JP3908721B2 - Recording / playback device - Google Patents

Description

  The present invention relates to an information recording medium for recording and reproducing real-time data on an information recording medium, and in particular, it is possible to record after-recording editing on an information recording medium and to reproduce the information recording medium recorded after recording. The present invention relates to a recording / reproducing apparatus.

  There is an optical disc as an information recording medium having a sector structure. In recent years, the density and the capacity have been increased, and the use of real-time data including audio data or video data, and reproduction and editing has been expanded.

  As one form of editing, there is an editing method called post-recording (after recording) editing. The post-recording editing is an editing method in which data already recorded on the information recording medium is reproduced, the reproduced data is processed, and recorded on the information recording medium again. As an example of post-recording editing, recorded audio data and video data are reproduced, BGM music is mixed with the audio data, a telop image is superimposed on the video data, and recorded on the disc again. Can be considered.

  Here, as an example of the prior art, an example relating to simultaneous recording / playback conditions of audio data and video data in post-record editing will be described.

  FIG. 2 is a one-dimensional representation of a part of the arrangement of the audio data recording area and the video data recording area on the disc. In FIG. 2, reference numerals 210, 212, 220, 222, and 240 denote audio data recording areas in which audio data A1, A2, Aj, Aj + 1, and Ae are recorded, respectively. 211, 213, 221, 223, and 241 represent video data recording areas, and video data V1, V2, Vj, Vj + 1, and Ve are recorded in the recording areas, respectively. The audio data recording area and the video data recording area are alternately arranged on the disc. For example, a video corresponding to the audio of the audio data A1 is recorded as video data V1, and similarly, A2 and V2, Aj corresponds to Vj, Aj + 1 corresponds to Vj + 1, and Ae corresponds to Ve. In addition to these data, an area for recording audio data and video data is provided on the same disk. Among these, FIG. 2 shows an audio data recording area, and 250, 252, 260, 262, and 270 represent audio data recording areas of different areas. The audio data recorded in this area is indicated by B1, B2, Bj, Bj + 1, and Be, respectively. The video data recording area 241 and the audio data recording area 250 exist on the same disc, but are separated from each other. Although not shown, there are many pairs of audio data recording areas and video data recording areas between the area before A1, between V2 and Aj, and between Vj + 1 and Ae. Similarly, a plurality of audio data recording areas exist between B2 and Bj in another area and between Bj + 1 and Be. Although not shown, other types of data may exist between the audio data recording area and the video data recording area and between the video data recording area and the audio data recording area. Other types of data will be described later with reference to FIG.

  A conventional example in which post-record editing is performed on each piece of data in FIG. 2 arranged as described above will be described. In FIG. 2, an audio post-record start point is shown in the middle of the audio data A1. In addition, a video after-recording start point is also shown in the middle of the corresponding video data V1. In post-record editing, the post-recording start point is determined while reproducing and confirming video and audio, and post-record editing is started. Therefore, the post-record editing is started with the audio data A1 including the post-record editing point shown in FIG. 2 being reproduced from the data slightly before A1. When post-recording editing is started, video or audio recording operations are simultaneously performed in addition to audio data and video data playback operations.

  FIG. 3 is a diagram showing an example of a conventional post-record editing method. Each recording area shown in FIG. 3 is the same as that described in FIG. In the example of the conventional post-record editing shown in FIG. 3, an example is described in which audio data that has been reproduced once and processed is recorded again in an already recorded audio data recording area without using another area on the disc. To do. In the present specification, after-recording editing in which data is once reproduced and processed and recorded again in the same recording area is referred to as after-recording editing in the area. To do.

  In FIG. 3, it is assumed that playback has already started from data a little before the audio data A1, and playback of the disc has reached the beginning of A1. Then, TA is the time required for reproduction from the beginning to the end of A1. After reproducing A1, next, the beginning of the video data V1 is accessed. In FIG. 3, the access time from the end of A1 to the start of V1 is represented by Tfav. However, when there is no other data between A1 and V1, it is ignored as Tfav = 0. Also good. Next, the reproduction of V1 starts. In FIG. 3, the time required for reproduction from the start end to the end of V1 is represented by TcV1.

  In the process so far, A1 and V1 read from the disk are output as actual audio and video after performing a predetermined decoding process. Furthermore, in order to perform post-record editing, it is necessary to process these audio and video and encode them again into a data format that can be recorded on the disc. Accordingly, a certain amount of processing time is required until data to be written back to the disk is prepared by post-record editing. In FIG. 3, because of this processing time, it is assumed that after-recording data to be written back to the audio data A1 has not yet been prepared at the time of reading to the end of the video data V1 on the disk, and the beginning of the next audio data A2 is accessed as it is. An example is shown. In FIG. 3, the access time from the end of V1 to the start of A2 is represented by Tfva. However, when there is no other data between V1 and A2, Tfva = 0 is set. You can ignore it.

  Hereinafter, similarly, the data is read to the end of the video data V2, and the dubbing data to be written back to A1 is prepared by this time. Therefore, in order to record the post-record data, access is made from the end of V2 to the start of A1 on the disc. In FIG. 3, this access time is represented by Tf (1). At this time, the disk device is switched from the reproducing operation to the recording operation. Generally, when the disk device switches between the reproducing operation and the recording operation, a predetermined switching processing time is often required. Therefore, the access time Tf (1) represents the longer one of the movement time from the end of V2 to the start of A1 or the switching processing time from reproduction to recording. After reaching the beginning of the audio data A1 and the process of switching from reproduction to recording is completed, the after-recording data is recorded in the audio data A1. In FIG. 3, the time required for this recording is represented by TA. After recording to the end of A1, in order to reproduce the subsequent data again, this time, access is made from the end of the audio data A1 to the start of the audio data A3. In FIG. 3, this access time is represented by Tf (1). At this time, the disk device requires a predetermined switching processing time to switch from the recording operation to the reproducing operation. Accordingly, the access time Tf (1) represents the longer one of the movement time from the end of A1 to the start of A3 or the switching processing time from recording to reproduction.

  Thereafter, the audio data A3 and the video data V3 are read out in the same manner. By this time, after-recording data to be written back to the previous A2 is prepared, the audio data A2 is accessed and recorded, and the access is performed again. The process of returning to the beginning of the next reproduction data is repeated. In the conventional example, post-record editing is performed by repeating this process.

  In this conventional post-recording editing, one cycle of the repetitive processing is a portion from the audio data recording area 220 to the video data recording area 223 in FIG. In one cycle of conventional post-record editing, audio data Aj + 1 and video data Vj + 1 are reproduced, and then the previous audio data Aj is accessed to record the post-record data, and then returns to the next reproduction data. It will be. In FIG. 3, the playback time of audio data is indicated by TA, the playback time of video data Vj + 1 is indicated by TcVj + 1, and the access time is indicated by Tf (j). In order for post-record editing to be established, it is necessary to satisfy the continuous reproduction condition in this one cycle.

  FIG. 9 is a diagram showing an example of a conventional post-record editing method for another area. The recording area shown in FIG. 9 is the same as that described in FIG. In the example of conventional post-recording editing shown in FIG. 9, post-recording editing is performed using another area on the disc. In this specification, after the recorded data recording area is reproduced, the reproduced data is processed, and after-recording editing is performed in which the recorded data is recorded in another area separated from the reproduced data on the disc. We will call it editing.

  The difference between the post-record editing to another area shown in FIG. 9 and the post-record editing to the area shown in FIG. 3 is that there is a difference in the access time to the area for recording post-record data. In post-record editing in the area of FIG. 3, the access time from the end of the video data Vj + 1 to the start of the audio data Aj is represented by Tf (j). This is the area where both the reproduction data and the recording data are the same. Because it is within, it means close-range access. On the other hand, in FIG. 9, the access time from the end of the video data Vj + 1 to the start of the audio data recording area 260 is represented by Tf. This means that long-distance access is performed because another area used for post-recording is located at a distance on the disk. In FIG. 9, the time required to record the post-record data Bj in the audio data recording area 260, which is a separate area, is indicated by TB. This is the same time as TA in the post-record editing in the area of FIG. May be considered.

  From the above, after-recording editing into an area and after-recording editing into another area only differ in access time to the area recorded by after-recording. Therefore, both of these access times are expressed in a unified manner by Tf (j). In order for post-record editing to be established, it is necessary to satisfy the continuous reproduction condition in one cycle in the after-recording repetitive processing.

Considering an after-recording cycle, regarding the j-th video data Vj, the video data size is YVj, the video data bit rate is VdVj, the video data playback time is TcVj, the audio data recording time or playback time is TA, Assuming that the access time from audio data to video data is Tfav, the time to read ECC blocks is Ts, the number of ECC blocks to be skipped in video data is a, and the number of ECC blocks to be skipped in audio data is b In order for one cycle to be established, the time when the j-th video data is consumed ≧ the processing time of one cycle,
YVj / VdVj ≧ TA + Tfav + TcV (j + 1) + 2 × Tf (j) + TA + (a + 2 × b) × Ts
Must be satisfied.

In addition to this, as a technique related to post-recording editing of an optical disc, for example, when recording original AV data, a technique for performing recording so as to leave an area for post-recording in advance is disclosed in Patent Document 1. Yes. Note that Patent Document 1 does not refer to post-recording conditions.
Japanese Patent Laid-Open No. 11-259992 (FIG. 3)

  However, as described above, in the conventional method shown in FIG. 3, in one cycle of the after-recording repetitive processing, an access always occurs every time after-recording data is recorded, and the conditions for establishing after-recording editing become severe. was there. When the conditions for establishing post-recording are determined using such a conventional method, a determination result that post-recording editing is impossible is often given to a disc on which video and audio are recorded.

  In view of the problems of the conventional method, the present invention devises a one-cycle access method in repeated processing of post-record editing, so that post-record editing can be performed even on a disc that is determined to be impossible for post-record editing by the conventional method. An object of the present invention is to provide a recording / reproducing apparatus capable of reproducing data that has been post-record edited in this manner.

In order to solve the above problems, a recording / reproducing apparatus of the present invention is an information recording medium recording / reproducing apparatus for independently recording video data and audio data, and the original audio data is recorded on the information recording medium. And an additional sequence in which data blocks including post-recording audio data are continuously recorded are formed in a different area from the main sequence in which data blocks including video data are continuously recorded. A pickup for recording or reproducing information with respect to the information recording medium, and a control unit for controlling the operation of the pickup, and at the time of reproduction of the information recording medium, the control unit is configured to start from the main sequence and the additional sequence. Read out M (M is an integer of 2 or more) data blocks corresponding to the same real time. (1) The original audio data is reproduced from the first block of the M data blocks in the main sequence, and (2) M data in the additional sequence corresponding to the M data blocks in the main sequence. (3) reproduces the video data of the first block in the main sequence, and (4) (M-1) data blocks in the main sequence. The operation of the optical pickup is controlled so as to reproduce the original audio data and video data .

  In the present invention, the value of M may be constant from the start to the end of recording or reproduction, but for example, depending on various conditions such as the amount of data in the recording buffer and the reproduction buffer during the recording or reproduction operation, The control unit may perform the recording or reproducing operation while dynamically changing the value of M.

  As described above, when recording post-record edited data on an information recording medium, a plurality of data blocks including post-record audio data are recorded on the information recording medium, and the post-edit edited information recording medium is recorded. At the time of reproduction, the number of pick-up access operations can be reduced by reproducing a plurality of continuous data blocks together for each access to the main sequence and the additional sequence. As a result, conditions for post-record editing are easily established, so post-record editing can be performed even on an information recording medium that has been determined to be impossible for post-record editing. .

  In the first recording / reproducing apparatus, the control unit controls the operation of the pickup so that audio data among audio data and video data corresponding to the same real time is reproduced before video data. Is preferred.

  In the first recording / reproducing apparatus, when the control unit reads M data blocks corresponding to the same real time from the main sequence and the additional sequence, respectively, (1) M in the main sequence Original audio data is reproduced from the first block of the data blocks, and (2) audio data is continuously recorded from the M data blocks in the additional sequence corresponding to the M data blocks in the main sequence. (3) Play the video data of the first block in the main sequence, and (4) Play the original audio data and video data from the (M−1) data blocks in the main sequence. It is preferable to control the operation of the optical pickup.

In the first recording / reproducing apparatus, the total amount of video data read from (M + 1) data blocks is YV, the bit rate of the video data is VdV, and the video data of the (M + 1) data blocks is read. Tsv is the time required for the video within the period from the start of reading video data from the first data block in the (M + 1) data blocks to the end of reading video data from the (M + 1) th data block. If the processing time required other than reading data is Tnv,
YV / VdV ≧ Tsv + Tnv
Is preferably established.

  In the second recording / reproducing apparatus, when the control unit records original audio data and video data in the first area, the video data and the video data are recorded at intervals within a fine seek range of the pickup. It is preferable to control the pickup so as to record audio data alternately.

  In the second recording / reproducing apparatus, a video reproduction buffer for accumulating video data read from the information recording medium, an audio reproduction buffer for accumulating audio data read from the information recording medium, A recording buffer for temporarily storing the audio data after recording, a video decoder for decoding the video data, an audio decoder for decoding the audio data, and an encoder for encoding the audio data; And the value of M is such that the video reproduction buffer, the audio reproduction buffer, and the recording buffer do not overflow and underflow while the M data blocks are continuously reproduced from the first area. And the range of video data transfer to the video decoder is uninterrupted. It is preferable that.

Furthermore, in the second recording / reproducing apparatus according to the preferred aspect,
Tf (j): Access time from the end of the recording area of the video data to the beginning of the recording area of the audio data to be recorded after playback of the video data Vt: Data rate TI at the time of reading data from the information recording medium Time required to reproduce data recorded in the recording area VdV: Bit rate of video data N: Number of audio channels VdA: Bit rate of audio data Tfv: From the end of the recording area of audio data to the next audio data If the access time to the beginning of the recording area,
The value of M is
It is preferable that M ≧ (Tf (j) × Vt) / (TI × (Vt−VdV−2 × N × VdA) −Tfv × Vt). Furthermore, when the audio data has a plurality of channels, it is preferable that a plurality of the audio decoders are provided corresponding to the plurality of channels.

  Hereinafter, more specific embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, an example of a post-record editing method according to an embodiment of the present invention and conditions for establishing post-record editing based thereon will be described. First, an editing model for simultaneously recording and reproducing a plurality of real-time data will be described with reference to FIG. FIG. 6 shows an editing model of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 6, 600 is a disk which is an information recording medium, and 610 records and reproduces real-time data with respect to the information recording medium. Pickup, 625 is a reproduction buffer A that stores real-time data A read from the information recording medium, 620 is a decoder A that decodes real-time data A stored in the reproduction buffer A, and 635 is a read buffer from the information recording medium. A reproduction buffer B and 630 for storing the real-time data B that has been output are a decoder B and 640 for decoding the real-time data B stored in the reproduction buffer B, and an encoder C and 645 for encoding the real-time data C. Recording buffer for recording the real-time data C recorded on the information recording medium C, 650 denotes a control unit 650 for controlling the operation of the pickup. In FIG. 6, two sets of decoders and playback buffers and one set of encoders and recording buffers are shown. However, the number of sets of buffers, encoders, and decoders may be increased or decreased according to the type and number of real-time data to be recorded and played back simultaneously. Also good.

  In simultaneous recording / playback such as post-record editing, the decoder always consumes data in the reproduction buffer, and conversely, the encoder always sends data to the recording buffer. When data is read from the disk, the data is accumulated in the reproduction buffer. If the reproduction buffer does not become empty at the time of access, real-time data reproduction is not interrupted. In addition, the data in the recording buffer decreases when data is recorded on the disk, and data is continuously accumulated at all other times. If the recording buffer does not overflow during access, recording of real-time data is interrupted. There is no. In order to perform simultaneous recording / playback of real-time data, these conditions must be satisfied simultaneously.

  FIG. 7 shows the time change of the data amount of the recording and reproduction buffer, which corresponds to the reproduction buffer and the recording buffer described in FIG. Reference numeral 710 in FIG. 7A represents a change over time in the data amount of the reproduction buffer A, and specifically represents video data to be reproduced. In FIG. 7B, reference numeral 720 represents a temporal change in the data amount of the reproduction buffer B, and specifically represents audio data to be reproduced. Reference numeral 730 in FIG. 7C represents a time change in the data amount of the recording buffer C, and more specifically, audio data to be recorded after recording. FIG. 7D schematically shows the order of recording, reproduction and access in conventional post-record editing.

  In FIG. 7D, the audio data Aj + 1 existing in the audio data recording area 222 is first reproduced. The time required for this reproduction is represented by TA. During the period of TA, audio data is accumulated in the reproduction buffer B in FIG. 7B. At other times, the data in the reproduction buffer B decreases. to continue. Next, the video data Vj + 1 existing in the video data recording area 223 is reproduced through the access Tfav. The time required for this reproduction is represented by TcV (j + 1). During the period of TcV (j + 1), video data is stored in the reproduction buffer A in FIG. 7A. A data continues to decrease. Next, the audio data recording area 220 is reached through the access Tf (j). Here, the after-recording audio data stored in FIG. 7C is recorded in the audio data recording area 220 as audio data Aj. The time required for recording is represented by TA. During the period of TA, the audio data in the recording buffer C in FIG. 7C decreases, but at other times, the data in the recording buffer C continues to increase. . Thereafter, as the next reproduction data, the audio data Aj + 2 existing in the audio data recording area 224 is accessed, and thereafter, the same processing is repeated to continue the after-recording editing.

  In order for the above-described post-record editing to be established, it is necessary to repeat the processing without causing any reproduction buffer to be empty and without overflowing any recording buffer. Therefore, paying attention to the time change of the data amount of each buffer shown in FIGS. 7A, 7B, and 7C, the data amount of the reproduction buffer decreases during the access in which no data is recorded / reproduced. At the same time, the amount of data in the recording buffer is increasing. In other words, the longer the access time, the more the recording buffer and the reproduction buffer become free. At the same time, it can be seen that shortening the access time is important for establishing post-record editing.

  Therefore, in the present invention, the conditions for establishing post-record editing are determined by the editing method shown in FIG. 1 and the conditional expression based thereon. Hereinafter, this content will be described with reference to FIG.

  FIG. 1 is a diagram showing a method of post-record editing in an area of the present invention. In FIG. 1, the recording areas 210 to 213 and 220 to 223 are the same as those described in FIG. . The following post-record editing procedure is realized by the control unit 650 controlling the operation of the pickup 610.

  In FIG. 1, after reproducing the audio data A1, the video data V1 is accessed and the video data V1 is reproduced. Thereafter, instead of recording the after-recording data, the next audio data A2 is accessed as it is. Then, the audio data A2 is reproduced and the video data V2 is accessed. The access time Tfav from the audio data to the video data and the access time Tfva from the video data to the audio data may both be ignored with the time being 0 when each data is recorded continuously. Then, after the reproduction up to the video data V2 is completed, in order to record the after-recording data, an access is made from the end of the video data V2 to the start of the audio data A1 in the time Tf (1). Then, the audio data A2 is recorded from the end of the audio data A1 in order to record the next dubbing data continuously, instead of recording the dubbing data in the audio data A1 at the time TA and then returning to the subsequent reproduction data. Is accessed in the time of Tfv (1). After the after-recording data is recorded in the audio data A2 at the time TA, the subsequent reproduction data is accessed at the time Tfv (2).

  The above-described post-record editing is set as one cycle, and the same processing is repeated thereafter. When one cycle of this iterative process is applied to each recording area from 220 to 223 in FIG. 1 and the time required for the process of one cycle is enumerated in the processing order, the reproduction time TA of the audio data Aj, the audio data Access time Tfav from the end of Aj to the start of video data Vj, playback time TcVj of video data Vj, access time Tfva from the end of video data Vj to the start of audio data Aj + 1, playback time TA of audio data Aj + 1, audio data Access time Tfav from the end of Aj + 1 to the start of video data Vj + 1, playback time TcV (j + 1) of video data Vj + 1, access time Tf (j) from the end of video data Vj + 1 to the start of audio data Aj, and audio data Aj Ahu Recording time TA, access time Tfv (j) from the end of audio data Aj to the beginning of audio data Aj + 1, post-recording recording time TA of audio data Aj + 1, access time from the end of audio data Aj + 1 to the beginning of the next reproduction data Tfv (j + 1). Note that the access time Tf (j) from the end of the video data Vj + 1 to the start of the audio data Aj includes the processing time for switching from reproduction to recording, and the next reproduction data from the end of the audio data Aj + 1. It is assumed that the access time Tfv (j + 1) to the start end includes the switching processing time from recording to reproduction.

  By summing up the above processing times, the processing time of one cycle in post-record editing is obtained, and is expressed by the following equation. In the above description, two sets of audio data and video data are reproduced together, and thereafter, the two audio data are collectively recorded in the same area as the reproduced data in one cycle. ing.

(Processing time for one cycle when post-record editing is performed in two areas together) = TA + Tfav + TcVj + Tfva + TA + Tfav + TcV (j + 1) + Tf (j) + TA + Tfv (j) + TA + Tfv (j + 1)
Here, when audio data and video data are continuously recorded adjacent to each other, Tfav and Tfva are ignored and set to 0, and a time Tfv (j) for skipping video data Vj by access processing Suppose that the time Tfv (j + 1) for skipping the video data Vj + 1 is substantially equal, and the two are represented by Tfv to obtain the following equation.
(Processing time for one cycle when post-record editing is performed in two areas together) = Tf (j) + 2 × Tfv + TcVj + TcV (j + 1) + 2 × 2 × TA
Here, as described with reference to FIG. 7, in order for post-record editing to be established, neither the audio data playback buffer nor the video data playback buffer is emptied, and the after-record audio data recording buffer does not overflow. There is a need. Go for this condition.

First, a condition is obtained for a video data playback buffer. In the case where two sets described in FIG. 1 are subjected to post-record editing in the area, the size of video data reproduced from the disc is YVj for the amount of video data Vj and YV (j + 1) for the amount of video data Vj + 1. ), The total size of both is YVj + YV (j + 1), which is stored in the video data reproduction buffer. This accumulated data is consumed by the decoder at the bit rate of the video data. Considering the variable bit rate, if the bit rate of the video data Vj is VdVj and the bit rate of the video data Vj + 1 is VdV (j + 1), the time until the video data playback buffer is consumed by the decoder and becomes empty is
YVj / VdVj + YV (j + 1) / VdV (j + 1)
It becomes.

  If this time is equal to or longer than the processing time of one cycle of post-record editing obtained earlier, the post-record editing can be performed for one cycle without emptying the video data reproduction buffer. This is the condition for one post-record editing cycle for the video data playback buffer.

Next, a condition is obtained for the audio data playback buffer. In the case where two sets described in FIG. 1 are subjected to post-record editing in the area, the size of the audio data reproduced from the disc is 2 × YA. However, it is assumed that the audio data has a constant bit rate VdA, all the audio data is recorded at the same time, and the data amount is YA. Therefore, since the audio data is consumed by the decoder at the bit rate of VdA, the time until the audio data reproduction buffer becomes empty is
2 x YA / VdA
It becomes. If this time is equal to or longer than the processing time of one cycle of post-recording editing obtained earlier, post-record editing can be performed for one cycle without emptying the audio data reproduction buffer. This is the condition for one post-record editing cycle for the audio data playback buffer.

  Next, a condition is determined for the audio data recording buffer. First, two recording methods, synchronous recording and asynchronous recording, are conceivable as recording methods for post-record data. The first synchronous recording is a recording method in which, in one cycle of post-record editing, the amount of data that is the source of post-recording read from the disc is equal to the amount of post-recording data written back to the disc. When post-record data is recorded with this synchronous recording, the amount of audio data recorded and the amount of audio data recorded are the same every cycle, so there is almost no difference in the amount of data, preventing overflow and underflow of the audio recording buffer. it can. Therefore, when recording post-record data by synchronous recording, the recording buffer for audio data only needs to have a capacity that can store post-record data for one cycle, and there is no need to worry about underflow or overflow of the recording buffer.

  The second asynchronous recording is a recording method in which the amount of post-recording data read from the disc differs from the amount of post-recording data written back to the disc in one cycle of post-record editing. For example, when data with a high bit rate is edited, or when the arrangement of data to be edited is separated on the disc, there may be a shortage of time for recording post-record data in one cycle. In such a case, asynchronous recording of the after-recording data is performed by accumulating the remaining after-recording data that could not be written in one cycle in the recording buffer and recording it later. In the case of asynchronous recording, the remaining after-recording data that could not be recorded on the disk is accumulated in the audio recording buffer every cycle. Therefore, it is necessary that the recording buffer does not overflow before all post-recording editing is completed. This condition is expressed by the following equation.

(Recording buffer size) ≧ (Total number of post-recording cycles) × (Record buffer data increase per cycle)
The total number of cycles for post-record editing means the number of cycles required from the start point to the end point of post-record editing. By multiplying this by the amount of increase in the recording buffer per cycle, the required recording buffer size is obtained. As described above, the two methods described above can be considered for recording the after-recording data, and either method may be used.

  Considering the three buffer conditions described above, that is, the video data playback buffer, the audio data playback buffer, and the audio data recording buffer, the higher the bit rate, the faster the buffer data is consumed. Therefore, the conditions for establishing post-recording become strict. Therefore, attention is paid to the condition of video data as data having the highest bit rate.

  Earlier, we calculated the time until the video data playback buffer is consumed by the decoder and emptied. However, each video data is recorded on the disc so that it has a fixed playback time when decoded and played back. To do. That is, in FIG. 1, the video data Vj and Vj + 1 may have different data amounts on the disk in consideration of the variable bit rate. Suppose that This time is defined as a data recording length TI. The unit of TI is time. Since the video data and the audio data are recorded so that the video and the audio correspond to each other, the TI of the audio data is also recorded so as to be equal to the TI of the video data. However, since audio data has a bit rate lower than that of video data, the amount of audio data is smaller than that of video data on the disc even with the same recording length TI.

When two sets of post-record editing are performed in the area, the time until the video data reproduction buffer is consumed by the decoder and becomes empty is expressed as 2 × TI, using the data recording length TI. Become. If the processing time required for one post-recording cycle is shorter than this time, post-recording editing will be established.
2.times.TI.gtoreq. (Processing time for one cycle when post-recording editing is performed in an area in two sets)
So, if you substitute,
2 × TI ≧ Tf (j) + 2 × Tfv + TcVj + TcV (j + 1) + 2 × 2 × TA
It becomes.

  Here, the TA represented as the recording time or the reproduction time of the audio data will be described in detail.

  FIG. 4 is a diagram showing details of the audio data recording area. In FIG. 4, 220 is the same as the audio data recording area 220 shown in FIG. 1 and FIG. 2, and (a) and (b) of FIG. 4 are enlarged views of the inside of this recording area. . The audio data recording area is divided into channels so that data of a plurality of audio channels can be recorded. 4A and 4B each have a recording area for N channels, 411 is a recording area for ch1, 412 is a recording area for ch2, and 417 is a recording area for ch (N-1). Reference numeral 418 denotes a chN recording area. Note that N is an integer equal to or greater than 1, and a plurality of audio channel recording areas may exist between the recording areas 412 and 417.

  With respect to FIG. 4 expressed as described above, the state of access during post-record editing will be described below. In FIG. 4 (a), it is assumed that ch1 and ch2 are audio data recorded in advance on this disc, and that the audio data of ch1 and ch2 are reproduced and become the original voice of the after-recording. Then, assuming that ch (N-1) and chN are free areas, the audio data of post-recording can be recorded in ch (N-1) and chN while leaving the audio data of ch1 and ch2. In FIG. 3, the example in which the start time of the audio data Aj is accessed using the access time Tf (j) in order to record the after-recording data after the video data Vj + 1 is reproduced has been described. In this case, this access operation accesses the head of the empty area of the channel for which after-recording is performed. Therefore, in FIG. 4A, the access landing point is not the starting end of the audio data recording area 220, but precisely the starting point of the audio data ch (N-1). Then, after the dubbing data is recorded in ch (N-1) and chN, access is again made at the access time Tf (j) toward the beginning of the subsequent reproduction data. Assuming that the time required for data recording for one channel of audio data is TcA, since data for a total of two channels of ch (N-1) and ch2 are recorded in FIG. TA = 2 × TcA, where TA is the time for recording or reproducing the desired channel. As described above, in FIG. 4A, the case where the empty areas of a plurality of channels to be recorded by post-recording are continuous within the audio data recording area 220 has been described.

  On the other hand, in the example shown in FIG. 4B, assuming that ch2 and ch (N-1) are audio data recorded in advance on this disc, the audio data of ch2 and ch (N-1) is reproduced. Suppose that it becomes the original voice of the post-recording. Then, assuming that ch1 and chN are free areas, a case where audio data for after-recording is recorded in ch1 and chN while the audio data of ch2 and ch (N-1) are left is considered. In this case, the access operation for performing post-recording recording will land at the beginning of the audio data ch1. Then, after the after-recording data is recorded in ch1, it is necessary to access the beginning of chN.

  Here, an access method of the optical disc apparatus will be described. The pickup of the optical disk device is also called an optical head, and the pickup itself can move in the radial direction of the disk. Furthermore, the lens part mounted on the pickup also moves in the radial direction of the disk by an operation independent of the pickup. it can. Fine seek, also called track jump or kick, is a method of moving to the target track position by moving only the lens portion in the radial direction of the disc while fixing the pickup position of the optical disc apparatus. Since the movable range of the lens is narrow, fine seek is used when accessing at a short distance on the disc. However, since only the lens portion is moved, it can be moved to the target track position in a short time. On the other hand, a seek operation for moving the entire pickup is used for long-distance access. This seek operation is also called long jump or long seek, and has a wide range of movement, but it takes longer to access than fine seek because of the movement of the pickup itself. When the disk medium is a spiral track and the target data is ahead of the current read position, the target data position can be reached by tracing the spiral track as it is. Such an access method based on the trace operation is referred to as rotation waiting here.

  FIG. 4B shows two access methods from the end of ch1 to the start of chN. The first is a method of accessing from the end of ch1 to the start of chN using the access time Tff by an access operation such as fine seek. The second method waits for rotation and reaches the start of chN as it is. In general, audio data has a lower bit rate than video data, and the amount of data per channel is often small. Therefore, for audio data of several channels, it may take a shorter time to reach the start of chN by simply waiting for rotation than accessing by fine seek operation. In such a case, in the example of FIG. 4B, after the dubbing data is recorded in ch1, it may reach the start end of chN waiting for rotation, and then the dubbing data may be recorded in chN. As a result, since all audio channels, that is, N channel regions are traced, the processing time in FIG. 4B is TA = N × TcA. As described above, in FIG. 4B, the case where the empty areas of a plurality of channels to be recorded by post-recording are discontinuous inside the audio data recording area 220 has been described.

  As described above, when FIGS. 4 (a) and 4 (b) are compared, the processing time differs in both cases, although audio data for two channels is recorded after recording. Although it is desirable to calculate the processing time required for post-recording in consideration of which audio channel is an empty area within the audio data recording area, the worst case as shown in FIG. TA = N × TcA may be set.

  FIG. 5 is a diagram showing details of recording areas for audio data and other types of data. In the description of FIG. 2 described above, it is described that other kinds of data may exist between the audio data recording area and the video data recording area. Examples of this other type of data include data in which the same content as adjacent audio data and video data is recorded at a lower bit rate, and management data related to adjacent audio data and video data. In FIG. 5, other type data recording areas are indicated by 530 and 540, and other type data recorded in these areas are indicated by Lj. Other symbols are the same as those in FIG.

  Since other types of data are related to adjacent audio data and video data, if the audio data and video data are changed by post-record editing or the like, it is also necessary to change other types of data related to these data. For example, when other types of data are low bit rate data, when the audio data is changed after-recording, the low-bit rate audio data needs to be changed after-recording.

  FIG. 5A shows an example in which the other type data recording area 530 is arranged adjacent to the rear of the audio data recording area 220. Here, considering the case where audio data ch (N-1) and chN are recorded after-recording, it is necessary to record and update other types of data Lj after recording audio data for two channels. Since other types of data have a low bit rate, for example, if they are considered to correspond to about one channel of audio data, as a result, in post-recording editing, two channels of audio data are combined with other types of data, that is, audio data. Data for three channels will be recorded. Therefore, the processing time TA is TA = 3 × TcA.

  In FIG. 5B, another type data recording area 540 is arranged adjacent to the front of the audio data recording area 220. Here, similarly to FIG. 5 (a), when recording audio data ch (N-1) and chN by post-recording, other types of data Lj are also recorded before audio data for two channels is recorded. It is necessary to update the record after recording. Therefore, the landing point of access for recording after-recording is the beginning of the other-type data Lj, and after recording the other-type data Lj, the audio data ch (N-1) is accessed. Access from the end of the other data Lj to the start of the audio data ch (N-1) may be reached in the access time of Tff as before, but may be reached while waiting for rotation. Data ch (N-1) and chN are recorded, and subsequent reproduction data is accessed again. As a result, in the example of FIG. 5B, since all the other type data Lj and the N-channel audio data are traced, the processing time TA is TA = (N + 1) × TcA.

  As described above, when FIGS. 5 (a) and 5 (b) are compared, both types of data are recorded in spite of the fact that audio data of the same two audio channels ch (N-1) and chN are recorded after recording. The processing time differs depending on the arrangement of Therefore, it is desirable to calculate the processing time required for post-recording, including the arrangement of other types of data during post-recording, but for simplification, in the worst case as shown in FIG. May be regarded as one of the audio channels, and TA = N × TcA. In this case, N may be the number of channels obtained by adding another type of data for one channel to the number of audio channels.

Further, there may be a defect that cannot be recorded or reproduced in the audio data recording area or other data recording area on the disc. Such a defect must be skipped in units of ECC blocks, and neither recording nor reproduction can be performed on the disc while skipping. When the time to read one ECC block is Ts, the number of ECC blocks to be skipped in video data is a, and the number of ECC blocks to be skipped in audio data including other types of data is b, the recording of audio data in the previous after-recording is performed. The processing time TA required for
TA = N × TcA + b × Ts
It becomes. Further, the time required for reproducing the video data Vj in FIG. 1 is TcVj + a × Ts.
Thus, the time required for reproduction of the video data Vj + 1 is TcV (j + 1) + a × Ts, which is expressed as an after-recording condition formula 2 × TI ≧ Tf (j) + 2 × Tfv + TcVj + TcV ( j + 1) + 2 × 2 × TA
Substituting into
2 × TI ≧ {Tf (j) + 2 × Tfv + (a + 2 × b) × 2 × Ts + TcVj + TcV (j + 1) + 2 × 2 × N × TcA}
It becomes. Furthermore, if the bit rate of recording or playback of the disc is Vt,
TcVj = TI × VdVj / Vt
TcV (j + 1) = TI × VdV (j + 1) / Vt
TcA = TI × VdA / Vt
Substituting these into conditional expressions and organizing them,
TI ≧ (Tf (j) + 2 × Tfv + (a + 2 × b) × 2 × Ts) × Vt / (2 × Vt−VdVj−VdV (j + 1) −2 × 2 × N × VdA)
This is an expression of a condition that is satisfied when two sets are combined to perform post-record editing in the area. The above expression is an expression when the video data Vj and Vj + 1 have different bit rates, that is, when the video data has a variable bit rate. On the other hand, when the video data has a fixed bit rate, if the bit rate of the video data is VdV, the above equation is replaced by VdVj = VdV (j + 1) = VdV.
TI ≧ (Tf (j) + 2 × Tfv + (a + 2 × b) × 2 × Ts) × Vt / (2 × Vt−2 × VdV−2 × 2 × N × VdA)
It becomes. This is an expression of a condition that is met when two sets of post-record editing are performed in a region when the video data has a fixed bit rate.

  In the description so far, the conditions for establishing post-record editing in the area in two sets are obtained. However, M is an integer of 2 or more, and post-record editing in the area is performed in M sets. Also good. This method will be described with reference to FIG.

  FIG. 8 is a diagram showing a method of performing post-record editing in an area for M groups. In FIG. 8, the recording areas from 210 to 215 and 220 to 221 are the same as those described in FIG. The same.

  In FIG. 8, after the audio data A1 is reproduced, the video data V1 is accessed and the video data V1 is reproduced. Thereafter, instead of recording the after-recording data, the next audio data A2 is accessed as it is. Then, the audio data A2 is reproduced, and further the video data V2 is reproduced. In this way, the set of audio data and video data is continuously played back, and after playing back to the Mth set of audio data Aj and video data Vj, the audio data A1 is accessed to record the post-record data. Then, after-recording data is recorded in the audio data A1, the next audio data A2 is accessed, and after-recording data is recorded. Thereafter, this process is repeated, and after the after-recording recording to the Mth audio data Aj is completed, Access to subsequent playback data.

As described above, in the present embodiment, M sets of audio data and video data are reproduced, M audio data are recorded after-recording, and this after-recording editing is repeated as one cycle. When the conditions for post-record editing in the area are established for M groups together, the conditional expression for performing post-record editing in the area together for the two sets obtained previously is generalized by M.
TI ≧ (Tf (j) + M × Tfv + (a + 2 × b) × M × Ts) × Vt / (M × Vt−Σ (VdVk) −2 × M × N × VdA),
(Σ is k = 1 to M)
This is an expression of a condition that is satisfied when post-record editing is performed on an area within M groups. Note that the above expression is an expression when the bit rates of the individual video data are different, that is, when the video data has a variable bit rate, and in the above expression, Σ (VdVk) is M pieces in one cycle. It means the sum of the bit rates of video data. In order to actually obtain Σ (VdVk), it is desirable to examine all the bit rates of M video data in one cycle of post-record editing. However, in order to simplify the processing, the maximum bit rate of video data to be post-record edited or the maximum bit rate of video data in one cycle may be determined and calculated. In this case, assuming that the maximum bit rate of the video data is VdVmax, Σ (VdVk) = M × VdVmax, which makes it easy to calculate the conditional expression. As a result, at the variable bit rate, the formula for the condition to be met when performing post-record editing into the area collectively for M sets is as follows:
TI ≧ (Tf (j) + M × Tfv + (a + 2 × b) × M × Ts) × Vt / (M × Vt−M × VdVmax−2 × M × N × VdA)
It becomes.

On the other hand, when the video data has a fixed bit rate, if the bit rate of the video data is VdV, Σ (VdVk) in the above equation is a total value from k = 1 to M, and therefore Σ (VdVk) = M Since it is replaced by × VdV,
TI ≧ (Tf (j) + M × Tfv + (a + 2 × b) × M × Ts) × Vt / (M × Vt−M × VdV−2 × M × N × VdA)
It becomes. This is an expression of a condition that is satisfied when post-record editing is performed on the M sets together in the area when the video data has a fixed bit rate. This equation is the same as the variable bit rate equation in which VdVmax is expressed by VdV, and corresponds to an equation that uniformly expresses the variable bit rate and the fixed bit rate.

In order to obtain M for establishing post-record editing, an equation obtained by modifying the above-described unified conditional expression with respect to M may be used. That is, in the above formula, if the element that skips the ECC block is omitted and a = b = 0,
M ≧ (Tf (j) × Vt) / (TI × (Vt−VdV−2 × N × VdA) −Tfv × Vt)
This is an expression for obtaining M for establishing post-record editing when post-record editing is performed in the region by combining M sets. If M satisfying this conditional expression is obtained within an integer range of 2 or more, post-record editing can be established.

  FIG. 12 is a flowchart showing the contents of post-record editing processing. The flowchart in FIG. 12 corresponds to the method of performing post-record editing in the region in a group of M groups shown in FIG. 8, and will be described below with reference to FIGS.

  In FIG. 12, the post-record editing process starts from a start process C10. As a premise, it is assumed that reproduction of audio data and video data has already started before C10 is started. Next, by executing the process C20 for accessing the audio data in FIG. 12, the reproduction process started in FIG. 8 reaches the beginning of the audio data A1. Next, the audio data A1 is reproduced in FIG. 8 by executing the process C22 for reproducing the audio data in FIG. Next, by executing the process C24 for accessing the video data in FIG. 12, in FIG. 8, the access from the end of the audio data A1 to the start of the video data V1 is executed. Next, by executing the process C26 for reproducing the video data in FIG. 12, the video data V1 is reproduced in FIG.

  At this point, one set of audio data and video data has been played back, and the playback count determination process C30 is executed in FIG. In C30, the number of groups that have been reproduced is compared with the number of Ms that have been recorded after M groups. Here, M is an integer of 2 or more, and when the number of sets that have been reproduced in C30 is less than M, the process returns to C20 again. Then, by executing the process of accessing the audio data of C20, the access from the end of the video data V1 to the start of the audio data A2 is executed in FIG. 8, and the processes of C22, C24, and C26 of FIG. As a result, audio data A2 and video data V2 are reproduced in FIG. Thereafter, the same process is repeated until the condition of the reproduction count determination process C30 in FIG. 12 is satisfied.

  Then, in FIG. 8, assuming that a total of M sets of audio data and video data are reproduced at the stage of reproducing audio data Aj and video data Vj, the comparison condition is satisfied in the determination process of C30 in FIG. Therefore, as the next processing C40, access to the data to be dubbed and switching processing from reproduction to recording are executed. By this process, in FIG. 8, the access from the end of the video data Vj to the start of the audio data A1 is executed, and the switching process from reproduction to recording is executed in the apparatus. Next, by executing the process C50 for recording the data to be dubbed in FIG. 12, the dubbing data is recorded in the audio data A1 in FIG. At this point, the after-recording data has been recorded once.

  Next, the after-recording number determination process C60 of FIG. 12 is executed. In the after-recording number determination process C60, the number of times after-recording data is recorded is compared with the number of Ms that are recorded M times after-recording. This M is an integer equal to or greater than 2, and is the same value as M compared in the determination processing C30 for the number of reproductions. In the C60 after-recording number determination process, if the number of times after-recording data is recorded is less than M, processing C62 for accessing the next after-recording area is executed. By executing C62, the access from the end of the audio data A1 to the start of the next audio data A2 is executed in FIG. Next, in FIG. 12, the process returns from the process of C62 to the process of C50 again, and the process C50 for recording the data to be dubbed is executed. In this process, the post-record data is recorded in the audio data A2 in FIG. At this point, the after-recording data has been recorded twice.

  In FIG. 12, the after-recording determination process C60 is executed again, and thereafter the same process is repeated until the determination condition of C60 is satisfied. Then, if the number of times after-recording data is recorded becomes M at the stage where the after-recording data is recorded up to the audio data Aj in FIG. 8, the comparison condition is satisfied in the determination process of C60 in FIG. Proceed to C70. In post-recording end determination processing C70, it is determined whether or not the entire post-recording editing has been completed. If the post-record editing is still continued, the process branches to the next C80. In the process of C80, the subsequent reproduction data is accessed and the process of switching from recording to reproduction is executed. By this processing, in FIG. 8, the access is performed from the end of the audio data Aj to the start of the subsequent reproduction data. The continuous reproduction data means audio data or video data that follows the video data Vj, although not shown in FIG. In addition to performing this access, a switching process from recording to reproduction is executed in the apparatus.

  The processing so far corresponds to one cycle in the post-record editing method. In this one-cycle process, M sets of audio data and video data are reproduced, and then the after-recording data is recorded together M times. In FIG. 12, after executing the process of C80, the process returns to the process C22 for reproducing the audio data again, and thereafter, this one-cycle process is repeated. When all the post-recording editing is completed, the determination is made by the post-recording end determination process C70, and the process proceeds to the end process C90, where the entire post-recording editing is completed.

  In the vicinity of the end of post-record editing, the number of audio data and video data may be less than the number of repetitions M. Therefore, in the determination process at C30 and C60, not only the number of times with M is compared. Further, it may be determined in consideration of whether it is near the end of the after-recording.

  FIG. 15 is a graph showing a conditional expression for post-record editing. In FIG. 15, the horizontal axis represents the bit rate of video data, and the vertical axis represents the recording length of video data. The recording length of video data represents how many seconds of video data is recorded in one video data recording area, and the recording length is expressed in units of time. The graph of F10 represents the case where the number of after-recording edits M is M = 1, the graph of F20 represents the case of M = 2, and the graph of F30 represents the case of M = 3. ing.

The graph of FIG. 15 is an expression of a condition that is satisfied when post-recording editing is performed in an area for M groups.
TI ≧ (Tf (j) + M × Tfv + (a + 2 × b) × M × Ts) × Vt / (M × Vt−Σ (VdVk) −2 × M × N × VdA),
(Σ is k = 1 to M)
Can be created by substituting actual numerical values. For example,
M = 2 times N = 4 channels Tf (j) = 800 msec
Tfv = 100msec
a = 2 pieces b = 1 piece Ts = 20 msec
Vt = 30Mbps
VdA = 1Mbps
If a specific numerical value is substituted, the video data recording length TI becomes a graph with the video data bit rate VdVk as a variable.

  Furthermore, by changing the value of M and creating some graphs, the value of M for establishing post-record editing can be obtained. For example, FIG. 15 shows a graph of M = 1 in F10, a graph of M = 2 in F20, and a graph of M = 3 in F30. Here, it is assumed that there is a disc to be post-record edited, and video data and audio data are alternately recorded at a certain recording length TIa on the disc. Further, it is assumed that the bit rate of the video data on the disc is F40. In this case, in the graph of FIG. 15, when the point where the bit rate on the horizontal axis is F40 is obtained for the three graphs F10, F20, and F30, the required recording lengths for the vertical axes of the respective graphs are F11, F21, It turns out that it is F31. The meaning of the intersection of this graph is as follows.

  First, it can be seen from the graph F10 with M = 1 that in order to perform post-record editing of the data with the bit rate F40 in the cycle with M = 1, it is necessary to record the recording length at least as long as F11. Next, from the graph F20 with M = 2, it can be seen that in order to post-record edit the data of the bit rate F40 in the cycle of M = 2, it is necessary to record the recording length at least as long as F21. . From the graph F30 with M = 3, it can be seen that in order to perform post-record editing of the data of the bit rate F40 in the cycle of M = 3, it is necessary that the recording length is recorded at least at a time longer than F31. Here, if the recording length TIa of the disc to be post-recorded is F11> TIa> F21, post-record editing is not established with the number of repetitions of M = 1, and if post-recording editing is performed with the number of repetitions of M = 2 or more, You can see that the editing is successful. Incidentally, the post-record editing with M = 1 is equivalent to the conventional method because the post-record data is recorded once every time one set of audio data and video data is reproduced. As described above, the post-recording editing according to the present embodiment is performed on the disc in which the post-recording editing is not established by the conventional method, and the conditional expression for performing the post-recording editing with the number of repetitions of M = 2 or more is calculated. It is characterized in that the number of repetitions for editing is obtained and post-record editing is possible.

  Note that the number of repetitions M may be limited depending on the size of the recording buffer and playback buffer of the apparatus. In such a case, when data is recorded on the disc, video data and audio data may be recorded with a recording length that allows post-record editing to be established with a certain number of repetitions M.

  Also, a numerical value of access time is required to calculate the conditions for post-record editing. In order to obtain the access time, for example, the following method shown in FIG. 14 may be used.

  FIG. 14 is a diagram showing an access model of the disk device. FIG. 14A is an access graph in which the horizontal axis represents the access movement distance and the vertical axis represents the access time. E10 is a graph representing the access time of the disk device in a simplified manner. The graph E10 can be created by a method of measuring the access performance of the disk device in advance. In order to obtain the access time using the access graph of FIG. 14A, first, the movement distance when accessing the movement destination data from the movement source data on the disk is obtained. The movement distance can be calculated from the address information of the movement source data and the movement destination data. When the movement distance is obtained, the corresponding movement distance is searched for on the horizontal axis of the access graph of FIG. 14A, and this is the access time for which the value on the vertical axis of the point intersecting the graph E10 is obtained. For example, when the distance of a certain access is the value of E33 on the horizontal axis of FIG. 14A, the access time is the value of E23. Thus, a desired access time can be obtained by using an access graph as shown in FIG. Note that the graph E10 in FIG. 14A is a simplified graph for the sake of explanation, but the conditions for post-record editing are calculated with high accuracy by reflecting more detailed access performance in the graph. be able to.

  FIG. 14B shows an access table, and the horizontal columns indicate the current position on the disk with Sr1, Sr2, Sr3, and Sr4. In the vertical column, the target positions on the disc are indicated by Dr1, Dr2, Dr3, and Dr4. In the access table of FIG. 14B, for the sake of explanation, the area on the disk is divided into four areas according to the radius. For example, the area of less than 30 mm radius on the disk is Dr1 and Sr1, the area of radius 30 mm to 60 mm is Dr2 and Sr2, the area of radius 60 mm to 90 mm is Dr3 and Sr3, and the area of radius more than 90 mm is Dr4 and Sr4. Can be divided as follows. In the access table of FIG. 14B expressed as described above, the access time is obtained as follows. For example, if the access source data is an area having a radius of less than 30 mm on the disk, the current position is Sr1. Next, when the access destination data is an area having a radius of 60 mm to 90 mm, the target position is set to Dr3. When the intersection of Sr1 and Dr3 is obtained from the access table, a value of 500 msec is obtained. As described above, the access time can be obtained even by using an access table as shown in FIG. In the access table of FIG. 14B, the area on the disk is divided into four, but by dividing it more finely, an accurate access time can be obtained.

  FIG. 13 is a diagram showing the configuration of an embodiment (editing apparatus) of the recording / reproducing apparatus of the present invention. In FIG. 13, D10 is control means, D11 is CPU, D12 is memory means, D20 is bus means, and D30. Is disk drive means, D40 is decoder A means, D50 is decoder B means, D60 is encoder C means, D13, D31, D41, D51 and D61 are interface means for connecting each means and bus means, D70 is AV signal processing means, D42, D52 and D62 are interface means for connecting each means and AV signal processing means, D80 is an AV output means, D90 is an AV input means, and D81 and D91 are interface means for connecting each means and the AV signal processing means.

  The operation of the recording / reproducing apparatus of the present embodiment configured as described above will be described below. The video data read by the disk drive means D30 is transmitted to the decoder A means D40 via the bus means D20 and is decoded. The audio data read by the disk drive means D30 is transmitted to the decoder B means D50 via the bus means D20 and is decoded. The decoded data is transmitted to the AV signal processing means D70, and is output to the AV output means D80 after synchronizing video and audio and performing necessary signal processing. While reproducing the video and audio in this way, the video and audio to be dubbed this time are input from the AV input means D90. In the AV signal processing means D70, the video and audio input from the AV input means D90 and the audio data and video data reproduced from the disc are processed together and transmitted to the encoder C means D60. The post-record data encoded by the encoder C means D60 is transmitted to the disk drive means D30 via the bus means D20 and recorded on the disk. The control means D10 controls the series of post-record editing, and when starting post-record editing, calculates a condition for establishing post-record editing, and controls post-record editing based on the calculation result. . Although FIG. 13 shows two decoder means and one encoder means, the number of these means may be increased as necessary.

  As described above, in the first embodiment, the post-record editing method for the area has been described. In post-record editing within an area, increasing M increases the post-record editing. However, if M is excessively increased in FIG. 8, the access time Tf (j) from the end of the video data Vj to the start of the audio data A1 increases. This means that the access distance for returning to the area where the after-recording data is recorded increases, and if M is increased too much, the access distance may exceed the fine seek range. If the access distance exceeds the fine seek range, the access time Tf (j) increases abruptly, making post-record editing difficult. In this way, in post-record editing within an area, when M is increased within the range in which post-record editing is established, if an upper limit of M is set so that access can be made within the range of fine seek, post-record editing is more easily established. .

Further, as M is increased, the amount of post-recording data to be recorded collectively in one post-recording cycle increases, so it is necessary to consider the size of the recording buffer. The amount of post-recording data recorded in one cycle of post-recording is M × TI × Na × VdA, assuming that Na channel audio data is recorded post-recording. If the size of the recording buffer is Bc, the condition that the recording buffer does not overflow during one dubbing cycle is:
Bc ≧ M × TI × Na × VdA
When this is transformed with respect to M, the following equation is obtained.

M ≦ Bc / (TI × Na × VdA)
This is the upper limit of M so that the recording buffer does not overflow during one dubbing cycle.

  As described above, when obtaining M for establishing post-record editing, not only the lower limit of M is obtained by the formula for post-recording conditions, but the upper limit of M within the range of the fine seek and the recording buffer do not overflow. M may be obtained in consideration of the upper limit of M.

  As described above, in the first embodiment of the present invention, a process of reproducing M sets of audio data and video data, and then recording the M audio data in the area after-recording is one cycle. Find the conditions for the post-record editing of. Then, by increasing M in a range that satisfies this conditional expression, an effect that post-record editing is easily established can be obtained.

(Embodiment 2)
Embodiment 2 of the present invention will be described below. FIG. 10 is a diagram showing a method of post-recording editing to another area (additional sequence to be described later) in the recording / reproducing apparatus according to the present embodiment. In FIG. 10, each of 210 to 213 and 220 to 223 is shown. The recording area is the same as that described in FIG. The reproduction up to the audio data A1, the video data V1, the audio data A2, and the video data V2 is the same as that described with reference to FIG. In FIG. 10, original audio data Ai, video data Vi, and post-recording audio data Bi are data corresponding to the same real time. Furthermore, the schematic configuration of the recording / reproducing apparatus according to the present embodiment is the same as that shown in FIG. The following post-record editing procedure is realized by the control unit 650 controlling the operation of the pickup 610.

  10, the recording areas of the areas 210 to 223... And the recording areas of the areas 250 to 262... Are arranged at positions separated from each other on the recording medium. Hereinafter, the recording areas of the areas 210 to 223... Are referred to as a main sequence, and the recording areas of the areas 250 to 262. Further, in the main sequence, combinations of audio data and video data in areas adjacently arranged as areas 210 and 211 and areas 212 and 213 correspond to the same real time. Thus, in the main sequence, a group of data (recording area) including a combination of audio data and video data corresponding to the same real time is defined as one data block. That is, for example, the area 210 and the area 211 are handled as one data block. On the other hand, in the additional sequence, for example, the area 250 corresponds to the same real time as the data blocks of the area 210 and the area 211 of the main sequence, and the recording area of the area 252 is the same as the data blocks of the area 212 and the area 213 of the main sequence. Corresponds to real time. In the additional sequence, each of the area 250, the area 252,... Is handled as one data block.

  In post-record editing to another area (additional sequence), after the main sequence has been reproduced up to video data V2, access to another area (additional sequence) on the disc is performed in order to record the post-recording data. In FIG. 10, this access is represented as an access from the end of the video data V2 to the start of the audio data recording area 250 in another area (additional sequence), and the access takes time Tf. Then, after-recording audio data B1 is recorded in the audio data recording area 250 in another area (additional sequence), and after-recording audio data B2 is recorded in the audio data recording area 252 in another area (additional sequence). Thereafter, access is made at the time Tf from the end of the audio data recording area 252 in another area (additional sequence) to the beginning of the subsequent reproduction data in the main sequence.

  The above-described post-record editing is set as one cycle, and in the post-record editing to another area (additional sequence) according to the present embodiment, the same processing is repeated hereinafter. When one cycle of this repetitive processing is applied to each recording area from 220 to 223 in FIG. 10 and the time required for one cycle of processing is listed in the order of processing, the reproduction time TA of audio data Aj, audio data Access time Tfav from the end of Aj to the start of video data Vj, playback time TcVj of video data Vj, access time Tfva from the end of video data Vj to the start of audio data Aj + 1, playback time TA of audio data Aj + 1, audio data Access time Tfav from the end of Aj + 1 to the start of video data Vj + 1, playback time TcV (j + 1) of video data Vj + 1, and access time from the end of video data Vj + 1 to the start of audio data recording area 260 in another area (additional sequence) f, the recording time TB of the after-recording audio data Bj, the recording time TB of the after-recording audio data Bj + 1, and the access time Tf from the end of the audio data recording area 262 in another area (additional sequence) to the beginning of the next reproduction data. . The access time Tf from the end of the video data Vj + 1 to the start of the audio data recording area 260 in another area (additional sequence) includes the processing time for switching from reproduction to recording. It is assumed that the access time Tf from the end of the audio data recording area 262 of the sequence) to the start of the next playback data in the main sequence includes the processing time for switching from recording to playback.

In the above description, two sets (data blocks) composed of audio data and video data are reproduced together, and then the after-recording audio data is recorded in a separate area (additional sequence) after recording two data blocks. This process is performed in one cycle. In addition, audio data recording areas 260 and 262 in different areas (additional sequences) can be recorded continuously on the disc. However, if there is another data between the two, after-recording audio data Bj and Bj + 1 are recorded. Appropriate access time may be added during recording. By summing up the above processing times, the processing time of one cycle in post-record editing to another area (additional sequence) is obtained and is expressed by the following equation.
(Processing time for one cycle when two sets (two data blocks) are collectively subjected to post-record editing to another region (additional sequence)) = TA + Tfav + TcVj + Tfva + TA + Tfav + TcV (j + 1) + Tf + TB + TB + Tf
Here, when audio data and video data are continuously recorded adjacent to each other, Tfav and Tfva are ignored and set to 0. Further, as described with reference to FIGS. When recording audio data after recording in (additional sequence), if all audio channels are traced and TB = TA, the following equation is obtained.
(Processing time for one cycle when two sets (two data blocks) are collectively subjected to post-record editing to another region (additional sequence)) = 2 × Tf + TcVj + TcV (j + 1) + 2 × 2 × TA
Here, as in the case of post-record editing into the region described with reference to FIG. 1, the post-record establishment condition of the video data is obtained as data having the highest bit rate. When two sets (two data blocks) described with reference to FIG. 10 are subjected to post-record editing to another area (additional sequence), the size of the video data reproduced from the disc is the amount of video data Vj as YVj. If the data amount of the video data Vj + 1 is YV (j + 1), the total size of both is YVj + YV (j + 1), which is stored in the video data reproduction buffer. This accumulated data is consumed by the decoder at the bit rate of the video data. Considering the variable bit rate, if the bit rate of the video data Vj is VdVj and the bit rate of the video data Vj + 1 is VdV (j + 1), the time until the video data playback buffer is consumed by the decoder and becomes empty is
YVj / VdVj + YV (j + 1) / VdV (j + 1)
It becomes. If this time is equal to or longer than the processing time of one cycle of post-record editing obtained earlier, the post-record editing can be performed for one cycle without emptying the video data reproduction buffer. This is the condition for one post-record editing cycle for the video data playback buffer. If the recording length of the video data is TI, the time until the video data playback buffer is consumed by the decoder and becomes empty is 2 × TI. If the processing time required for one post-recording cycle is shorter than this time, post-recording editing will be established.
2.times.TI.gtoreq. (2 sets (2 data blocks) 1 cycle processing time when performing post-record editing to another area (additional sequence) together)
So, if you substitute,
2 × TI ≧ 2 × Tf + TcVj + TcV (j + 1) + 2 × 2 × TA
It becomes.

4 and FIG. 5, the time for reading one ECC block is Ts, the number of ECC blocks to be skipped in video data is a, and the number of ECC blocks to be skipped in audio data including other types of data is shown. If the number is b, the processing time TA required for recording the audio data in the previous dubbing is:
TA = N × TcA + b × Ts
It becomes. Further, the time required for reproducing the video data Vj in FIG. 10 is TcVj + a × Ts, and the time required for reproducing the video data Vj + 1 is TcV (j + 1) + a × Ts.
2 × TI ≧ {2 × Tf + (a + 2 × b) × 2 × Ts + TcVj + TcV (j + 1) + 2 × 2 × N × TcA}
It becomes. Further, when the disc recording or reproduction bit rate is Vt, the video data Vj bit rate is VdVj, the video data Vj + 1 bit rate is VdV (j + 1), and the audio data bit rate is VdA,
TcVj = TI × VdVj / Vt
TcV (j + 1) = TI × VdV (j + 1) / Vt
TcA = TI × VdA / Vt
Substituting these into conditional expressions and organizing them,
TI ≧ (2 × Tf + (a + 2 × b) × 2 × Ts) × Vt / (2 × Vt−VdVj−VdV (j + 1) −2 × 2 × N × VdA)
This is a conditional expression for establishing post-record editing to another area (additional sequence) by combining two sets (two data blocks) together.

  In the description so far, the conditions for establishing after-record editing to another area (additional sequence) in two groups (two data blocks) have been obtained. (M data blocks) The post-record editing to another area (additional sequence) may be performed collectively. This method will be described with reference to FIG.

  FIG. 11 is a diagram showing a method of performing post-record editing to another area (additional sequence) collectively for M sets (M data blocks). In FIG. 11, each of 210 to 215 and 220 to 221 is shown. The recording area is the same as that described in FIG. Also, the reproduction up to audio data A1, video data V1, audio data A2, video data V2, audio data A3, and video data V3 is the same as that described with reference to FIG. In FIG. 11, original audio data Ai, video data Vi, and post-recording audio data Bi are data corresponding to the same real time.

  In FIG. 11, the recording area consisting of areas 210 to 221... And the recording area consisting of areas 250 to 260. The recording area composed of the areas 210 to 221... Is referred to as a main sequence, and the additional sequence composed of the areas 250 to 260. Further, in the main sequence, combinations of audio data and video data in areas adjacently arranged as areas 210 and 211 and areas 212 and 213 correspond to the same real time. Thus, in the main sequence, a group of data (recording area) including a combination of audio data and video data corresponding to the same real time is defined as one data block. That is, for example, the area 210 and the area 211 are handled as one data block. On the other hand, in the additional sequence, for example, the area 250 corresponds to the same real time as the data blocks of the area 210 and the area 211 of the main sequence, and the recording area of the area 252 is the same as the data blocks of the area 212 and the area 213 of the main sequence. Corresponds to real time. In the additional sequence, each of the area 250, the area 252,... Is handled as one data block.

  When performing post-record editing to another area (additional sequence) together with M sets (M data blocks), M sets of sets (data blocks) composed of audio data and video data are reproduced. In FIG. 11, if the M-th set of data (M-th data block) is the audio data Aj and the video data Vj, in order to record the post-recording data after reproducing to the video data Vj, The audio data recording area 250 in another area (additional sequence) is accessed. Then, after-recording audio data B1 is recorded in the audio data recording area 250 of another area (additional sequence), and after-recording audio data B2 is recorded in the audio data recording area 252 of another next area (additional sequence), Thereafter, this process is repeated, and after the after-recording audio data Bj is recorded in the audio data recording area 260 of the Mth data block, the subsequent reproduction data in the main sequence is accessed.

As described above, in this embodiment, M sets (data blocks) composed of audio data and video data are reproduced, and after-record audio data corresponding to these M video data is added to another region (additional). In the sequence), only M data blocks are recorded after-recording, and this after-recording editing is repeated as one cycle. When the conditions for post-record editing to be established for another area (additional sequence) are determined together for M sets (M data blocks), the two sets (two data blocks) obtained previously are added to another area (additional sequence). ) By generalizing the conditional expression for post-record editing to
TI ≧ (2 × Tf + (a + 2 × b) × M × Ts) × Vt / (M × Vt−Σ (VdVk) −2 × M × N × VdA)
(Σ is k = 1 to M)
This is an expression for a condition that is satisfied when post-record editing is performed on another region (additional sequence) collectively for M sets (M data blocks).

  The conditional expression for performing post-record editing to another area (additional sequence) together with the above M sets (M data blocks) is as follows. Is the same as the conditional expression in the case where the term Tf (j) + M × Tfv is replaced with 2 × Tf. This means that in post-record editing within an area, access to Tf (j) is necessary to perform post-recording, and M × Tfv access is necessary to skip M pieces of video data during post-recording. On the other hand, in post-record editing to another area (additional sequence), the access time Tf to another area (additional sequence) is required to be reciprocated, that is, 2 × Tf. In other words, except for these access times, the conditional expression for post-record editing to another area (additional sequence) can be handled in the same manner as the conditional expression for post-record editing into the area. Therefore, in post-record editing to another region (additional sequence), M may be obtained by modifying the above conditional expression for M, or another region ( The value of M may be obtained so that post-record editing to (additional sequence) is established. Further, the flowchart of post-record editing to another area (addition sequence) is the part of the process of switching from access to reproduction and recording to the data to be post-recorded indicated by C40 in FIG. 12 which is a flowchart of post-record editing into the area. Is a process for switching to another area (additional sequence) and switching from playback to recording. Further, the process for accessing the next after-recording area indicated by C62 is performed by two audio data in the other area (additional sequence). If there is no data between the two, it can be expressed by using the flowchart of FIG. 12 by processing that the substantial access time does not occur.

  Note that when the value of M is increased in post-record editing according to the present embodiment, since the conditions for establishing post-recording are relaxed, there may be a case where idle time occurs after post-recording data is recorded in one cycle. After this free time, after-record data verification processing may be performed. In other words, the recorded dubbing data may be read using the idle time and compared with the dubbing data before recording. This makes it possible to reliably perform post-record editing.

  In the present invention, M may be fixed and repeated from the start to the end of post-record editing. However, M is moved every cycle according to the data amount of the recording buffer and playback buffer during post-record editing. After-recording editing may be performed while changing the pattern.

(Embodiment 3)
Hereinafter, as a third embodiment of the present invention, a case where a recording medium which has been post-record edited is played back will be described. FIG. 16 is a diagram showing the playback order in the recording / playback apparatus (editing apparatus) according to the present embodiment. It is assumed that all the recording areas shown in FIG. 16 exist on the same recording medium and that post-record editing has been completed. The schematic configuration of the recording / reproducing apparatus according to the present embodiment is the same as that shown in FIG. The following playback procedure is realized by the control unit 650 controlling the operation of the pickup 610.

  In FIG. 16, G10, G12, G20, G22, and G30 represent audio data recording areas, and G11, G13, G21, G23, and G31 represent video data recording areas. These audio data recording areas and video data recording areas are alternately arranged adjacent to each other on the recording medium. Although omitted in FIG. 16, a plurality of sets of audio data recording areas and video data recording areas are arranged between G13 and G20, between G23 and G30, and behind G31. Yes.

  In FIG. 16, G50, G52, G60, G62, and G70 represent audio data recording areas. In these audio data recording areas, additional audio data used in post-record editing or the like is recorded. In this embodiment, these recording areas are referred to as audio data in a different area (additional sequence) with respect to the recording areas (main sequence) of G10 to G31. Each recording area from G50 to G70 is composed only of an audio data recording area, and no video data recording area exists between the recording areas. Although omitted in FIG. 16, there are a plurality of audio data recording areas between G52 and G60, between G62 and G70, and also behind G70.

  The recording areas G10 to G31... And the recording areas G50 to G70... Are arranged at positions separated from each other on the recording medium. Hereinafter, the recording areas G10 to G31... Are referred to as a main sequence, and the recording areas G50 to G70. In the main sequence, combinations of audio data and video data alternately arranged adjacent to each other like G10 and G11 and G12 and G13 correspond to the same real time. Thus, in the main sequence, a group of data (recording area) including a combination of audio data and video data corresponding to the same real time is defined as one data block. That is, for example, G10 and G11 are handled as one data block. On the other hand, in the additional sequence, for example, the G50 recording area corresponds to the same real time as the main sequence G10 and G11 data blocks, and the G52 recording area corresponds to the main sequence G12 and G13 data blocks. Correspond. In the additional sequence, each recording area of G50, G52... Is handled as one data block.

  In addition, as described with reference to FIG. 4, in one audio data recording area, the inside of the recording area is divided into a plurality of areas so that audio data of a plurality of audio channels can be recorded. Here, in FIG. 16, the audio data recording areas G50 to G70 correspond to the case where N = 4 in FIG. 4A, and the inside of each recording area is 4-channel audio data of ch1 to ch4. Are divided into recording areas. Of these, assume that ch3 and ch4 are used during playback. That is, for audio data in another area (additional sequence), the audio data in recording areas 417 and 418 in FIG. 4A is used during reproduction.

  In addition, as described with reference to FIG. 5, there are cases where a recording area for various data is adjacent to the audio data recording area. In particular, in the case shown in FIG. 5B, the recording area 540 for the various data Lj is adjacent to the audio data recording area 411 for ch1. Since various data includes information related to audio data and video data, it is necessary to read the various data at the time of reproduction. Here, in FIG. 16, the audio data recording areas G10, G12, G20, G22, and G30 correspond to the case where N = 4 in FIG. 5B, and the inside of each recording area is from ch1 to ch4. It is assumed that the recording area is divided into four channels of audio data, and that the recording area 540 of the various data Lj is adjacent to the recording area 411 of ch1. Of these, it is assumed that various data Lj and audio data ch1 and ch2 are used during reproduction.

  A case where reproduction is performed based on the above assumption will be described. In FIG. 16, first, reproduction starts from the middle of the recording area G10. Then, access is made toward the middle of the recording area G50 at a point before the end of the recording area G10. The playback order so far will be described with reference to FIG. In FIG. 5B, various data are recorded in the recording area 540. Considering a general case, since the playback start point does not necessarily coincide with the beginning of each recording area, the playback start point is assumed to be in the middle of the recording area 540, and various data from the middle to the end of the recording area 540 are obtained. Read Lj. Next, in FIG. 5B, the audio data ch1 in the recording area 411 and the audio data ch2 in the recording area 412 are also reproduced from the middle of the recording area. However, since the amount of audio data is small, unnecessary data from the end of the various data Lj to the middle of the audio data ch1 (starting point of reproduction) may be skipped by access means such as fine seek. The start point of the audio data ch1 may be reached while waiting for rotation. Similarly, from the end of the audio data ch1, the middle of the audio data ch2 (reproduction start point) may reach the reproduction start point of the audio data ch2 while waiting for rotation. After reading to the end of the audio data ch2, the audio data of other channels adjacent to the back of the recording area is not used for reproduction, and therefore, from the end of the audio data ch2 to the audio data of another area (additional sequence). Access operation.

  In FIG. 16, after accessing the recording area G50, which is a recording area for audio data in another area (additional sequence), data is read to the end of the recording area G50, and further, the recording area G52 and the recording area G60 are read. Read data to the end. Then, an access operation is performed from the end of the recording area G60 toward the middle of the recording area G11 of the main sequence. The playback order so far will be described with reference to FIG. When N = 4 in FIG. 4A, the recording area 417 corresponds to the audio data ch3 recording area, and the recording area 418 corresponds to the audio data ch4 recording area. If the playback start point of the audio data ch3 is also in the middle of the recording area 417, the access destination for the audio data in another area (additional sequence) will land in the middle of the recording area 417, and the audio data ch3 Data is read from the middle to the end. Assuming that the start point of reproduction of the next audio data ch4 is also in the middle of the recording area 418, the start point of reproduction of the audio data ch4 may be reached while waiting for rotation as in the above case. Data is read up to the end of the recording area 418.

  In FIG. 16, after the data is read up to the end of the recording area G50, the data in the next recording area G52 is read. At this time, since the recording area G52 has the same internal configuration as that shown in FIG. 4A, the audio data ch3 and ch4 required for reproduction are arranged in the rear portion of the recording area. The recording areas 411 and 412 in FIG. 4A are audio data that is not used for reproduction. However, as described above, the recording areas 411 and 412 may reach the beginning of the recording area 417 while waiting for rotation. Then, the audio data in the recording areas 417 and 418 is read. As a result, the operation of reproducing the audio data ch3 and ch4 is repeated while skipping unnecessary data portions while waiting for rotation without performing access such as fine seek, so the reproduction order in FIG. 16 is the start of the recording area G52. To the end of the recording area G60.

  Further, in FIG. 16, access is performed from the end of the recording area G60 toward the middle of the recording area G11. The middle of the recording area G11 means the position of data necessary for the start point of reproduction of the video data V1 in the recording area G11. This is because, for example, when the video data is in a compression format with frame correlation such as MPEG, it may be necessary to read data several frames before the playback start point in order to decode the frame at the playback start point. It means that. Accordingly, it is assumed that the access destination to the recording area G11 is to access the start position of the data necessary for the start point of reproduction of the video data V1, not the start point of reproduction of the video data V1. After the data is read from the middle to the end of the recording area G11, the next recording area G12 is accessed. At this time, if there is data unnecessary for reproduction between the end of the video data V1 in the recording area G11 and the start of various data in the recording area G12, the data is indicated by the access time Tfva in FIG. Unnecessary data may be skipped by an access means such as fine seek or may be skipped while waiting for rotation. Further, in the recording area G12, as shown in FIG. 5B, the various data Lj and the audio data ch1 and ch2 are read out. After that, the audio data of other channels adjacent to the rear of the recording area 412 in FIG. 5B is not necessary for reproduction, so it may be skipped while waiting for rotation to reach the next data, fine seek, etc. You may skip reading with the access means. This skipped portion is represented by an access time Tfav between the recording areas G11 and G12 in FIG. Hereinafter, data is read up to the recording areas G13, G20, and G21 while skipping the reading process.

  Next, after reading various data and audio data ch1 and ch2 in the recording area G22 of FIG. 16, access is made toward the middle of the audio data recording area G62 of another area (additional sequence). This will be described with reference to FIGS. 4 and 5. FIG. Since the inside of the recording area G22 in FIG. 16 corresponds to FIG. 5B, the data in the recording areas 540, 411, and 412 is read out in FIG. 5B. Since audio data of other channels arranged behind the recording area 412 are not necessary for reproduction, an access operation can be performed from there after reading the data to the end of the recording area 412. The recording area of audio data in another area (additional sequence) of the access destination corresponds to FIG. Since the recording areas 417 and 418 when N = 4 in FIG. 4A are the audio data of ch3 and ch4 necessary for reproduction, the access destination is the audio of ch3 in the recording area 417 of FIG. 4A. Land at the beginning of the data. Then, the audio data ch3 in the recording area 417 and the audio data ch4 in the recording area 418 are read. With the processing so far, data has been read up to the recording area G62 in FIG. After the recording area G62, data is read up to the recording area G70. In the recording areas G62 to G70, since the inside of the recording area corresponds to FIG. 4A, only the recording areas 417 and 418 in FIG. 4A are read. Other recording areas 411 and 412 are data unnecessary for reproduction, and may be skipped while waiting for rotation. As a result, in FIG. 16, all traces are made up to the end of the recording area G70 after accessing the middle of the recording area G62. In FIG. 16, after the data is read to the end of the recording area G70, access is made toward the beginning of the video data Vj + 1 in the recording area G23. Then, data is read from the beginning to the end of the video data Vj + 1. Thereafter, the same processing as described above is repeated for the recording areas G30 and G31 and the subsequent recording areas.

  In the playback order described above, a plurality of audio data in a different area (additional sequence) are read out in batches (a plurality of data blocks) in the same manner as when recording after-recording editing in another area (additional sequence), and the audio is recorded. A plurality of audio data and video data (for a plurality of data blocks) are collectively read out from an area where data and video data are alternately arranged. This reduces the number of accesses to audio data in another area (additional sequence). The following describes how many recording areas should be read together in these reproduction processes.

  At the time of reproduction, as in the case of recording, the data consumption of the decoder is faster as the data has a higher bit rate. Therefore, the condition for establishing reproduction is focused on the condition of video data having the highest bit rate. Video data read from the recording medium is accumulated in a buffer, and the video data accumulated in the buffer is consumed by a decoder for reproduction. In order for the playback video to be uninterrupted, it is necessary that the video data in the buffer does not become empty during playback.

  In FIG. 16, the reading of the video data is started from the recording area G11. The time required for reading out the necessary video data in the recording area G11 is TcV1. Next, the time for accessing the necessary data in the recording area G12 is set to Tfva, and the time for reading the necessary data in the recording area G12 and waiting for the rotation until the next data is set to TA. The access time from the end of the recording area G12 to the beginning of the recording area G13 is assumed to be Tfav. The reading time of the video data V2 in the recording area G13 is TcV2. In consideration of the case where the video data has a variable bit rate in each video data recording area, it is assumed that j is an integer of 1 or more and j is a subscript to read video data Vj. Let time be represented by TcVj. TA is also used to read the necessary data in the recording area G20 and wait for rotation until the next data. Let TA (j + 1) be the data read time of a necessary portion in the recording area G22. Thereafter, the access time to the necessary data in the recording area G62 is Tf. Let TB (j + 1) be the read time of necessary data in the recording area G62 and the waiting time for rotation until the next data. Hereinafter, the time until rotation until the next data, up to the recording area G70, and the reading time of necessary data are set as TB, respectively. Then, Tf is a time for accessing from the end of necessary data in the recording area G70 to the beginning of necessary data in the recording area G23. Thereafter, the read time of necessary data in the recording area G23 is set to TcV (j + 1).

  Of the above processing times, assuming that the time required for reading video data is Tsv, Tsv is expressed by the following equation.

Tsv = TcV1 + TcV2 + ... + TcVj + TcV (j + 1) = Σ (TcVi)
(Where Σ is i = 1 to (j + 1))
In FIG. 16, if the processing time other than the video data reading is Tnv in the period from the start of reading the video data V1 to the end of reading the video data V (j + 1), Tnv is within the above period. Tnv is expressed by the following equation, since it is the total time of the readout time, rotation waiting time, and access time of various data and audio data.

Tnv = Tfva + TA + Tfav + ... + Tfva + TA + Tfav + Tfva + TA (j + 1) + Tf + TB (j + 1) + TB + ... + TB + Tf
Organizing the above formula,
Tnv = Tfva × j + TA × (j−1) + Tfav × (j−1) + TA (j + 1) + TB (j + 1) + TB × (j−1) + Tf × 2
Furthermore, assuming that the audio data recording area and the video data recording area are continuously arranged in FIG. 16 and the access time Tfav = 0,
Tnv = Tfva × j + (TA + TB) × (j−1) + TA (j + 1) + TB (j + 1) + Tf × 2
It becomes.

Also, assuming that the total amount of read video data is YV and the bit rate of the video data is VdV, the time until all the read video data is consumed by the decoder is
YV / VdV
It becomes. If the total readout processing time is shorter than this time, the video data buffer will not be emptied during playback.
YV / VdV ≧ Tsv + Tnv
If is established, the video can be reproduced without interruption. Since Tsv and Tnv on the right side of the above expression are expressions of j, the value of j satisfying this conditional expression corresponds to the number of areas read out together during reproduction.

  Further, in the playback order of the present embodiment, after reading the various data and audio data ch1 and ch2 existing in the recording area G10 of FIG. 16, the video data of the adjacent recording area G11 is not read first. Another feature is that access is made in the middle of the recording area G50, which is audio data in another area (additional sequence), and ch3 and ch4 of audio data in another area (additional sequence) are read out first.

  The reason for this will be described below. In general, video data has a larger data size than audio data for the same amount of time, and therefore video data requires more time to read data from a recording medium. Since the playback process needs to output the video and audio in synchronization, the video and audio are output when all the audio data for the required audio channel is available, as well as the video data. can do. Here, consider a case where a playback order different from that of the present embodiment is performed. In FIG. 16, it is assumed that G11, G12, G13, G20, G21, and G22 are read out in order from the recording area G10. At this time, only ch1 and ch2 of video data, various data, and audio data are read out. Accordingly, since the remaining audio data ch3 and ch4 are not yet available, video and audio cannot be output at this point. For the remaining audio data ch3 and ch4, when the recording area G50 is further read, video and 4-channel audio can be simultaneously output. Since data reading from the recording areas G10 to G22 includes video data, it takes time to read the data. On the other hand, in the reproduction order of the present embodiment, after the main sequence recording area G10 is read, the additional sequence recording areas G50 to G60 are read first. Therefore, at this time point, the audio data ch1 and ch2 of the recording area G10 exist in the buffer, and the audio data ch3 and ch4 of the recording areas G50 to G60 exist in the buffer. Accordingly, when the video data in the recording area G11 is read, the video data and the audio data for four channels are prepared, so that video and audio can be output. Since the recording areas G50 to G60 are audio data, the time required for reading is short. Therefore, the reproduction order of this embodiment has an effect that the output of video and audio can be started early in the reproduction process.

  In addition, a memory such as a buffer for holding the read data is required from when the data is read until it is output as video or audio. As described above, when video data is first read by a method different from that of the present embodiment, it is necessary to hold the previously read video data until the audio data for four channels is prepared. In general, video data has a larger data size than audio data for the same amount of time, so a large buffer is required to hold the video data. In the playback order of the present embodiment, audio data is read before video data. Therefore, since it is sufficient to hold audio data having a size smaller than that of video data, there is an effect that a buffer size for holding read data can be reduced.

  According to the present invention, a process of reproducing M sets of audio data and video data and then recording the M audio data after-recording is defined as one cycle. As a result, an effect of enabling post-record editing even for a disc for which post-record editing has not been achieved by the conventional method is obtained, and the post-record editing recording on the information recording medium and the information recording medium recorded after the post-record editing are performed. This is useful for a recording / reproducing apparatus capable of reproduction.

The figure showing the method of post-recording edit in the area | region concerning one Embodiment of this invention A one-dimensional representation of a portion of the arrangement of audio data recording areas and video data recording areas on a disc Diagram showing an example of conventional post-record editing method Diagram showing details of audio data recording area Diagram showing details of recording area for audio data and other types of data The figure showing the edit model concerning one Embodiment of this invention A diagram showing the time change of the data amount of the recording and playback buffer The figure showing the method of performing post-record editing to the area | region collectively for M sets concerning one Embodiment of this invention. A figure showing an example of a conventional post-record editing method for another area The figure showing the method of the post-recording edit to another area | region (additional sequence) concerning one Embodiment of this invention. The figure showing the method of performing post-record editing to another area (additional sequence) collectively M group concerning one embodiment of the present invention The flowchart showing the contents of post-record editing processing according to an embodiment of the present invention The figure showing the structure of the recording / reproducing apparatus concerning one Embodiment of this invention A diagram showing the disk device access model The figure which represented the conditional expression of the after-recording edit concerning one Embodiment of this invention with the graph The figure showing the order of reproduction | regeneration in the recording / reproducing apparatus concerning one Embodiment of this invention

Explanation of symbols

210, 212, 214, 220, 222, 240 Audio data recording area 211, 213, 215, 221, 223, 241 Video data recording area 250, 252, 254, 260, 262, 270 Audio data in another area (additional sequence) Recording area 411, 412, 417, 418 Recording area for each channel of audio data 530, 540 Other data recording area 600 Disc 610 Pickup 620 Decoder A
630 Decoder B
640 Encoder C
625 Playback buffer A
635 Playback buffer B
645 Recording buffer C
650 Control unit 710 Time change of data amount of reproduction buffer A 720 Time change of data amount of reproduction buffer B 730 Time change of data amount of recording buffer C

Claims (1)

An information recording medium recording / reproducing apparatus for independently recording video data and audio data,
In the information recording medium, there is an additional sequence in which data blocks including after-recording audio data are continuously recorded in a different area from the main sequence in which data blocks including original audio data and video data are continuously recorded. Formed,
The recording / reproducing apparatus comprises:
A pickup for recording or reproducing information on an information recording medium;
A control unit for controlling the operation of the pickup,
During reproduction of the information recording medium, the control unit
When each of M (M is an integer of 2 or more) data blocks corresponding to the same real time is read from the main sequence and the additional sequence,
(1) The original audio data is reproduced from the first block of the M data blocks in the main sequence,
(2) Playing back audio data continuously from M data blocks in the additional sequence corresponding to the M data blocks in the main sequence;
(3) Play back the video data of the first block in the main sequence;
(4) To reproduce original audio data and video data from (M-1) data blocks in the main sequence,
A recording / reproducing apparatus for controlling an operation of the optical pickup.

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