JP2000322833A - Multi-track disk-reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up a data transfer rate without changing a rotational speed of an information disk by jumping a read track of a reproducing means after reading data of one rotation, advancing the reproducing means by a fixed amount and resetting the read track to a proper position when an abnormal track jumping is brought about. SOLUTION: A reproducing means is moved to overlap a plurality of optical pickups 7a with an already read track, and started reading immediately after moved. When an abnormal track jumping is brought about by vibrations or the like, track jumping is carried out again in the same manner as after data of one rotation of a disk is finished to be reproduced, thereby reading the rest of the read data. The track is jumped to a proper position so that only aligned data in a data alignment memory is left, and data of a plurality of tracks which are interrupted in reading in the halfway is discarded, thereby reading from the rest of the aligned data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention performs high-speed data transfer by reading a plurality of tracks at the same time, and prevents interruption of read data such as audio data and video data, particularly when vibration or shock is applied. The present invention relates to a multi-track disc reproducing apparatus described above.

[0002]

2. Description of the Related Art A compact disk (hereinafter abbreviated as CD) used in a disk reproducing apparatus includes music data (PCM data) and control data in a track (pit train).
Is recorded in a spiral form from the inner peripheral side to the outer peripheral side. In addition, reading of the recording signal of this CD is as follows.
Tracking is performed by tracking a track with an optical pickup. Tracking of runout is mainly performed by a tracking servo, and tracking of track progress is mainly performed by a thread servo.

When a large vibration or impact is applied to a disk reproducing apparatus for reproducing the CD, a track jump occurs without being able to cope with the above-described tracking servo. . Such interruptions or skips can be prevented by providing a shock-proof memory. The disk reproducing apparatus having the shock proof memory reads out the data recorded on the CD at a high speed (for example, at a double speed), performs predetermined signal processing, writes the data into the shock proof memory, and writes the data from the shock proof memory. Reading and playing music. Generally, the speed at which data is written to the shock proof memory is set faster than the speed at which data is read, so that a certain amount or more of data is stored in the shock proof memory. Even when data cannot be read, data can be read from the shock proof memory at a constant speed.

However, in the above-described system in which high-speed data reading from a CD and data writing to a shock-proof memory are intermittently performed according to the amount of stored data, when the high-speed data reading from the CD is resumed, Since it is necessary to adjust the pickup to the address position at the time of interrupting the data reading, a search operation is necessarily performed. Since this search operation is performed by canceling the tracking servo, the vibration resistance is significantly deteriorated. If continuous vibration is applied during the search operation, the position in the tracking direction is not determined, and the search may take time. Therefore, all data stored in the shock-proof memory may be read before resuming data reading from the compact disk. Cuts and skips will occur.

[0005] To cope with the above-mentioned problem, a disk reproducing apparatus described in Japanese Patent Application Laid-Open No. H10-112124 is generally known. This disk reproducing apparatus reproduces music by temporarily writing and storing music data read from a disk-type recording medium in a temporary storage means, and then reading out the music data. Music data is written to the temporary storage means at a speed higher than the music playback speed until the data reaches a predetermined amount, and is substantially the same as the music playback speed after the data before reading stored in the temporary storage means reaches a predetermined amount. The music data is written to the temporary storage means at a speed.

[0006]

However, in the above-described disk reproducing apparatus disclosed in JP-A-10-112124, the rotational speed of the disk is changed before and after the data before reading stored in the temporary storage means reaches a predetermined amount. When changing the reproduction speed of the disk rapidly, there is a problem that the error rate of the read data is deteriorated due to the deterioration of the quality of the read signal and the problem of the following performance of the PLL.

Further, while music data is being written to the temporary storage means at substantially the same speed as the music reproduction speed, data cannot be read for a certain period of time due to continuous vibration or the like, and the data is stored in the temporary storage means. If the amount of data before reading decreases rapidly, the disk rotation speed must be increased, and while the rotation speed is being changed, the data error rate deteriorates and the disk rotation speed increases for the above-described reason. Because it takes some time
It takes more time to restore the reduced amount of data stored in the temporary storage unit before reading, and furthermore, if data cannot be read due to vibration or the like, sound skips. Problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk reproducing apparatus which has improved vibration resistance against continuous vibrations or the like and prevents sound breaks or skips.

[0009]

SUMMARY OF THE INVENTION A multi-track disk reproducing apparatus according to the present invention reads in parallel data on a plurality of adjacent tracks of an information disk having a plurality of tracks formed concentrically or spirally on a recording surface. Reproduction means,
A data aligning unit for sequentially storing data reproduced by the reproducing unit and arranging the data in a track arrangement order; and a data aligning unit at a speed lower than a sum of data reading speeds from a plurality of tracks which can be read in parallel by the reproducing unit. A memory reading means for reading aligned data from the means, and data from the reproducing means being written to the data aligning means in parallel with reading of the aligned data by the data aligning means, and data for one revolution of the information disk. And control means for causing the read track of the reproducing means to make a track jump and advance forward by a fixed amount, and for controlling occurrence of an abnormal track jump to reset the read track of the reproducing means to an appropriate position. .

According to the present invention, it is possible to provide a disk reproducing apparatus capable of further improving the vibration resistance against continuous vibration and the like and preventing sound breaks and skips.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, data of a plurality of adjacent tracks of an information disk having a plurality of tracks formed concentrically or spirally on a recording surface are read in parallel. A reproducing unit; a data aligning unit for sequentially storing data reproduced by the reproducing unit and arranging the data in a track order; and a speed lower than a sum of data reading speeds from a plurality of tracks that can be read in parallel by the reproducing unit. A data reading means for reading the sorted data from the data sorting means, and writing the data from the reproducing means to the data sorting means in parallel with the reading of the sorted data by the data sorting means. When the data for the rotation is read, the reading track of the reproducing means is caused to jump by a predetermined amount and is moved forward by a certain amount. A multi-track disc reproducing apparatus provided with control means for resetting a read track of the reproducing means to an appropriate position when an abnormal track jump occurs, so that data can be read without changing the rotation speed of the information disc. Since the transfer speed can be increased and the data alignment means can be used as a memory for shock proofing, the total memory amount of the reproducing apparatus can be kept to the minimum, and even if the data in the data alignment means decreases. The data in the data alignment means can be quickly increased, and the shock proof can be realized with the information disk kept at a low rotation speed. It is possible to provide a disk reproducing device in which jumping is prevented.

According to a second aspect of the present invention, the information disk is a disk in which a plurality of tracks are formed in a spiral shape, and the control means performs a track jump when the read track is advanced and an abnormal track jump occurs. 2. The multi-function device according to claim 1, wherein a track jump is performed so that a part of the reproducing means overlaps with the already read track, and data reading is immediately resumed using the reproducing means corresponding to the unread track. This is a track disk reproducing device, and the data reading is immediately resumed even after the track jump. Therefore, even if the data in the data aligning means decreases, the data in the data aligning means can be quickly increased. , A disk with improved vibration resistance against continuous vibrations, etc., to prevent interruption of output data It is possible to provide a raw device.

According to a third aspect of the present invention, when the data storage amount of the data alignment means is equal to or more than a predetermined value, the control means sets the number of tracks to be read in parallel by the reproduction means to one, and 3. The multi-track disc reproducing apparatus according to claim 1, wherein the number of tracks read in parallel by said reproducing means is increased when said data storage amount becomes equal to or less than a predetermined value. Since the speed at which data is written to the data alignment means can be changed immediately without changing the speed, the error rate of the read data does not deteriorate, and even when the data in the data alignment means decreases, the data can be quickly changed. The data in the alignment means can be increased, the vibration resistance against continuous vibrations etc. is improved, and the interruption of output data is prevented. The disc reproducing apparatus can be provided.

According to a fourth aspect of the present invention, an effective reading is performed by increasing or decreasing the number of tracks written in parallel to the data alignment means among the data of the tracks read in parallel by the reproducing means. 4. A multi-track disk reproducing apparatus according to claim 3, wherein the number of tracks is increased or decreased, and the speed of writing data to said data alignment means can be changed immediately without changing the rotation speed of the disk. Therefore, there is no deterioration in the error rate of the read data, and even if the data in the data alignment means decreases, the data in the data alignment means can be increased quickly, and the vibration resistance against continuous vibration and the like is further improved. It is possible to provide a disk reproducing apparatus that prevents output data from being interrupted.

According to a fifth aspect of the present invention, the information disk is a disk in which tracks are formed in a spiral shape, and the control means controls the reproducing means in parallel with a plurality of tracks which are reproduced in parallel. When the reproducing speed is substantially the same as the reading speed of the memory reading means, when the data storage amount of the data aligning means becomes a predetermined value or more, the reproducing means sets the number of tracks to be read in parallel to one and performs reproduction without performing a track jump. 5. The multi-track disc reproducing apparatus according to claim 3, wherein the speed of writing data to the data alignment means is changed immediately without changing the rotation speed of the disc. No error rate of read data is deteriorated, and even if data in data alignment means decreases, The data in the data aligning means can be increased, and when the data storage amount of the data aligning means becomes equal to or more than a predetermined value, the reproduction of the data without the track jump is performed at substantially the same reading speed as the memory reading means. Therefore, it is possible to provide a disk reproducing apparatus in which vibration resistance against continuous excitation or the like is further improved and output data is prevented from being interrupted.

According to a sixth aspect of the present invention, the information disk is a disk in which tracks are formed in a spiral shape, and the control means controls the reproducing means in parallel for a plurality of tracks to be reproduced per one track. When the reproducing speed is different from the reading speed of the memory reading means, when the data storage amount of the data alignment means becomes a predetermined value or more, the number of effective reproducing tracks is reduced to one and the reproducing speed per track is reduced by the memory reading means. 4. The method according to claim 3, wherein the read speed is changed to a speed substantially equal to the read speed, and when the data storage amount of the data aligning means becomes equal to or less than a predetermined value, the number of effective reproduction tracks is increased, and the reproduction speed per track is restored. A multi-track disc reproducing apparatus according to claim 4, wherein the disc rotating speed is not changed rapidly. Since the speed at which data is written to the data alignment means can be changed, the deterioration of the error rate of the read data is small, and even if the data in the data alignment means decreases, the data in the data alignment means can be quickly increased. Further, when the data storage amount of the data aligning means becomes equal to or more than a predetermined value, the data can be reproduced at substantially the same reading speed as the memory reading means without performing a track jump. Improve vibration resistance against vibration, etc.
It is possible to provide a disk reproducing device in which output data is prevented from being interrupted.

According to a seventh aspect of the present invention, the information disk is a disk on which digital audio data is recorded, and the memory reading means reads the digital audio data at a predetermined speed and reads the digital audio data. 7. The multi-track disk reproducing apparatus according to claim 1, further comprising a D / A converter circuit for converting audio data into an audio signal and outputting the audio signal. Since it can be used as a proofing memory, the total memory amount of the reproducing apparatus can be kept to the minimum, and even if the data in the data sorting means decreases, the data in the data sorting means can be increased quickly. It is possible to provide a disk playback device that has improved vibration resistance against continuous excitation and the like, and that prevents sound interruption and skipping. Kill.

Hereinafter, a multi-track disk reproducing apparatus according to the present invention will be described based on specific embodiments. (Embodiment 1) A multi-track disc reproducing apparatus according to Embodiment 1 of the present invention is, as shown in FIG. 1, adjacent to an information disc 1 having a plurality of tracks formed concentrically or spirally on a recording surface. A reproducing means 2 for reading data of a plurality of tracks in parallel, a data aligning means 3 for sequentially storing data reproduced by the reproducing means 2 and arranging the data in a track arrangement order, and a plurality of data readable by the reproducing means 2 in parallel. Data reading means 4 serving as a memory reading means for reading aligned data from the data aligning means 3 at a speed lower than the sum of the data reading speeds from the tracks, and reproduction in parallel with reading of the aligned data by the data aligning means 3 Data from means 2 to data sorting means 3
When the data for one rotation of the information disk 1 is read, the read track of the reproducing means 2 is track-jumped and advanced by a fixed amount, and when an abnormal track jump occurs, the read track of the reproducing means 2 is reset to an appropriate position. And control means 5 for performing such control.

Each component of the multi-track disc reproducing apparatus will be described more specifically. The information disk 1 includes, for example, an optical disk, a magnetic disk, and a magneto-optical disk. Here, the information disc 1 is an optical disc. The disk drive 6 is a motor that rotates the information disk 1 at a predetermined speed.

The reproducing means 2 comprises a read head section 7, a read head section driving device 8, a servo circuit 9, a head amplifier section 10, and a digital signal processing circuit 11. The read head unit 7 corresponds to, for example, an optical pickup in an optical disk device or a magneto-optical disk device.
The magnetic disk device corresponds to a magnetic head. Here, as shown in FIG. 2, the read head unit 7 has a configuration having a plurality of optical pickups 7a composed of a light emitting element and a light receiving element pair. The optical disc 7 is provided so as to be movable in the radial direction of the optical disc 7 and data of a plurality of tracks adjacent to the information disc 1 is read by a plurality of optical pickups 7.
The data is read and reproduced in parallel at a. FIG. 2 illustrates, for example, a state in which tracks T2 to T5 of a plurality of tracks T1 to Tn of the information disc 1 are read and reproduced simultaneously in parallel by four optical pickups 7a.

The read head unit driving device 8 drives the read head unit 7 in the radial direction to move to a target track. As shown in FIG. 2, the head amplifier unit 10 is configured by a plurality of head amplifiers so as to amplify signals reproduced in parallel from the reading head unit 7, convert the signals into signals of appropriate magnitude, and output the signals. .

As shown in FIG. 1, when the read head unit 7 is composed of the optical pickup 7a, the servo circuit 9 performs servo control of the optical pickup 7a in the focus and tracking directions. The digital signal processing circuit 11 converts a signal output in parallel from the head amplifier unit 10 into digital data, and demodulates and decodes the data if modulation or encoding is performed, and outputs the data in parallel.

The data aligning means 3 comprises a memory controller 13 for sequentially aligning the data output in parallel from the digital signal processing circuit 11 to the data aligning memory 12 in order from the beginning of the data. The data reading means 4 reads the data in the same order as the arrangement of the tracks on the information disk 1 at a speed lower than the total speed at which the data reproduced in parallel is reproduced, and outputs the data to the outside of the apparatus.

The control means 5 includes, for example, a central processing unit (C
PU) and the disk drive 6
A read head unit driving device 8, a servo circuit 9,
Digital signal processing circuit 11 and memory controller 13
And the data reading means 4 are controlled. Here, the actual reading operation of the multi-track disc reproducing apparatus will be described below.

The signals read in parallel from the read head unit 7 are converted into appropriate amplitudes by the head amplifier unit 10 and input to the digital signal processing circuit 11. The digital signal processing circuit 11 performs necessary processing such as conversion, demodulation, and decoding of a signal input in parallel into digital data, and outputs the digital data to the memory controller 13. Memory controller 1
Reference numeral 3 arranges the data output from the digital signal processing circuit 11 in the data arrangement memory 12 in the data arrangement order and temporarily stores the data. The data reading means 4 sequentially outputs the data in the data alignment memory 12.

After the data of one revolution of the information disk 1 has been reproduced, the read head unit driving device 8 and the servo circuit 9 are driven by the instruction of the control means 5 to advance the reproduction track. Since the disk 1 is rotating, when the information disk 1 has spiral tracks, the optical pickup 7a that reproduces the innermost reproduction track among the plurality of reproduction tracks has already been reproduced. It is difficult to move the playback means just to connect to the data.

Therefore, the plurality of optical pickups 7a preferably overlap the already-read track, so that the optical pickup 7 that reproduces the innermost track is preferably used.
The reproducing means 2 is moved so that a is moved to the outermost track among the read tracks, and reading is resumed immediately after the movement. The reproducing means 2 moved to the reproduced track may start reproduction as it is and compare it with the read data, or may unconditionally overwrite the read data, Alternatively, the reading operation or the data output operation may be stopped until unread data comes.

Also, when an abnormal track jump occurs due to vibration or the like, the track jump is performed again to read the continuation of the read data as in the case where the data of one rotation of the disk has been reproduced. Since the reading is interrupted in the course of one rotation of the track, only the data which has already been aligned in the data alignment memory 12 is left, and the data of the plurality of tracks in which the reading is interrupted in the middle is discarded. A track jump is performed to an appropriate position so as to read from the continuation of the already completed data. Alternatively, although the processing becomes complicated, the data reading for one rotation is completed when the data of the divided portion is read by using the data remaining after being divided in the data alignment memory 12. Is also good.

With this configuration, in the conventional disk reproducing apparatus, the read track is single, and the rotational speed of the disk is increased so that the data is read faster than the data reproducing speed. Must be read, the error rate of the read data deteriorates. However, in the multi-track disc reproducing apparatus of the first embodiment, the information disc 1
At a low rotational speed, a plurality of adjacent tracks are simultaneously read in parallel and stored in the data alignment memory 12, and can be read in the same order as the arrangement of the tracks on the information disk 1, thereby increasing the data transfer speed. Can be.

Further, since the data aligning means 3 can be used as a shock-proof memory, the total memory amount of the reproducing apparatus can be kept to the minimum, and the data reading can be restarted immediately after the track jump.
Even if the data inside the data aligning means 3 decreases, the data inside the data aligning means 3 can be quickly increased, and shock proof can be realized while keeping the information disk 1 at a low rotation speed. In addition, it is possible to provide a disk reproducing apparatus that can prevent the error rate of read data from deteriorating, improve the vibration resistance against continuous vibration and the like, and prevent interruption of output data.

(Embodiment 2) A multi-track disk reproducing apparatus according to Embodiment 2 of the present invention uses the control means 5 of Embodiment 1 described above when the data storage amount of the data aligning means 3 exceeds a predetermined value. The number of tracks to be read in parallel by the reproducing means 2 is set to one, and a function of increasing the number of tracks to be read in parallel by the reproducing means 2 when the data storage amount of the data aligning means 3 becomes a predetermined value or less is added. Things.

Here, the operation when the amount of data stored in the data alignment memory 12 becomes equal to or more than a certain value will be described. When the amount of data stored in the data alignment memory 12 exceeds a certain value, the data alignment memory 12
When the free space of the data becomes smaller, the read speed of the data read unit 4 is slower than the sum of the data read speeds of a plurality of tracks to be reproduced by the reproducer 2, so that the read data must be written into the data alignment memory 12. As a result, it is necessary to frequently perform a track jump and return the reproduction track. In addition, it is necessary to advance a reproduction track by performing a track jump every one rotation of a disk even in a disk having tracks formed in a spiral shape by an operation peculiar to a multi-track disk reproducing apparatus. Since the track jump is performed with the tracking servo released, the vibration resistance is significantly deteriorated.

Therefore, after the data amount stored in the data alignment memory 12 has reached a certain value or more, the reproduction means 2
By reducing the effective number of read tracks to one, the actual reproduction speed is reduced, and the reproduction can be advanced without performing a track jump for advancing the reproduction track unique to the multi-track disk reproducing apparatus. In this method, the reproduction speed can be changed more rapidly without changing the rotation speed of the information disk 1 as compared with the conventional method of changing the rotation speed of the disk. There is an advantage that there is no decrease in earthquake resistance or error rate when changing the value.

As a method for reducing the number of effective reading tracks of the reproducing means 2 by a method other than the method described above, a method of shutting off the signal output itself of the reading head unit 7 and a case where the reading head unit 7 is an optical pickup 7a A method of stopping the read beam itself, a method of stopping the output of the signal from the head amplifier unit 10, a method of stopping the operation of the digital signal processing circuit 11, or a method of storing the data of the corresponding track by the memory controller 13 in the data alignment memory There is a method that does not write to the 12.

Further, when the information disk 1 has spiral tracks, the reproduction speed per reproduction track is made substantially the same as the read speed of the data read means 4 and the number of simultaneously reproduced tracks is reduced. By setting the value to 1, reproduction can be performed without performing a track jump that deteriorates the seismic performance. At this time, the reproduction speed per track is faster than the reading speed of the data reading means 4 until the data amount in the data alignment memory 12 becomes a constant value. May be reduced to approximately the same speed as the reading speed of the data reading means 4 after the reading of the data reading means 4 has become constant, or the reading speed of the data reading means 4 may be read from the beginning. After the data amount in the data alignment memory 12 becomes a constant value so that the speed becomes almost the same, only the number of simultaneously reproduced tracks is reduced to one, and the disk capacity, which also deteriorates in seismic performance, is reduced. There is also a method without deceleration.

With the above configuration, the speed at which data is written to the data alignment means 3 can be changed immediately without changing the rotation speed of the information disk 1, so that the error rate of read data does not deteriorate. Even if the data inside the data sorting means 3 is reduced, the data inside the data sorting means 3 can be increased quickly, the vibration resistance against continuous vibrations and the like is further improved, and the disk in which the output data is not interrupted is prevented. A playback device can be provided.

(Embodiment 3) The multi-track disc reproducing apparatus according to the third embodiment of the present invention is different from the multi-track disc reproducing apparatus shown in FIG. CD-DA
The operation for reproducing (CD audio) data will be described below.

In the third embodiment, the information disk 1 is an optical disk of the CD / CD-ROM standard, in which tracks are spirally formed and data is recorded at a constant linear velocity. The disk drive 6 is a motor that rotates the information disk 1 at a predetermined speed. The reproducing means 2 comprises a read head unit 7, a read head unit driving device 8, a servo circuit 9, a head amplifier unit 10, and a digital signal processing circuit 11.

The read head unit 7 includes a CD / CD-RO
An optical pickup 7a that reads an M-standard disc is movably installed in the radial direction of the information disc 1, and reproduces data of a plurality of tracks adjacent to the information disc 1 in parallel. In the third embodiment, an optical pickup device capable of reproducing data of six tracks in parallel is used.

The reading head unit driving device 8 drives the reading head unit 7 in the radial direction to move to a target track. The servo circuit 9 performs servo control of the optical pickup 7a in the focus and tracking directions.
The head amplifier unit 10 is configured by a plurality of head amplifiers so as to amplify signals reproduced in parallel from the read head unit 7, convert the signals into signals of appropriate magnitude, and output the signals. The digital signal processing circuit 11 includes the head amplifier 1
Signals output in parallel from 0 are converted into digital data, and demodulation and decoding of CD / CD-ROM data are performed and output in parallel.

The data alignment means 3 comprises a memory controller 13 for sequentially aligning the data output in parallel from the digital signal processing circuit 11 to the data alignment memory 12 in order from the beginning of the data. The data reading means 4 reads data at a speed lower than the total speed at which the data reproduced in parallel is reproduced, and outputs the data to the outside of the device. The control unit 5 controls the disk drive unit 6, the read head unit drive unit 8, the servo circuit 9, the digital signal processing circuit 11, the memory controller 13, and the data read unit 4.

The actual reproduction operation will be described by taking, as an example, the case of reproducing CD-DA data and the change in the amount of data in the data alignment memory 12 and the actual reproduction speed. C
During D-DA playback, the rotation speed of the disk drive 2 is controlled so that the playback speed per track is equal to the standard playback speed of CD-DA. Therefore, the reproduction speed per track is 1 ×. At this time, the acceleration due to the disk rotation increases in proportion to the square of the speed as compared with the case where the information disk 1 is rotated at a high speed to perform high-speed reading, so that the seismic performance can be further enhanced.

The amount of data in the data alignment memory 12 and the actual reproduction speed change as shown in FIG. In the section A, data reading is performed using all six reproduction tracks until the data inside the data alignment memory 12 becomes a constant value. When the data of one revolution of the disk is read, a track jump is performed to advance the reproduction track. However, the track continues to rotate during the track jump, so that it is difficult to make a track jump so as to accurately connect to the read data. is there. For this reason, the innermost reproduction track needs to jump to the already read track, and the actual reproduction speed is about five times the standard speed.

The reproduction of the CD-DA data proceeds at a standard speed, and the data is read from the data reading means 4 at the speed of one reproduction track. Next, when the data in the data alignment memory 12 has a constant value, the number of simultaneously reproduced tracks is reduced to 1, but the rotation speed of the information disk 1 does not need to be changed, and the data reading speed is changed instantaneously. Can be done. In the section B, data is read at the same playback speed as that of the CD-DA data. At this time, the speed of reading data from the information disk 1 and the speed of reading data from the data reading means 4 are almost the same, so that the amount of data inside the data alignment memory 12 is constant. CD / CD-RO
In the M-standard disc, tracks are formed in a spiral shape. Therefore, it is not necessary to perform a track jump in this section.
In addition to the improved seismic resistance, there is no need to change the disk speed, so there is no reduction in seismic performance due to acceleration / deceleration of the disk. In addition, since the head amplifier unit 10 and the digital signal processing circuit 11 need only operate a circuit for one track, power consumption can be reduced.

Here, as shown in a section C, it is assumed that vibrations and the like are applied to the reproducing apparatus and data reading is temporarily stopped. In this section C, data cannot be read. However, since a fixed amount of read data is already stored in the data alignment memory 12, data from the data reading means 4 is not used until this data is lost. Data reading is not stopped, and interruption of the CD-DA sound can be prevented.

At the time when the vibration or the like is stopped and the data can be read again, the data in the data alignment memory 12 has decreased in the section C by the amount read by the data reading means 4. Data is read by increasing the number of simultaneously reproduced tracks. In the section D, the maximum six tracks are simultaneously reproduced, and the data is read again at about five times the standard speed until the data inside the data alignment memory 12 becomes a certain amount or more.

With the above configuration, the speed at which data is written to the data alignment means 3 can be changed immediately without changing the rotation speed of the information disk 1, so that the error rate of read data does not deteriorate. Even when the data inside the data sorting means 3 is reduced, the data inside the data sorting means 3 can be increased quickly, the vibration resistance against continuous vibration and the like is further improved, and the disc reproduction in which the output data is not interrupted is prevented. An apparatus can be provided.

[0048]

As described above, according to the multi-track disk reproducing apparatus of the present invention, data of a plurality of tracks adjacent to each other on an information disk having a plurality of tracks formed concentrically or spirally on a recording surface are parallelized. Reading means for reading and reading data from the plurality of tracks which can be read in parallel by the reproducing means; A memory reading means for reading the sorted data from the data sorting means at a slow speed; and writing the data from the reproducing means to the data sorting means in parallel with the reading of the sorted data by the data sorting means, When the data for one rotation of is read, the read track of the reproducing means is changed to the track jump Control means for controlling the read track of the reproducing means to reset to an appropriate position when an abnormal track jump occurs, thereby enabling data transfer without changing the rotation speed of the information disk. The speed can be increased, and the data alignment means can be used as a shock-proof memory, so that the total amount of memory in the playback device can be kept to a minimum. In addition, the data in the data alignment means can be increased, and the shock proof can be realized while keeping the information disk at a low rotation speed. Thus, it is possible to provide a disk reproducing apparatus in which the problem is prevented.

Further, the information disk is a disk having a plurality of tracks formed in a spiral shape, and the control means reads a part of the reproducing means when a track jump for moving the reading track forward or when an abnormal track jump occurs. In the case where the track jump is made so as to overlap the already-read track and the data reading is immediately resumed by using the reproducing means corresponding to the unread track, the data reading is immediately resumed even after the track jump. Even if the data in the data aligning means decreases, the data in the data aligning means can be increased promptly, the vibration resistance against continuous vibrations and the like is further improved, and a disk reproducing apparatus which prevents interruption of output data is provided. Can be provided.

Further, when the data storage amount of the data alignment means is equal to or more than a predetermined value, the control means sets the number of tracks to be read in parallel by the reproduction means to one, and the data storage amount of the data alignment means becomes less than the predetermined value. In the case where the number of tracks to be read in parallel by the reproducing means is increased, the speed of writing data to the data alignment means can be changed immediately without changing the rotation speed of the disk. The data rate in the data alignment means can be increased promptly even if the data in the data alignment means is reduced without deterioration of the error rate of the data, and the vibration resistance against continuous vibration and the like is further improved, and the output data is interrupted. Thus, it is possible to provide a disk reproducing apparatus in which the problem is prevented.

Further, the control means is arranged to increase or decrease the number of effective read tracks by increasing or decreasing the number of tracks written in parallel to the data alignment means among the data of the tracks read in parallel by the reproducing means. Thus, the speed at which data is written to the data alignment means can be changed immediately without changing the rotation speed of the disk, so that the error rate of the read data does not deteriorate and the data in the data alignment means decreases. However, it is possible to provide a disk reproducing apparatus in which the data in the data alignment means can be rapidly increased, the vibration resistance against continuous vibration or the like is further improved, and the interruption of output data is prevented.

Further, the information disk is a disk having tracks formed in a spiral shape, and the control means is configured such that the reproduction speed per track of a plurality of tracks to be reproduced in parallel by the reproduction means is the read speed of the memory read means. When the data storage amount of the data aligning means is equal to or more than a predetermined value, when the number of tracks read by the reproducing means is set to one and the reproduction is performed without performing the track jump, the information Since the speed at which data is written to the data alignment means can be changed immediately without changing the rotation speed of the disk, the error rate of the read data does not deteriorate, and even if the data in the data alignment means decreases, the data can be quickly changed. The data in the data sorting means can be increased, and the data storage of the data sorting means can be increased. Is larger than a predetermined value, data reproduction can be continued at substantially the same reading speed as the reading speed of the memory reading means without performing a track jump. It is possible to provide a disk reproducing apparatus in which interruption is prevented.

Further, the information disk is a disk in which tracks are formed in a spiral shape, and the control means is such that the reproduction speed per track of a plurality of tracks which are reproduced in parallel by the reproduction means is the read speed of the memory read means. If the data storage amount of the data alignment means is equal to or more than a predetermined value, the number of effective reproduction tracks is changed to one and the reproduction speed per track is changed to substantially the same as the read speed of the memory read means. When the data storage amount of the data alignment means is equal to or less than a predetermined value, the number of effective reproduction tracks is increased, and the rotation speed of the information disk is rapidly changed when the reproduction speed per track is restored. Since the speed at which data is written to the data alignment means can be changed immediately without any Less deterioration of the error rate, it is possible that the data in the data alignment unit increases the data in quickly the data alignment means even when reduced,
Further, when the data storage amount of the data alignment means becomes equal to or more than a predetermined value, data reproduction can be continued at substantially the same speed as the reading speed of the memory reading means without performing a track jump. Thus, it is possible to provide a disk reproducing apparatus that has improved performance and prevents interruption of output data.

Further, the information disk is a disk on which digital audio data is recorded, and the memory reading means reads the digital audio data at a predetermined speed and converts the read digital audio data into an audio signal. In the case where a D / A converter circuit for outputting data is provided, the data aligning means can be used as a memory for shock proof, so that the total memory amount of the reproducing apparatus can be kept to the minimum, and the data in the data aligning means can be reduced. Even in the case of a decrease, it is possible to quickly increase the data in the data alignment means, to provide a disk reproducing apparatus with improved vibration resistance against continuous vibration and the like, and to prevent sound cutoff and sound skipping.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a multi-track disc reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of a reproducing unit of the present invention.

FIG. 3 is a diagram showing a change in a data amount in a memory and a reproduction speed according to a third embodiment of the present invention;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 information disk 2 reproducing means 3 data aligning means 4 data reading means 5 control means 6 disk drive 7 read head 8 read head drive 9 servo circuit 10 head amplifier 11 digital signal processing circuit 12 data alignment memory 13 memory controller

Claims (7)

[Claims] 1. A reproducing means for reading data of a plurality of tracks adjacent to each other on an information disk having a plurality of tracks formed concentrically or spirally on a recording surface, and sequentially reproducing the data reproduced by the reproducing means. A data aligning means for storing and aligning tracks in the order of arrangement; and a memory read for reading aligned data from the data aligning means at a speed lower than a sum of data reading speeds from a plurality of tracks which can be read in parallel by the reproducing means. Means for writing data from the reproducing means to the data aligning means in parallel with the read-out of the aligned data by the data aligning means, and reading data for one revolution of the information disk, thereby setting a read track of the reproducing means. Track jump to advance a certain amount, and when an abnormal track jump occurs, Multitrack disk reproducing apparatus provided with a control means for controlling so as to re-set the read track means in the proper position. 2. The information disc is a disc in which a plurality of tracks are formed in a spiral shape, and the control means reads part of the reproducing means when a track jump for moving the reading track forward or when an abnormal track jump occurs. 2. The multi-track disc reproducing apparatus according to claim 1, wherein a track jump is performed so as to overlap a track which has already been read, and reading of data is immediately resumed using a reproducing means corresponding to an unread track. 3. The control means sets the number of tracks to be read in parallel by the reproducing means to one when the data storage amount of the data alignment means exceeds a predetermined value, and when the data storage amount of the data alignment means becomes equal to or less than the predetermined value. 3. The multi-track disc reproducing apparatus according to claim 1, wherein the number of tracks read by said reproducing means in parallel is increased. 4. The control means is configured to increase or decrease the number of effective read tracks by increasing or decreasing the number of tracks written in parallel to the data alignment means among data of tracks read in parallel by the reproducing means. 3. The multi-track disc reproducing device according to 3. 5. The information disc is a disc in which tracks are formed in a spiral shape, and the control means is configured such that the reproduction speed per track of a plurality of tracks to be reproduced in parallel by the reproduction means is equal to the read speed of the memory read means. 4. The data reproducing apparatus according to claim 3, wherein when the data storage amount of the data aligning means is equal to or more than a predetermined value, the number of tracks read in parallel by the reproducing means is set to one and reproduction is performed without performing a track jump. Item 5. The multi-track disk reproducing device according to item 4. 6. An information disk according to claim 1, wherein said information disk is a disk having tracks formed in a spiral shape, and said control means controls a read speed of a plurality of tracks to be reproduced in parallel by said reproduction means to be equal to a read speed of said memory read means. In the case of different speeds, when the data storage amount of the data alignment means is equal to or more than a predetermined value, the number of effective reproduction tracks is set to one, and the reproduction speed per track is changed to substantially the same as the read speed of the memory read means,
5. The multi-track disk reproduction according to claim 3, wherein when the data storage amount of the data alignment means becomes equal to or less than a predetermined value, the number of effective reproduction tracks is increased and the reproduction speed per track is restored. apparatus. 7. An information disk is a disk on which digital audio data is recorded, and a memory reading means reads digital audio data at a predetermined speed, converts the read digital audio data into an audio signal, and outputs the audio signal. 7. The multi-track disc reproducing apparatus according to claim 1, wherein the multi-track disc reproducing apparatus is configured to include a D / A converter circuit.