JPH05174385A - Playing method for disk player - Google Patents

Abstract

PURPOSE:To prevent the break of sounds by securing a servo lock state in a short time even if a track jumps and also a disk revolution out-servo state is caused by the vibrations. CONSTITUTION:When an out-servo state detecting part 16b-6 detects an out-servo state in a play mode, a system controller 14 locks the disk revolution servo state at a low linear velocity speed via a disk revolution servo control part 16a. Then the controller 14 returns a pickup 12 to its position set before the track jump occurred. Meanwhile a shock-proof memory controller 22 reads continuously the data out of a shock-proof memory 21 in order to prevent the break of sounds. When the pickup 12 is returned to the preceding position, the controller 14 gradually increases the number of clocks and reads the data out of a disk while changing the linear velocity up to an n-fold level from a low speed. At the same time, the controller 22 writes the relevant data into the memory 21 in the variable velocities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a playing method of a disc player, and more particularly to a playing method of a disc in which sound is not interrupted even when a track jump occurs.

[0002]

2. Description of the Related Art In a disc player such as a CD or a video disc, a tracking error signal is generated according to a deviation between a beam spot position and a track, and the error is generated.
The signal is used to perform servo control to position the beam spot just above the track, and the spot is made to follow the track correctly according to the rotation of the disk. By the way, in a disc player, a pickup (beam spot) may jump over some tracks due to vibration. Particularly, a vehicle-mounted disc player is subject to frequent vehicle jumps because of vibration of the vehicle.

When such a track jump occurs, if nothing is done, the play is restarted from the place where the jump occurs, and a sound skip occurs, which is not preferable. Therefore, conventionally, when a track jump occurs, the audio output is muted to return the beam spot to the position before the jump, and the performance is restarted from the jump occurrence position. That is, conventionally, absolute time information (total elapsed time) obtained from the subcode Q information is monitored, the occurrence of a track jump is detected based on the discontinuity of the elapsed time, and the track jump is detected. The audio output is muted, and then the beam spot is returned to the jump start position by using the absolute time information at the jump start position, the mute is canceled and the performance is restarted. ..

However, when a track jump occurs,
Since the mute is applied from the jump destination to the position before the jump, the sound is cut off for a long time of about 1 to 2 seconds during this time, which gives the listener uncomfortable feeling. For this reason, the disk is controlled to rotate at n times (for example, twice) the normal linear speed, and the data recorded on the disk is intermittently read at the n times speed and written to the memory, and the memory is written in parallel with the writing. To play the disc by reading the data at the normal reading speed from
When a track jump occurs during the performance of such a disc, the pickup is returned to the jump source while continuing to read the data from the memory, thereafter the data is read from the disc at n times speed, and the read data is written in the memory. A playing method has been proposed.

According to the proposed method, even if a track jump occurs, the data is read from the shock proof memory and the performance is continued, so that skipping or interruption of sound does not occur and the listener feels uncomfortable. Never give. The shockproof memory has Tm seconds (for example, 2.
Since data can be stored (recorded) for about 8 seconds, even if a track jump occurs, if the pickup returns to the jump source within this maximum recording time Tm seconds, in other words, the time required to return to the jump source. And Tm> Tj, the n-fold speed data reproduction / writing is performed again after returning to the jump source, so that skipping or interruption of sound does not occur.

[0006]

By the way, there is a case where the disk rotation servo is disengaged at the same time as the track jump due to a large vibration. When such a servo deviation occurs, the disk rotation servo is controlled so as to lock at the n-fold speed thereafter, the pickup is returned to the position before the jump occurs after the lock, the data is read from the disk at the n-fold speed and stored in the memory. Write at double speed.

However, when the disk rotation servo is disengaged, the disk rotation speed is decelerated to a low speed, and it takes a long time to lock the servo from the low speed to the n-fold speed. Therefore, until the servo locks at n times speed and the pickup returns to the position before the jump occurs, all the data stored in the memory will be read, and until the new data is written in the memory There is a problem that cuts occur.

From the above, the object of the present invention is to prevent the disk rotation servo from being disengaged with the track jump due to vibration.
Servo lock is performed in a short time, the pickup can be returned to the position before the jump occurs until all data is read from the memory, and data writing to the memory can be started. It is to provide a playing method.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the above object is to intermittently write data recorded on a disk at an n-fold speed or a variable speed, and to store data in parallel with the writing. Shock proof memory read at round speed, a means for detecting the disc rotation servo disengagement, and when the disc rotation servo is disengaged, the linear velocity is set to a low speed of n times the speed or less to lock the disc rotation servo and the rotation servo. After locking, return the pickup to the position before the jump occurred, and change the linear velocity from the low velocity to n.
This is achieved by means for controlling the shift to double speed and means for writing the data read from the disk to the shock proof memory according to the reading speed from the disk and reading the data from the shock proof memory at the normal speed.

[0010]

The disk is controlled to rotate at n times the normal linear speed, the data recorded on the disk is intermittently read at the n times speed and written to the memory, and the normal reading speed from the memory is read in parallel with the writing. The disc is played by reading the data and converting it to DA. During the performance, when the rotation servo of the disk comes off along with the track jump due to the vibration, the data reading from the memory is continued and the linear speed is set to a low speed of n times the speed or less to lock the disk rotation servo to perform the servo lock. After that, return the pickup to the position before the jump occurred,
After that, the data is read from the disc and the shock proof memory is written while controlling the linear velocity from the low velocity to the n-fold velocity.

With this arrangement, even if the disk rotation servo is disengaged with the track jump due to vibration, the servo lock can be achieved in a short time. Therefore, the pickup can be moved to the position before the jump occurs before all the data is read from the memory. You can start writing data to the memory by returning to the

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Overall Structure FIG. 1 is a structural diagram of an embodiment in which the present invention is applied to a CD player. In the figure, 11 is a compact disc, 12 is a pickup, 13 is a digital signal processing circuit, 14 is a system controller, 15 is an operation panel, 16 is various servo circuits, and 17 is a compact disc (CD) which is a normal disc.
A spindle motor for rotating at a double linear velocity, a DR 21 in which data is written at a double velocity or a variable velocity, and stored data is read at a normal velocity in parallel with the writing.
AM-structured shock-proof memory, 22 is a microcomputer-structured shock-proof memory controller, and 23 is DA.
It is a converter.

In the program area of the compact disc 11, along with the acoustic data, a predetermined number of data (1 frame)
A frame synchronization signal and control data called a subcode are recorded for each. Depending on the Q channel of the subcode, (1) the song number according to the current position of the pickup, (2) the index (which indicates the movement of the song, etc.),
(3) Elapsed time from the beginning of the track number (performance time: minutes and seconds)
And information on what frame the pickup is on,
(4) The absolute elapsed time from the initial position of the pickup is instructed and appropriately displayed on the display unit of the operation panel 15.

The pickup 12 optically reads the digital information recorded on the compact disc 11 and inputs it to the digital signal processing circuit 13 through an RF amplifier and a waveform shaping circuit (not shown). In a normal state, the compact disc is controlled to rotate at a linear velocity n times (for example, twice) the normal rotation speed, so that the pickup reads digital data at a speed twice that of a normal CD player (double speed). Playback). Also, when the servo comes off,
Compact disc 11 has low speed (eg, 1/2 speed)
Since variable speed control is continuously performed up to double speed, digital data is read at a variable speed during this variable speed control period.

The digital signal processing circuit 13 performs error detection / correction processing on the input digital information and inputs it to the shock proof memory controller 22, and separates the sub code and inputs it to the system controller 14.
Further, in the digital signal processing circuit, the synchronization signal generator 13a
A clock generator 13b is provided to control the generation of the synchronization signal SYS and the clock CL.

The system controller 14 is composed of a microcomputer, and displays the music number, the elapsed time for each song, the elapsed time of the total, etc. on the display section of the operation panel 15 based on the subcode Q channel data. , Access to the desired music number is performed based on the information input from the operation panel, and further, (1) track jump detection, (2) pickup return control to the position before jump occurrence, (3) Pause control, (4) Focus servo return control, (5) Clock frequency change instruction, that is, disk linear velocity variable instruction, (6) Shockproof memory controller 22
Control data exchange with

The servo circuit 16 performs known tracking servo, focus servo, CLV control (disk rotation servo) for keeping the linear velocity constant, pickup feed servo, and the like. By the disc rotation servo control, the disc is controlled to rotate at n times, for example, twice the normal linear velocity under normal conditions, but when the rotation servo is deviated, it is a low speed of 2 times or less (for example, a linear velocity of 1/2 of normal) The rotation is controlled so as to lock with, and the linear velocity is variably controlled up to double speed after locking at the low speed. Reference numeral 16a is a disk rotation servo control unit, 16b is a focus servo control unit, and 16a-6 is a servo deviation detection unit provided in the focus servo control unit.

The shock proof memory 21 is composed of a DRAM and has a capacity capable of storing data having a length of about 2.8 seconds.
With the above control, the data is written at the double speed or the variable speed of the normal speed, and the data is read at the normal speed.

Shockproof memory controller 22
Controls the writing / reading of data to / from the shockproof memory 21. For example, (1) it is monitored whether or not there is a notification of the occurrence of a track jump from the system controller 14, and when the track jump occurs, writing to the memory 21 is stopped (reading is continued).
Further, (2) it is monitored whether the shock proof memory 21 is full of data (data full), and when the data is full, the system controller 14 is notified of the data full, and writing to the memory is stopped (reading is not performed). continue). Then, the reading is continued, and when a predetermined number of data is read and a vacancy is generated, the fact is notified to the system controller 14, and the writing of the data input from the digital signal processing circuit 13 is restarted. Further, (3) at the time of writing the data to the shock proof memory 21, the data is written based on the clock signal CL input from the digital signal processing unit 13, whereby the normal speed double writing is performed in the shock proof memory 21. When the servo goes off, the data is written to the shock proof memory at a variable speed.

The sync signal generator synchronization signal generating section provided in the digital signal processor 13, as shown in FIG. 2, a synchronization signal detection circuit 13a-1, a pseudo synchronizing signal generator 13a-2, switcher It is composed of 13a-3. The sync signal detection circuit 13a-1 receives the frame sync signal SY from the EFM signal output from the RF amplifier (not shown).
S'is extracted and output, and at the same time, a sync detection signal SDT which becomes a high level when the frame sync signal is detected is output.

The synchronizing signal SYS 'is used when the rotational linear velocity of the disk is within a few percent of the prescribed linear velocity (when the servo is locked).
It can only be played, and nothing else. In the servo lock state, the disk rotation servo control unit 16a uses the frame synchronization signal SYS 'to control the constant linear velocity (C
LV constant control) is performed. However, when the servo is not locked, that is, the servo is lost (servo unlock)
At times, since the frame synchronization signal SYS 'cannot be reproduced from the EFM signal, the pseudo synchronization signal generation unit 13a-2 generates the pseudo synchronization signal SYS'', and the disk rotation servo control unit 1
6a uses this pseudo-synchronization signal SYS ″ to bring the rotational speed of the disk within the range of several% of the prescribed linear velocity. The pseudo-synchronization signal generation unit 13a-2 detects a pulse of the shortest 3T or the longest 11T from the EFM signal. Shortest / longest pulse detector P
(588/3) times from DT and the shortest or longest pulse length or
It has a pseudo sync signal generator FSG that multiplies (588/11) times to generate a pseudo sync signal SYS ″. One frame is composed of 588T. The switch 13a-3 is in the servo unlock state. At (the sync detection signal SDT is at a low level),
The pseudo sync signal SYS ″ is changed to the sync signal SYS ′ in the servo lock state (the sync detection signal SDT is at a high level).
Are output to the disk rotation servo control unit 16a as frame synchronization signals SYS.

The clock generator 1 provided with a clock generator digital signal processing unit 13
As shown in FIG. 3, 3b includes a crystal oscillator 13b-1, a variable voltage oscillator (VCO) 13b-2, and a switch 13b-3. The crystal oscillator 13b-1 generates a clock signal CL1 having a constant frequency (see FIG. 4 (b)) corresponding to the double speed, and the variable voltage oscillator (VCO) 13b-2 (1) operates at a low speed when the servo goes out ( Clock signal CL2 having a frequency corresponding to (1/2 speed)
(2) After the servo locks at low speed, the frequency gradually increases (see FIG. 4 (a)) and the clock signal CL2 is generated, and the switching device 13b-3 locks the servo at double speed. Sometimes, the clock signal CL1 from the crystal oscillator 13b-1 is output, and when the servo is unlocked, the clock signal CL2 from the voltage variable oscillator (VCO) 13b-2 is output (see FIG. 4 (c)). ..

When the servo is locked at the double speed, the system controller 14 controls the switch 13b-3 to output the clock signal CL1 from the crystal oscillator 13b-1 having a constant frequency according to the double speed. Further, when the servo deviation is detected at the double speed (time t ₀ ), the low voltage signal VL is input to the variable voltage oscillator (VCO) 13b-2 to input 1 /
It oscillates at a low speed according to the double speed and switches 13b-
3 is controlled to output the clock signal CL2 from the voltage variable oscillator (VCO) 13b-2. When the disk rotation servo locks at a low linear velocity at time t ₁ ,
After that, when the voltage signal VL having a linearly increasing voltage value is input to the variable voltage oscillator (VCO) 13b-2 to gradually increase the frequency of the clock signal CL2 to the double speed, when the frequency becomes the frequency corresponding to the double speed. At (time t ₂ ), the switch 13b-3 is controlled to output the clock signal CL1 from the crystal oscillator 13b-1, and the clock signal CL shown in FIG. 4 (c) is output as a whole.

As shown in FIG. 5, the disk rotation servo control section 16a provided in the disk rotation servo control section servo circuit 16 has a linear velocity constant circuit (C
LV circuit) 16a-1, an addition circuit 16a-2, and a spindle motor drive circuit 16a-3. The CLV circuit 16a-1 outputs a voltage signal Vf corresponding to the frame sync signal SYS output from the sync signal generator 13a (FIG. 2) f / V
It has a converter FVC and a phase comparator PHC which outputs a voltage signal Vp according to the phase difference between the frame synchronizing signal SYS and the signal CL 'obtained by dividing the frequency of the clock signal from the clock generator 13b (FIG. 3). There is. The adder circuit 16a-1 adds the voltage signal Vf and the voltage signal Vp and inputs them to the spindle motor drive circuit 16a-3 to drive the spindle motor 17.
When the frequency of the clock signal CL is changed, the output of the phase difference comparator PHC changes, and the disk is controlled so as to rotate at a linear velocity according to the clock frequency.

The focus servo control section 16b provided in the focus servo control section servo circuit 16 is, as shown in FIG.
16b-1, a focus error signal detection circuit 16b-2, a focus search signal generation section 16b-3, a focus servo circuit 16b-4, a focus drive circuit 16b-5 and a servo deviation detection section 16b-6. There is. The waveform of each part is shown in FIG.

The near focus detection circuit 16b-1 compares the combined signal FOK '(see FIG. 7) obtained by combining the detector outputs of the four-division type photodetector 12b in the pickup 12 with the slice level Vs, and combines them. When the signal FOK 'is equal to or higher than the slice level Vs, it is assumed that the objective lens 12a has reached near the in-focus point and the focus servo enable signal FOK is obtained.
To occur. The focus error signal detection circuit 16b-2 is
Focus error signal FE according to the distance between the objective lens and the focal point using the output signal of the four-division photodetector 12b
(See FIG. 7) is generated. Focus search signal generator 1
6b-3 generates a focus search signal FS for moving the objective lens 12a to a position where the focus servo is applied after the compact disc is mounted or when the focus servo is removed. The focus servo circuit 16b-4 operates when the focus servo is off (FOK = ”
0 "), the focus search signal FS is output, and when the focus servo is locked (FOK =" 1 "), the focus error signal FE is output to perform the focus servo. The focus drive circuit 16b-5 is operated by the focus servo circuit. An actuator (not shown) is driven on the basis of the output signal, and the servo deviation detection unit 16b-6 outputs a focus servo deviation signal FSUL to the system controller 14 based on "1" and "0" of the servo enable signal FOK. Hereinafter, the entire operation of the present invention will be described separately for the system controller and the shock proof memory controller.

Processing of System Controller FIG. 8 is a flow chart of processing of the system controller 14 in the present invention. When there is a performance instruction from the operation panel or 15, the system controller 14 issues a command to the servo circuit 16 to start various servos. As a result, the spindle motor 17 rotates the compact disc 11 at a linear velocity twice the normal speed, and the pickup 12 reads digital data from the compact disc at a double velocity. The digital signal processing circuit 13 performs error detection / correction processing on the input digital information, and then inputs it to the shock proof memory controller 22 together with the clock CL, and also separates the subcode and inputs it to the system controller 14 (above). , Step 101). The crystal oscillator 13b-1 (Fig. 3
The fixed clock signal CL1 corresponding to the double speed output from the reference unit) is output to each unit as the clock CL.

In parallel with the above operation, the system controller 14 uses the subcode Q to check whether a track jump has occurred (step 102). The system controller 14 can monitor the absolute time information (total elapsed time) obtained from the subcode Q information and detect the occurrence of a track jump based on the discontinuity of the elapsed time.

If no track jump has occurred,
It is checked whether or not the shock proof memory controller 22 receives a notification (data full signal) that the shock proof memory 21 is full of data (step 103).

If the data full signal has not been received, in other words, if the data is not full, the processing from step 101 onward is continued. If the data is full, an instruction is given to each section and C
Temporarily stop double speed reading of data from D (pause state). In the paused state, the rotation of the spindle motor 17 is not stopped, and absolute time information at the pause start position is stored so that the pickup is moved to the position indicated by the absolute time information every time the pickup moves for a predetermined time or more. The returning operation is repeated to maintain the pickup at the pause start position (step 104 above).

Thereafter, it is monitored whether or not a data empty signal is received from the shock proof memory controller 22 (step 105). If it is not received, the pause state is continued, and if it is received, the pause state is released and the process returns to step 101 and thereafter. The process of is repeated. Incidentally, when a predetermined number of data are read from the shock proof memory 21 after the data is full and an appropriate size of free space is made in the memory, the shock proof memory controller 22 sends a data free signal to the system controller 14.

The above is the case where the track jump has not occurred, but if the track jump has occurred, "YES" is determined in the step 102. As a result, the system controller 14 notifies the shock proof memory controller 22 of the occurrence of the track jump (step 10).
6). Then, it is checked whether or not the focus servo is out by referring to the focus servo out signal ESUL output from the focus servo control unit 16b (step 107). When the focus servo is off, the signal is in a non-signal state, and the disk rotation servo with a constant linear velocity is also off, and the servo cannot be performed.

When the focus servo is not out, the disk rotation servo is also out and the signal can be read correctly. Therefore, the return control for moving the pickup to the position is performed using the absolute time information at the position before the jump occurs (steps 108 and 109).

When the pickup returns to the jump source, the system controller 14 notifies the shock proof memory controller 22 of the return (step 11).
0) Then, it is checked whether the flag Ff (initial value is "0") indicating occurrence of servo deviation is "1" (step 111), and "N"
If it is "O", the process returns to step 101 to continue the subsequent processing.

The above is the case where the servo deviation has not occurred, but when the servo deviation has occurred, since "YES" is determined in step 107, the flag Ff is set to "1" and the occurrence of the servo deviation is stored ( Step 112), and then the focus servo control unit 16b (FIG. 6) is executed to execute the focus servo return control (steps 113 and 11).
4). When the focus servo is enabled, the clock CL output from the clock generation unit 13b is set to a low frequency and output to each unit, which causes the disk rotation servo control unit 16a to perform servo lock at a linear velocity of 1/2 of the normal speed. Control is performed (step 115).

Thereafter, the frame sync signal is detected by the sync signal detector.
It is checked whether it is detected by 13a-1 (FIG. 2) (step 116). Since the linear velocity is low, the servo signal can be locked in a short time to detect the synchronization signal. If the frame synchronization signal is detected, the pickup return control is performed thereafter (steps 108 and 109), and if the pickup returns to the jump source, the shock proof memory controller 22 is notified of the return (step 110), and then the servo It is checked whether the flag Ff indicating the occurrence of disconnection is "1" (step 111).

In this case, since Ff = “1”, Ff
Is reset to "0" and the fact that the servo is locked is stored (step 121). Next, the system controller 14 controls the clock generator 13b to gradually increase the system clock CL to a frequency corresponding to the double speed. As a result, the linear velocity is gradually increased to double speed while the servo is locked, the data is read from the disc by the shift, and the digital signal processing unit 13 inputs the data and the clock whose frequency is gradually increased to the shock proof memory controller 22 (step 122, 123). As a result, the shock proof memory controller 22 writes the data read from the disk in the shock proof memory 21 using the clock CL whose frequency gradually increases.

When the speed becomes double, the clock CL is fixed to the clock signal CL1 output from the crystal oscillator 13b-1 (step 124), the process returns to step 101, and the subsequent processing is continued. Whether or not the speed is doubled is determined based on the control time.

Shockproof memory controller
The physical view 10 is a flow diagram of the processing of the shock-proof memory controller. When the data and the clock CL are received from the digital signal processing circuit 13 by the start of the performance (step 201), the shock proof memory controller 22 writes the data in the shock proof memory 21 in synchronization with the clock CL. Therefore, if the clock has a frequency corresponding to the double speed, the double speed writing is performed, and if the clock changes from the low speed to the double speed, the writing speed changes (step 202).

In parallel with the above write control, the shock proof memory controller 22 reads from the shock proof memory 21 at a normal speed (normal speed).
Then, the read data is input to the DA converter 23 (step 203).

Further, the jump occurrence returning flag Fj is set to "
1 ", in other words, it is checked whether a track jump has occurred and the pickup is being returned (step 204).
System controller 1 when a track jump occurs
Since there is a jump occurrence notification from 4, the shock proof memory controller 22 sets the jean occurrence flag Fj (initial value is "0") to "1". In addition, when the return of the pickup to the jump source is completed, the system controller 1
Since there is a return notification from 4, the jump occurrence returning flag Fj is returned to "0". That is, Fj = "1" from the occurrence of the jump to the completion of the return.

If Fj = "1" is not satisfied, it is checked whether or not the shock proof memory 21 is full of data (data full) (step 205). If not, it is checked whether the data full flag Fd is "1". (Step 2
06), if not "1", the process returns to step 201 and the subsequent processing is repeated. The data full flag Fd (initial value)
"0") becomes "1" when the shock proof memory 21 becomes full of data, and when a predetermined number of data is read out after the data becomes full and the shock proof memory has a predetermined empty space, "" Returned to 0 ".

If a track jump has occurred and the jump generation returning flag Fj is "1", then "YES" is determined in the step 204. As a result, the process jumps to step 203, and thereafter, until the return of the pickup to the jump generation source is completed (until Fj = “0”), the data is not written to the shock proof memory 21 and only the data is read. To do. Then, when the return of the pickup to the jump generation source is completed, Fj = "0" is set, and thereafter, shift → double speed writing and normal reading are performed in parallel.

On the other hand, if the shock proof memory 21 is full of data, "YES" is determined in the step 205. As a result, the data full flag Fd is set to "1" (step 207) and the data full signal is sent to the system controller 14 (step 208). After that, the process jumps to step 203, and the shockproof memory 21 is kept until a predetermined amount of free space is made in the memory (until Fd = 0).
Stop writing data to. Incidentally, step 203
At, normal reading of data from the shock proof memory 21 is continued.

When the data is read out after the data is full and the writing is stopped, the data is not full, but the data full flag Fd = "1".
The write stop is not released immediately. That is, even if the data is no longer full and “NO” is obtained in step 205, since Fd = “1”, “YE” is obtained in step 206.
S ”, and it is checked in step 209 whether or not a predetermined amount of free space has occurred in the shock proof memory 21, and if there is no predetermined amount of free space, the process jumps to step 203 and writing of data to the memory is still stopped.

However, if there is a predetermined amount of free space in the shock proof memory 21, "YES" in step 209.
Therefore, the data full flag Fd is returned to "0" (step 210), a data empty signal is sent to the system controller 14 (step 211), and then the process returns to step 201 to perform double speed writing and normal reading of data. To do.

In the above, the shock proof memory 21 is used.
I explained the case of writing data without compressing to,
It may be configured such that data compression is performed by the ADPCM method or another method, the data is written in the shock proof memory, and the original data is restored at the time of reading. that's all,
Although the present invention has been described with reference to the embodiments, the present invention can be modified in various ways according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0048]

As described above, according to the present invention, when the rotary servo of the disk comes off along with the track jump, the linear velocity becomes n.
The disk rotation servo is locked at a low speed equal to or lower than double speed, and after the rotation servo lock, the pickup is returned to the position before the jump occurs, and the linear speed is variably controlled from the low speed to the n-fold speed to read the data from the disk. Since the read data is written to the shock proof memory according to the reading speed from the disc, even if the disc rotation servo is disengaged with the track jump due to vibration, the servo lock can be performed in a short time, and therefore all the data can be recorded. By the time when is read from the memory, the pickup can be returned to the position before the jump occurs, and the writing of data to the memory can be started, and the occurrence of sound interruption can be prevented.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a synchronization signal generator of the present invention.

FIG. 3 is a configuration diagram of a clock generation unit of the present invention.

FIG. 4 is an operation explanatory diagram of a clock generation unit.

FIG. 5 is a block diagram data of a disk rotation servo control unit.

FIG. 6 is a configuration diagram of a focus servo control unit.

FIG. 7 is a waveform chart of each part of the focus servo.

FIG. 8 is a first flow chart of system controller processing.

FIG. 9 is a second flow chart of system controller processing.

FIG. 10 is a flow chart of processing of a shock proof memory controller.

[Explanation of symbols]

 12-Pickup 13-Digital signal processing circuit 13a-Synchronization signal generation unit 13b-Clock generation unit 14-System controller 16-Servo circuit 16a-Disk rotation servo control unit 16b-Focus servo control unit 16b -6 .. Servo deviation detection unit 21. Shockproof memory 22. Shockproof memory controller 23. DA converter

Claims (1)

[Claims] 1. A disk is controlled to rotate at n times the normal linear speed, data recorded on the disk is read intermittently at an n times speed and written to a memory, and in parallel with the writing, a normal operation is performed from the memory. When the disc is played by reading the data at the reading speed and performing DA conversion, and when a track jump occurs during the performance of the disc, the pickup is returned to the jump source while continuing to read the data from the memory, and then n times speed. In the playing method of the disc player, which reads the data from the disc and writes the read data to the memory, when the rotation servo of the disc deviates with the track jump, the linear velocity is set to a low speed equal to or lower than the n-fold speed and the disc rotation servo is locked. After the rotation servo lock, move the pickup to the position before the jump occurs. In addition, the data is read from the disc while the linear velocity is variably controlled from the low velocity to the n-fold velocity, and the read data is written in the shock proof memory according to the reading velocity from the disc. Method.