When the reading and writing processes are delayed in this way, as shown in FIG. 12, there is no more data to be presented in the buffer memory. FIG.
In, all the data in the buffer is presented at t6, and reading is not possible until t7, so that video and audio are interrupted.

In order to avoid such a situation, it is necessary to set a higher read / write speed of the disk in consideration of a round-trip seek time for recording after-recording data before and after the discontinuity.

A disk drive having a high read / write speed is more expensive than a disk drive having a low read / write speed. In addition, since it is necessary to increase the number of rotations of the disk, power consumption also increases.
On the other hand, if post-recording is to be realized with a low-speed disk drive, the image quality will be reduced and the amount of data will be reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and when recording and reproduction can be performed only in units of ECC blocks, even if the disk drive has a relatively low data transfer speed, the time difference from the original video can be reduced. An object of the present invention is to realize post-recording without any shift and without deteriorating image quality.

[0024]

According to the present invention, there is provided a data input means for inputting video and audio data, and for recording, for each predetermined unit of the input data, additional data corresponding to the data. Area insertion means for inserting an additional recording area, data recording means for recording data in which the additional recording area is inserted on a recording medium, reproduction means for reproducing the recorded data, and reproduction by the reproduction means Data recording / reproducing, further comprising: additional input means for inputting additional data to be additionally recorded to the data being reproduced; and additional recording means for writing the additional data to a corresponding additional recording area in the recorded data. In the apparatus, in the area inserting means, the additional recording area and the data area other than the additional recording area are integers of a minimum unit of access in the recording medium. With, to solve the above problems.

Further, data input means for inputting video and audio data, and for each predetermined unit of the input data,
Area insertion means for inserting an additional recording area for recording additional data corresponding to the additional recording area and a data area other than the additional recording area so as to be an integral multiple of a minimum unit of access in the recording medium; Data recording means for recording the data in which the additional recording area is inserted on a first recording medium, reproducing means for reproducing the recorded data, and data being reproduced during reproduction by the reproducing means. Additional input means for inputting additional data to be additionally recorded, additional recording means for writing data input from the additional input means to an additional recording area existing behind the recorded data, and after the end of the additional recording. An additional recording correction means for reading data written in the additional recording area and recording the data in a corresponding additional recording area. To resolve.

Further, data input means for inputting video and audio data, and for each predetermined unit of the input data, the additional recording area and a data area other than the additional recording area are the minimum unit of access in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means for detecting, in the first recording medium, a discontinuous area between predetermined units of data comprising an additional recording area and a data area corresponding to the additional recording area, and adding dummy data behind the discontinuous area. Dummy data insertion means for inserting, reproduction means for reproducing the recorded data, and addition for inputting video and audio data during reproduction by the reproduction means And force means, the additional data,
The above problem is solved by providing additional recording means for writing to a corresponding additional recording area in the recorded data.

Data input means for inputting video and audio data; and for each predetermined unit of the input data,
Area insertion means for inserting an additional recording area for recording additional data corresponding to the additional recording area and a data area other than the additional recording area so as to be an integral multiple of a minimum unit of access in the recording medium; Data recording means for recording the data in which the additional recording area is inserted on a first recording medium;
Dummy data insertion means for detecting a discontinuous area in a predetermined unit of data consisting of an additional recording area and a data area corresponding to the additional recording area, and inserting dummy data behind the discontinuous area; Reproducing means for reproducing data, additional input means for inputting video and audio data during reproduction by the reproducing means, and additional recording means for writing the additional data to a corresponding additional recording area in the recorded data A data recording / reproducing apparatus comprising: wherein the additional recording means temporarily records additional data corresponding to data including a discontinuous area in the first recording medium at a position of the dummy data; After the end of the additional recording, the additional data recorded at the position of the dummy data is
The above problem is solved by providing additional recording correction means for copying to a corresponding additional recording area. Further, instead of preparing the dummy data, the dummy data may be recorded on the second recording medium.

Further, the data input means for inputting video and audio data, and for each predetermined unit of the input data, the additional recording area and the data area other than the additional recording area are the minimum unit of access on the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means, playback means for playing back the recorded data, additional input means for inputting video and audio data during playback by the playback means, and corresponding additional data in the recorded data. What is claimed is: 1. A data recording / reproducing apparatus comprising: an additional recording unit that writes data in a recording area; Means for detecting a discontinuous area between predetermined units of data consisting of data areas corresponding to areas, and when there is a discontinuous area between predetermined units of data, the additional recording means includes: Additional data corresponding to the data located immediately before the discontinuous area is temporarily recorded on a second recording medium different from the first recording medium, and is recorded on the second recording medium after the additional recording is completed. The above object is achieved by providing additional recording correction means for copying additional data to a corresponding additional recording area on the first recording medium. Further, instead of preparing the dummy data, the dummy data may be recorded on the second recording medium.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described. FIG. 1 shows the configuration of a video disc recorder capable of post-recording in the first embodiment. As shown in the figure,
This device has an operation unit 101, a bus 110, a CPU 102, a RAM 103, a RO
M104, disk drive 109, system clock 105, buffer memory 108, encoder 106, decoder 112, multiplexer 107, demultiplexer 111, switching unit 113, and post-recording buffer 114.

The outline of each component will be described. The operation of the device
The program is managed by the CPU 102 and is stored in the ROM 104. When inserting a disc,
The management information is read from 109 and recorded in the RAM 103 via the bus 110. On the operation unit 101, what kind of program is recorded based on the management information.

First, an encoding method used in this embodiment will be described. The original video is encoded at a variable rate of about 5 Mbps by MPEG2 encoding, and the audio is encoded at a fixed rate of 256 kbps by stereo MPEG audio encoding for both the original and post-recording.

The format of the stream will be described with reference to FIG. The stream is composed of a sequence of VUs (video units). VU stands for GOP (Group
(Picture of Picture) is a collection of one video and audio and post-recording audio corresponding to the timing of the video. The GOP is a unit of compression in MPEG compression and is generally composed of about 15 frames (about 0.5 seconds). There is a post-record audio block 20 in the VU.
1, the original audio block 202 and the original video block 203 are arranged in this order. Each block is
Each is composed of a row of a post-record audio pack, an original audio pack, and an original video pack. Each pack has a fixed length of 2 Kbytes and includes a pack header and one packet.

According to the MPEG standard, when a plurality of streams (eg, video and audio) are multiplexed, an SCR 207 is included in the pack header 204 at the head of the pack so that the streams can be synchronized. PTS 209 is included in the packet header 208 at the head of the packet of each stream.
(Presentation time stamp). The SCR 207 and the PTS 209 have a 33-bit accuracy so that 24 hours can be represented with an accuracy of 1 / 90,000 seconds. The SCR 207 indicates the relative time at which the SCR in the stream is sent to the player (in the case of a disc player, read from the disc). Since the SCR needs to be inserted in the stream within 0.7 seconds, the SCR monotonically increases in a certain range in continuously played data. During playback, the demultiplexer 11
1 extracts the SCR 207 from the pack in the stream and sets it to the system clock 105 of the playback system. The system clock 105 counts up at 90 kHz. The playback unit (frame for video) of each stream has the PTS 209 as described above, and the system clock 105 is counted up and played back at the same timing as the PTS 208. In the same VU, video and audio have PTSs in almost the same range.

In the first embodiment, as shown in FIG. 3, the boundaries between VUs and the boundaries between the after-recording block and the original audio block are set to coincide with the boundaries between ECC blocks. That is, it is configured so that the post-record block and the original audio block are not recorded in the same ECC block (so as not to cross the minimum unit of access). Where the size of the ECC block is
32Kbytes. Since the size of the pack is 2Kbyte, 1EC
There are 16 packs in the C block.

In many cases, the size of the VU and post-record data does not match a multiple of 32 Kbytes, so that a gap is created when the boundaries are to be aligned. Therefore, a padding pack is placed at the end of the VU and the post-recording block in order to match the boundary of the ECC block. For example, if there is only 20 Kbytes of post-record data, a 12 Kbyte padding pack will be placed.

It should be noted that the original audio block and the post-record audio block are 16 Kb without the header.
yte (= 256 [kbit / sec] * 0.5 [sec] / 8 [bit / byte]), and each fits in one ECC block even if the header is included. Since the post-record audio block is at the head of the VU, it always fits within one ECC block.

For example, even if a post-recording audio block does not fit into one ECC block due to a transfer rate, a frame length, or the like, a padding pack is also placed at the end of the post-recording audio block, and the rear end is placed at the boundary of the ECC block. So that For example, if the post-record data is 40 Kbytes, a padding pack of 24 Kbytes may be placed. In this case, the post-record data contains EC
Two C blocks will be allocated.

First, the flow of recording an original program will be outlined with reference to FIG. Simply from the operation unit 101,
If the recording order of the original program is given,
The CPU 102 refers to the management information on the RAM 103, searches for a location of a free block in the disk, and
Inform At the same time, the CPU 102 issues a command to the encoder 106 to encode the input moving image and audio.
The multiplexer 107 multiplexes the encoded moving image, audio bit stream, and empty packets reserved for post-recording, and sends the multiplexed packets to the switching unit 113. The switching unit 113 writes the multiplexed data in the buffer memory 108. The disk drive 109 stores the buffer memory 10 at the position of the empty block given by the CPU 102.
Write the data stored in 8. At the same time, the free block information in the management information on the RAM 103 is updated. Operation unit 101
When the recording stop instruction is given from the storage device, the management information is written to the disk drive 109.

The multiplex processing will be described in detail. At the time when encoding of 1 VU of video and audio is completed in the encoder 106, 16 padding packs, that is, 1 ECC block, are continuously recorded in the buffer memory 108. The padding pack for one ECC block is a recording area for post-record audio. The recording area of this post-record audio may be changed as appropriate.

Next, each of the encoded original audio and original video packs is
Record continuously for minutes. In the process, the number of recorded packs is stored, and if the number of recorded packs is not a multiple of 16, (16-the number of recorded packs mod 1
6) Put padding packs for each piece. In other words, the pack of the original video is recorded, and the padding pack is placed after that, so that the rear end of the original video block, that is, the rear end of the VU always becomes the boundary of the ECC block.

By these processes, the start position of the post-record block, which is the head of the VU, and the rear end of the VU, which is the rear end of the original video block, are always arranged at the boundary of the ECC block.

A procedure for performing post-recording on an original program recorded according to the above procedure will be described with reference to FIG. Here, the program is located in a continuous area of s11 to s18 on the disk, and s11
S13, s13 to s15, and s15 to s17 correspond to VUs, respectively.
It is assumed that 11 to s12, s13 to s14, s15 to s16, and s17 to s18 respectively correspond to ECC blocks including the post-record audio block.

At time t1, all the areas up to s13 have already been read into the buffer memory 108, and the areas s11 to s13 have been read.
Suppose you are presenting a video and inputting post-record audio while watching it. It is also assumed that the start address of the VU of s11 to s13 and the PTS of the start packet and end packet of the original audio block are stored in the RAM 103.

At times t1 to t3, the disk drive 10
9 reads the areas s13 to s15. At that time, the address of s13
It is stored in the RAM 103. In parallel, the demultiplexer
A decoder 111 extracts data in the buffer memory 108 in the order of writing, performs demultiplexing, and extracts the extracted video packets and audio packets from a decoder 112.
Send to At this time, the PTSs of the first and last packets of the original audio block are stored in the RAM 103.

The decoder 112 performs decoding, and outputs video and audio in synchronization with the system clock 105. Further, the input audio is encoded by the encoder 106 in accordance with the video and the audio. The encoded voice is packetized and packed by the multiplexer 101 and sent to the switching unit 113.

The PTS for multiplexing includes areas s11 to s13.
PTS of the first packet of the original audio block
A value automatically generated is assigned as a start value. The packed data is transferred to the after-recording buffer 1 via the switching unit 113.
Stored in 14a.

Time t2 corresponds to the time when the original blocks in the areas s12 to s13 read up to time t1 are used up for video reproduction.

The time when the value of the PTS automatically generated by the multiplexer 107 becomes equal to or more than the PTS of the last packet of the original audio block of s11 to s13 is defined as t3. This time corresponds to the time at which the encoding of the post-recording audio input while viewing the presentation of the original video data in the areas s12 to s13 ends. At that point, the multiplexer
107 writes the padding pack into the post-record buffer 114a so that the number of packs in the post-record buffer 114a is a multiple of 16, and from time t3 to t4, the post-record buffer 114a
Is recorded in the areas s11 to s12.

Here, the reading from the disk and the post-recording audio encoding are completed at the same time at time t3, but it is needless to say that they need not be performed simultaneously.

At time t4, the input audio buffer is switched to the after-recording buffer 114b. This is because post-recording is performed on the original blocks in the areas s14 to s15. The presentation of the data in the areas s14 to s15 is performed until t6.

At time t5, the next ECC block, areas s15 to s17, is read. This timing may be any time after the end of writing at t4, and the timing at which the buffer memory does not overflow and the data in the buffer memory is not completely lost (underflow) (t4)
The reading may be started between (4 and t6). Hereinafter, the same processing is repeated.

According to the first embodiment as described above, since the time for writing post-record data is shorter than that of the related art, the period between t4 and t5 in FIG. 4 can be shortened. This means that video and audio are not interrupted even when the presentation time with respect to the disk reading time is short (when a large amount of information is allocated during a unit time or when the disk reading transfer rate is low). This has the effect.

Next, a second embodiment of the present invention will be described. The configuration, the format of the stream, and the recording format of the disk are the same as those in the first embodiment, and thus will not be described. Also, the procedure for recording the original program is the same as that of the embodiment, and therefore the description is omitted.

The processing in the second embodiment for performing post-recording on an original program will be described. The decoding and decoding are basically the same as in the first embodiment.
In parallel with the presentation, the current VU is read, and the post-record audio data corresponding to the immediately preceding VU is encoded and recorded.

The difference is that in the second embodiment, the post-record audio data corresponding to VUi is
That is, it is recorded in Ui + 1. However, only the after-recording audio data corresponding to the VUN which is the last VU at the time of after-recording is not recorded on the disk, but is held in the after-recording buffer 114. In the process, each V that was dubbed
The sequence of the start address of U is stored in the RAM 103.

As described above, by recording the post-record audio data in the VU after the corresponding original block, even if there is a discontinuity in the program recorded on the disc, the conventional technique (FIG. 12) can be used. As such, it is not necessary to seek before the discontinuity to record the post-record audio data. In addition, since the post-recording audio data corresponding to VUN, which is the last VU of the post-recording target section, is held in the post-recording buffer 114 and is not recorded on the disc, it is not necessary to destroy the post-recording audio of VUN + 1 which is not the target of post-recording. .

When the post-recording is completed, as shown in FIG.
Based on the start address of each VU stored in
The audio dubbing audio data is copied in order and returned. However, the last VU, VUN, records the after-recording audio data corresponding to the final original block, which is stored in the after-recording buffer 114, in the after-recording audio block. By this copy, the same V
The original block and the post-record audio block included in U correspond to the same time, and the synchronization between the original program and the post-record audio is realized.

Next, a third embodiment of the present invention will be described. The configuration and the format of the stream are the same as in the first embodiment.

The operation at the time of recording the original program will be described. Same as the first embodiment, except that VU
When recording on a disc in units, if the VU is located at the head of the discontinuous area, the difference is that a dummy block is recorded immediately after the discontinuous area as shown in FIG. 7B. The size of the dummy block is the same as the post-record audio block. 1
It is an ECC block and is composed of 16 padding packs.

The operation during post-recording will be described with reference to FIG. As in Fig. 12, the programs are ~ s11 ~ s13
It is assumed that they are arranged in two discontinuous areas s14 to s17. It is also assumed that dummy blocks are recorded in the sections s14 to s15. The operation from time t1 to time t3 is almost the same as the technology described above, and thus the description is omitted. The difference is that the dummy block is read between t1 and t2, and the addresses of the post-recording audio block and the dummy block immediately before the discontinuity point on the disk are stored in the discontinuity point address correspondence table in the RAM 103.

The discontinuous point address correspondence table records the pair of addresses of the post-recording audio block immediately before the discontinuous point and the dummy block immediately after the discontinuous point on the disk.
It is a table in M103. At time t2 to t3, s11 to s
The after-recording audio data corresponding to the VU in the section 13 is recorded in the dummy blocks s14 to s15. Since the dummy block is in the same continuous area as the disk reading position at times t1 to t2, it can be accessed only by waiting for the rotation of the disk. The time required for rotation waiting is much shorter than seek (seek: rotation waiting ≒ 100: 1), so compared to the conventional technology, the access time for recording post-recording audio data near the discontinuity point is much longer. Shorter. With this configuration, the number of times of passing a discontinuous point can be reduced, and the time required for seeking can be reduced.

Next, the procedure after the completion of post-recording will be described. After recording the post-record audio data,
Referring to the discontinuous point address correspondence table in the RAM 103, take out all the address pairs of the after-recording audio block and the dummy block, and copy the after-recording audio data from the dummy block to the after-recording audio block for each, and include them in the dummy block. A flag indicating a dummy is set in the header of the pack. When copying is completed for all pairs, all pairs in the discontinuous point address correspondence table are deleted.

The difference from the second embodiment is that the second embodiment has to move all the post-recording audio blocks after the post-recording, while the post-recording audio block moves only at discontinuous points. Processing time after dubbing is reduced. This effect is realized by placing a dummy block after a discontinuous point at the time of recording the original program and recording post-recording audio data near the discontinuous point in the dummy block at the time of post-recording.

FIG. 9 shows an example of a case where there is a discontinuous point in the middle of the VU. Basically, it is the same as the above embodiment. In the above-described embodiment, after reading the areas s13 to s19 while passing through the discontinuous points, in the same manner as writing the post-recording audio data corresponding to the areas s11 to s13 to the dummy blocks, the dummy blocks are written into the areas s11 to s13. Write the corresponding post-record data to the dummy block. Other processes are the same as in the above-described embodiment. After the end of the post-recording, the post-recording audio data recorded in the dummy block is recorded in the corresponding positions, ie, areas s13 to s14.

As described above, in the third embodiment, as in the second embodiment, even when there is a discontinuous point in the middle of the VU, the number of times of passing through the discontinuous point is reduced.
The time required for seeking can be reduced. In addition, recording is performed on the corresponding post-recording audio block except for the portion of the discontinuous point, and recording is performed after the end of post-recording only for the portion of the discontinuous point. Therefore, compared to the second embodiment, the processing amount after the end of post-recording is reduced. Few.

Further, when there are discontinuous points in the VU as described above, the processing becomes complicated. Therefore, it is desirable that no discontinuity point be present in the VU when the original program is recorded. As a method of doing this, when recording a VU, the length of the area from the end of the immediately preceding VU to the discontinuous point is checked, and the maximum length that the VU can take (the size of the VU to be recorded next is known. If it is shorter than (the size), it is recorded in another area, and if it is longer, it is recorded as it is, so that a discontinuous point does not come in the VU.

Further, in the case where there is a discontinuity point on the recording medium, in the third embodiment, the post-record data of the discontinuity point portion is recorded in the dummy block. Instead of being provided on a medium, another recording medium (not limited to a disk, but may be a mere memory) is provided, and the post-recording data of a discontinuous point portion is recorded on this other recording medium. Is also good.
With this configuration, it is not necessary to form a dummy block on the recording medium, and the recording efficiency on the recording medium (since the dummy block is wasted) is improved. The effect of eliminating the process of searching for can be obtained.

In the above-described embodiment, the audio is additionally recorded as a post-recording operation. However, a video signal may be additionally recorded as the additional recording.

[0069]

According to the present invention, since the additional recording area by post-recording and the area other than the additional recording area are set to an integral multiple of the minimum unit of access in the recording medium, the time for writing to the recording medium at the time of additional recording is reduced. Video and audio are not interrupted even when the presentation time for the disk reading time is short.

In the case where there is a discontinuous area in the recording medium, data to be additionally recorded at the time of additional recording is written into an after-recording area after the area from which data was read, and after the end of the after-recording, data is written to an area after. Since the written data is written back to the corresponding data, by passing through the discontinuous area at the time of post-recording, it is possible to reduce the number of times a seek occurs and to reduce the useless time of access by the seek.

Further, the last data in the post-recording data is not written in the area after the read-out area as described above, but is written in a recording medium other than the disc so that the post-recording data other than the area in which the post-recording is performed is performed. Recording area is not destroyed.

When dummy data is inserted after the discontinuous area and after-recording data is written after the discontinuous area, the post-recording data is written at the dummy data position, and the data at the dummy data position is written at the end of the post-recording operation. By performing rewriting in the corresponding area, rewriting at the end of post-recording is performed only in the discontinuous area portion, and processing at the end of post-recording can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a data format according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a recording state of a VU according to an embodiment of the present invention on a disk.

FIG. 4 is a diagram showing a processing flow, a head movement, and a buffer state according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a method for writing to a recording medium according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a processing flow, a head movement, and a buffer state according to a second embodiment of the present invention.

FIG. 7 is a diagram illustrating a recording state of a VU according to an embodiment of the present invention on a disk.

FIG. 8 is a diagram showing a processing flow, head movement, and a buffer state according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a processing flow, a head movement, and a buffer state according to a third embodiment of the present invention.

FIG. 10 is a diagram showing a state of recording on a disk in the related art.

FIG. 11 is a diagram showing a processing flow, a head movement, and a buffer state in a conventional example.

FIG. 12 is a diagram showing a processing flow, head movement, and a buffer state according to a third embodiment of the present invention.

[Explanation of symbols]

 101 operation unit 102 CPU 103 RAM 104 ROM 105 system clock 106 encoder 107 multiplexer 108 buffer memory 109 disk drive 110 bus 111 demultiplexer 112 decoder 113 switching unit 114 post-recording buffer

Claims (8)

[Claims] 1. data input means for inputting video and audio data; and area insertion means for inserting, for each predetermined unit of the input data, an additional recording area for recording additional data corresponding to the data. A data recording unit that records the data in which the additional recording area is inserted on a recording medium; a reproducing unit that reproduces the recorded data; and an additional recording on the data being reproduced during the reproduction by the reproducing unit. An additional input unit for inputting additional data to be written, and an additional recording unit for writing the additional data to a corresponding additional recording area in the recorded data. The data area other than the additional recording area and the additional recording area is an integral multiple of a minimum unit of access in the recording medium. Data recording and reproducing device. 2. A data input means for inputting video and audio data, wherein for each predetermined unit of the input data, the additional recording area and a data area other than the additional recording area are minimum access units in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means, reproducing means for reproducing the recorded data, during reproduction by the reproducing means, additional input means for inputting additional data to be additionally recorded on the data being reproduced, and input from the additional input means. Additional recording means for writing data to an additional recording area existing behind the recorded data; and writing the additional recording area to the additional recording area after the end of the additional recording. A data recording / reproducing device, comprising: additional recording correction means for reading the inserted data and recording the data in a corresponding additional recording area. 3. The method according to claim 1, wherein the additional recording unit temporarily records a part of the additional data in the data input from the additional input unit on a second recording medium other than the first recording medium. 3. The data recording / reproducing apparatus according to claim 2, wherein: 4. A data input means for inputting video and audio data, wherein for each predetermined unit of the input data, the additional recording area and a data area other than the additional recording area are minimum access units in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means for detecting, in the first recording medium, a discontinuous area between predetermined units of data including an additional recording area and a data area corresponding to the additional recording area, and dummy data behind the discontinuous area. Dummy data inserting means for inserting, reproducing means for reproducing the recorded data, additional input for inputting video and audio data during reproduction by the reproducing means A data recording / reproducing apparatus comprising: a step; and an additional recording means for writing the additional data to a corresponding additional recording area in the recorded data, wherein the additional recording means comprises: The additional data corresponding to the data located immediately before the discontinuous area is temporarily recorded at the position of the dummy data. After the additional recording is completed, the additional data recorded at the position of the dummy data is recorded in the corresponding additional recording. A data recording / reproducing apparatus comprising: an additional recording / modifying means for copying to an area. 5. A data input means for inputting video and audio data, wherein, for each predetermined unit of the input data, the additional recording area and the data area other than the additional recording area are minimum access units in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means for detecting, in the first recording medium, a discontinuous area in a predetermined unit of data including an additional recording area and a data area corresponding to the additional recording area, and dummy data behind the discontinuous area. Dummy data inserting means for inserting; reproducing means for reproducing the recorded data; and additional input for inputting video and audio data during reproduction by the reproducing means. A data recording / reproducing apparatus comprising: a step; and an additional recording means for writing the additional data to a corresponding additional recording area in the recorded data, wherein the additional recording means comprises: The additional data corresponding to the data including the discontinuous area is temporarily recorded at the position of the dummy data, and after the additional recording is completed, the additional data recorded at the position of the dummy data is copied to the corresponding additional recording area. A data recording / reproducing apparatus, comprising: 6. A data input means for inputting video and audio data, wherein, for each predetermined unit of the input data, the additional recording area and a data area other than the additional recording area are minimum access units in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means for playing back the recorded data; additional input means for inputting video and audio data during playback by the playing means; and a corresponding addition of the additional data in the recorded data. What is claimed is: 1. A data recording / reproducing apparatus comprising: an additional recording unit that writes data in a recording area, wherein the additional recording area and the additional recording area are included in the first recording medium. Means for detecting a discontinuous area between predetermined units of data comprising a data area corresponding to the data area; and, if there is a discontinuous area between predetermined units of data, the additional recording means Additional data corresponding to data located immediately before the continuous area is temporarily recorded on a second recording medium different from the first recording medium, and after the additional recording is completed, additional data recorded on the second recording medium is recorded. A data recording / reproducing apparatus, comprising: additional recording correction means for copying data to a corresponding additional recording area on a first recording medium. 7. A data input means for inputting video and audio data, wherein, for each predetermined unit of the input data, the additional recording area and a data area other than the additional recording area are minimum access units in the recording medium. Area insertion means for inserting an additional recording area for recording additional data corresponding to the data so as to be an integral multiple, and data recording for recording the data with the additional recording area inserted on a first recording medium Means for playing back the recorded data; additional input means for inputting video and audio data during playback by the playing means; and a corresponding addition of the additional data in the recorded data. What is claimed is: 1. A data recording / reproducing apparatus comprising: an additional recording unit that writes data in a recording area, wherein the additional recording area and the additional recording area are included in the first recording medium. Means for detecting a discontinuous area in a predetermined unit of data consisting of a data area corresponding to the data area; and, when there is a discontinuous area in the predetermined unit of data, the additional recording means Additional data corresponding to the data including the continuous area is temporarily recorded on a second recording medium different from the first recording medium, and after the additional recording is completed, the additional data recorded on the second recording medium is A data recording / reproducing apparatus, comprising: additional recording correction means for copying to a corresponding additional recording area on a first recording medium. 8. The method according to claim 1, wherein the area insertion means adds dummy data so that the additional recording area and an area other than the additional recording area have an integral multiple of a minimum unit of access on the recording medium. Claims 1 to 7
A data recording / reproducing device according to any one of the above.