JPH043371A - Disk recorder and disk reproducer - Google Patents

Abstract

PURPOSE:To reproduce a data even at the time of off-tracking of a head by rotating a disk at a rotating speed N-times as fast as an input data transfer speed and scanning the next track plural times during the time of storing an input data of this track in a storage means. CONSTITUTION:At the data recording time, the disk 1 is rotated at the rotating speed N-times as fast as the disk rotating speed corresponding to the input data transfer speed via a spindle motor 2, an RF circuit 4 and a servo control circuit 11. During the time of storing a memory 10 with the next data of one track of input data to be supplied continuously from a terminal 20, the data is recorded to an objective track by scanning the track plural times with the head 1 via a recording data forming means consisting of a data controller 6, a memory 7, an error correction circuit 8, a modulation circuit 15 and a laser driving circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field III The present invention relates to a disk recording device and a disk reproducing device, and relates to a disk capable of correctly recording data even when a storage head falls off a track due to vibration, for example. The present invention relates to a recording device, and more particularly to a disk reproducing device that can continuously reproduce data even when the reproducing head is off the track due to vibration or the like.

B0 Summary of the Invention The disk recording device according to the present invention includes a drive unit that rotates the disk at a rotational speed N times the rotational speed of the disk corresponding to the transfer speed of input data, and a drive unit that records data by scanning the tracks of the disk. a recording head that stores at least one track of continuously supplied input data; and a storage device that converts the data read from the storage device into recording data having a transfer rate N times the transfer rate. The recording data forming means supplies the recording data to the recording node, and the data for one track accumulated in the storage means is transferred to the storage means for the next I/O.
During the time to accumulate the input data for a track, it is recorded on the destination track as recording data at N times the transfer speed, and when the time elapses, the 1
By having a control means that performs control to record data for a track onto the next target track, it is possible to correctly record input data that is continuously supplied even when the recording head deviates from the track due to vibration etc. This is how it was done.

In addition, the disk recording device according to the present invention includes a driving means for rotating the disk at a rotational speed N times the disk rotational speed corresponding to the transfer speed of reproduced data, and a drive means for continuously recording by scanning the tracks of the disk. A playback head that plays back data, a data playback means that plays back playback data from a playback signal from the playback head, and one track of playback data from the data playback means, and the stored playback data is transferred at the above transfer rate. A storage means that continuously outputs data, and a playback head scans the same track for the time required for the disk to rotate N times, and control is performed so that the playback head starts playing the next track when the time has elapsed. By having a control means to perform this, continuous data reproduction can be performed even when the reproducing head is off track due to vibration or the like.

C0 Conventional technology In a disc playback device, such as a CD player that plays compact discs, the disc is rotated at a constant linear velocity (CLV) by a spindle motor, and a laser beam is irradiated along a spiral track formed on the disc. A music program (digital data) recorded as a pit string on a track is reproduced by detecting changes in the intensity of reflected light depending on the presence or absence of the pits.

Furthermore, the error rate when reproducing data in a CD player may be, for example, about 10-5, and error detection codes and error correction codes are used to correct some errors, and in normal usage environments. This has been done so that there are no problems.

D0 Problems to be Solved by the Invention Incidentally, in the case of in-vehicle CD players or portable CD players, unlike stationary type CD players used at home, large vibrations are applied, for example, the optical head that scans the track. In some cases, the servo control may not operate normally, such as when the servo moves off the track (hereinafter referred to as off-track), and normal data reproduction cannot be performed. In this case, even if the above-mentioned error detection code or error correction code is used, the error cannot be corrected, and the playback of the music program is hindered, such as playback being interrupted.

As described above, in disc playback devices such as CD players and video disc players, there is a problem in that when the playback head goes off-track due to vibration or the like, the continuous playback of information such as audio programs, video programs, etc. is interrupted.

One way to solve this problem is to have a large buffer memory, so that the data played back by the playback head,
For example, data of a music program is temporarily stored in the above-mentioned sofa memory, and the data stored in this sofa memory is output as playback data, and even while the playback head is off-track, the data stored in this buffer memory is A known method is to output the music program as playback data and play the music program continuously. However, with this method, time is required to store data in the buffer memory before playing the music program, making it impossible to start playing the music program immediately, and the capacity of the buffer memory becomes extremely large. Ta.

Furthermore, even in disk recording devices that can record data, such as magnetic disk devices, write-once optical disk devices, and rewritable optical disk devices, if the recording head goes off track due to vibration, for example, data recording will be interrupted and the data will not be recorded continuously. The input data supplied by the system could not be recorded.

The present invention has been made in view of the above circumstances, and it is possible to continuously supply input data even when the recording head goes off-track in a usage environment with relatively large vibrations, such as in a vehicle or a portable device. The purpose of the present invention is to provide a disc recording device that can correctly record.

Another object of the present invention is to provide a disc playback device that can perform continuous data playback even when the playback head goes off-track.

E. Means for Solving the Problems In order to solve the above problems, the disk recording device according to the present invention uses a drive that rotates the disk at a rotational speed N times the rotational speed of the disk corresponding to the transfer speed of input data. a recording head that scans the tracks of the disk and records data; a storage device that stores at least one track of continuously supplied input data; and a storage device that stores the data read from the storage device. recording data forming means that converts the recorded data into recording data having a transfer rate N times the transfer rate and supplies the recorded data to the recording head; and l stored in the storage means.
The data for one track is recorded on the target trunk/link as recording data at the transfer rate N times as described above during the time for storing input data for the next one track in the storage means, and when the above time has elapsed. The apparatus is characterized by comprising a control means for controlling recording of one track worth of data accumulated in the storage means during the time into the next target track.

Further, the disc playback device according to the present invention includes a drive unit that rotates the disc at a rotation speed N times the disc rotation speed corresponding to the transfer speed of playback data, and a drive unit that scans the tracks of the disc to continuously record data. a playback head for playing back data; a data playback means for playing back playback data from a playback signal from the playback head; and a data playback means for storing one track of the playback data, and the stored playback data as described above. a storage means that outputs data continuously at a transfer speed; the playback head scans the same track for the time required for the disk to rotate N times; and when the time period has elapsed, the playback head plays the next track. The invention is characterized in that it has a control means for performing control to start the process.

F0 effect In the disk recording device according to the present invention, the disk is rotated at a rotational speed N times the disk rotational speed corresponding to the input data transfer speed, and continuously supplied input data is directly recorded on the disk. Instead, one track of input data is temporarily stored in the storage means. Then, the recording head is made to scan the same track, an error correction code is added to the data for one track recorded in this storage means, and after a predetermined modulation is applied, the data is recorded on the target track. During the time period during which input data for the next track is stored in the storage means, the data stored in the storage means is repeatedly recorded until the data is correctly recorded on the target track.

Further, in the disk playback device according to the present invention, the disk is rotated at N times the disk rotation speed corresponding to the transfer speed of playback data, and the playback head scans the same track N times to read data for one track. After reproduction, demodulation, and error correction, one track's worth of reproduced data is stored in the storage means.

The playback data for one track stored in the storage means is outputted at a predetermined data transfer rate, so that even when the playback head goes off-track, the playback data stored in the storage means can be continuously output. and output it.

G. Embodiment Hereinafter, an embodiment of a disc recording device and a disc reproducing device according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of a magneto-optical disk device to which a disk recording device and a disk reproducing device according to the present invention are applied.

First, the configuration of the magneto-optical disk device shown in FIG. 1 will be explained.

In FIG. 1, a disk 1 is moved by a spindle motor 2 at a speed N times the disk rotational speed corresponding to the transfer speed of input data supplied via a terminal 20 or playback data outputted via the terminal 20, for example. It is rotated at a constant linear velocity (CL) or constant angular velocity (CAV) corresponding to N times the data transfer rate defined by the position of the terminal 20.

The disk 1 is, for example, a magneto-optical disk, and the recording tracks are formed in groups formed in a spiral or concentric shape, or land portions between the groups, and various data are recorded on these tracks by so-called thermomagnetic recording. The data is recorded after being subjected to predetermined modulation, and the recorded data is reproduced. In other words, synchronization signals, address information, data, etc. are recorded alternately along the trunk in accordance with a predetermined format, and the synchronization signals provide synchronization during data recording and data reproduction. data is managed using address information. In addition, in the data recording area, various data such as music programs and video programs are recorded along with error correction codes (ECC) and data transfer rate information corresponding to the type of data to be recorded. It looks like this.

The optical head 3 is composed of, for example, a laser light source such as a laser diode, optical components such as a collimator lens, an objective lens, a polarizing beam splitter, and a cylindrical lens, and a photodetector divided into predetermined positions. When recording, the laser beam from the laser light source is pulse-modulated by the laser drive circuit 16 based on the recording data under the magnetic field generated by the coil 17, and is irradiated onto the recording surface of the target track of the disk l to generate heat. When recording data by magnetic recording and reproducing data from the disk 1, a laser beam is irradiated onto the recording surface of the target track of the disk 1, and in cooperation with the RF circuit 4 having a matrix configuration, the recording surface is A playback signal is generated by detecting the difference in the polarization angle (Kerr rotation angle) of the reflected light from the lens, a focus error signal is detected by, for example, the so-called astigmatism method, and a tracking error signal is detected by, for example, the so-called bush-pull method. It looks like this.

The RF circuit 4 binarizes the playback signal and supplies it to the demodulation circuit 5, and also supplies the focus error signal and tracking error signal to the servo control circuit 11.

The demodulation circuit 5 includes, for example, a phase-locked loop (hereinafter referred to as PLL), a synchronization detection circuit, a demodulator, and the like. That is, the PLL reproduces the clock signal recorded on the disk 1 from the binary signal. In addition, the synchronization detection circuit detects a synchronization signal from the binarized signal using the clock signal from the PLL and pulls in synchronization, and also synchronizes when the synchronization signal cannot be detected due to dropout, jitter, etc. Perform synchronization protection to prevent the device from becoming disconnected. Further, the demodulator demodulates the binarized signal using a predetermined demodulation method, converts it into reproduction data of 8 bits per symbol, for example, and detects the data transfer rate information recorded together with the data on the disc l. do. Then, the demodulation circuit 5 supplies the reproduced data to the data controller 6, and the clock signal,
Information necessary for system control, such as synchronization signals and data transfer rate information, is supplied to the system controller 12.

Under the control of the system controller 12, the data controller 6 temporarily stores the reproduced data from the demodulation circuit 5 in the memory 7 during data reproduction, and stores the reproduced data from the demodulation circuit 5 in the memory 7 in the error correction (ECC) circuit 8. The memory 7 and the error correction circuit 8 are controlled to perform error correction of reproduced data temporarily stored in the memory 7 and the error correction circuit 8. and,
The data controller 6 supplies error-corrected reproduced data to the switch circuit 9. The data controller 6 also controls the switch circuit 9 when recording data.
The memory 7 is configured to temporarily store input data supplied through the memory 7 in the memory 7, and add an error correction code to the input data temporarily stored in the memory 7 in the error correction circuit 8. and controls the error correction circuit 8.

The data controller 6 then supplies the input data to which the error correction code has been added to the modulation circuit 15. Also,
The data controller 6 compares the input data stored in the memory 7 with the reproduced data from the demodulation circuit 5 to determine whether or not the input data has been correctly recorded on the disc 1. is supplied to the system controller 12.

The switch circuit 9 is connected to the system controller 12.
When reproducing data, the data controller 6 outputs the reproduced data directly to the terminal 20 or outputs it to the terminal 20 via the one-track memory 10.
Switches whether to output 0 or not, and when recording data,
The input data supplied through the terminal 20 is switched to be supplied directly to the data controller 6 or to be supplied to the data controller 6 via the one-track memory 10.

During data reproduction, the one-track memory 10 temporarily stores one track of error-corrected reproduced data from the data controller 6, and when the optical head 3 starts moving to the next track. Then, this stored reproduction data is outputted via the switch circuit 9 and the terminal 20 at a specified data transfer rate. Also,
During data recording, the one-track memory 10 stores input data that is continuously supplied via the switch circuit 9, and when one track's worth of input data is stored,
The stored input data for one track is supplied to the data controller 6 via the switch circuit 9. Specifically, for example, the 1-track memory IO is configured with a first memory and a second memory each having a capacity for 1 track, and when reproducing data, the optical head 3
The data reproduced while the optical head 3 scans the same track is stored in the first memory, and the data stored in the second memory when the optical head 3 scans the previous track is stored as the reproduction data according to the specified reproduction data. It outputs via the terminal 20 at the data transfer rate. Further, when data reproduced from the disk 1 is stored in the second memory,
The data stored in the first memory is output as reproduced data via the terminal 20 at a specified data transfer rate. By alternately using the first memory and the second memory in this manner, the reproduced data outputted from the one-track memory 10 via the terminal 20 becomes continuous. Furthermore, during data recording, while one track of continuously supplied input data is stored in the first memory, one track of input data stored in the second memory is stored in the data controller. Supply to 6. Also,
While one track's worth of input data is being stored in the second memory, one track's worth of input data stored in the first memory is supplied to the data controller 6. By alternately using the first memory and the second memory in this way, the continuous input data supplied via the terminal 20 can be transmitted to the data controller 6 via the switch circuit 9 without being lost. supply

The modulation circuit 15 performs predetermined modulation on input data to which an error correction code is added from the data controller 6 using a clock signal from the system controller 12, and also modulates the data transfer rate from the system controller 12. Information is added to form recorded data having a transfer rate N times the transfer rate of the input data, and this recorded data is supplied to the laser drive circuit 16.

The laser drive circuit 16 includes a coil 17 as described above.
The laser light source of the optical head 3 is pulse-modulated based on the recorded data under the magnetic field generated by the optical head 3. As a result, data is recorded on the tracks of the disk 1.

On the other hand, the servo control circuit 11 includes, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a thread servo control circuit, and the like. That is, the focus servo control circuit drives the objective lens of the optical head 3 in the optical axis direction so that the focus error signal from the RF circuit 4 becomes zero.

Further, the tracking servo control circuit drives the objective lens of the optical gutter 3 in the disk radial direction so that the tracking error signal from the RF circuit 4 becomes zero. Further, the spindle motor servo control circuit includes the demodulation circuit 5.
The spindle motor 2 is controlled so that the PLL is locked. Further, the thread servo control circuit moves the gutter 3 to the optical system in the disk radial direction based on a control signal from the system controller 12. The servo control circuit 11 configured in this way supplies, for example, information indicating the operating state of each section controlled by the servo control circuit 11 to the system controller 12.

The system controller 12 uses the operating state information of each part from the servo control circuit 11, information necessary for system control from the demodulation circuit 5, and data transfer rate information supplied via the terminal 21, for example. The demodulation circuit 5, data controller 6, memory 7,
Error correction circuit 8, switch circuit 9.1 track memory 10, servo control circuit 11, modulation circuit 15, coil 17
control.

Thus, in this embodiment, during data recording, the drive means for rotating the disk 1 at a rotational speed N times the rotational speed of the disk corresponding to the transfer speed of input data is the spindle motor 2, the RF circuit 4, and the servo control circuit. 11, the optical head 3 is used as a recording head for scanning the tracks of the disk l and recording data, and the optical head 3 is used as a recording head for recording data by scanning the tracks of the disk
The track memory 10 is used as a storage means for accumulating one track of continuously supplied input data, and converts the data read from the one track memory 10 into recorded data having a transfer rate N times the above transfer rate. The recording data forming means that is converted and supplied to the optical head 3 is composed of the data controller 6, memory 7, error correction circuit 8, modulation circuit 15, and laser drive circuit 16. The accumulated data for one track is transferred to the next one in one track memory.
During the time for accumulating input data for a track, it is stored in the target track as recorded data at N times the transfer speed, and when the above-mentioned time has elapsed, the input data for one track accumulated in the one-track memory 10 during that time is stored in the destination track. It is used as a control means to control recording of data to the next target track.

Further, during data reproduction, a driving means for rotating the disk l at a rotational speed N times the disk rotational speed corresponding to the transfer speed of the reproduced data is composed of the spindle motor 2, the RF circuit 4, and the servo control circuit 11, and The optical groove 3 is used as a reproducing head that scans the tracks of the disc 1 and reproduces continuously recorded data, and the data reproducing means for reproducing the reproduced data from the reproduction signal from the optical groove 3 is the RF. It is composed of a circuit 4 to an error correction circuit 8, and the one-track memory 10 is used as a storage means for storing one track of reproduced data from the data reproducing means and continuously outputting the stored reproduced data at the above-mentioned transfer speed. The system controller 12 causes the optical head 3 to scan the same track for the time required for the disk 1 to rotate N times, and when the above-mentioned time has elapsed, the optical head 3 starts playing the next track. It is used as a control means to control the

Next, the operation when recording data on the magneto-optical disk device configured as above will be explained using the flowchart shown in FIG. 2.

Here, for example, set the rotational speed of the disk 1 to 1800 rpm.
-, one track of disk 1 consists of lO sectors (10 sectors/track), one sector consists of 98 segments (98 segments/sector), and the data capacity that can be used by the user in l segment is 24 bytes. shall be. In other words, the time (period) for one rotation of the disk 1 is 33 (1 ÷ (1800 ÷ 60)) ms, and the maximum data transfer rate that can be supplied via the terminal 20 is 300 ms.
(1800 ÷ 60 x 10) seconds. Furthermore, the transfer speed of input data supplied via the terminal 20 is defined by the type of data, and if the value is R seconds, then data for one track (10 sectors) is input. The time T required for this is 10+R.

The input data supplied via the terminal 20 is, for example, a so-called CD-I (CD-Interactive).
media) Nice CD-DA mode data 1/
This is B-level stereo mode data compressed to 4. By the way, the specified data transfer rate R for this B-level stereo mode data is 18.75 sectors/
It is said to be seconds. Therefore, the time T required to manually input two troughs of input data via the terminal 20
is 533 (10÷18.75)ms. In other words, while input data for one tran is input through the terminal 20, the disk l4! l 6 (300÷18.75
) will rotate.

In step STI of the flowchart shown in FIG. 2, the system controller 12 determines the data transfer rate information supplied via the terminal 21, that is, the above R,
When the data transfer rate R corresponds to the above maximum data transfer rate of 300 sectors/sec, the process proceeds to step ST2; otherwise, the process proceeds to step ST3. In the specific example in which B-level stereo mode data is input as described above, the data transfer rate R is 18.75 sectors/sec, so the process proceeds to step ST3.

In step ST2, the system controller 12 controls the switch circuit 9 to connect the contacts 9a and 9C of the switch circuit 9, and to connect the contacts 9d and 9f, and also controls the switch circuit 9 to Rad 3
control to move to the next track. As a result,
Input data at a data transfer rate of 300 sectors/second, which is input via a terminal 20 every time the disk 1 rotates once, is sequentially recorded on the disk 1 after being subjected to a predetermined modulation or the like.

On the other hand, in step ST3, the system controller 12 calculates the time T required to accumulate two troughs worth of input data in the one track memory 10 (referred to as buffer time equal to or less than 10+R), and In the case of the above-mentioned B level stereo mode in which the contacts 9f and 9e are connected and the process proceeds to step ST4, the buffer time T is 533+s.

In step ST4, the system controller 12 compares the elapsed time t from the time when the storage of one track worth of input data was started in the one track memory 10 with the buffer time T, and if the elapsed time t is small, the system controller 12 performs step ST4.
4 is repeated, and when the elapsed time t becomes equal to the buffer time T, the process proceeds to step ST5. That is, step ST4 is looped until input data for one track is stored in, for example, the first memory of the one-track memory 10. Note that in order to sequentially record input data that is continuously supplied as described above onto the disk 1 without any loss, when data storage in the first memory of the track memory IO is completed, the input data is sequentially stored in the second memory. Start data accumulation.

In step ST5, the system controller 12 connects the contacts 9a and 9b of the switch circuit 9. As a result, in step ST4, l track memory 1
One track worth of input data stored in the first memory 0 is stored in the memory 7 via the switch circuit 9 and the data controller 6. Then, as described above, the recording data to which the error correction code and data transfer rate information (R) have been added and which has been subjected to predetermined modulation is recorded on the target track, and the process proceeds to step ST6.

In step ST6, the recorded data is reproduced in order to determine whether or not the data recorded in the target track in step ST5 is correct, and the data controller 6 reads the data stored in the memory 7 as described above. The input data and reproduced data are compared, and the comparison results are sent to the system controller 12. Then, when the data is recorded correctly, the system controller 12
The process proceeds to step ST9, and if the data is not recorded correctly, the process proceeds to step ST7.

In step ST9, since data recording has been performed correctly, the system controller 12 moves the optical head 3 to the next target track, and returns to step STI.

On the other hand, in step ST7, the system controller 12 compares the elapsed time t from the start time of input data accumulation in the second memory of the one-track memory 10 with the buffer time T, and if the elapsed time is small, then The process proceeds to step ST8, and when the elapsed time t becomes equal to the buffer time T, the process proceeds to step STIO.

In step ST8, the system controller 12 records data and data transfer rate information on the same track again, and returns to step ST6.

That is, the system controller 12 performs step ST
In the loop from Step 6 to Step ST8, during the time period in which input data for the next one track is stored in the second memory of the one track memory 10, the recording operation and correct recording are performed so that the data is recorded correctly on the current target track. Repeat the operation (verify) to confirm the accuracy.

On the other hand, in step 5TIO, the system controller 12 detects that data recording was not performed correctly on the target track during the time for storing input data for the next one track in the one track memory 10, so the system controller 12 detects an error as a data recording error, for example. Perform display.

As described above, one track of input data supplied at a specified data transfer rate R is stored in the one-track memory 10, and the disk 1 is rotated at a rotational speed N times the disk rotational speed corresponding to the data transfer rate R. Then, the optical head 3 scans the same track multiple times to record the data stored in the one-track memory 10, and during the time when the next one-track worth of input data is stored in the one-track memory 10. , by repeating the data recording operation so that data can be recorded correctly on the target track.
For example, even if the optical head 3 goes off-track due to vibration or the like, as long as the optical head 3 correctly scans the target track at least once, input data continuously supplied to the disk 1 can be recorded correctly. Further, by converting the input data into recording data having a transfer rate N times the transfer rate of the input data in the modulation circuit 15, data can be continuously recorded on the tracks of the disk l.

Next, the operation when reproducing data from the magneto-optical disk device shown in FIG. 1 will be explained using the flowchart shown in FIG. 3.

As in the case of the data recording operation described above, the rotational speed of the disk 1 is set to 1800 rpm, one track of the disk 1 consists of LO sectors (10 sectors/track), and an L sector consists of 98 segments (98 segments/track). /sector), and the data capacity available to the user within the l segment is 24 bytes. That is, disk 1
The time (period) for one revolution is 33 (1+ (1800
÷60) )+ws, and the maximum data transfer rate that can be output via terminal 20 is 300 (1800÷60X
10) The sector is 7 seconds.

Furthermore, the data transfer speed of playback data outputted via the terminal 20 is defined by the type of data, and if the value is 7 seconds for R sector, 1 track (10 sectors)
The time T required to output minutes of data is 10+
It becomes R.

Then, the data recorded on the disc 1 is transferred to the so-called CDI in the same way as in the data recording operation.
B-level data compressed to 1/4 of D-DA mode data.
If the data is in stereo mode, the specified data transfer rate R is 18.75 sectors/second. Therefore, the time T required to reproduce one track's worth of data and output it via the terminal 20 is 533 (10+18
．． 75)ms. In other words, while outputting data for l tracks through the terminal 20, the disk l has 16
(300 18.75) rotate.

In step STI of the flowchart shown in FIG. 3, the system controller 12 determines the data transfer rate information read from the disk 1 as described above, that is, the above R, and determines that the data transfer rate R is equal to the maximum data transfer rate 300. If the sector/second is applicable, the process proceeds to step ST2, and if not, the process proceeds to step ST3. is 1
Since it is 8.75 sectors/sec, the process advances to step ST3.

In the STEN 7” ST2, the system controller 12
controls the switch circuit 9 so that the contacts 9a and 9c of the switch circuit 9 are connected, and the contacts 9d and 9f of the switch circuit 9 are connected, and the optical disc 3 is moved to the next track every time the disk 1 rotates once. Control to move. As a result, reproduction data reproduced every time the disk 1 rotates once is outputted via the terminal 20 at a data transfer rate of 300 sectors/second.

On the other hand, in step ST3, the system controller 12 determines the time T (・10÷R) required to transfer one track's worth of data and the time T (・10÷R) required to read one track's worth of data from the disk 1 from this time T. While calculating the time T (・T-33+ms, hereinafter referred to as buffer time) obtained by subtracting the necessary time, the contact 9 of the switch circuit 9 is
A and contact 9b are connected, and the process proceeds to step ST4. In the case of the above-mentioned B level stereo mode, the buffer time T is 500 (533-33) ■S.

In step ST4, the system controller 12 determines the elapsed time t from the time when scanning of the target track is started.
When the elapsed time is smaller than the buffer time T, the process proceeds to ST5, and when it becomes equal to the buffer time T8, the process proceeds to step ST6.

In step ST5, the system controller 12 controls the optical head 3 to scan the same track, and returns to step ST4. That is, in the loop of steps ST4 and ST5, the system controller 12 controls the optical head 3 to scan the same track when the elapsed time t is less than the buffer time T.

Then, the reproduced data reproduced by scanning the same track with the optical head 3 is stored in, for example, the first memory of the one-track memory 10.

In step ST6, the system controller 12 connects the contacts 9e and 9f of the switch circuit 9 in order to output the playback data for one track stored in the first memory of the l-track memory 10 in step ST5, and also connects the contacts 9e and 9f of the switch circuit 9. , controls the optical head 3 to move to the next track. As a result, the reproduced data for 1 track stored in the first memory of the 1 track memory 10 in step ST5 is outputted via the terminal 20 at the data transfer rate R defined by the type of data. In the case of the B-level stereo mode described above, playback data is output at a data transfer rate of 18.75 sectors/second.

Note that while the reproduction data stored in the first memory of the one-track memory is being output, the reproduction data for the next one track is stored in the second memory. This results in
Reproduction data is continuously outputted via the terminal 20 at a specified data transfer rate.

By the way, for example, when playing a music program, in order to shorten the so-called access time, that is, the time from when a playback instruction is issued until the music program is actually played, the steps from step ST3 are performed at the start of playback. You may go directly to step ST6, that is,
The same track may be scanned once and the reproduced data may be immediately output.

As described above, the disk l is rotated at a rotational speed N times the disk rotational speed corresponding to the data transfer rate R, data is reproduced by the optical head 3 scanning the same track multiple times, and the reproduced data is By storing one track in one track memory 10 and outputting reproduced data from this one track memory 10 at a predetermined data transfer rate R, for example, even if the optical head 3 goes off-track due to vibration, the bumper time can be reduced. If the optical head 3 correctly scans the target track at least once within T, the correct playback data for l tracks will be stored in the one track memo 1J10. The reproduced data can be output, and continuous data reproduction becomes possible.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can of course be applied to, for example, a so-called CD-ROM, a write-once optical disk device, a magnetic disk device, etc. Further, the present invention can be applied to a disk device that uses a disk that rotates at a constant linear velocity (CAV).

Effects of the H0 Invention As is clear from the above explanation, the disk recording device according to the present invention stores one track of human data that is continuously supplied at a specified data transfer rate in the storage means,
The recording head rotates the disk at a rotational speed that is N times the rotational speed of the disk corresponding to the human data transfer speed, and the recording head changes the target rank multiple times during the time period during which the next track's worth of input data is stored in the storage means. By repeating the data recording operation so that one track of input data stored in the storage means can be recorded correctly, even if the recording head goes off track midway, the data can be continuously supplied. input data can be recorded correctly. Furthermore, data can be continuously recorded on the tracks of the disk 1 by converting the input data into recording data having a transfer rate N times the transfer rate of the input data in the recording data forming means. In particular, it is possible to perform normal data recording even in a usage environment with relatively large vibrations, such as in a vehicle.

Further, in the disc playback device according to the present invention, the disc is rotated at a disc rotation speed of N corresponding to the transfer speed of playback data.
The data is reproduced so that the reproduction head scans the same track for the time required for the disk to rotate N times, and one track of the reproduced data is temporarily stored in the storage means. By outputting the reproduced data at a specified data transfer rate, even if the playback head goes off track midway, the playback head scans the same track multiple times and reproduces the data, ensuring that the correct data is reproduced from the disc. In addition, instead of directly outputting the playback data read from the disc, the playback data for one track is temporarily stored in the storage means, and then the playback data is output from the storage means at a specified data transfer rate. Since the data is output, continuous data reproduction can be performed. especially,
It is possible to perform normal data reproduction even in a usage environment with relatively large vibrations, such as in a vehicle.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of a magneto-optical disk device to which a disk recording device and a disk reproducing device according to the present invention are applied, FIG. 2 is a flow chart showing a data recording operation, and FIG. 3 is a flowchart showing a playback operation. 1... Disk 2... Spindle motor 3... Optical head 4... RF circuit 5... Demodulation circuit 6... Data controller 7... Memory 8... Error correction circuit 10...・1 track memory 12...System controller 15...Paper modulation circuit 16...Laser drive circuit 70-1000 yards Fig.2

Claims (2)

[Claims] (1) Drive means that rotates the disk at a rotational speed N times the rotational speed of the disk corresponding to the transfer speed of input data, and a recording head that scans the tracks of the disk and records data, and is continuously supplied. storage means for accumulating at least one track of input data to be input; and data read from the storage means at a transfer rate of N
recording data forming means that converts the recorded data into recording data having double the transfer speed and supplies the recorded data to the recording head; During the storage time, data for one track is recorded on the target track at the transfer rate N times higher than the above, and when the above time has elapsed, the data for one track accumulated in the storage means during the time is stored for the next purpose. 1. A disc recording device comprising: a control means for controlling recording on a track. (2) A drive means that rotates the disk at a rotational speed N times the disk rotational speed corresponding to the transfer speed of playback data, and a playback head that scans the tracks of the disk and plays back continuously recorded data. and a data reproducing means for reproducing the reproduced data from the reproduction signal from the reproducing head; storing one track of the reproduced data from the data reproducing means and continuously outputting the stored reproduced data at the above transfer rate. a storage means; controlling the playback head so that it scans the same track for the time required for the disk to rotate N times, and when the time has elapsed, the playback head starts playing the next track; 1. A disc playback device comprising a control means.