JP4169577B2 - Audio / video information recording / reproducing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio / video information recording / reproducing apparatus and method for compressing video signals and audio signals and recording them on a recording medium such as an optical disk.
[0002]
[Prior art]
As a method for compressing video at a low bit rate, there is a system stream defined by the MPEG2 standard (ISO / IEC 13818-1). Three types of system streams are defined: program stream, transport stream, and PES stream.
[0003]
On the other hand, optical disks such as phase change optical disks (for example, DVD-RAM and MVDISC) and magneto-optical disks (MO) have been attracting attention as recording media replacing magnetic tapes. For example, there is a VIDEO RECORDING standard (DVD Specifications for Rewritable / Re-recordable Discs Part 3 VIDEO RECORDING Version 1.0 September 1999) as a standard for recording video on a DVD-RAM. This standard is for recording and reproducing a video file composed of a program stream of the MPEG2 standard on a DVD-RAM disk. In the following, the video recording standard is described by replacing the phase change optical disc (hereinafter referred to simply as “optical disc” unless otherwise confused) with a video file composed of an MPEG2 transport stream. The conventional technical contents will be explained in a form including the technical contents of. The video is MPEG2 compression of ISO / IEC 13818-1, and when audio is compressed, it is compressed by MEPG2-AAC (Advanced Audio Cording) of ISO / IEC 13818-7.
[0004]
FIG. 16 shows a block diagram of a conventional audio / video information recording / reproducing apparatus using a phase change optical disk. When recording a video signal and an audio signal, the signals input from the video signal input unit 100 and the audio signal input unit 102 are compressed by the video compression unit 101 and the audio compression unit 103, respectively, and then post-processed by the transport stream assembly unit 104. The dummy packet generated by the recording dummy packet generator 105 is mixed with the compression result to create a transport stream, which is written to the phase change optical disc 131 via the buffer memory 154, the recording unit 120, and the pickup 130.
[0005]
At the time of reproduction of the video signal and the audio signal, the transport stream taken out via the pickup 130, the reproduction unit 121 and the buffer memory 154 is separated into the video signal and the audio signal by the transport stream decomposing unit 115, and each video expansion unit The video data is output to the video display unit 110 and the audio output unit 112 via the 111 and the first audio decompression unit 113. The second audio decompression unit 114 is used to reproduce the back audio when back audio (described later) is recorded in the transport stream.
[0006]
When recording the video signal and the audio signal, the recording control unit 151 controls the recording unit 120, the continuous data area detection unit 150, and the logical block management unit 141 to perform recording. At this time, the continuous data area detection unit 150 checks the usage status of the sectors managed by the logical block management unit 141 in accordance with an instruction from the recording control unit 151 and detects physically continuous free areas.
[0007]
At the time of reproducing the video signal and the audio signal, the reproduction control unit 140 controls the reproduction unit 121 and the recording unit 120 to perform reproduction. Further, the post-recording recording control unit 152 and the post-recording reproduction control unit 153 are activated during post-recording to be described later.
[0008]
Hereinafter, “recording of video signal and audio signal” is referred to as “recording of moving image signal”. Similarly, “video and audio recording” is referred to as “video recording”.
[0009]
FIG. 17 shows a recording format when video is recorded on the phase change optical disc 131 in real time. The phase change optical disk 131 is composed of 2 kbyte sectors, 16 sectors are handled as one logical block (32 kbytes), an error correction code is assigned to each logical block, and the phase change optical disk 131 is recorded. Furthermore, a physically continuous logical block of a specific time (for example, 0.86 seconds as described later) or more in terms of the maximum recording / reproducing rate is secured as one continuous data area. A video object unit (Video Object Unit: hereinafter referred to as “VOBU”) composed of an MPEG transport stream having a playback time (display time) of one second is sequentially recorded. One VOBU includes video and audio compressed data that can be decoded independently in principle. That is, it is assumed that the video and audio compression data are completed within 1 VOBU.
[0010]
One VOBU is composed of transport packets that are lower layers of an MPEG transport stream of 188 bytes. The transport packet is composed of three types: a video transport packet (V_TSP) in which compressed video data is stored, an audio transport packet (A_TSP) in which audio compressed data is stored, and a dummy audio transport packet (D_TSP). Is done. One VOBU includes all V_TSP, A_TSP, and D_TSP for the corresponding time. Also, the data size of one VOBU varies within a range equal to or less than the maximum recording / reproducing rate if the video is a variable bit rate. On the other hand, if the video is a fixed bit rate, the data size of the VOBU is almost constant.
[0011]
FIG. 18 is a diagram illustrating details of V_TSP, A_TSP, and D_TSP. V_TSP is composed of a transport packet header and video data, A_TSP is composed of a transport packet header and audio data, and D_TSP is composed of a transport packet header and back audio dummy data. Differences between V_TSP, A_TSP, and D_TSP are identified by PID (Packet ID) in the transport packet header. For example, as shown in the figure, PID = "0x0020" is assigned to V_TSP, PID = "0x0021" is assigned to A_TSP, and PID = "0x0022" is assigned to D_TSP.
[0012]
The continuous data area detection unit 150 of the audio / video information recording / reproducing apparatus shown in FIG. 16 performs redetection of the next continuous data area when the remaining one continuous data area becomes small. When one continuous data area becomes full, data is written to the next continuous data area.
[0013]
FIG. 19 shows a state in which the recorded content on the optical disc is managed by a UDF (Universal Disk Format) file system. Here, a case where one MPEG transport stream is recorded as a file “MOVIE.MPG” by one on / off operation of the recording start button is shown. In the file, the file name and the position of the file entry are managed by an FID (File Identifier Descriptor). Further, an allocation descriptor (Allocation Descriptor) in the file entry is used to manage one file and three continuous data areas a, b, and c constituting the file. The process of dividing the continuous data area into three is as follows. As shown in FIG. 20, the structure of each allocation descriptor includes an extent length (Extent Length) and an extent position (Extent Position).
[0014]
When the recording control unit 151 finds a defective logical block during recording in the continuous data area a, the recording control unit 151 skips the defective logical block and continues writing from the beginning of the continuous data area b. Further, if the recording control unit 151 is likely to collide with the recording area of the PC file during recording in the continuous data area b, the recording control unit 151 continues writing from the beginning of the continuous data area c. As a result, the file “MOVIE.MPG” is composed of three continuous data areas a, b, and c.
[0015]
FIG. 21 shows an outline of the operation during file reproduction. During reproduction, the reproduction control unit 140 simultaneously performs an operation of reading data from the optical disk 131 to the buffer memory 154 and an operation of reproducing data by moving data from the buffer memory 154 to the transport stream decomposing unit 115. At this time, the data reading speed Vr is set to be higher than the data reproducing speed Vo, and control is performed so that there is no data to be reproduced in the buffer memory 154 (underflow). . Therefore, if continuous data reading and continuous data reproduction are continued, extra data to be reproduced can be secured by the speed difference between the data reproduction speed Vo and the data read speed Vr. By using such extra data that can be secured as reproduction data while data reading is interrupted by the jump of the pickup 130, continuous reproduction can be realized.
[0016]
Specifically, when the data reading speed Vr is 24 Mbps, the data reproduction speed Vo is 10 Mbps, and the maximum movement time of the pickup 130 is 0.5 seconds, extra reproduction data of 5 Mbits is required during the movement of the pickup. In order to secure such extra reproduction data, continuous reading for 0.36 seconds is required. That is, it is necessary to read continuously for a time obtained by dividing 5 Mbit by the difference between the data reading speed of 24 Mbps and the data reproduction speed of 10 Mbps.
[0017]
Here, during continuous reading for 0.36 seconds, reproduction data for 8.6 Mbits, that is, 0.86 seconds in terms of a reproduction speed of 10 Mbps is read. Therefore, it is possible to guarantee continuous data reproduction by securing a continuous data area of 0.86 seconds or more while recording a moving image of a maximum of 10 Mbps.
[0018]
Note that the maximum movement time of the pickup 130 indicates the movement time between the innermost circumference and the outermost circumference of the disc. In addition, the rotation waiting time is included in this time.
[0019]
There may be several defective logical blocks in the middle of the continuous data area. However, in this case, it is necessary to reserve a continuous data area slightly longer than 0.86 seconds in anticipation of the reading time required for reading the defective logical block during reproduction.
[0020]
One of the functions that is usually provided in consumer movies is post-recording. The post-recording is a function for dubbing once recorded video audio (hereinafter referred to as front audio) to newly recorded audio (hereinafter referred to as back audio).
[0021]
Post recording generally consists of the following three steps. As a first step, first, a video is recorded in a recording mode capable of post-recording (hereinafter referred to as “post-recording mode recording”). As a second step, while watching the recorded video, the back audio synchronized with the video is recorded (hereinafter referred to as “post-recording recording”). As a third step, the video and back audio in the second step are reproduced in synchronization (hereinafter referred to as “post-recording reproduction”). Dubbing is realized in these steps.
[0022]
Here, in the first step, the post-recording recording control unit 152 records an MPEG transport stream including V_TSP, A_TSP, and D_TSP (see, for example, Patent Document 1). In the second step, the post-recording recording control unit 152 records the data on the optical disc 131 by replacing D_TSP with the back audio A_TSP. In the third step, the post-recording playback control unit 153 performs control so as to pass the front audio A_TSP, the back audio A_TSP, and the V_TSP to the transport stream decomposing unit 115 to realize dubbing.
[0023]
In the following, a file including video and audio recorded during post-recording mode recording is referred to as a moving image file.
[0024]
When there is no need for post-recording, a moving image file composed of A_TSP and V_TSP is recorded without including D_TSP.
[0025]
Further, when the playback control unit 140 plays back a moving image file recorded in the post-recording mode, A_TSP and V_TSP are passed without passing D_TSP to the transport stream decomposing unit 115.
[0026]
[Patent Document 1]
International Publication No. 01/04893 Pamphlet (Fig. 11)
[0027]
[Problems to be solved by the invention]
When recording back audio while watching video during post-recording recording, it is necessary to perform re-recording processing of video including back audio simultaneously with video playback processing. Specifically, a stream to be played back by the post-recording playback control unit 153 is stored in a buffer, and D_TSP in the stream is replaced with A_TSP for back audio, and is written back on the disk again. That is, it is necessary to simultaneously perform continuous recording at the same rate as continuous playback at the video recording rate. In order to realize this simultaneous recording / reproducing process, it is necessary to realize a high transfer rate and a high-speed seek time, and an expensive disk drive is necessary.
[0028]
Therefore, in order to solve the above problems, the present invention can easily realize a post-recording function on an optical disk even with an inexpensive disk drive having a relatively slow seek time, and at the same time, edits such as combination and division of audio files. An object of the present invention is to provide an audio / video information recording / reproducing apparatus and method capable of easily realizing
[0029]
[Means for Solving the Problems]
In order to achieve the above object, a first audio / video recording / playback apparatus according to the present invention records a video information as a video file on a recording medium, and records the audio information as an audio file on the recording medium. Audio having an audio recording unit, a video reproducing unit that continuously reproduces video information recorded on a recording medium in real time, and a post-recording recording unit that reproduces video information and simultaneously records audio information related to the video information / Video information recording / playback apparatus, wherein the video recording unit redundantly stores video information for a total time of three times the maximum movement time of the read / write head and the time for reading one audio continuous data area. Video continuous data area detection that detects video continuous data areas that consist of a plurality of physically continuous recording units that can record video information for more than the time required to secure it. And a video recording control unit for instructing a recording unit number of a video continuous data area in which video information is to be recorded. The audio recording unit includes a plurality of physically continuous recording units capable of recording audio information. And a voice continuous data area detecting unit for detecting a voice continuous data area whose data size falls within a predetermined range, and voice recording control for continuously recording voice information on a plurality of voice continuous data areas The video recording unit records video information, and the post-recording recording unit alternately plays back the video information recorded in the video continuous data area and records the audio information in the audio continuous data area. In the meantime, the real-time continuous reproduction of the video information and the recording of the audio information are performed simultaneously.
[0030]
In the first audio / video information recording / reproducing apparatus, the post-recording recording unit preferably further records boundary information indicating the boundary of the audio continuous data area together with the audio information.
[0031]
In order to achieve the above object, a second audio / video recording / playback apparatus according to the present invention records a video information on a recording medium as a video file, and records the audio information on the recording medium as an audio file. An audio recording unit, a video reproducing unit that continuously reproduces the video information recorded on the recording medium in real time, an audio reproducing unit that reproduces the audio information recorded on the recording medium in real time, and simultaneously reproduces the video information. An audio / video information recording / reproducing apparatus having a post-recording reproducing unit for reproducing audio information related to the video information, wherein the video recording unit has a time three times the maximum movement time of the read / write head, Multiple physically continuous records that can record video information for more than the time required to reserve extra video information for the total time of reading the continuous audio data area A video continuous data area detecting unit for detecting a video continuous data area consisting of a position and a video recording control unit for instructing a recording unit number of a video continuous data area in which video information is to be recorded. An audio continuous data area detecting unit configured to detect an audio continuous data area including a plurality of physically continuous recording units capable of recording audio information and having a data size within a predetermined range; An audio recording control unit that continuously records audio information on the audio continuous data area, the video recording unit records video information, the audio recording unit records audio information related to the video information, and While the recording playback unit alternately reads the video information recorded in the video continuous data area and the audio information recorded in the audio continuous data area, the video and audio are simultaneously and continuously reproduced in real time. Characterized in that it.
[0032]
In the second audio / video information recording / reproducing apparatus, the audio recording unit further records boundary information indicating the boundary of the audio continuous data area together with the audio information, and the post-recording reproducing unit further stores the audio information in the audio continuous data area. It is preferable to refer to the boundary information when reading the recorded audio information.
[0033]
In order to achieve the above object, a first audio / video recording / reproducing method according to the present invention records video information as a video file on a recording medium and simultaneously reproduces the video information recorded on the recording medium in real time. The audio / video information recording / reproducing method for recording audio information related to video information as an audio file on a recording medium, which reads three times the maximum movement time of the read / write head and one continuous audio data area A step of detecting a continuous video data area composed of a plurality of physically continuous recording units capable of recording video information for a time longer than the time required to secure extra video information for a total amount of time And a step of designating a recording unit number of a video continuous data area in which video information is to be recorded, and a plurality of physically continuous recording units capable of recording audio information, Including a step of detecting a continuous audio data area whose size is within a predetermined range and a step of continuously recording audio information on a plurality of continuous data areas for audio, and recorded in the continuous video data area. It is characterized in that real-time continuous reproduction of video information and recording of audio information are simultaneously performed while alternately reproducing video information and recording audio information in a continuous audio data area.
[0034]
Preferably, the first audio / video information recording / reproducing method further includes a step of recording boundary information indicating a boundary of the audio continuous data area together with the audio information.
[0035]
In order to achieve the above object, a second audio / video recording / playback method according to the present invention records video information as a video file on a recording medium, records the audio information as a voice file on the recording medium, and records it on the recording medium. An audio / video information recording / reproducing method for simultaneously reproducing recorded video information and audio information simultaneously in real time, which is three times as long as the maximum movement time of the read / write head and time for reading one continuous data area for audio Detecting a video continuous data area composed of a plurality of physically continuous recording units capable of recording video information for a time longer than the time required to secure extra video information for a total time of And a step of designating a recording unit number of the video continuous data area in which video information is to be recorded, and a plurality of physically continuous recording units capable of recording audio information, and having a data size. Including a step of detecting a continuous data area for audio such that is within a predetermined range, and a step of continuously recording audio information on a plurality of continuous data areas for sound, and recorded in the continuous data area for video The video and audio are simultaneously reproduced in real time simultaneously while alternately reading the video information and the audio information recorded in the audio continuous data area.
[0036]
The second audio / video information recording / reproducing method further includes a step of recording boundary information indicating the boundary of the continuous audio data area together with the audio information, and the audio recorded in the continuous audio data area with reference to the boundary information. And a step of reading information.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0038]
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of an audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention. The difference between this embodiment and the conventional example (FIG. 16) is that it has a second transport stream decomposing unit 166, a continuous data area detecting unit 160, a recording control unit 161, a post-recording recording control unit 162, and a post-recording. The playback control unit 163 and the buffer memory 164 have different functions. Further, the data reading speed of the reproducing unit 121, the maximum reproduction rate of the same image data input to the first transport stream decomposing unit 165, and the maximum movement time during the reading operation and the writing operation of the pickup 130 are the same as in the conventional example. It is supposed to be.
[0039]
FIG. 2 shows blocks related to the post-recording mode recording in the functional blocks of FIG. 1, and FIG. 3 shows blocks related to the post-recording recording in the functional blocks of FIG. FIG. 4 is a diagram showing blocks related to the post-recording reproduction among the functional blocks in FIG.
[0040]
FIG. 5 is a diagram showing a recording form of video and audio in the audio / video information recording apparatus according to Embodiment 1 of the present invention. The difference from FIG. 17 showing the conventional example is only that the length of the continuous data area (2.6 seconds or more) is different. Other points (for example, a point where VOBU is composed of V_TSP, A_TSP, and D_TSP) are the same.
[0041]
FIG. 6 is a diagram showing a recording form of a back audio file to be recorded at the time of post-recording recording in Embodiment 1 of the present invention. The back audio file is composed of A_TSP in which the back audio is encoded. More specifically, a transport stream is configured by adding a transport packet header to audio data that has been subjected to AAC (Advanced Audio Coding) compression coding. In addition, the transport stream is continuously recorded in a plurality of continuous data areas having a fixed length of 96 kbytes secured on the optical disc 131. Each 96 kbyte may be physically separated from each other. Although omitted in FIG. 6, PAT, PMT, and the like are essential packets for the transport stream and are included in the back audio file.
[0042]
FIG. 7 is a diagram showing an operation model at the time of post-recording recording in Embodiment 1 of the present invention. The moving image data recorded on the optical disc 131 is taken into the moving image buffer memory via the pickup 130 at the speed Vr, and the moving image data is further transferred to the transport stream decomposing unit 165 at the speed Vout. The first audio decompression unit 113 reproduces video and audio. On the other hand, the audio signal is converted into audio data by the audio compression unit 103 and then taken into the audio buffer memory via the transport stream assembling unit 104 at the speed Ain. Further, the audio data is written onto the optical disc 131 via the pickup 130 at the speed Aw. Reading of moving image data and writing of audio data are realized by alternately switching one pickup 130 in a time division manner. Here, it is assumed that Vr> Vout and Aw> Ain.
[0043]
FIG. 8 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory at the time of post-recording recording in Embodiment 1 of the present invention. In FIG. 8, t _seek Is the maximum travel time of the pickup 130, t _Awrite Is the writing time of the back audio file, t _V-CDA Indicates the readout time of the continuous data area for moving images. B _A-th Is a threshold when starting a seek operation for writing audio data. The code amount in the audio buffer memory is B _A-th In such a case, the pickup 130 starts moving from the moving image data to the back audio data. In the first embodiment, B _A-th Is 96 kbytes.
[0044]
FIG. 9 is a diagram showing an operation model at the time of post-recording reproduction according to Embodiment 1 of the present invention. The moving image data recorded on the optical disc 131 is taken into the moving image buffer memory at the speed Vr via the pickup 130, and further, the moving image data is transferred to the transport stream decomposing unit 165 at the speed Vout and further decompressed. Is reproduced as video and audio by the unit 111 and the first audio expansion unit 113. On the other hand, the back audio data recorded on the optical disc 131 is taken into the audio buffer memory at the speed Ar via the pickup 130, and the back audio data is further sent via the transport stream decomposing unit 166 at the speed Aout. The second audio expansion unit 114 reproduces the back audio. Here, Vr> Vout and Ar> Aout.
[0045]
FIG. 10 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction according to Embodiment 1 of the present invention. B _V Is the video buffer memory size, B _A Indicates the audio buffer memory size.
[0046]
FIG. 37 is a conceptual diagram of a continuous data area. The minimum moving image continuous data area includes video data corresponding to the total time of the time required to read the minimum double audio continuous data area and the maximum seek time for two times. On the other hand, the minimum audio continuous data area includes audio data corresponding to the total time of the time required to read the minimum double video continuous data area and the maximum seek time for two times.
[0047]
When recording in the post-recording mode, the function block of FIG. 2 is used. The recording control unit 161 controls the recording unit 120, the continuous data area detection unit 160, and the logical block management unit 144, and performs post-recording mode recording. At this time, the recording control unit 161 causes the continuous data region detection unit 160 to detect physically continuous free regions.
[0048]
Specifically, by the recording start operation, the transport stream assembling unit 104 divides the compressed video signal and the compressed audio signal into transport packets V_TSP and A_TSP in units of 188 bytes, respectively, and further performs a post-recording dummy. D_TSP generated by the packet generation unit 105 is added, a transport stream is created by arranging the three types of transport packets in order so as to form one VOBU, and then transferred to the recording unit 120 via the buffer memory 164.
[0049]
The recording unit 120 starts VOBU recording from the position of the logical block number designated by the recording control unit 161. At this time, in the recording unit 120, one VOBU is divided into units of 32 kbytes, and an error correction code is added to the unit of 32 kbytes and recorded on one logical block of the optical disc. When recording of one VOBU is completed in the middle of one logical block, recording of the next VOBU is continuously performed without opening a gap.
[0050]
The continuous data area detection unit 160 searches for the usage status of the logical block managed in the logical block management unit 144, and the unused logical block continues for 2.6 seconds in terms of maximum recording / reproduction rate. Detect the area. Then, the logical block number of the logical block area is notified to the recording unit 120 every time the writing of the logical block unit occurs, and the logical block management unit 144 is notified that the logical block is used.
[0051]
The logical block management unit 144 activates the playback unit 121 as necessary, reads the space bitmap of the UDF file system recorded on the optical disc 131, and grasps the usage status of the logical block. In the present embodiment, the space bitmap is collectively read when the power is turned on, so that the reading of the space bitmap is treated as an unnecessary process during post-recording mode recording, post-recording recording, and post-recording reproduction.
[0052]
Next, when performing post-recording recording (recording back audio), the functional blocks shown in FIG. 3 in the functional blocks of FIG. 1 are used. The post-recording recording control unit 162 reproduces video and audio by controlling the MPEG transport stream recorded on the optical disc 131 to pass through the pickup 130, the reproduction unit 121, and the transport stream decomposing unit 165. . At this time, the buffer memory 164 is divided into a moving image buffer memory and an audio buffer memory as shown in FIG. 7, and the buffer memory 164 is used for temporarily storing moving image and audio data recorded in advance. . At the same time, the post-recording recording control unit 162 compresses the audio of the audio signal input unit 102 into an AAC compression code via the audio compression unit 103 and further passes through the transport stream assembling unit 104 to generate an MPEG transcoding. Convert to port stream.
[0053]
The converted MPEG transport stream is further recorded as a back audio file on the phase change optical disk 131 via the buffer memory 164 (however, the audio buffer memory), the recording unit 120, and the pickup 130.
[0054]
As shown in FIG. 6, the back audio file is arranged in a physically continuous area of a fixed length (the moving image file has a fixed length and a different data size). A plurality of continuous data areas are secured, and the reverse audio transport stream is continuously arranged in the areas. Each fixed length region may be physically separated.
[0055]
Since the post-recording recording control unit 162 reproduces the video through the pickup 130 at time (1) in FIG. 8, the video data is accumulated at a speed of at least Vr−Vout in the video buffer memory. . On the other hand, the reverse audio transport stream is stored in the audio buffer memory at a speed equal to or lower than Ain. When the accumulated amount of the audio buffer memory exceeds 96 kbytes which is the data size of the audio continuous data area, the post-recording recording control unit 162 sets the pickup 130 for the back audio data to write back audio data. Move to an empty continuous data area (time (2)). During this movement, reading of the moving image from the disk is interrupted, so that the amount of data in the moving image buffer memory decreases at a maximum Vout rate. When the movement of the pickup 130 is completed, as shown in time (3), the code amount of the audio buffer memory decreases at the speed of Aw by writing the back audio data. Next, when the writing of one continuous data area of the back audio data is completed, the pickup 130 is returned to the reading interruption position of the moving image file (time (4)). Further, in the worst case, when a discontinuous portion of the continuous data area of the moving image file is encountered immediately after returning, the pickup 130 is moved to the next continuous data area, so that the moving image data on the moving image buffer memory is 0. (Time (5)). Then, when the reading of the moving image data in the next continuous data area is resumed, the moving image data is accumulated in the moving image buffer memory at the speed of the lowest Vr−Vout (time (6)). Thereafter, similarly, post-recording recording is realized while the pickup 130 is moved alternately.
[0056]
As described above, the video buffer memory is sure to keep the video data that can continue to be displayed during the time that the minimum size of the continuous data area of the video file is the sum of the pickup movement time for 3 times and the writing time of the audio data. Since it is the size that can be stored in the video, it can be played back in real time continuously without interruption. At the same time, even when an audio file is written, data can be continuously recorded without being lost.
[0057]
In the case of post-recording reproduction, the function block of FIG. 4 is used. The post-recording reproduction control unit 163 passes the moving image file recorded on the optical disc 131 via the pickup 130, the reproduction unit 121, the first transport stream decomposition unit 165, the video decompression unit 111, and the first audio decompression unit 113. Thus, it is reproduced as video and front audio. At the same time, the post-recording playback control unit 163 passes the back audio file recorded on the optical disc 131 via the pickup 130, the playback unit 121, the second transport stream decomposition unit 166, and the second audio expansion unit 114. , Play as back audio. At this time, as shown in FIG. 9, the buffer memory 164 is divided into a video buffer memory and an audio buffer memory, and the video buffer memory is used to store video file data, and the back audio file data is stored. Audio buffer memory is used to do this.
[0058]
The post-recording playback control unit 163 reads the back audio file for one continuous audio data area (96 kbytes) at time (1) in FIG. Thereby, the back audio data is accumulated in the audio buffer memory. Next, the pickup 130 starts moving from the back audio file to the moving image file (time (2)). When the pickup 130 arrives at the moving image file, reading and reproduction of the moving image data is started from the beginning of time (3). Therefore, data is accumulated in the moving image buffer memory at a speed of at least Vr-Vout. At the same time, reproduction of data in the audio buffer memory is started from the beginning of time (3). As a result, the amount of data in the audio buffer memory decreases at a maximum Aout rate. And this data amount is B _A-th At this point, the pickup 130 on the moving image file starts moving onto the audio file (time (4)). Due to this movement, reading of moving image data from the optical disk 131 is interrupted, so that the code amount of the moving image buffer memory decreases at the maximum Vout pace. When this movement is completed, data reading from the back audio file starts as in time (5), so that audio data is accumulated at a minimum Ar-Aout speed in the audio buffer memory. Then, at time (6), the post-recording reproduction control unit 163 moves the pickup 130 from the back audio file to the moving image file. FIG. 10 shows an example in which the movement of the pickup 130 occurs because the discontinuity point (boundary of the continuous data area) of the moving image file happens to be encountered at time (7) after the movement is completed. When this movement is completed, reading of moving image data is started again as shown in time (8). Thereafter, post-recording reproduction is realized in the same manner while the pickup 130 is moved alternately.
[0059]
T is the minimum read time length of the continuous data area for video during post-recording playback _V-CDA T is the time length for reading the continuous data area for audio during post-recording playback. _A-CDA Then, in FIG.
(Vr−Vout) t _V-CDA = Vout × (3t _seek + T _A-CDA ) ... (Formula 1)
(Ar-Aout) t _A-CDA = Aout × t _Aout ... (Formula 2)
t _Aout = T _V-CDA + 3t _seek ... (Formula 3)
T _V-CDA And t _A-CDA Is obtained as follows.
[0060]
t _V-CDA = (Vout / Vr) × (3t _seek + T _A-CDA )
/ (1- (Vout / Vr)) (Formula 4)
t _A-CDA = ((Aout / Ar) × 3t _seek )
/ (1- (Aout / Ar)-(Vout / Vr)) (Formula 5)
Also, the minimum data size S of the video continuous data area _V-CDA , And the minimum data size S of the continuous data area for back audio _A-CDA Is obtained as follows.
[0061]
S _V-CDA = Vr × t _V-CDA ... (Formula 6)
S _A-CDA = Ar × t _A-CDA ... (Formula 7)
In the case of this embodiment, t _seek = 0.5 s, Vout = 10 Mbps, Vr = 24 Mbps, Aout = 288 kbps, Ar = 24 Mbps _V-CDA = 1.1 s, S _V-CDA = 3.3 Mbytes, t _A-CDA = 0.03 s, S _A-CDA = 90 kbytes. So S _A-CDA Is 96 kbytes so as to be an integral multiple of the logical block.
[0062]
As described above, during the time (1.53 s) in which the continuous data area of the video file is the sum of the moving time of the pickup 130 and the reading time of the audio data (1.53 s), Since the size is such that motion is reliably stored in the buffer memory (3.3 Mbytes), video and front audio can be continuously reproduced in real time without being interrupted. At the same time, even when playing back audio files, real-time playback can be performed continuously without data loss.
[0063]
There is also an advantage that a plurality of back audio files can be created for one video, and the combination of the video file and the back audio file is selected to compare the video and the plurality of back audio.
[0064]
In addition, although the data size of the continuous data area for the back audio file is assumed to be a fixed length, it may be a variable length larger than the size of the fixed value. However, in this case, it is necessary to extend the minimum data size of the continuous data area of the moving image file by a length that allows for the maximum movement time of one pickup 130. That is, the data size of the continuous data area of the moving image file may be a length that allows for the movement time of the pickup 130 and the reading time of the audio data for four times. However, in this case, the data amount of the back audio file read by the pickup at a time is assumed to be a fixed value.
[0065]
In this embodiment, the data size of the continuous data area of the moving image file is greater than or equal to a predetermined size, but the data size of the continuous data area at the beginning and end of the moving image file is not limited to this. This is because, for example, when the head portion of a moving image file is deleted, the data size of the remaining continuous data area may be smaller than a predetermined data size. Even when the data size of the predetermined continuous data area is short, the continuous playback of one moving image file is not affected by increasing the number of data read in advance at the start of playback.
[0066]
Although FIG. 10 shows the case where the reading of the moving image file and the back audio file is completely synchronized, it is not necessary to completely synchronize. If the continuous data area of the moving image file and the back audio file is secured longer than the case of FIG. 10, the operation is as shown in FIG. The difference from FIG. 10 is that the section (3) is longer because the continuous data area of the moving image file and the back audio file is longer than that in FIG. In this case, the above (formula 3) is replaced by the following (formula 8).
[0067]
t _Aout ≧ t _V-CDA + 3t _seek ... (Formula 8)
Further, in this case, for example, by making the data size of the continuous data area of the back audio file to be in the range of 96 kbytes to 192 kbytes, it is very easy to edit the back audio file (see FIG. Shows the data structure of the file). This means that when editing specific parts of two back audio files by combining them into one back audio file, for example, the total data size of two continuous data areas in the combined part is 96 kbytes or less. In this case, a continuous data area of a minimum of 96 kbytes and a maximum of 192 kbytes can be obtained by simply combining two continuous data areas, or by combining three continuous data areas including the adjacent continuous data areas. It means that it can be created. This makes it possible to very easily achieve the combination of the back audio files by rewriting the data only at the combined portion. This is because if the fixed length is 96 kbytes, it is necessary to shift all data after the combined portion forward in the continuous data area. In this case, however, the amount of data read by the pickup at the time of post-recording recording and post-recording playback is one continuous data area. In addition, t in equation (1) _A-CDA Needs to be replaced with the reading time of the audio data of 192 kbytes (that is, the upper limit value). FIG. 33 is a diagram showing a data reading order and a read data amount when post-recording reproduction is performed. The reading amount of moving image data at one time may be more than the minimum continuous recording length for moving images. On the other hand, the amount of audio data read once may be equal to or greater than the minimum continuous recording length for audio and less than twice the minimum continuous recording length. FIG. 32 shows this time. The timing chart at the time of post-recording reproduction implementation is shown. T in FIG. _A-CDA Is t in FIG. _A-CDA The difference is that twice as much audio data is read.
[0068]
When the data read unit of the back audio file is assumed to be 1 to 2 times the data size of the minimum continuous data area, for example, from 96 kbytes to 192 kbytes, by replacing (Equation 2) with the following (Equation 9): The data size of the minimum continuous data area is obtained.
[0069]
(Ar-Aout) t _A-CDA = 2Aout × t _Aout ... (Formula 9)
Further, from the relationship of (Equation 1), (Equation 9), and (Equation 3),
t _A-CDA = (2 (Aout / Ar) × 3t _seek )
/ ((1- (Vout / Vr) × (1+ (Aout / Ar))) (Formula 10)
Is derived. Here, since Vr = Ar, the above (formula 10) is
t _A-CDA = (2 (Aout / Ar) × 3t _seek )
/ (1−Vout + Aout−Aout × Vout) (Formula 11)
To be simplified.
[0070]
At this time, since the data size of the continuous data area of the back audio file fluctuates within a predetermined range, the audio file is converted to UDF so that the post-recording reproduction control unit can easily detect the boundary of the back audio continuous data area. 1-bit information indicating that it is the head of the continuous data area for back audio may be added to the implementation use field. At this time, the short allocation descriptor is not used because there is no implementation use field, and information indicating the boundary cannot be arranged. As another method, in the extended attribute field of the file entry, information indicating whether or not it is the head of the continuous data area may be provided for each allocation descriptor. Here, the case where a certain allocation descriptor is not the head of the continuous data area is a case where two allocation descriptors are used as a result of skipping a defective logical block.
[0071]
As another method, the data size of the continuous data area for back audio may be recorded in a dedicated file different from the back audio file during post-recording recording. At this time, the data size of each back audio continuous data area is recorded, for example, in a separate dedicated file for each back audio file. Then, at the time of post-recording reproduction, the data size information of the back audio continuous data area recorded separately is referred to, and the data size is read at a time.
[0072]
In the first embodiment, the boundary of the continuous data area for back audio and the boundary of each audio frame included in A_TSP are not particularly mentioned, but they may be matched.
[0073]
In the first embodiment, a single seek operation between continuous data areas on the moving image file side is considered, but conversely, the continuous data area on the back audio file side has a data size greater than or equal to a predetermined value, The continuous data area on the file side may have a data size within a predetermined range, and one seek operation between the continuous data areas on the back audio side may be considered.
[0074]
In the first embodiment, the data size of the continuous data area is calculated based on the peak rates Vr and Ar. However, for example, when the actual bit rate of the video stream fluctuates below the peak rate, the data in the continuous data area Even if the size does not satisfy the value of Equation (6), it is sufficient if it includes moving image data having a playback time equal to the playback time at the peak rate. The same applies to an audio stream. For example, Vout = 10 Mbps, S _V-CDA Even when recording is started on the premise of = 3.3 Mbytes, if the actual bit rate generated by the transport stream assembling unit 104 happens to be 5 Mbps or less, the data size of the video continuous data area is 1.65 Mbytes. It may be. This is because the data for the same playback time is read.
[0075]
In the first embodiment, the case of post-recording recording and post-recording playback has been dealt with. However, when performing video file recording and video file recording at a low bit rate of, for example, 1 Mbps or less simultaneously, The concept of continuous data area length similar to the above may be introduced. In this case, for example, it is assumed that a moving image file compressed by MPEG4 of 160 × 120 pixels is recorded while a moving image file compressed by MPEG2 of 740 × 480 pixels is recorded by a camcorder. However, in this case, a moving image file of 740 × 480 pixels is a target to be recorded, not reproduced.
[0076]
In the first embodiment, a case where one moving image file and one back audio file are recorded / played back simultaneously is shown. However, a plurality of back sound files are recorded while playing back a single video file. In addition, a similar concept can be applied to a case where a plurality of back audio files are reproduced while reproducing one moving image file. For example, when N back audio files are assumed, the minimum value of the data size of the continuous recording area of the moving image file may be multiplied by N compared to the case of one back audio file. The maximum value and minimum value of the continuous data area of the back audio file may be multiplied by N times.
[0077]
In the first embodiment, during post-recording reproduction, the data in the audio buffer is changed to the threshold value B in FIG. _A-th In the following case, the pickup is moved to the back audio file side. However, one continuous data area of the back audio file may be read at a predetermined time period and schedule. Then, during the period when the back audio file is not read, the moving image file is read as needed.
[0078]
In the first embodiment, during post-recording reproduction, the data in the audio buffer is changed to the threshold value B in FIG. _A-th The pickup is moved to the back audio file side when the following occurs, but the moving image file and the back audio file may be read with a predetermined time period and schedule.
[0079]
In the first embodiment, at the time of post-recording recording, the data in the audio buffer is changed to the threshold value B in FIG. _A-th When the above is reached, the pickup is moved to the back audio file side. However, the back audio file may be written to one continuous data area at a predetermined time period and schedule. Then, during the period when the back audio file is not read, the moving image file is read as needed.
[0080]
In the first embodiment, at the time of post-recording recording, the data in the audio buffer is changed to the threshold value B in FIG. _A-th When the above is reached, the pickup is moved to the back audio file side, but the back audio file is written to one continuous data area and the data is read from the video file at a predetermined time period and schedule. May be.
[0081]
In the first embodiment, the case where the data size of the continuous data area of the back audio file is a variable length greater than or equal to a predetermined value has been shown. However, in order to simplify the rules for the data size of the continuous data area, It may be the same as the rule of the continuous data area of the file. However, even in this case, the data size of the back audio file to be read at a time is read by a fixed length.
[0082]
In the first embodiment, the case where the data size of the continuous data area of the back audio file is a variable length greater than or equal to a predetermined value has been described. However, in order to simplify the rules for the data size of the continuous data area, It may be completely continuous. However, in this case, after the recording of the back audio file is completed, it is necessary to move all data for continuation. Even in this case, the data size of the back audio file to be read at a time is read by a fixed length.
[0083]
In the first embodiment, the physical arrangement between the moving image file and the back audio file is not particularly mentioned. However, when recording in the post-recording mode, as shown in FIG. Video files may be recorded so that data can be arranged alternately. During post-recording recording, the data of the back audio file is written in an area reserved in advance. As a result, the amount of seek generated during post-recording playback can be significantly reduced. This is because, if the back audio continuous data area and the moving image file continuous data area shown in FIG. 26 are sequentially read, the two seek operations required every time the back audio data is read out become unnecessary.
[0084]
Further, as shown in FIG. 31, the physical arrangement of the continuous data area of the back audio file may be arranged immediately before the VOBU of the moving image file. At this time, the back audio data corresponding to the VOBU physically disposed immediately after is stored in one back audio continuous data area. Thus, random access in units of VOBU can be easily performed during post-recording reproduction. At this time, during the post-recording reproduction, the continuous reading amount of the moving image file necessary for seamlessly reading out the data is only 1/3 compared with the case of the first embodiment. If post-recording recording to the continuous data area of the back audio file cannot be performed in real time due to the transfer rate of the optical disk drive or the maximum seek time, the back audio data may be recorded offline. In this case, it is impossible to inject sound while confirming the reproduction data, but it can be utilized when writing BGM (background music). In FIG. 31, the continuous data area of the back audio file is composed of 3 ECC blocks, but this is 2 for audio data for 1 second (64 kbytes), when a defective block occurs. Of spare ECC blocks (32 kbytes). In addition to this, a fourth ECC block may be added to record still image data or the like to be superimposed on the moving image file.
[0085]
Furthermore, the back audio data in FIG. 31 may have an audio frame having the same presentation time stamp as the back audio dummy data in the moving image data. This makes it easier to copy the audio data of the back audio file into the moving image file. Also, the internal data structure in the packet may have a data structure similar to the back audio data in the moving image file. This is the same when the moving image file is recorded in the program stream format instead of the transport stream.
[0086]
(Embodiment 2)
Next, a second embodiment of the present invention will be described. The difference between the second embodiment and the first embodiment is that the back speech encoding method is different. In the first embodiment, an AAC compression code is used, whereas in the second embodiment, a linear PCM (Linear PCM or Pulse Code Modulation) code is used.
[0087]
FIG. 11 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to Embodiment 2 of the present invention. The difference between FIG. 1 and FIG. 11 is that an A / D converter 174 and a second transport stream assembly unit 175 are included, and a first transport stream assembly unit 173 is provided instead of the transport stream assembly unit 104 ( However, the post-recording recording control unit 170 and the post-recording reproduction control unit 171 are functionally different from each other in that the D / A conversion unit 176 is provided instead of the second audio decompression unit 114. , And a buffer memory 172. Note that the data reading speed of the reproducing unit 121, the maximum recording / reproducing rate of the transport stream decomposing units 165 and 166, and the maximum movement time during the reading operation and writing operation of the pickup 130 are the same as those in the conventional example.
[0088]
FIG. 12 shows blocks related to post-recording recording in FIG. 11, and FIG. 13 shows blocks related to post-recording reproduction in FIG.
[0089]
As described above, since the linear PCM code is used as the code format of the back audio, the second audio expansion unit 114 having a large circuit scale can be replaced with the D / A conversion unit 176 having a small circuit scale during post-recording reproduction.
[0090]
However, since the playback speed of the back audio is higher than in the case of AAC compression, it is necessary to adjust the length of the continuous data area based on (Equation 7) accordingly.
[0091]
Note that the data size of the continuous data area for the back audio file is a fixed length, but it may be a variable length greater than the fixed size. However, in this case, it is necessary to extend the minimum data size of the continuous data area of the moving image file by a length that allows for the maximum movement time of one pickup 130.
[0092]
The data size of the continuous data area of the back audio file may be within a predetermined range (for example, 96 kbytes to 192 kbytes). This is because editing processing such as joining of back audio files becomes very easy.
[0093]
(Embodiment 3)
Next, a third embodiment of the present invention will be described. The difference between the third embodiment and the first embodiment is that, at the time of post-recording playback, the video file and the back audio file are not played back simultaneously, but the back audio file is preliminarily included in the video file as one transport stream. Mixing (MIX) is performed, and at the time of reproduction, the front audio stream and the back audio stream are decoded in parallel.
[0094]
FIG. 14 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to Embodiment 3 of the present invention. The difference between FIG. 1 and FIG. 14 is that it has only one transport stream decomposing unit 115 and a post recording MIX control unit 180. Further, the post-recording playback control unit 153 is different in that it has the same function as the conventional post-recording playback control unit 153. Note that the data reading speed of the reproducing unit 121, the maximum recording / reproducing speed of the transport stream decomposing unit 115, and the maximum movement time during the reading operation and writing operation of the pickup 130 are the same as those in the conventional example.
[0095]
FIG. 15 is a diagram showing blocks related to post-recording reproduction in FIG.
[0096]
During video recording and post-recording recording, the same processing as in the first embodiment is performed. Thereafter, the D_TSP in the moving image file is replaced with the A_TSP in the back audio file, thereby rewriting the transport stream in which the front audio stream and the back audio stream are mixed.
[0097]
At the time of post-recording reproduction, the moving image file after MIX is passed through the reproduction unit 121, buffer memory 164, and transport stream decomposition unit 115 in FIG. Further, the front audio stream passes through the first audio expansion unit 113 and the audio output unit 112, and the back audio stream passes through the second audio expansion unit 114 and the audio output unit 112, and both audios are combined with the video. Reproduce.
[0098]
As described above, by creating a moving image file composed of a transport stream in which front audio and back audio are mixed, it is not necessary to manage two files, and only one file needs to be managed.
[0099]
Further, since the data structure of the moving image file and the back audio file is the same transport stream format, it is only necessary to exchange D_TSP in the moving image file and A_TSP in the back audio file, so that it is easy to create a MIXed moving image file. . In addition, because the data structure of the video file and the back audio file is the same transport stream format, it is also replaced when a transport stream in which D_TSP in the video file is replaced with A_TSP in the back audio file is output to the digital interface. Becomes easier. Furthermore, by making the data structure of the back audio file into an MPEG system stream format such as a transport stream, even if the audio compression code (for example, AAC code) is different, it can be handled as a unified audio file. Easy to handle back audio files.
[0100]
The data size of the continuous data area of the back audio file may be within a predetermined range (for example, 96 kbytes to 192 kbytes). This is because editing processing such as joining of back audio files becomes very easy.
[0101]
Although only the data size of the continuous data area for the back audio file has a fixed length, the data size of the continuous data area on the moving image file side may be another fixed value. However, in this case, it is necessary to reduce the minimum data size of the continuous data area of the moving image file by a length that allows for the maximum movement time for one pickup 130. That is, the data size of the continuous data area of the moving image file may be set to a length that allows for the movement time of the pickup 130 and the reading time of the audio data for two times. However, in this case, it is assumed that the data amount of the moving image file read out by the pickup at the time of post-recording playback is one continuous data area. In addition, it is assumed that the data amount of the back audio file read by the pickup during post-recording playback is also one continuous data area.
[0102]
At this time, the data size of the continuous data area of the back audio file may not be a fixed length, but may be a data size that falls between the minimum value and the maximum value.
[0103]
(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. The difference between the fourth embodiment and the first embodiment is that it handles post-recording reproduction of a moving image file that does not include audio data in the moving image file and includes only still images. An example will be described in which such still images are switched in a designated order at a predetermined time interval like a slide show while simultaneously playing back audio recorded in an audio file. The configuration of the audio / video information recording / reproducing apparatus is the same as that of the first embodiment.
[0104]
FIG. 23 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 4 of the present invention. Hereinafter, a description will be given with reference to FIG.
[0105]
The post-recording reproduction control unit 163 starts reading moving image data from the beginning of time (1). Therefore, data is accumulated in the moving image buffer memory at a speed of Vr. Next, at time (2), a seek operation is performed on the audio data. Then, after the reading of still image data for one sheet is completed, the still image is displayed from time (3). At the same time, reading of data in the audio buffer memory and reproduction of the read data are started. As a result, the amount of data in the audio buffer memory increases at a maximum Ar-Aout rate. At time (4), the pickup 130 moves from the audio data to the video data. During this time, audio output is also performed at the same time, so the amount of code in the audio buffer memory decreases at the speed of Aout. When the movement of the pickup 130 is completed, reading of the video data is resumed (time (5)). The amount of data in the audio buffer memory is B _A-th At this point, the pickup 130 on the moving image file starts moving again onto the audio file (time (6)). By repeating the above, the display cycle t _still In the meantime, the read still image data is transferred to the transport stream decomposing unit 165, and the video decompressing unit 111 reproduces the video. Also, the display cycle t _still During this time, the read audio data is also reproduced by the first audio decompression unit 113.
[0106]
Here, the video update interval t which is the display cycle _still l is the time t for reading one still image data. _Vread , The time to read the audio data recorded in the continuous data area of fixed data size t _A-CDA , The maximum travel time of the pickup 130 is t _seek If so, the following (Formula 12) may be satisfied.
[0107]
t _still ≧ t _Vread + T _A-CDA + 2t _seek ... (Formula 12)
As described above, it is possible to easily add sound to the slide show.
[0108]
In the fourth embodiment, the still image is included in the moving image file composed of the transport stream, but may be a JPEG file. In this case, needless to say, a JPEG decoding unit is required.
[0109]
Further, in the fourth embodiment, the update interval of the still images is assumed to be constant, but may be specified individually for each sheet as long as the above (Equation 12) is satisfied. If the data size of the still image is individually different, the update interval may be specified for each image within a range that satisfies (Equation 9) according to the data size.
[0110]
In the fourth embodiment, the case where the sound is reproduced while the still image is slide-displayed is shown, but the same applies to the case where the sound is recorded. In this case, needless to say, the reading time and writing time of the audio data may be changed.
[0111]
The data size of the continuous data area of the back audio file may be within a predetermined range (for example, 96 kbytes to 192 kbytes). This is because editing processing such as joining of back audio files becomes very easy. However, in this case, t in (Equation 12) _A-CDA As described above, it is necessary to replace with the reading time of the maximum value of the data size (192 kbytes).
[0112]
Further, in the fourth embodiment, it is assumed that no seek occurs at the time of reading an audio file once, but multiple seeks may be assumed. However, in this case, it is necessary to extend the reproduction time of the still image by the seek time.
[0113]
(Embodiment 5)
Differences between the fifth embodiment and the first embodiment of the present invention will be described below.
[0114]
First, the minimum value of the continuous data area for moving images is different. The minimum value is the video between reading the data size of the continuous data area required to secure the video data for the maximum movement time of two pickups and the data size of twice the minimum value of the continuous data area of the back audio It is the sum of the data size in the continuous data area required to secure the data.
[0115]
Second, the minimum value of the continuous data area for back audio is different. This minimum value is between the data size of the continuous data area required to secure the back audio data for the maximum movement time of two pickups and the data for twice the minimum value of the continuous data area of the video. It is the total of the data size on the continuous data area required to secure the moving image data to be reproduced.
[0116]
Thirdly, the minimum value and the maximum value of the reading amount of moving image data at one time are determined.
[0117]
Fourthly, another minimum value and maximum value are determined for the amount of reading of the back audio data once.
[0118]
FIG. 27 is a diagram illustrating a pickup moving path during post-recording reproduction according to the fifth embodiment. In FIG. 27, the moving image data or the back audio file is read in the order of the reading number (number following #).
[0119]
FIG. 28 shows the data structure of the back audio file according to the fifth embodiment. In FIG. 28, A_TSP forms a continuous data area. Further, a specific data range on the continuous data area is set as one reading range.
[0120]
FIG. 29 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus in the fifth embodiment.
[0121]
FIG. 30 is a diagram illustrating an example of the read data size of one continuous data area. For example, the case where reading is performed with the minimum value twice from the beginning, and the data size of 1.5 times the minimum value is read next (FIG. 30A). The last one data size is long because the fixed read amount (S _V-CDA This is because the last four times are smaller than the minimum value. In order to secure a fixed read amount, it is necessary to read the head data of the next continuous data area # (m + 1) (FIG. 30B). At this time, since a seek operation occurs, the video is interrupted during post-recording playback.
[0122]
FIG. 34 is a diagram showing a data reading order and a read data amount when post-recording reproduction is performed. The reading amount of moving image data at one time may be not less than the minimum continuous recording length for moving images and less than twice the minimum continuous recording length. Similarly, the amount of audio data read once may be equal to or greater than the minimum continuous recording length for audio and less than twice the minimum continuous recording length.
[0123]
FIG. 36 is a conceptual diagram of a continuous data area. The minimum moving image continuous data area includes video data corresponding to the total time of the time required to read the minimum double audio continuous data area and the maximum seek time for two times. On the other hand, the minimum audio continuous data area includes audio data corresponding to the total time of the time required to read the minimum double video continuous data area and the maximum seek time for two times.
[0124]
FIG. 40 is a diagram showing scheduling information that can be referred to during post-recording playback.
[0125]
In FIG. 29, the minimum value (S _V-CDA ) And the minimum value of the continuous data area for voice (S _A-CDA )
(Vr−Vout) t _V-CDA = 2Vout × (2t _seek + T _A-CDA ) ... (Formula 13)
(Ar-Aout) t _A-CDA = 2Aout × t _Aout ... (Formula 14)
t _Aout = T _V-CDA + 2t _seek ... (Formula 15)
From the relational expression, t _A-CDA Is represented by the following (formula 16).
[0126]
t _A-CDA = (4t _seek × Aout (Vr + Vout))
/ ((Vr−Vout) (Ar−Aout) −4Aout × Vout) (Expression 16)
Also,
S _V-CDA = Vr × t _V-CDA / 2 ... (Formula 17)
S _A-CDA = Ar × t _A-CDA / 2 ... (Formula 18)
It becomes. Here, the data size of the video continuous data area is S _V-CDA It is assumed that the above values are arbitrary. The data size of the continuous data area for back audio is S _A-CDA It is set as the above arbitrary values.
[0127]
During post-recording playback, back audio files and video files are read alternately. At this time, the minimum value to be read at a time is at least S if it is a back audio file. _A-CDA Minutes, twice at maximum. If it is a video file, the minimum is S _V-CDA Minutes, twice at maximum.
[0128]
With the above configuration, the minimum value (S of the data size of the continuous data area for realizing post-recording recording and post-recording reproduction) _V-CDA ) Can be reduced to 2/3 compared to the first embodiment. Thereby, even if the order is determined by a playlist such as SMIL, the time interval from the IN point to the OUT point can be reduced.
[0129]
In the fifth embodiment, the data size of the continuous data area of the moving image file is greater than or equal to a predetermined size, but the data size of the continuous data area at the beginning and end of the moving image file is not limited to this. This is because, for example, when the head portion of a moving image file is deleted, the data size of the remaining continuous data area may be smaller than a predetermined data size. Even when the data size of the predetermined continuous data area is short, the continuous playback of one moving image file is not affected by increasing the number of data read in advance at the start of playback.
[0130]
In the fifth embodiment, an example of how to read data is shown in FIG. 30. However, the reading is such that the audio data is read immediately before the audio data is insufficient while the code amount of the video buffer is filled as soon as possible. May be better. However, even in this case, the same reading method as in FIG. 30 is performed on the audio data.
[0131]
It should be noted that the reading method as shown in FIG. 30 is not performed at the time of post-recording reproduction as in the fifth embodiment, but the data size is equalized in each of the three readings as shown in FIG. You may read out. This method requires a smaller amount of buffer memory during post-recording playback. Furthermore, the read data size that is as uniform as possible every time during post-recording and the address information of the top data of the data size may be recorded on the disc. FIG. 40 shows an example of such scheduling information for post-recording reproduction recorded on the disc. This scheduling information includes an amount that is continuously read out once for each of the back audio data and the moving image data. In the example of FIG. 40, the back audio data has a fixed data size S. _A-CDA Read each time, moving image data is S _V-CDA The data is read in increments of 1.17 times. That is, the read data size when the moving image data and the back audio data are alternately read to realize seamless post-recording reproduction is held. In FIG. 40, the address of the reading start point of the moving image file or the back audio file is also recorded. At this address, an offset value from the beginning of the file is recorded. Information relating to such data reading scheduling is recorded in association with each file (for example, a playlist) instructing the content of post-recording reproduction. Thereby, the usage rate of the video buffer can be easily reduced. This increases the chances of using the video buffer for data storage applications for vibration absorption, thus improving earthquake resistance. Further, it is not necessary to calculate the amount of read data every time post-recording reproduction is performed. Alternatively, it is not necessary to adjust the data read timing by monitoring the remaining amount of the video buffer or audio buffer every time the post-recording reproduction is performed. The recording / reproducing apparatus may record such scheduling information after the back audio data by post-recording recording is completed, or may be created during recording.
[0132]
(Embodiment 6)
The sixth embodiment of the present invention differs from the first embodiment in that two seek operations are assumed.
[0133]
FIG. 35 shows the reading order and reading data size of moving image data and audio data. The read data amount of the audio data is always a predetermined value (minimum length of the continuous data area).
[0134]
FIG. 38 shows the readout timing of moving image data and audio data.
[0135]
Also, the following (Expression 19) to (Expression 24) are relational expressions related to the present embodiment.
[0136]
(Vr−Vout) t _V-CDA = Vout × (2t _seek + T _A-CDA (Equation 19)
(Ar-Aout) t _A-CDA = Aout × t _Aout ... (Formula 20)
t _Aout = T _V-CDA + 2t _seek ... (Formula 21)
S _V-CDA = Vr × t _V-CDA ... (Formula 22)
S _A-CDA = Ar × t _A-CDA ... (Formula 23)
t _A-CDA = (2t _seek × Aout) / (Vr−Vout−Aout) (Equation 24)
With the above configuration, post-recording recording / playback can be performed. The feature of this embodiment is that the data size of the continuous data area of the moving image file can be smaller than those in the first and fifth embodiments. Instead, after recording the moving image file and the back audio file, if the middle portion of the moving image file is deleted for editing, the video is likely to freeze during post-recording playback. Or, audio data is missing.
[0137]
In each embodiment, the storage medium is a phase change optical disk. However, the present invention is not limited to this. For example, a DVD-RAM, an MO, a DVD-R, a DVD-RW, a DVD + RW, a CD-R. Any recording medium having a disk shape such as an optical disk such as a CD-RW or a hard disk may be used. Further, it may be a semiconductor memory such as a flash memory.
[0138]
Similarly, in each embodiment, the read / write head is a pickup, but in the case of MO, it is a pickup and a magnetic head, and in the case of a hard disk, it is a magnetic head.
[0139]
In each embodiment, the transport stream may be combined in a format compliant with the digital broadcasting standard using MPEG. For example, a transport stream compliant with the Japanese BS digital broadcasting standard, a transport stream compliant with the US ATSC standard, and a transport stream compliant with the European DVB standard may be used.
[0140]
In each embodiment, the moving image file and the audio file are transport streams, but may be a bit stream including other multimedia information such as a program stream and a PES stream.
[0141]
In each embodiment, only the audio file is read at the time of post-recording reproduction. However, a still image file may be read in addition to the audio file. At this time, audio files and still image files may be collected as much as possible and recorded, and immediately after a seek operation, they may be physically and alternately recorded so that a part of the audio file and a part of the necessary still image file can be read together each time. .
[0142]
In each embodiment, the logical block is 32 kbytes and the sector is 2 kbytes. However, if the logical block size is an integral multiple of the sector size, for example, the logical block may be 16 kbytes and the sector may be 2 kbytes. Further, both the logical block and the sector may be 2 kbytes.
[0143]
In each embodiment, the video compression code and the audio compression code are MPEG2 video compression code and AAC compression code, respectively. However, MPEG1 video compression code or MPEG4 video compression code, MPEG-Audio compression code, A Dolby AC3 compression code, a Twin-VQ compression code, or the like may be used.
[0144]
In each embodiment, the moving image file and the back audio file are recorded on the same optical disc, but may be recorded on different recording media. For example, a moving image file may be recorded on an optical disk, a back audio file may be recorded on a flash memory card, and a composite file may be recorded on an optical disk. In this case, since the movement opportunity of the pickup is reduced, post-recording recording and post-recording reproduction can be realized extremely easily.
[0145]
In each embodiment, the file is managed by the UDF file system. However, the file may be managed by a FAT (File Allocation Table) or other unique file system.
[0146]
In each embodiment, the third file may be recorded as a file that associates the moving image file and the back audio file in addition to the moving image file and the back sound file. The third file may be described in SMIL (Synchronized Multimedia Integration Language) language, which is being standardized by W3C, and describes the simultaneous playback (parallel playback) timing of the moving image file and the back audio file. As a result, the relationship between the moving image file and the back audio file can be clearly described in terms of reproduction timing and the like. For example, by specifying the elapsed time from the beginning of the video file and the elapsed time from the beginning of the audio file, it is possible to specify the start point of simultaneous playback. Further, by using the SMIL language, even if the moving image file, the back audio file, and the third file are moved to the personal computer, they can be reproduced by the SMIL player of the application software on the personal computer.
[0147]
In each embodiment, when recording a back audio file by performing post-recording recording on a part of the moving image file, the time information of the post-recording recording start timing is set in the back audio file, in the third file, Or it is necessary to record in another 4th file.
[0148]
Also, in each embodiment, the back audio for the video is recorded in the back audio file, but music (BGM, etc.) whose timing is not directly related to the video is recorded, and is the same as the post-recording playback. It may be played back by the method.
[0149]
In each embodiment, the maximum movement time of the pickup is the same at the time of reading and at the time of writing, but may be different. However, in this case, it is necessary to select an appropriate or larger one as the maximum moving time of the pickup, and obtain the data size of the continuous data area (Equation 6 and Equation 7) and the video update time (Equation 9).
[0150]
【The invention's effect】
As described above, according to the present invention, there is provided an audio / video information recording / reproducing apparatus that can easily realize a post-recording function on an optical disc and at the same time easily edit audio files such as combining and dividing. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram related to post-recording mode recording of the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 3 is a block diagram related to post-recording recording of the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 4 is a block diagram related to post-recording playback of the audio / video information recording / playback apparatus according to Embodiment 1 of the present invention;
FIG. 5 is a diagram showing a recording format of a moving image file during post-recording mode recording in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 6 is a diagram showing a recording form of a back audio file at the time of post-recording recording in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention.
FIG. 7 is a diagram showing an operation model during post-recording recording of the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 8 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory at the time of post-recording recording in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 9 is a diagram showing an operation model at the time of post-recording reproduction of the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 10 is a diagram showing transitions of code amounts in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 11 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to Embodiment 2 of the present invention.
FIG. 12 is a diagram showing blocks related to post-recording recording in the audio / video information recording / reproducing apparatus according to Embodiment 2 of the present invention;
FIG. 13 is a diagram showing blocks related to post-recording reproduction of the audio / video information recording / reproducing apparatus according to Embodiment 2 of the present invention.
FIG. 14 is a block diagram showing a functional configuration of an audio / video information recording / reproducing apparatus according to Embodiment 3 of the present invention.
FIG. 15 is a diagram showing blocks related to post-recording reproduction of the audio / video information recording / reproducing apparatus according to Embodiment 3 of the present invention;
FIG. 16 is a block diagram showing a functional configuration of a conventional audio / video information recording / reproducing apparatus.
FIG. 17 is a diagram showing a recording format of a moving image file during post-recording mode recording in a conventional audio / video information recording / reproducing apparatus.
FIG. 18 is a structural diagram of a transport stream of a moving image file during post-recording mode recording in a conventional audio / video information recording / reproducing apparatus.
FIG. 19 is a diagram showing a state in which a moving image file is managed by the UDF file system.
FIG. 20 is a diagram showing a data structure of an allocation descriptor of a UDF file system
FIG. 21 is a diagram showing an operation model at the time of file playback in a conventional audio / video information recording / playback apparatus;
FIG. 22 is a diagram showing a code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the conventional audio / video information recording / reproducing apparatus.
FIG. 23 is a diagram showing code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 4 of the present invention;
FIG. 24 shows moving image buffer memory and codes in the audio buffer memory at the time of post-recording reproduction in the audio / video information recording / reproducing apparatus when the moving image continuous data area is secured longer according to Embodiment 1 of the present invention. Diagram showing quantity transition
FIG. 25 is a data structure diagram showing a modified example of the transport stream of the back audio file in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 26 is a diagram showing a relationship between continuous data areas of a video file and a back audio file in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 27 is a diagram showing a pickup moving path during post-recording reproduction according to Embodiment 5 of the present invention;
FIG. 28 is a diagram showing a data structure of a back audio file according to the fifth embodiment of the present invention.
FIG. 29 is a diagram showing transition of code amounts in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 5 of the present invention.
FIG. 30 is a diagram showing an example of the read data size of one continuous data area
FIG. 31 is a diagram showing a physical arrangement in a continuous data area of a video file and a back audio file in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 32 is a diagram showing code amount transition in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention;
FIG. 33 is a diagram showing another data reading timing at the time of post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention.
FIG. 34 is a diagram showing data read timing at the time of post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 5 of the present invention.
FIG. 35 is a diagram showing data read timing at the time of post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 6 of the present invention.
FIG. 36 is a diagram showing the data size of a continuous data area in which post-recording reproduction is possible in the audio / video information recording / reproducing apparatus according to Embodiment 5 of the present invention.
FIG. 37 is a diagram showing the data size of a continuous data area in which post-recording reproduction is possible in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention.
FIG. 38 is a diagram showing another transition of the code amount in the moving image buffer memory and the audio buffer memory during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 1 of the present invention.
FIG. 39 is a diagram showing an example of read data size of one continuous data area during post-recording reproduction in the audio / video information recording / reproducing apparatus according to Embodiment 5 of the present invention;
FIG. 40 is a diagram showing scheduling information that can be referred to during post-recording playback in a modification of the fifth embodiment of the present invention.
[Explanation of symbols]
100 Video signal input section
101 Video compression unit
102 Audio signal input unit
103 Voice compression unit
104 Transport Stream Assembly Department
105 Dummy packet generator for post-recording
110 Video display section
111 Video expansion unit
112 Audio output unit
113 1st audio expansion part
114 Second audio decompression unit
165 First transport stream decomposition unit
166 Second transport stream decomposition unit
120 Recording unit
121 Playback unit
130 Pickup
131 Phase change optical disk
140 Playback control unit
141 Logic Block Supervision Department
160 Continuous data area detector
161 Recording control unit
162 Recording control unit for post-recording
163 Post-recording playback controller
164 Buffer memory
180 Post-recording MIX controller

Claims (38)

A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
An audio / video information recording / reproducing apparatus comprising a simultaneous recording / reproducing unit for continuously recording / reproducing the first audio / video information and recording / reproducing the second audio / video information simultaneously. ,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is three times the maximum interruption time of reading and writing, and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least three times as long as the maximum interruption time of reading and writing, a writing time to the first audio / video continuous data area of the first size, or the first audio / video use time. The data size is such that the second audio / video information can be continuously read until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. An audio / video information recording / reproducing apparatus.   2. The audio / video information recording / reproducing apparatus according to claim 1, wherein a data size of the second continuous audio / video data area is not more than twice the second size.   2. The audio / video information recording / reproducing apparatus according to claim 1, wherein the maximum interruption time is a maximum movement time of the read / write head.   The simultaneous recording / reproducing unit continuously records or reproduces the second audio / video information within a range of the second size and a data size twice as large as the second size. Item 2. The audio / video information recording / reproducing apparatus according to Item 1. The simultaneous recording / reproducing unit continuously records or reproduces the first audio / video information of the first size by the first recording / reproducing unit;
Continuous recording or reproduction of the second audio / video information within a range of the second size and a data size twice the second size by the second recording / reproducing unit;
2. The audio / video information recording / reproducing apparatus according to claim 1, wherein the recording is performed alternately. A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
An audio / video information recording / reproducing apparatus comprising a simultaneous recording / reproducing unit for continuously recording / reproducing the first audio / video information and recording / reproducing the second audio / video information simultaneously. ,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or Until the first audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the second size is secured, The data size allows continuous reading of the first audio / video information,
The second size is at least a time that is twice as long as the maximum interruption time of reading and writing and a time for writing to the first audio / video continuous data area having a data size that is twice the first size, or Until the second audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the first size is secured, An audio / video information recording / reproducing apparatus having a data size capable of continuously reading the second audio / video information.   7. The audio / video information recording / reproducing apparatus according to claim 6, wherein the interruption time is a movement time of the read / write head.   7. The audio / video information recording / reproducing apparatus according to claim 6, wherein the recording medium is a disk, and the moving time includes a rotation waiting time of the disk. The data size of the first audio / video continuous data area is not more than twice the first size,
7. The audio / video information recording / reproducing apparatus according to claim 6, wherein a data size of the second continuous audio / video data area is not more than twice the second size. The simultaneous recording / reproducing unit continuously records the first audio / video information within the range of the first size and a data size that is twice the first size by the first recording / reproducing unit. Play and
Continuous recording or reproduction of the second audio / video information within a range of the second size and a data size twice the second size by the second recording / reproducing unit;
10. The audio / video information recording / reproducing apparatus according to claim 9, wherein the recording is performed alternately. Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information;
An audio / video information recording / reproducing method comprising the step of recording or reproducing the first audio / video information and the step of simultaneously recording or reproducing the second audio / video information simultaneously,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is three times the maximum interruption time of reading and writing, and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least three times as long as the maximum interruption time of reading and writing, a writing time to the first audio / video continuous data area of the first size, or the first audio / video use time. The data size is such that the second audio / video information can be continuously read until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. Audio / video information recording / playback method. 12. The audio / video information recording / reproducing method according to claim 11 , wherein a data size of the second continuous audio / video data area is not more than twice the second size. 12. The audio / video information recording / reproducing method according to claim 11, wherein the maximum interruption time is a maximum movement time of the read / write head. The simultaneous recording and reproduction unit, wherein, characterized in that the recording or reproducing continuously the second audio / video information in the range of 2 times the data size of the second size and the second size Item 12. The audio / video information recording / reproducing method according to Item 11 . The first audio / video information is continuously recorded or reproduced in the first size,
12. The audio according to claim 11 , wherein the second audio / video information is continuously recorded or reproduced within a range of the second size and a data size twice as large as the second size. / Video information recording and playback method. Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information;
An audio / video information recording / reproducing method comprising the step of recording or reproducing the first audio / video information and the step of simultaneously recording or reproducing the second audio / video information simultaneously,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or Until the first audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the second size is secured, The data size allows continuous reading of the first audio / video information,
The second size is at least a time that is twice as long as the maximum interruption time of reading and writing and a time for writing to the first audio / video continuous data area having a data size that is twice the first size, or Until the second audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the first size is secured, An audio / video information recording / reproducing method, characterized in that the data size is such that the second audio / video information can be continuously read. 17. The audio / video information recording / reproducing method according to claim 16, wherein the interruption time is a movement time of the read / write head. 17. The audio / video information recording / reproducing method according to claim 16 , wherein the recording medium is a disc, and the moving time includes a rotation waiting time of the disc. The data size of the first audio / video continuous data area is not more than twice the first size,
17. The audio / video information recording / reproducing method according to claim 16 , wherein a data size of the second audio / video continuous data area is further not more than twice the second size. In the step of simultaneously and continuously recording or reproducing the first audio / video information and recording or reproducing the second audio / video information,
Continuous recording or reproduction of the first audio / video information within a range of the first size and a data size twice as large as the first size;
Continuous recording or reproduction of the second audio / video information within a range of the second size and a data size twice as large as the second size;
17. The audio / video information recording / reproducing method according to claim 16, wherein the method is performed alternately. A first recording / reproducing unit for recording or reproducing the first audio / video information; a second recording / reproducing unit for recording or reproducing the second audio / video information; and recording of the first audio / video information. Or a recording medium on which information is recorded using an audio / video information recording / reproducing apparatus having a reproduction and a simultaneous recording / reproducing unit that continuously performs recording or reproduction of the second audio / video information simultaneously,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size includes at least three times the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size is at least three times as long as the maximum reading / writing interruption time and the writing time to the first audio / video continuous data area of the first size or the first audio / video. Audio / video having a data size that allows continuous reading of the second audio / video information until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. A recording medium on which information is recorded using a video information recording / reproducing apparatus. A first recording / reproducing unit for recording or reproducing the first audio / video information; a second recording / reproducing unit for recording or reproducing the second audio / video information; and recording of the first audio / video information. Or a recording medium on which information is recorded using an audio / video information recording / reproducing apparatus having a reproduction and a simultaneous recording / reproducing unit that continuously performs recording or reproduction of the second audio / video information simultaneously,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or Until the first audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the second size is secured, The data size allows continuous reading of the first audio / video information,
The second size is at least a time that is twice as long as the maximum interruption time of reading and writing and a time for writing to the first audio / video continuous data area having a data size that is twice the first size, or Until the second audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the first size is secured, A recording medium in which information is recorded using an audio / video information recording / reproducing apparatus having a data size capable of continuously reading out second audio / video information. A step of recording or reproducing the first audio / video information, a step of recording or reproducing the second audio / video information, a recording or reproduction of the first audio / video information, and the second audio / video. A recording medium on which information is recorded using an audio / video information recording / reproducing method including a step of simultaneously recording or reproducing information at the same time,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is three times the maximum interruption time of reading and writing, and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least three times as long as the maximum interruption time of reading and writing, a writing time in the first audio / video continuous data area of the first size, or the first audio / video. Audio / video having a data size that allows continuous reading of the second audio / video information until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. A recording medium on which information is recorded using a video information recording / reproducing method. A step of recording or reproducing the first audio / video information, a step of recording or reproducing the second audio / video information, a recording or reproduction of the first audio / video information, and the second audio / video. A recording medium on which information is recorded using an audio / video information recording / reproducing method including a step of simultaneously recording or reproducing information at the same time,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or Until the first audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the second size is secured, The data size allows continuous reading of the first audio / video information,
The second size is at least a time that is twice as long as the maximum interruption time of reading and writing and a time for writing to the first audio / video continuous data area having a data size that is twice the first size, or Until the second audio / video information for the total time including the read time from the first audio / video continuous data area having a data size twice the first size is secured, A recording medium on which information is recorded using an audio / video information recording / reproducing method having a data size capable of continuously reading the second audio / video information. A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is three times the maximum interruption time of reading and writing, and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least three times as long as the maximum interruption time of reading and writing, a writing time to the first audio / video continuous data area of the first size, or the first audio / video use time. The data size is such that the second audio / video information can be continuously read until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. An audio / video information recording / reproducing apparatus. A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size includes at least a time that is twice as long as the maximum interruption time of reading and writing and a write time to the first audio / video continuous data area having a data size that is twice as large as the second size. The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the first size or the first time. Data that allows the second audio / video information to be continuously read out until the second audio / video information for the total time including the read time from one audio / video continuous data area is secured. An audio / video information recording / reproducing apparatus characterized by having a size. A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first reproduction unit writes or reads the first audio / video information at a speed Vr, the first audio / video information is recorded or reproduced at a maximum speed Vout, and the second reproduction unit When the speed at which the second audio / video information is written to or read from the disk is Ar, the maximum speed at which the second audio / video data is recorded or reproduced is Aout, and the maximum read / write interruption time is t _seek ,
The first size is a size that allows continuous reading of the first audio / video data for a time of t _V-CDA ,
The second size is a size that allows continuous reading of the second audio / video data for a half time of t _A-CDA ,
The t _V-CDA and the t _A-CDA are (Vr−Vout) t _V-CDA = Vout × (3t _seek + t _A-CDA )
(Ar−Aout) t _A−CDA = 2 × Aout × (3t _seek + t _V-CDA )
An audio / video information recording / reproducing apparatus characterized by simultaneously satisfying two relational expressions represented by: A first recording / reproducing unit for recording or reproducing the first audio / video information;
A second recording / reproducing unit for recording or reproducing second audio / video information;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first reproduction unit writes or reads the first audio / video information at a speed Vr, the first audio / video information is recorded or reproduced at a maximum speed Vout, and the second reproduction unit When the speed at which the second audio / video information is written to or read from the disk is Ar, the maximum speed at which the second audio / video data is recorded or reproduced is Aout, and the maximum read / write interruption time is t _seek ,
The first size is a size that allows continuous reading of the first audio / video data for half the time of t _V-CDA ,
The second size is a size that allows continuous reading of the second audio / video data for a half time of t _A-CDA ,
The t _V-CDA and the t _A-CDA are (Vr−Vout) t _V-CDA = 2 × Vout × (2t _seek + t _A-CDA )
(Ar−Aout) t _A−CDA = 2 × Aout × (2t _seek + t _V-CDA )
An audio / video information recording / reproducing apparatus characterized by simultaneously satisfying two relational expressions represented by: A first reproduction unit for reproducing first audio / video information;
A second playback unit for playing back second audio / video information;
A simultaneous playback unit that continuously plays back both the first and second audio / video information;
A first audio / video buffer memory for storing the first audio / video data read by the simultaneous playback unit, and a second for storing the second audio / video data read by the simultaneous playback unit With audio / video buffer memory,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The simultaneous reproduction unit may transfer the first or second audio / video data from the first and second audio / video continuous data areas to the first or second audio / video buffer memory, respectively. In order to read
Playback is possible over the total time of the readout time from the second continuous audio / video data area having a data size that is at least twice or three times the maximum interruption time of reading and writing and twice the second size. An audio / video information recording / reproducing apparatus that instructs continuous reading until the first audio / video data is stored in the first audio / video buffer memory. A first reproduction unit for reproducing first audio / video information;
A second recording unit for recording second audio / video information;
A simultaneous recording / reproducing unit that continuously performs the reproduction of the first audio / video information and the recording of the second audio / video information;
A first audio / video buffer memory for storing the first audio / video data read by the simultaneous recording / reproducing unit, and a second for storing the second audio / video data by the simultaneous recording / reproducing unit. With audio / video buffer memory,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The simultaneous recording / reproducing unit reads from the first audio / video continuous data area to the first audio / video buffer memory, and outputs a second audio / video continuous from the second audio / video buffer memory. Instructed alternately to write to the area,
Playback is possible over at least the total time of reading from the second audio / video continuous data area having a data size twice or three times the maximum interruption time of reading and writing and twice the second size. An audio / video information recording / reproducing apparatus that instructs continuous reading until the first audio / video data is stored in the first audio / video buffer memory. A first reproduction unit for reproducing first audio / video information;
A second recording unit for recording second audio / video information;
A simultaneous recording / reproducing unit that continuously performs the reproduction of the first audio / video information and the recording of the second audio / video information;
A first audio / video buffer memory for storing the first audio / video data read by the simultaneous recording / reproducing unit, and a second for storing the second audio / video data to be written by the simultaneous recording / reproducing unit. Audio / video buffer memory
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The simultaneous recording / reproducing unit reads from the first audio / video continuous data area to the first audio / video buffer memory, and outputs a second audio / video continuous from the second audio / video buffer memory. Instructed alternately to write to the area,
The second data that can be reproduced over a total time of at least twice the maximum interruption time of reading and writing and a read time from the first audio / video continuous data area having a data size that is twice the first size. An audio / video information recording / reproducing apparatus that instructs continuous writing of audio / video data from the second audio / video buffer memory. Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size is at least a time that is three times the maximum interruption time of reading and writing, and a writing time to the first audio / video continuous data area having a data size that is twice the second size, or the The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least three times as long as the maximum interruption time of reading and writing, a writing time to the first audio / video continuous data area of the first size, or the first audio / video use time. The data size is such that the second audio / video information can be continuously read until an extra second audio / video information corresponding to the total time of reading from the continuous data area is secured. Audio / video information recording / playback method. Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The first size includes at least a time that is twice as long as the maximum interruption time of reading and writing and a write time to the first audio / video continuous data area having a data size that is twice as large as the second size. The first audio / video information can be continuously read until an extra amount of the first audio / video information corresponding to the total time of reading from the first audio / video continuous data area is secured. Data size,
The second size includes at least a time that is twice as long as the maximum interruption time of reading and writing and a writing time to the first audio / video continuous data area having a data size that is twice the first size or the first time. Data that allows continuous reading of the second audio / video information until an extra second audio / video information corresponding to the total time of reading from one audio / video continuous data area is secured. An audio / video information recording / reproducing method characterized in that it is a size. Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
Writing the first audio / video information or reading it to Vr; recording or playing the first audio / video information at a maximum speed Vout; writing the second audio / video information to the disc; Alternatively, when Ar is the reading speed, Aout is the maximum speed at which the second audio / video data is recorded or reproduced, and t _seek is the maximum read / write interruption time,
The first size is a size that allows continuous reading of the first audio / video data for a time of t _V-CDA ,
The second size is a size that allows continuous reading of the second audio / video data for a half time of t _A-CDA ,
The t _V-CDA and the t _A-CDA are (Vr−Vout) t _V-CDA = Vout × (3t _seek + t _A-CDA )
(Ar−Aout) t _A−CDA = 2 × Aout × (3t _seek + t _V-CDA )
An audio / video information recording / reproducing method characterized by simultaneously satisfying two relational expressions represented by: Recording or reproducing the first audio / video information;
Recording or reproducing the second audio / video information,
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
Writing the first audio / video information or reading it to Vr; recording or playing the first audio / video information at a maximum speed Vout; writing the second audio / video information to the disc; Alternatively, when Ar is the reading speed, Aout is the maximum speed at which the second audio / video data is recorded or reproduced, and t _seek is the maximum read / write interruption time,
The first size is a size that allows continuous reading of the first audio / video data for half the time of t _V-CDA ,
The second size is a size that allows continuous reading of the second audio / video data for a half time of t _A-CDA ,
The t _V-CDA and the t _A-CDA are (Vr−Vout) t _V-CDA = 2 × Vout × (2t _seek + t _A-CDA )
(Ar−Aout) t _A−CDA = 2 × Aout × (2t _seek + t _V-CDA )
An audio / video information recording / reproducing method characterized by simultaneously satisfying two relational expressions represented by: Reproducing the first audio / video information;
Reproducing the second audio / video information;
A simultaneous reproduction step of continuously performing reproduction of both the first and second audio / video information,
Storing the first audio / video data read out in the simultaneous reproduction step in a first audio / video buffer memory;
Storing the second audio / video data read out in the simultaneous reproduction step in a second audio / video buffer memory;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
In the simultaneous reproduction step, the first or second audio / video data is transferred from the first and second audio / video continuous data areas to the first or second audio / video buffer memory, respectively. In order to read
Playback is possible over the total time of reading time from the second audio / video continuous data area having a data size at least twice or three times the maximum interruption time of reading and writing, and twice the second size. An audio / video information recording / reproducing method in which continuous reading is instructed until the first audio / video data is stored in the first audio / video buffer memory. Reproducing the first audio / video information;
Recording the second audio / video information;
A simultaneous recording / reproducing step of continuously performing the reproduction of the first audio / video information and the recording of the second audio / video information together,
Storing the first audio / video data read out in the simultaneous recording / reproducing step in a first audio / video buffer memory;
Storing the second audio / video data in a second audio / video buffer memory by the simultaneous recording / reproducing step;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The simultaneous recording / reproducing step includes reading from the first audio / video continuous data area to the first audio / video buffer memory and second audio / video buffer continuous from the second audio / video buffer memory. Instructed alternately to write to the area,
Playback is possible over at least the total time of reading from the second audio / video continuous data area having a data size that is twice or three times the maximum interruption time of reading and writing and twice the second size. An audio / video information recording / reproducing method in which continuous reading is instructed until the first audio / video data is stored in the first audio / video buffer memory. Reproducing the first audio / video information;
Recording the second audio / video information;
A simultaneous recording / reproducing step of continuously performing the reproduction of the first audio / video information and the recording of the second audio / video information together,
Storing the first audio / video data read out in the simultaneous recording / reproducing step in a first audio / video buffer memory;
Storing the second audio / video data in a second audio / video buffer memory by the simultaneous recording / reproducing step;
The first audio / video information is composed of a set of first audio / video continuous data areas composed of a plurality of physically continuous recording units,
The second audio / video information is composed of a set of second audio / video continuous data areas composed of a plurality of physically continuous recording units,
The data size of the first audio / video continuous data area is not less than the first size,
The data size of the second audio / video continuous data area is not less than the second size,
The simultaneous recording / reproducing step includes reading from the first audio / video continuous data area to the first audio / video buffer memory and second audio / video buffer continuous from the second audio / video buffer memory. Instructed alternately to write to the area,
The second data that can be reproduced over a total time of a read time from the first audio / video continuous data area having a data size that is at least twice the maximum interruption time of reading and writing and a data size that is twice the first size. An audio / video information recording / reproducing method for instructing continuous writing of audio / video data from the second audio / video buffer memory.

Images