JPH05342583A - Disk recording device and reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable continuous digital information to be recorded / reproduced on / from an optical disc by a single recording / reproducing system. [Structure] When recording, the first digital information 102
The memory means 101 is intermittently read and recorded, and the writing of the second digital information 110 to the second memory means 111 is stopped. After transferring the optical head 4 to another track of the optical disk 1 and on-tracking it,
During reproduction, the optical disc 1 to the second digital information 110
Is intermittently reproduced and written in the second memory means 111, and the reading of the first digital information 102 from the first memory means 101 is stopped. The above operation is repeated in time division to record continuous input digital information with a single optical head and simultaneously reproduce continuous output digital information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording digital information such as voice and video on a recording medium, or a reproducing device for reproducing digital information such as voice and video from the recording medium.

[0002]

2. Description of the Related Art Conventionally, a disk or tape has been used as a medium for recording video and audio.

As a disk for recording voice, for example,
A compact disc (CD) is well known as a read-only disc. Recently, write-once and rewritable optical disks have also been developed. On the other hand, a laser disc is well known as a disc on which an image is recorded by an analog method. Hereinafter, a case where digital audio information is recorded on a conventional optical disc will be described as an example.

FIG. 13 is a diagram showing the track configuration of a conventional rewritable optical disc, and FIG. 14 is a diagram showing the configuration of an apparatus for recording digital information on a conventional rewritable optical disc. In FIG. 13, reference numeral 1 denotes an optical disc, which has a spiral track 2 on which information is recorded, and the track 2 is evenly divided to form a sector. Addresses are added to the sectors in the ascending order from the inner circumference, and signals are continuously recorded from the inner circumference. The rotation of the disk is controlled by CLV (Constant Li
near Veocity).

In the optical disc 1 having the above-mentioned structure,
The operation of recording digital audio information will be described below. In FIG. 14, 1 is an optical disk, 4 is an optical head, and 5 is a spindle drive means. 6
Is a spindle, the rotation of which is controlled by the spindle drive means 5 to rotate the optical disc 1. Reference numeral 7 is a spindle control means, 8 is a spindle control signal, 9 is a spindle control command, 10 is an access control means for transferring the optical head 4 from the inner circumference to the outer circumference of the optical disk 1 and for on-tracking on the track 2, and 11 is an access. Control signal, 12 is access control command, 13 is input digital voice information, 1
4 is a recording means, 15 is a recording signal, 16 is a reproduction signal, 17
Is reproduction means, 18 is output digital audio information, and 19 is system control means. In FIG. 14, the input digital audio information 13 is applied to the recording means 14, is added with parity for error correction, and is further modulated to generate a mark pattern on the spiral track on the disk 1, for example, 8 bits to 14 bits. A recording signal 15 is generated by performing EFM modulation for conversion and adding a synchronization signal. The spindle control means 7 rotates the optical disc 1 at a substantially constant linear velocity. Further, the optical head 1 is transferred onto the track 2 and on-tracked by the access control signal 11 provided from the access control means 10.

On the other hand, in the reproducing system, the reproduced signal 16 reproduced from the optical head 4 is input to the reproducing means 17, demodulated and error-corrected. The output digital information 18 is output from the reproducing means 17.

[0007]

However, in the above-mentioned conventional configuration, since only the reproduction or the recording can be performed, the digital audio or video information is continuously reproduced from the optical disc 1 and the optical disc is simultaneously recorded on the optical disc. A problem arises in that continuously input digital audio or video information cannot be continuously recorded.

The present invention solves the above-mentioned conventional problems. When recording and reproducing digital information on an optical disk, the single optical head is used to reproduce the digital information from the optical disk 1 and continuously output it. At the same time, simultaneously input digital information can be recorded in another area on the optical disc. Also,
Continuously input digital information on the optical disc 2
It is possible to record in the area of the place. Further, it is possible to continuously output digital information reproduced from two areas on the optical disc 1.

[0009]

To achieve this object, a disk recording apparatus according to the first invention of the present application uses an optical head to record digital information on an optical disk having a sector in which spiral or concentric tracks are divided. A recording / reproducing apparatus for recording / reproducing, comprising: information compression means for compressing input digital information on a time axis; first memory means for storing information output from the information compression means; and write address of the first memory means. For generating the read address of the first memory means according to the address control command, and the first memory means for recording according to the recording / reproducing command. The first digital information is recorded on the optical disc, and the second disc is recorded on the optical disc during reproduction. Recording / reproducing means for reproducing the digital information, second memory means for storing the second digital information, second write address generating means for generating a write address of the second memory means in accordance with the address control command, Second read address generation means for generating a read address of the second memory means, information decompression means for decompressing the information output from the second memory means on the time axis, and the first for recording according to the recording / reproducing command. The first digital information is read from the memory means and the second digital information is read.
Writing the second digital information to the memory means and stopping reading the first digital information from the first memory means during reproduction, and writing the second digital information to the second memory means. Time division address control means for generating a control command, access control means for moving the optical head in the radial direction of the optical disk and on-tracking according to the access control command, the recording / reproducing command and the access for instructing recording or reproduction. And a recording / reproducing control means for outputting a control command.

Further, the disk recording apparatus of the second invention of the present application is a recording apparatus for recording digital information on an optical disc having a sector in which spiral or concentric tracks are divided by using an optical head, and the first input Information compression means for compressing the digital information and the second input digital information on the time axis, and the first information output from the information compression means.
First memory means for storing the digital information of the
Output from the information compression means, first write address generation means for generating the write address of the memory means, first read address generation means for generating the read address of the first memory means in accordance with the address control command. Second memory means for storing the second digital information, second write address generating means for generating a write address of the second memory means, and a read address of the second memory means according to the address control command. Second read address generating means, first digital information read from the first memory means according to the selection recording command, and second read information from the second memory means.
Selecting the digital information of the first digital information and recording it on the optical disc, and when recording the first digital information in accordance with the selection recording command, the first digital information is read from the first memory means and the second digital information is read. When the reading of the second digital information from the memory means is stopped and the second digital information is recorded, the second digital information is read from the second memory means and the first digital information is read.
Time division address control means for generating the address control command for stopping the reading of the first digital information from the memory means, and access for moving the optical head in the radial direction of the optical disk and on-tracking according to the access control command. The control means is provided with a selection recording control means for outputting the selection recording command and the access control command.

The apparatus of the third invention of the present application is the first invention of the present application.
In addition to the above invention or the second invention, synchronization information for generating synchronization information indicating a synchronization relationship between the first division information including the first digital information and the second division information including the second digital information. TO for recording the generation means and the division number and start address of each of the first division information and the second division information
In the TOC area on the optical disc having a C area,
A recording means for recording the synchronization information in association with the division number and the start address is provided.

Further, the disk recording apparatus of the fourth invention of the present application is a reproducing apparatus for reproducing digital information from an optical disk having an sector formed by dividing a spiral or concentric track using an optical head, and in accordance with a selective reproduction command. Selective reproducing means for reproducing either the first digital information or the second digital information from the optical disc, the first memory means for storing the first digital information, and the first memory means for following the address control command. First write address generating means for generating a write address, first read address generating means for generating a read address of the first memory means, and information for time-axis expanding the information output from the first memory means. Expansion means,
Second memory means for storing second digital information;
Second write address generation means for generating a write address of the second memory means according to the address control command, second read address generation means for generating a read address of the second memory means, and second memory means. Information decompression means for decompressing the information output from the time base,
When the first digital information is reproduced according to the reproduction instruction, the first digital information is written in the first memory means and the second digital information is stopped from being written in the second memory means. When reproducing, the time division address control means for writing the second digital information in the second memory means and the address control command for stopping the writing of the first digital information in the first memory means, and the access control Access control means for moving the optical head in the radial direction of the optical disc and on-tracking in accordance with the command, and selective reproduction control means for outputting the selective reproduction command and the access control command are provided.

In addition to the fourth invention of the present application, the disk recording apparatus of the fifth invention of the present application is the second invention including the first division information including the first digital information and the second digital information.
Synchronization information extracting means for extracting synchronization information indicating a synchronization relationship with the section information from the TOC area on the optical disc, and the first section information and the second section information are synchronously reproduced based on the synchronization information. And means for doing so.

[0014]

According to the disk recording / reproducing apparatus of the first invention of the present application, the first digital information continuously inputted at the time of recording is compressed and written in the first memory means by the above-mentioned constitution, and the time division address is obtained. The control means issues an address control instruction to read the first digital information from the first memory means and stop writing the second digital information to the second memory means in accordance with the recording / reproducing instruction. The first digital information is read from the first memory means and recorded on the optical disc. When the difference between the first write address and the first read address is less than or equal to a predetermined threshold value, the first
The reading of the first digital information from the memory means is stopped, the recording is stopped, and the optical head is moved to another track on the optical disk and on-track.
During reproduction, the time division address control means issues the address control instruction for writing the second digital information in the second memory means in accordance with the recording / reproduction instruction. The second digital information is read from the optical disc and written in the second memory means. When the difference between the second write address and the second read address is greater than or equal to a predetermined threshold value, the writing of the second digital information to the second memory means is stopped. The second output digital information is expanded from the second memory means and continuously output. As mentioned above,
A single optical head can be used to record continuous input digital information on the optical disc and continuously output digital information reproduced from the optical disc.

According to the disk recording apparatus of the second invention of the present application, the first digital information which is continuously input is compressed and written in the first memory means by the above-mentioned configuration, and the time division address control means is selected. According to the recording command, the first digital information is read from the first memory means and an address control command is issued to stop the reading of the second digital information from the second memory means. The first digital information is read from the first memory means and recorded on the optical disc. When the difference between the first write address and the first read address is less than or equal to a predetermined threshold value, the first
The reading of the first digital information from the memory means is stopped, the recording is stopped, and the optical head is moved to another track of the optical disk and on-track. Further, the continuously input second digital information is compressed and written in the second memory means, and the time division address control means reads the second digital information from the second memory means in accordance with the selective recording command. Issue the address control command. The second digital information is read from the second memory means and recorded on the optical disc. When the difference between the second write address and the second read address is less than or equal to a predetermined threshold value, the reading of the second digital information from the second memory means is stopped and the recording is stopped. As described above, a single optical head can be used to record two-input continuous digital information on the optical disc.

The disk recording apparatus according to the third invention of the present application has the above-mentioned structure, in addition to the functions of the first and second embodiments of the present invention,
Of the first division information and the second division information including the second division information including the second division information including the first division information including the second division information and the first division information including the second division information. The synchronization information can be recorded in the TOC area for recording the number and the start address in association with the division number and the start address.

According to the disk recording / reproducing apparatus of the fourth invention of the present application, when reproducing the first digital information, the time division address control means makes the first digital means to the first memory means in accordance with the selective reproduction command when reproducing the first digital information. An address control command for writing the information and stopping the writing of the second digital information to the second memory means is issued. The first digital information is reproduced from the optical disc and written in the first memory means. The first output digital information is continuously read from the first memory means, decompressed and output. When the difference between the first write address and the first read address is greater than or equal to a predetermined threshold value, the writing of the first digital information to the first memory means is stopped and the optical head is connected to another optical disc. Transfer to truck and on-track. Further, when reproducing the second digital information, the time division address control means issues the address control instruction for writing the second digital information in the second memory means in accordance with the selective reproduction instruction. The second digital information is reproduced from the optical disc and written in the second memory means. The second output digital information is continuously read from the second memory means, decompressed and output. When the difference between the second write address and the second read address is greater than or equal to a predetermined threshold value, the writing of the second digital information to the second memory means is stopped. As described above, the first reproduction digital information and the second reproduction digital information can be reproduced from the optical disk by using a single optical head and continuously output.

According to the fifth aspect of the present invention, in addition to the fourth operation of the present application, the disc reproducing apparatus of the fifth aspect of the present invention has the second division including the first division information including the first digital information and the second digital information. Of the first digital information and the second digital information by extracting from the TOC area in which the respective division numbers and start addresses of the first division information and the second division information are recorded. Synchronous reproduction with digital information is possible.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The first embodiment of the present invention records continuously input digital audio information on an optical disc while repeating recording, reproduction and access by time division using a single optical head, and at the same time, from the optical disc. This is a case where reproduced digital audio information is continuously output. The optical disc 1 has the same configuration as that of FIG. Further, the addresses of the sectors used for recording are added in the order of ascending from the inner circumference, and the recording is performed according to the addresses of the above sectors.

FIG. 1 is a diagram showing the configuration of a recording / reproducing apparatus in the first embodiment of the present invention, FIG. 2 is a diagram showing the configuration of tracks on an optical disk, and FIG. 3 is a recording timing in the first embodiment of the present invention. FIG.

In FIG. 1, 1, 4 to 12 are the same as those of the conventional example shown in FIG. 99 is the first input digital information, 100 is the information compression means, 101 is the first memory means, 102 is the first digital information output from the first memory means 101, and 103 is the first memory means 101.
Write address generation means for generating a write address, 104 is a first write address, 105 is a first read address generation means for generating a read address of the first memory means 101, and 106 is a first read address. Address 107 is recording / reproducing means, 108 is a recording signal, 109 is a reproducing signal, 110 is second digital information output from the recording / reproducing means 107, 111 is second memory means, and 112 is second memory means 111. Second write address generating means for generating a write address of
Reference numeral 113 is a second write address, 114 is a second read address generating means for generating a read address of the second memory means 111, 115 is a second read address, 116 is an information expanding means, 117 is a second output. Digital information, 118 is a time division address control unit, 119 is an address control command, 120 is a tracking signal detection unit, 121 is an on-track signal, 122 is a recording / reproducing command, and 123 is a recording / reproducing control unit.

FIG. 2 shows a spiral track on the optical disc 1, and the track is divided into sectors. A set of sectors is called a cluster and is recorded in units of clusters. Further, the set of clusters constitutes division information. In FIG. 2, 131 is the first division information, 132
Is the second segment information, 133 is a schematic trajectory when the first segment information 131 is accessed from the second segment information 132,
Reference numeral 134 denotes the first division information 131 to the second division information 132.
Is a schematic locus when accessing to, 135 is a cluster on the first division information 131, 136 is the second division information 13
It is a cluster on 2.

FIG. 3 is a diagram showing the timing of recording / reproducing in the first embodiment of the present invention. How the amount of data in the first memory means 101 and the second memory means 111 changes during recording / reproducing. Indicates what to do. In FIG. 3, a recording unit in which a predetermined number of sectors are collected is called a cluster, and addresses are added to each cluster in the order of ascending from the inner circumference like the sectors. In FIG. 3, each cluster of the first digital information 102 is DR1.
0, DR11, ..., Each cluster of the second digital information 110 is designated as DP20, DP21, DP22 ,. The on-track signal 121 is off-track when it is "1" and on-track when it is "0". Also, 15
Reference numeral 1 is a first threshold value indicating the stop of reading in the first memory means 101, and 152 is a second threshold value indicating the start of writing in the second memory means 111.

The operation of the disk recording / reproducing apparatus of the present embodiment having the above-described structure will be described below with reference to FIGS. The first input digital information 99 is time-axis compressed by the information compression means 100,
The first memory means 10 according to the write address 104 of
1 and is read as the first digital information 102 by the first read address 106. Then, the first digital information 102 is recorded / reproduced by the recording / reproducing means 107.
Then, the parity for error correction is added, the synchronization signal is added, the signal is modulated by EFM or the like, and is output as the recording signal 108. Further, similarly to the conventional example shown in FIG. 14, the spindle control means 7 rotates the optical disc 1 at a substantially constant linear velocity. Further, the optical head 4 has access control means 10
Track 2 by access control signal 11 given from
Transported and on-tracked. At this time, the signal rate of the digital information in the recording signal 108 is higher than the signal rate of the first input digital information 99, and the reading speed of the first digital information 102 is higher than the writing speed of the first input digital information 99. .. On the other hand, in the reproduction system, the reproduction signal 10 reproduced from the optical head 4
9 is input to the recording / reproducing means 107, demodulated, and subjected to error correction. The second output from the recording / reproducing means 107
Digital information 110 of the second write address 11
3 is written in the second memory means 111, is read by the second read address 115, and is time-axis expanded by the information expansion means 116, and second output digital information 117 is output.

In section T10 of FIG. 3, a recording / reproducing command 12 is issued.
Reference numeral 2 designates the reproduction mode, and the recording / reproduction means 107 is in the reproduction mode. Further, in response to the instruction of the recording / reproducing command 122, the time division address control means 118 stops reading the first digital information 102 from the first memory means 101, and the second write address generation means 112 Second to second memory means 111
Address control command 1 for writing the digital information 110 of
19 is output to the first read address generation means 105 and the second write address generation means 112.
The reproduction signal 109 reproduced from the second division information 132 on the optical disc 1 is input to the recording / reproducing means 107, demodulated, and error-corrected. The second digital information 110 output from the recording / reproducing means 107 is written in the second memory means 111 by the second write address 113, read by the second read address 115, and the time axis by the information expanding means 128. It is decompressed and output as output digital information 117. In this case, the second
Since the data read speed from the memory means 111 is lower than the data write speed, the data amount of the second memory means 111 increases as shown in FIG. The data amount of the second memory means 111 can be obtained as the difference between the second write address 113 and the second read address 115. When the amount of data in the second memory means 111 exceeds the second threshold value 152, the recording / reproducing control means 1
23 issues a recording / playback command 122 instructing to stop playback.
Upon receiving the instruction of the recording / reproducing instruction 122, the time division address control means 118 sends an instruction to stop the generation of the second write address 113 to the second write address generation means 112. As a result, the reproduction operation ends, and the first division information 1
The access operation to 31 is started. That is, the section T of FIG.
11, the recording / reproduction control means 123 instructs the access control means 10 to set the optical head 4 to the second division information 132.
Output the access control command 12 to transfer and on-track to the first sorting information 131. Reference numeral 133 in FIG. 2 is a schematic locus when the first division information 131 is accessed from the second division information 132. First classification information 131
The on-track signal 121 detected and generated by the tracking signal detecting means 120 can be used to determine whether the on-track has occurred. The tracking signal detection means 120 of FIG. 1 detects a tracking error signal from the reproduction signal 109, and when on-track, "0" is set as the on-track signal 121, and when it is off-track.
1 "is access control means 10 and recording / reproduction control means 12
Output to 3. When the recording / reproducing control means 123 receives "0" as the on-track signal, it instructs recording. In a section T12 shown in FIG. 3, the recording / reproducing control unit 123 outputs a recording / reproducing command 122 for instructing recording, and the recording / reproducing unit 107 is in the recording mode. According to the instruction of the recording / reproducing command 122, the time division address control means 118 issues an address control command 119 for starting the reading of the first digital information 102 from the first memory means 101 to the first read address generating means 105. Output. Then, the first digital information 102 read from the first memory means 101 is subjected to error correction parity addition and EFM modulation. The recording / reproducing means 107 records the recording signal 108 on the first division information 131 on the optical disc 1. In this case, since the data read speed from the first memory means 101 is higher than the data write speed, the data amount of the first memory means 101 decreases as shown in FIG. First memory means 101
The data amount of can be obtained as the difference between the first write address 104 and the first read address 106. When the data amount of the first memory means 101 becomes equal to or less than the first threshold value 151, the recording / reproducing control means 123 sends a command to stop recording to the time division address control means 118 and the recording / reproducing means 107. The time division address control means 118 sends an address control command 119 for stopping the generation of the first read address 106 to the first read address generation means 105. As a result, the recording operation is completed, and the access operation from the first division information 131 to the second division information 132 is started. In the section T13, the recording / reproducing control means 1
23 outputs a command to the access control means 10 to transfer the optical head 4 from the first division information 131 to the second division information 132 and to perform on-track. Reference numeral 134 in FIG. 2 is a schematic trajectory when the first division information 131 is accessed to the second division information 132. Whether or not the second division information has been on-track can be determined by the on-track signal 121 as in the case of the on-track determination for the first division information. After the section T14, sections T10 to T
Repeat 13.

As described above, according to the first embodiment of the present invention, a single optical head repeats recording, reproduction, and access in a time-division manner while continuously inputting digital audio information. It is possible to continuously output the digital audio information reproduced from the optical disc at the same time as recording on the optical disc.

FIG. 4 shows a second embodiment of the present invention. The second embodiment of the present invention is the first and second continuously input.
In this case, the digital audio information of is recorded in the division information of two places on the optical disk in a time division manner. The optical disc 1 is shown in FIG.
3 and the structure of the tracks of the optical disc 1 is the same as that of the first embodiment of the present invention shown in FIG. Further, the addresses of the sectors used for recording are added in the order of ascending from the inner circumference, and the recording is performed according to the addresses of the above sectors.

FIG. 4 is a diagram showing the construction of a recording apparatus in the second embodiment of the present invention, and FIG. 5 is a diagram showing the recording timing in the second embodiment of the present invention. In FIG.
1, 4 to 12 are the same as in the conventional example shown in FIG. Further, 99 to 109, 111 to 115, 118 to 121 are the same as those of the first embodiment of the present invention shown in FIG. 201
Is the second input digital information, 202 is the second recorded digital information output from the second memory means 111, 2
Reference numeral 03 is an information selecting means for selecting the first digital information 102 and the second digital information 202 based on the selective recording command 205, and 206 is a selective recording control means.

FIG. 5 is a diagram showing the timing of recording in the second embodiment of the present invention, and how the amount of data in the first memory means 101 and the second memory means 111 changes during recording. Is shown. In FIG. 5, the second
Each cluster of the digital information 202 of DR20, DR
21, DR22, ...

The operation of the disk recording apparatus of this embodiment having the above-mentioned structure will be described below with reference to FIGS. 2 and 4 to 5. The first input digital information 99 is time-axis compressed by the information compression means 100, and the first memory means 1 by the first write address 104.
01, and is read by the first read address 106. At this time, it is assumed that the signal rate of the digital information in the recording signal 108 is higher than the signal rate of the input digital information 99, and the reading speed of the first digital information 102 is higher than the writing speed of the first input digital information 99. On the other hand, the second input digital information 201 is similarly time-axis compressed by the information compression means 100, written in the second memory means 111 by the second write address 113, and read by the second read address 11.
5 is read. Only one of the first digital information 102 and the second digital information 202 is selected by the information selecting means 203 and added to the recording means 107, the error correcting parity is added by the recording means 107, and the synchronization signal is transmitted. It is added, modulated by EFM or the like, and output as a recording signal 108. Further, similarly to the first embodiment of the present invention shown in FIG. 1, the spindle control means 7
Causes the optical disc 1 to rotate at a substantially constant linear velocity. Also,
The optical head 1 is transferred onto the track 2 and on-tracked by an access control signal 11 provided from the access control means 10. In FIG. 5, the selection recording command 205 is "
1 "or" 2 "is instructed. When" 1 ", the first digital information 102 is selected and recorded, and when" 2 ", the second digital information 202 is selected and recorded. It means to do.

In the section T20 of FIG. 5, the selective recording command 205 indicates "2", and the time division address control means 118 sends the first read address generation means 105 a signal from the first memory means 101. The reading of the first digital information 102 is stopped, and the second memory means 1 is read from the second read address generating means 114.
An address control command 119 for reading the second digital information 110 from 11 is output. In addition, the selection record command 2
According to the instruction of 05, the information selecting means 203 is in a mode for selecting and recording the second digital information 202, so that the second digital information 202 is subjected to parity addition for error correction and EFM modulation, and recorded. Playback means 107
Thus, the recording signal 108 is recorded in the second division information 132 on the optical disc 1. In this case, the second memory means 1
Since the data read speed from 11 is faster than the data write speed, the data amount of the second memory means 111 is shown in FIG.
It decreases as shown in. The data amount of the second memory means 111 can be obtained as the difference between the second write address 113 and the second read address 115. Second
Data amount of the memory means 111 of the first threshold 151
When the following occurs, the selective recording control unit 206 sends a command to stop the generation of the second read address 115 to the second read address generation unit 114, and sends a command to stop the recording to the recording unit 107. This makes the second
The operation of recording the digital information 202 of
The access operation from the section information 132 to the first section information 131 is started. That is, in the section T21 of FIG.
The selective recording control means 206 outputs a command to the access means 10 to move and on-track the optical head 4 from the second division information 132 to the first division information 131.
Reference numeral 133 in FIG. 2 is a schematic locus when the first division information 131 is accessed from the second division information 132. First
It is the same as the first embodiment of the present invention shown in FIG. 1 that the on-track signal 121 detected and generated by the tracking signal detecting means 120 is used to determine whether the on-track of the section information 131 of FIG. Selection recording control means 20
When 6 receives "0" as the on-track signal, it issues a selective recording command 205 for recording the first digital information 102. As a result, the information selection means 203 selects the first digital information 102. In the section T22, the time division address control means 118 receives the address control instruction 119 for starting the reading of the first digital information 102 from the first memory means 101 in response to the instruction of the selective recording instruction 205, and the first read address generation means 105.
Output to. The first digital information 102 read from the first memory means 101 is subjected to error correction parity addition and EFM modulation, and is then recorded in the recording means 107.
Thus, the recording signal 108 is recorded in the first division information 131 on the optical disc 1. In this case, the first memory means 1
Since the data reading speed from 01 is higher than the data writing speed, the data amount of the first memory means 101 is as shown in FIG.
It decreases as shown in. The data amount of the first memory means 101 can be obtained as the difference between the first write address 104 and the first read address 106. First
Data amount of the memory means 101 of the first threshold 151
When the following occurs, the selective recording control means 206 sends a command to stop recording to the time division address control means 118 and the recording means 204. The time division address control means 118 is the first
Address control command 119 for stopping the generation of the read address 106 of the first read address generation means 105.
Send to. As a result, the recording operation is completed, and the access operation from the first division information 131 to the second division information 132 is started. In the section T23, the selective recording control unit 206 instructs the access control unit to set the optical head 4 to the first division information 13
A command to transfer and on-track from 1 to the second sorting information 132 is output. 134 in FIG. 2 is the first classification information 1
It is a schematic trajectory when the second classification information 132 is accessed from 31. After the section T24, sections T20 to T23
repeat.

As described above, according to the second embodiment of the present invention, a single optical head repeats recording and access in a time-division manner, and continuously outputs two-input digital audio information. It can be recorded on an optical disc.

FIGS. 6 and 7 show a third embodiment of the present invention. The third embodiment of the present invention, in addition to the first embodiment of the present invention, includes first division information 131 and second division information 132.
This is a case where the synchronization information indicating the synchronization relationship with is recorded in the TOC.

FIG. 6 is a diagram showing the structure of a recording / reproducing apparatus in the third embodiment of the present invention, and FIG. 7 is a diagram showing the TOC in the third embodiment of the present invention. 6, 1, 4
12 to 12 are the same as the conventional example shown in FIG. Also, 99
106 to 108 to 122 are the same as the first embodiment of the present invention shown in FIG. 301 is TOC extraction means, 302
Is reproduction TOC information, 303 is TOC generation instruction, 304 is TOC generation means, 305 is synchronization information generation instruction, 306 is synchronization information generation means, 307 is recorded TOC information, and 308 is first digital information 102 for error correction. It is a recording / reproducing means for generating a recording signal 108 together with the recording TOC information 307 by adding parity, adding a synchronization signal, and performing modulation such as EFM. In FIG. 7, reference numeral 351 is the division number of the division information, 352 is the start address of the division information having the division number 351, and 353 is the corresponding division information showing the correspondence between the division information, which is shown by the division number of the corresponding division information. Be done. Reference numeral 354 is phase difference information of the division information 351 based on the division information recorded in the corresponding division information 353, which is given by, for example, a delay time. The third embodiment of the present invention basically operates in the same manner as the first embodiment of the present invention, but the information indicating the synchronization relationship between the second division information 132 and the first division information 131, that is, The difference is that both or one of the corresponding classification information 353 and the phase difference information 354 is recorded on the TOC.

The operation of the third disc recording / reproducing apparatus of the present embodiment having the above-mentioned configuration will be described below with reference to FIGS. 2, 6 and 7. In the reproducing system, the reproduced signal 109 reproduced from the optical head 4 is input to the recording / reproducing means 308, demodulated and error-corrected. The second digital information 110 output from the recording / reproducing means 308 is written in the second memory means 111 by the second write address 113, read by the second read address 115, and the information decompressing means 116.
Then, the time axis is expanded and output as the output digital signal 11. In addition, the TO reproduced by the TOC extraction means 301
The C information 302 is extracted and supplied to the TOC generation means 304 and the recording / reproduction control means 309.

Further, in the recording system, the first input digital information 99 is time-axis compressed by the information compression means 100, written in the first memory means 101 by the first write address 104, and read by the first read address. 1
It is read out as the first digital information 102 according to 06. Then, the first digital information 102 is added with error correction parity by the recording / reproducing means 308, and a synchronization signal is added together with the recorded TOC information 307, and EF is added.
It is output as a recording signal 108 after being subjected to modulation such as M. The synchronization information generation means 306 is a synchronization information generation command 305.
Based on the first classification information 131 and the second classification information 13
The synchronization information indicating the synchronization relationship with 2 is generated and supplied to the TOC generation means 304. The TOC generation means 304 generates the recorded TOC information 307 based on the recording / reproduction command 122 given from the recording / reproduction control means 309 to generate the recording / reproduction means 3.
Supply to 08. Further, similarly to the first embodiment of the present invention shown in FIG. 1, the spindle control means 7 rotates the optical disc 1 at a substantially constant linear velocity. Further, the optical head 1 is transferred onto the track 2 and on-tracked by the access control signal 11 provided from the access control means 10. Figure 7
In the second section information 132, section number 1h (h:
Hexadecimal number), and the first division information 131 has a division number 10h. Here, when reproducing the first division information 131, the second division information 132
Shall be played at the same time. Therefore, 1h is recorded in the corresponding section information area of the TOC section number 10h. By doing so, when reproducing the first division information 131, the corresponding division information 353 of the TOC is referred to, the division number 1h can be known, and the reproduction can be performed simultaneously. Furthermore, when it is desired to set a time difference when reproducing the first division information 131 and the second division information 132, the time difference may be recorded in the area of the phase information 354. In the case of FIG. 7, 10 h is set as the phase difference information 354.
Is recorded, and if the physical unit is 10 milliseconds, the second
It is sufficient to reproduce the first division information with a delay of 160 milliseconds with respect to the division information 132 of.

As described above, according to the third embodiment of the present invention, by using a single optical head, recording, reproduction and access are repeated in a time division manner, and continuously inputted digital audio information. It is possible to continuously output the digital audio information reproduced from the optical disk at the same time that the data is recorded on the optical disk, and further to set the synchronization information between the recorded digital audio information and the reproduced digital audio information. You can

Incidentally, in the third embodiment of the present invention,
Although the case where the recording and the reproduction are performed at the same time has been shown, the same applies to the case where the two continuously input digital audio information which is continuously given is simultaneously recorded as shown in the second embodiment of the present invention.

8 and 9 show a fourth embodiment of the present invention. The fourth embodiment of the present invention is a case where the division information recorded at two locations on the optical disc is reproduced in time division and output as continuous digital information. The optical disk 1 has the same structure as that of FIG. 13, and the track structure of the optical disk 1 is the same as that of the first embodiment of the present invention shown in FIG. The addresses of the sectors of the optical disk 1 are added in the order of increasing power from the inner circumference, and reproduction is performed according to the addresses of the above sectors.

FIG. 8 is a diagram showing the structure of a reproducing apparatus according to the fourth embodiment of the present invention, and FIG. 9 is a diagram showing the reproduction timing in the fourth embodiment of the present invention. In FIG.
1, 4 to 12 are the same as in the conventional example shown in FIG. Further, 101, 103 to 106, 109 to 121 are the same as the first embodiment of the present invention shown in FIG. Reference numeral 401 is a selective reproduction means, 402 is first digital information, 403 is first output digital information, and 404 is a selective reproduction instruction for instructing whether to reproduce the first digital information 402 or the second digital information 110. , 405 are selective reproduction control means.

FIG. 9 is a diagram showing the timing of recording in the fourth embodiment of the present invention, and how the amount of data in the first memory means 101 and the second memory means 111 changes during recording. Is shown. In FIG. 9, the first
Each cluster of the digital information 402 of DP10, DP
11, ...

The operation of the disk reproducing apparatus of the present embodiment having the above-mentioned structure will be described below with reference to FIGS. 2, 8 and 9. Either the first section information 131 or the second section information 132 shown in FIG. 2 is reproduced from the optical head 4. Then, the reproduction signal 109 is input to the selective reproduction means 401, demodulated, subjected to error correction, and the first digital information 402 or the second digital information 110 is outputted from the selective reproduction means 401. The second digital information 110 is the second write address 1
13 is written in the second memory means 111,
Read out by the read address 115, and the information expansion means 116 expands the time axis to output the second output digital signal 117. First digital information 402
Are written in the first memory means 101 by the first write address 104, and the first read address 106
Is read out and time-axis expanded by the information expansion means 116, and the first output digital signal 403 is output.
Further, similarly to the first embodiment of the present invention shown in FIG. 1, the spindle control means 7 rotates the optical disc 1 at a substantially constant linear velocity. Further, the optical head 1 is transferred onto the track 2 and on-tracked by the access control signal 11 provided from the access control means 10. In FIG. 9, the selective reproduction command 404 indicates "1" or "2",
"1" means selecting and reproducing the first digital information, and "2" means selecting and reproducing the second digital information.

In the section T40 of FIG. 9, the selective reproduction command 404 indicates "2", and the optical head 4 is in the second position.
It is assumed that the classification information 132 of No. is being reproduced. The time division address control means 118 stops writing the first digital information 402 to the first memory means 101 to the first write address generation means 103, and at the same time, to the second write address generation means 112. An address control command 119 for writing the second digital information 110 to the second memory means 111 is output. Since the selective reproduction means 401 is in the mode for selecting the second digital information by the instruction of the selective reproduction instruction 404, the second digital information 110 is outputted and the second memory means 1 is outputted.
Added to 11. In this case, the second memory means 111
Since the data read speed from the memory is lower than the data write speed, the data amount of the second memory means 111 increases as shown in FIG. The data amount of the second memory means 111 can be obtained as the difference between the second write address 113 and the second read address 115. When the data amount of the second memory means 111 becomes equal to or larger than the second threshold value 152, the selective reproduction control means 405 sends a command to stop the reproduction to the time division address control means 118 and the selective reproduction means 401. The time division address generation means 118 is the second
Second command to stop the generation of write address 113
To the write address generating means 112. As a result, the operation of reproducing the second reproduction digital information ends, and the operation of accessing the first division information 131 from the second division information 132 starts. That is, in the section T41 of FIG. 9, the selective reproduction control means 206 has the access control means 10
In response to this, a command for transferring the optical head 4 from the second sorting information 132 to the first sorting information 131 and on-tracking is output. 133 in FIG. 2 indicates the first from the second classification information 132.
3 is a schematic locus when the section information 131 is accessed. It is the same as the first embodiment of the present invention shown in FIG. 1 that the on-track signal 121 detected and generated by the tracking signal detecting means 120 is used to determine whether or not the first division information 131 is on-track. Upon receiving "0" as the on-track signal, the selective reproduction control means 405 issues a selective reproduction command 404 for reproducing the first digital information 402. In the section T42, the selective reproduction means 401 reproduces the first division information 131 and outputs the first digital information 402. Also, the selective reproduction command 4
In response to the instruction from 04, the time division address control means 118
And outputs an address control command 119 for writing the first digital information 402 to the memory means 101 to the first write address generation means 104. The first digital information 402 is written in the first memory means 101, further applied to the information expanding means 116, expanded in the time axis, and output as the first output digital information 117. In this case, since the data read speed from the first memory means 101 is lower than the data write speed, the data amount of the first memory means 101 increases as shown in FIG. The data amount of the first memory means can be obtained as the difference between the first write address 104 and the first read address 106. When the data amount of the first memory means 101 becomes equal to or larger than the first threshold value 152, the selective reproduction control means 405 sends a command to stop the reproduction to the time division address control means 118 and the recording means 204. The time division address generation means 118 uses the first write address 104.
An address control command 119 for stopping the generation of the write address is sent to the first write address generating means 103. As a result, the reproduction operation is completed, and the access operation from the first division information 131 to the second division information 132 is started. In section T43,
The selective reproduction control means 405 outputs a command to the access control means 10 to transfer and on-track the optical head 4 from the first division information 131 to the second division information 132. Reference numeral 134 in FIG. 2 is a schematic trajectory when the first division information 131 is accessed to the second division information 132.
After the section T44, the sections T40 to T43 are repeated.

As described above, according to the fourth embodiment of the present invention, a single optical head is used to record in two areas on the optical disc while repeating reproduction and access in time division. The existing digital information can be reproduced as continuous digital information.

10 and 11 show the fifth embodiment of the present invention. The fifth embodiment of the present invention, in addition to the fourth embodiment of the present invention, includes first division information 131 and second division information 13
This is the case where the synchronization information indicating the synchronization relationship with 2 is recorded in the TOC.

FIG. 10 is a diagram showing the construction of a reproducing apparatus in the fifth embodiment of the present invention, and FIG. 11 is a reproduction timing chart in the fifth embodiment of the present invention. The structure of the TOC is the same as that of the third embodiment of the present invention shown in FIG. Figure 1
At 0, 1 and 4 to 12 are the same as in the conventional example shown in FIG. Further, 101, 103 to 106, 109 to 121 are the same as those in the first embodiment of the present invention shown in FIG.
2 is the same as the third embodiment of the present invention shown in FIG.
Reference numeral 404 is the same as that of the fourth embodiment of the present invention shown in FIG. The selective reproducing means 501 is basically the same as the selective reproducing means 401 in the fourth embodiment of the present invention shown in FIG. 8, but has a function of reproducing the TOC. Reference numeral 502 is synchronization information extracting means for extracting the synchronization information shown in FIG. 7, that is, the corresponding classification information 353 and the phase difference information 354, and 503 is extracted synchronization information. 504 is a delay means for giving a delay time to the second output digital information 117, 505 is a delay signal, 506 is third output digital information, and 507 is selective reproduction control means. Basically, the present invention shown in FIG. This is the same as the selective reproduction control means 405 shown in the fourth embodiment, except that a function of generating the delay signal 505 from the reproduced TOC information 302 and the synchronization information 503 is added.

FIG. 11 is a diagram showing the timing of reproduction in the fifth embodiment of the present invention, and how the amount of data in the first memory means 101 and the second memory means 111 changes during reproduction. , Also shows how a delay is added to the second output digital information. In FIG. 11, the delay time added to the first output digital information 117 is “dx”.

The fifth embodiment of the present invention basically operates in the same manner as the fourth embodiment of the present invention, but the correspondence between the second division information 132 and the first division information 131 and The difference is that the synchronization information is reproduced from the TOC and is reproduced synchronously.

The operation of the fifth disc reproducing apparatus of the present embodiment having the above-mentioned configuration will be described below with reference to FIGS. 2, 10 and 11. Either the first section information 131 or the second section information 132 shown in FIG. 2 is reproduced from the optical head 4. And the reproduction signal 1
09 is input to the selective reproduction means 401, demodulated, error-corrected, and the first digital information 402 or the second digital information 402.
The digital information 110 is output from the selective reproduction means 501. The second digital information 110 is written in the second memory means 111 by the second write address 113, read by the second read address 115, time-axis expanded by the information expansion means 116, and the output digital signal 117 is output. To be done. The first digital information 402 is written in the first memory means 101 by the first write address 104, read by the first read address 106, time-axis expanded by the information expansion means 116, and the output digital signal 403 is output. To be done.
Further, similarly to the first embodiment of the present invention shown in FIG. 1, the spindle control means 7 rotates the optical disc 1 at a substantially constant linear velocity. Further, the optical head 4 is transferred onto the track 2 and is on-track by the access control signal 11 given from the access control means 10. In FIG. 11, the selective reproduction command 404 indicates "1" or "2", "1" means selecting and reproducing the first digital information, and "2" means the second digital information. This means selecting and playing back information. The reproduction operation is basically the same as that of the fourth embodiment of the present invention shown in FIGS. 8 and 9, but the correspondence and synchronization between the second division information 132 and the first division information 131 based on the TOC information. Extract information and play it back synchronously. That is, the reproduction T by the TOC extraction means 301
The OC information 302 is extracted and added to the selective reproduction control means 507 and the synchronization information extraction means 502. The synchronization information extraction means 502 extracts the corresponding classification information 353 and the phase difference information 354 shown in FIG. 7 from the TOC information 302 and supplies it as the extracted synchronization information 503 to the selective reproduction control means 507. The selective reproduction control means 507 reads the corresponding classification information 353 and the phase difference information 354. In FIG. 7, in the first segment information, the corresponding segment information is “1h” and the phase difference information is “1h”.
It is known that the first section information 131 and the second section information 132 are information reproduced in synchronization with each other. Further, the phase difference information 354 is recorded.
Therefore, if the physical unit is 10 milliseconds, the second segment information 132 may be delayed from the first segment information 131 by 160 milliseconds and then reproduced. Therefore,
The selective reproduction control means 507 is 16 times as long as the delay means 504.
Send a delay signal 505 indicating a 0 millisecond delay. As a result, the third output digital information 506 is based on the second output digital information 117 as shown in FIG.
In this case, the data is output as "dx" with a delay of 160 milliseconds.

As described above, according to the fifth embodiment of the present invention, a single optical head is used to continuously reproduce digital audio information reproduced from an optical disk while repeating reproduction and access in a time division manner. The digital audio information can be output to the digital audio information and the synchronous reproduction can be performed based on the synchronous information between the reproduced digital audio information.

In the first to third embodiments of the present invention, optical modulation has been described as an example, but the same holds true when recording is performed using the magneto-optical effect. In this case,
The difference is that the recording signal 108 is applied not to the optical head 4 but to the magnetic head 701 during recording, as shown in FIG.
In FIG. 12, 701 is a magnetic head, 702 is a magnetic head drive means, and 703 is a magnetic head drive signal. The access control means 10 includes the magnetic head 7 together with the optical head 4.
01 is transferred to the track 2 and is on-track. Others are the same as those of the first to third embodiments of the present invention. On the other hand, at the time of reproduction, the reproduction signal is read from the optical disk 1 by the optical head 4 by utilizing the magneto-optical effect. After that,
This is similar to the first, third, and fifth embodiments of the present invention.

Further, in the first to fifth embodiments of the present invention, the case where the addresses are added from the inner circumference to the ascending order and recorded from the inner circumference has been described, but in the case of recording from the outer circumference. Is also the same. In this case, the relationship between the address difference between the first write address 104 and the first read address 106 of the first memory means 101 and the first threshold 151, and the second write of the second memory means 111. Except for this, the relationship between the address difference between the address 113 and the second read address 115 and the second threshold value 152 is reversed, and the rest is the same as in the first to fifth embodiments of the present invention.

Further, the recording / reproducing apparatus shown in the first and third embodiments of the present invention and the reproducing apparatus shown in the fifth embodiment of the present invention are similarly established in the optical disc in which the digital information is stored in the pit format. To do.

In the first to fifth embodiments of the present invention, the case where the digital audio information is recorded and reproduced has been described. However, when the digital video information is recorded and reproduced, the digital audio information is reproduced while the digital audio information is reproduced. It goes without saying that the same applies to the case of recording video information and the case of recording digital audio information while reproducing digital video information.

[0055]

As is apparent from the above embodiments, according to the first embodiment of the present invention, a single optical head is used,
It is possible to continuously reproduce digital information while simultaneously recording digital information that is continuously input onto the optical disc. For example, it becomes possible to reproduce the digital video information from the reproduction-only area and simultaneously record the digital audio information accompanying the digital video information in another area. In addition, it is possible to record a sub-audio such as a sound effect on another track while reproducing and monitoring the already-recorded main audio.

Further, according to the second embodiment of the present invention, a single optical head is used to record the second continuous input digital information while recording the first continuous input digital information on the optical disk. It is possible. For example, by recording the same input digital information in two places, double recording is possible and high reliability can be realized. In addition, it is possible to record twice or more multi-channels with a 2-channel recording device.

Further, according to the third embodiment of the present invention, in addition to the effect of the first or second embodiment, the first division information including the first digital information and the second digital information are added. It is possible to set the synchronization information with the included second division information. For example, it is possible to record the synchronization information of the digital video information already recorded in the reproduction-only area and the digital audio information recorded in the recordable area and accompanying the digital video information.

Further, according to the fourth embodiment of the present invention, the single digital head is used to continuously reproduce the first digital information from the optical disk while simultaneously continuously reproducing the second digital information. It is possible to play. This enables simultaneous reproduction of the digital video and the digital audio information accompanying the digital video information. Also, the main voice and the sound effect can be simultaneously reproduced. Further, it is possible to realize highly reliable reproduction by double reproducing the digital information which is simultaneously input and recorded in another area.

Further, according to the fifth embodiment of the present invention, in addition to the effect of the fourth embodiment, it is constituted by the first division information and the second digital information constituted by the first digital information. It is possible to read the synchronization information with the second division information to be reproduced from the TOC area on the optical disc for synchronous reproduction. Moreover, since the first digital information and the second digital information can be freely delayed and reproduced, the time lag can be easily corrected. Further, a special effect can be easily created by changing the delay time of one digital information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a disk recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a track structure of a disc in an embodiment of the present invention.

FIG. 3 is a recording timing chart showing the operation of the disk recording / reproducing apparatus in the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a disk recording device according to a second embodiment of the present invention.

FIG. 5 is a recording timing chart showing the operation of the disk recording apparatus in the second embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of a disk recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 7 is a schematic diagram showing the structure of the TOC in the third embodiment of the present invention.

FIG. 8 is a block diagram showing the configuration of a disc reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 9 is a reproduction timing chart showing the operation of the disk reproducing apparatus in the fourth embodiment of the present invention.

FIG. 10 is a block diagram showing the configuration of a disc reproducing device according to a fifth embodiment of the present invention.

FIG. 11 is a reproduction timing chart showing the operation of the disk reproducing apparatus in the fifth embodiment of the present invention.

FIG. 12 is a block diagram showing a head having another configuration in the first to third embodiments of the present invention.

FIG. 13 is a schematic diagram showing a track configuration on a conventional disc.

FIG. 14 is a block diagram showing a configuration of a conventional disk recording / reproducing device.

[Explanation of symbols]

 1 Optical Disk 4 Optical Head 101 First Memory Means 103 First Write Address Generation Means 105 First Read Address Generation Means 111 Second Memory Means 113 Second Write Address Generation Means 115 Second Read Address Generation Means 118 Time division address control means 123, 309 Recording and reproduction control means 203 Information selection means 206 Selection recording control means 301 TOC extraction means 304 TOC generation means 306 Synchronization information generation means 405, 507 Selection reproduction control means 502 Synchronization information extraction means 701 Magnetic head 702 Magnetic head drive means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kasahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Zenki Sato, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd (72) Inventor Hiroyuki Yonekura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A recording / reproducing apparatus for recording / reproducing digital information using an optical head on an optical disc having sectors in which spiral or concentric tracks are divided, and an information compression means for compressing input digital information on a time axis. First memory means for storing information output from the information compressing means, first write address generating means for generating a write address of the first memory means, and the first memory means according to an address control command. Read-out address generating means for generating a read-out address, and the first digital information read from the first memory means at the time of recording in accordance with a recording / reproducing command is recorded on the optical disc, and at the time of reproducing, the first digital information is read from the optical disc. Recording / reproducing means for reproducing the second digital information, and the second digital information A second memory means for storing the second memory means, a second memory means for generating a write address of the second memory means according to the address control command, and a second memory means for generating a read address of the second memory means. Read address generating means, information expanding means for expanding the information output from the second memory means on the time axis, and the first digital information is read from the first memory means at the time of recording in accordance with the recording / reproducing command. At the same time, the writing of the second digital information to the second memory means is stopped, the reading of the first digital information from the first memory means is stopped at the time of reproduction, and the second digital information is transferred. Time division address control means for generating the address control command to be written in the second memory means; Access control means for moving the optical head in the radial direction of the optical disc and on-tracking in accordance with the read / write control command, and recording / reproduction control means for outputting the recording / reproduction command for instructing recording or reproduction and the access control command. A disk recording / reproducing device equipped. 2. A synchronization information generating means for generating synchronization information indicating a synchronization relationship between first division information including first digital information and second division information including second digital information; The synchronization information is recorded in the TOC area on the optical disc having the TOC area for recording the division number and the start address of the first division information and the second division information in association with the division number and the start address. The disc recording / reproducing apparatus according to claim 1, further comprising: 3. A recording device for recording digital information on an optical disc having sectors divided into spiral or concentric tracks by using an optical head, wherein the first input digital information and the second input digital information are recorded in time. Information compression means for axial compression, first memory means for storing first digital information output from the information compression means, and first write address generation means for generating a write address of the first memory means. A first read address generating means for generating a read address of the first memory means according to an address control command, and a second memory means for storing second digital information output from the information compressing means, Second write address generating means for generating a write address of the second memory means, A second read address generating means for generating a read address of the second memory means according to a response control command, the first digital information and the second memory read from the first memory means according to a selective recording command. Selection recording means for selecting the second digital information read from the means and recording it on the optical disc; and for recording the first digital information in accordance with the selection recording command, the first memory means stores the first digital information in the first recording means. The first digital information is read out, the second digital information is read out from the second memory means, and when the second digital information is recorded, the second digital information is read from the second memory means. And reading the first digital information from the first memory means. Time division address control means for generating the address control command for stopping the recording, access control means for moving the optical head in the radial direction of the optical disk and on-tracking according to the access control command, the selective recording command and the access A disk recording device comprising a selective recording control means for outputting a control command. 4. Synchronous information generating means for generating synchronous information indicating a synchronous relationship between the first section information including the first digital information and the second section information including the second digital information; The synchronization information is recorded in the TOC area on the optical disc having the TOC area for recording the division number and the start address of the first division information and the second division information in association with the division number and the start address. The disk recording apparatus according to claim 3, further comprising: 5. A reproducing apparatus for reproducing digital information from an optical disk having a sector formed by dividing a spiral or concentric circular track by using an optical head, wherein the first digital information or the first digital information is reproduced from the optical disk according to a selective reproduction command. Selective reproducing means for reproducing any one of the two digital information, first memory means for storing the first digital information, and first memory means for generating a write address of the first memory means according to an address control command. Write address generation means, first read address generation means for generating a read address of the first memory means, information decompression means for decompressing the information output from the first memory means on a time axis, and Second memory means for storing the digital information of No. 2, and the upper memory according to the address control command. Second write address generating means for generating a write address of the second memory means, second read address generating means for generating a read address of the second memory means, and output from the second memory means. Information expanding means for expanding the information on the time axis, and when reproducing the first digital information in accordance with the reproduction command, the first digital information is written to the first memory means and the second memory means is written to the second memory means. When the writing of the second digital information is stopped and the second digital information is reproduced, the second digital information is written to the second memory means and the first memory means is written to the first memory means. Time-division address control means for generating the address control command for stopping the writing of digital information; Disk reproducing apparatus comprising an access control means for the optical head is on-track causes transported in the radial direction of the optical disc according to control commands, and selecting reproduction control means for outputting the said selected reproduction command and said access control command. 6. Synchronous information indicating a synchronous relationship between the first section information including the first digital information and the second section information including the second digital information is extracted from the TOC area on the optical disc. 6. The disc reproducing apparatus according to claim 5, further comprising: synchronization information extracting means; and means for synchronously reproducing the first division information and the second division information based on the synchronization information.