JPH09231661A - Data reproducing method and device therfor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time from receiving a read command until completing the read of data in a CD(compact disk)-ROM(read only memory) driving device. SOLUTION: In a CD-ROM driving device capable of reading data at a six- fold linear velocity as fast as the standard linear velocity, with a read command received, a disk 4 is not rotated immediately to run up to the six-fold faster linear velocity, but rotated to gain the standard velocity first. Then, a part or all of the date block required in the read command is reproduced at the standard linear velocity. In the number of the date block required in the read is small, all the data block required is reproduced at the standard linear velocity and then at six-fold faster velocity, to wait for the next read command. If the required data block is many, the remaining data block unable to be reproduced at the standard linear velocity is reproduced by two to six-fold faster velocity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-ROM drive or a similar data reproducing apparatus and a data reproducing method using the same.

[0002]

2. Description of the Related Art A CD-ROM uses a CD (Compact Disk) as a ROM (Read Only Memory), and is used in computer systems like a semiconductor ROM. Since high-speed processing is required in a computer system, the scanning speed (linear speed) of a CD-ROM is changed to the standard scanning speed of an audio CD (1.
2 to 1.4 m / s) is generally doubled or tripled.

[0003]

SUMMARY OF THE INVENTION CD-RO
As the scanning speed of M increases, the time required to rise from the time when the scanning is stopped to the predetermined maximum scanning speed, that is, the start-up required time becomes longer. Recording medium disc (CD-ROM)
If the motor for rotating the motor is constantly rotated so that the maximum scanning speed can be obtained, the startup time does not matter so much, but if the read command does not occur for a predetermined time or longer to save power, the motor rotation When the CD-ROM drive device is configured to stop, the motor is started each time a read command is generated in the power save state, and the total time required to reproduce data from the CD-ROM (access The ratio of the motor starting time to the total of the time and the data conversion time) becomes large. In a computer system, it is rare that data is continuously reproduced from a CD-ROM for a long time, and it is often intermittently reproduced. Therefore, even if the scanning speed of the CD-ROM is set to, for example, 6 times the standard speed, the required playback time is simply 1
It will not be / 6. The increase in the motor start-up time accompanying the increase in speed also occurs in a system in which a plurality of CD-ROMs are replaced and used. That is, after reproducing the first desired data from one CD-ROM, another CD-ROM is reproduced.
Therefore, when reproducing the second desired data, the rotation of the motor is temporarily stopped, the disk is exchanged, and then the motor is restarted. Therefore, the ratio of the startup time to the total required playback time becomes large. Although the CD-ROM drive device has been described above, other optical disk devices, magneto-optical disk devices, magnetic disk devices, and the like have similar problems.

Therefore, an object of the present invention is to provide a data reproducing method and apparatus capable of shortening the reproducing time.

[0005]

According to the present invention for achieving the above object, data is recorded based on relative scanning between a recording medium on which data is recorded in the form of a plurality of data blocks and a signal conversion head. In the data reproducing method of reading with the signal converter, a step of generating a read command instructing to reproduce a predetermined amount of data blocks selected from the plurality of data blocks, and a state in which the scanning is stopped, When the read command is generated, the linear velocity of the scanning is gradually increased in response to the read command so that a plurality of stages of velocities can be sequentially obtained, and at the stage of the lower linear velocity of the plurality of stages. Reproducing at least a part of the selected predetermined amount of data blocks, and selecting the predetermined amount of data at the lower linear velocity stage. When the reproduction of all the data blocks is not completed, a step of reproducing the remaining data blocks at the higher speed stage among the plurality of stages is provided. is there. As described in claim 2, when the reproduction of all the predetermined amount of data blocks is completed at the lowest linear velocity stage, the scanning linear velocity is linearly increased to the highest linear velocity stage. Is desirable. Further, as described in claim 3, it is desirable to rationally proceed with the reproduction together with the determination of the remaining data blocks and the determination of the stage of the linear velocity. Further, as described in claim 4, the technique of claims 1 to 3 can be applied to a method of exchanging the first and second discs for reproduction. Further, as described in claim 5, it is desirable to stop the scanning when the read command is not generated for a predetermined time or longer. It is desirable to construct the data reproducing apparatus as described in claim 6.

[0006]

According to the invention of each claim, the data
Instead of reproducing all the data at the maximum linear velocity, at least a part of the data is reproduced at a linear velocity lower than the maximum linear velocity. Therefore, when the amount of data required to be reproduced is small, it can be reproduced only at a low linear velocity. The rise time of the scanning linear velocity is shorter as the linear velocity is lower. Therefore, the total time of the access time and the data conversion time (actual read time), that is, the required reproduction time can be shortened. Further, since the scanning linear velocity finally becomes the highest, the reproduction can be started quickly when the next read command occurs while the scanning linear velocity is maintained. Further, in the invention of claim 2, when the reproduction of all the data blocks of the predetermined amount is completed at the lower linear velocity, the linear velocity becomes higher up to the highest linear velocity. High linear velocity. According to the invention of claim 3, rational reproduction is possible even when at least the first, second and third linear velocities are used. According to the invention of claim 4, it is possible to shorten the time required for the reproduction when the plurality of disks are exchanged for reproduction. According to the invention of claim 5, the power save is achieved and the required regeneration time is shortened.

[0007]

[First Embodiment] Next, a CD-ROM drive device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a host computer 1 and a CD-ROM drive device 2. The CD-ROM drive device 2 functions as a data supply source for the host computer 1, and both are connected by a bus 3.

The CD-ROM drive device 2 has a function as a recording medium disk (CD-ROM) 4 composed of a CD, a disk rotation motor 5, an optical pickup 6 as a signal converter, and a positioning means for the optical pickup 6. The optical pickup feed control means 7, which also functions as a scanning drive means together with the motor 5, the motor servo circuit 8, the waveform shaping circuit 9, the synchronization detection and demodulation circuit 10, and the PLL circuit 1.
1, an error detection / correction circuit 12, an interface circuit 13, a system controller 14 including a microprocessor, a program ROM 15, and a clock generator 16.

The disc (CD-ROM) 4 has a spiral track extending from the inner side to the outer side of the disc. In this track, 8 bits are 1 byte and 2352 are formed.
A large number of data in which one byte is one unit (one data block)
Data is recorded in optical pits in the form of tab locks. One data block is reproduced at 1/75 second when reproduced at the same standard speed as the scanning speed (1.2 to 1.4 m / s) of an audio CD. As is well known, CD
And CD-ROM, the data is a constant linear velocity or C
It is recorded by LV (Constant Linear Velocity), and this data is reproduced by CLV. In order to make the relative scanning motion between the disc 4 and the optical pickup 6 CLV, the rotational speed of the disc 4 is lowered as the scanning from the inside to the outside of the disc 4 progresses.

The optical pickup 6 incorporates a well-known laser light source, objective lens, light receiving element, focus control means, tracking control means, etc., projects laser light onto the disk 4, and reads the optical pits of the disk 4 by this reflected light. . The laser light is sent in the radial direction of the disk 4 as the reproduction progresses. The radial feed of the laser light is achieved by the control of the signal pickup feed control means 7.
The pickup feed control means 7 functions not only as a positioning means for the optical pickup 6 at the time of seeking, but also as a part of the scanning driving means.

A waveform shaping circuit 9 connected to the optical pickup 6 amplifies a high frequency (RF) signal corresponding to the array of optical pits obtained from the optical pickup 6 and then waveform-shapes and outputs a binarized signal. The disk 4 has a well-known EFM (Eight to Fourteen Modu).
Since the data is recorded by the modulation of the station system, the output of the waveform shaping circuit 9 is also an EFM signal.

The waveform shaping circuit 9 is a synchronization detection and demodulation circuit 1.
0 and a PLL (Phase Locked Loop) circuit 11 are connected. The PLL circuit 11 generates a reproduced clock signal (synchronous signal) synchronized with each bit of the EFM signal obtained from the waveform shaping circuit 9. The PLL circuit 11 is also connected to the system controller 14 in order to control the switching of the center frequency of the VCO in the PLL circuit 11.

The synchronization detection and demodulation circuit 10 detects whether or not the PLL circuit 11 is in a locked state, that is, the PLL circuit 1
It is detected whether or not 1 operates in synchronization with the EFM signal, and when synchronized, the reproduction clock signal (synchronization signal) obtained from the PLL circuit 11 is sent to the motor servo circuit 8. Further, the synchronization detection and demodulation circuit 10 is a PLL circuit 11
Is synchronized with the EFM signal, that is, in the locked state, the reproduced clock signal, that is, the synchronization signal is used to convert the EFM signal into, for example, the NRZ format (Non Return Z
demodulates to a digital signal of ero).

A well-known error detection and correction circuit 12 connected to the synchronization detection and demodulation circuit 10 detects an error in the demodulated data (reproduced data), and corrects if an error is detected. To do. The error detection and correction circuit 12 is connected to the interface circuit 13 and the system controller 14. The waveform shaping circuit 9, the synchronization detection / demodulation circuit 10, and the error detection / correction circuit can be collectively referred to as reproduction signal processing means.

The interface circuit 13 is connected between the error detection / correction circuit 12 and the host computer 1, and is also connected between the host computer 1 and the system controller 14.

The clock generator 16 is connected to the system controller 14, the motor servo circuit 8 and the error detection and correction circuit 12, and under the control of the system controller 14, the standard clock signal of the standard frequency f1 and the standard frequency f1 of 2 are supplied. Frequency 4 times 6 times frequency f2, f4
, F6 reference clock signal.
It is supplied to the data servo circuit 8 and the error detection and correction circuit 12.

The motor servo circuit 8 has a function of fv (frequency-
Voltage) converter 17, reference voltage generator 18, and error amplifier 1
9, a phase comparator 20, an adder 21 and an amplifier 22. The f-v converter 17 is connected to the reproduction clock signal of the sync detection and demodulation circuit 10, that is, the sync signal output line and also connected to the reference frequency designation data output line of the system controller 14 to correspond to the frequency of the reproduction clock signal. To produce a voltage signal, i.e. an fv converted output signal. The reference voltage generator 18 is connected to the system controller 14 and selectively selects a reference voltage in four stages (five stages including zero) based on reference frequency designation data, that is, speed command data supplied from the system controller 14. Occurs in. The error amplifier 19 connected to the fv converter 17 and the reference voltage generator 18 detects the voltage corresponding to the difference between the frequency corresponding voltage obtained from the fv converter 17 and the reference voltage (speed command voltage), that is, the frequency. Generate an error signal. The phase comparator 20 is connected to the reproduction clock signal output line of the synchronization detection and demodulation circuit 10 and the clock generator 16, and generates a voltage corresponding to the phase difference between the reproduction clock signal and the reference clock signal, that is, a phase error signal. The adder 21 is connected to the error amplifier 19 and the phase comparator 20 and forms a signal obtained by adding the frequency error signal and the phase error signal, that is, a combined error signal. An amplifier 22 between the adder 21 and the motor 5 amplifies the combined error signal and drives the motor 5. In addition,
The printer 5 and the pickup feed control means 7 function as a scanning drive means.

The system controller 14 as reproduction control means is composed of a microprocessor, includes a CPU and a RAM for performing various operations, and is stored in an operation control ROM stored in a program ROM 15 connected to the CPU. Operates according to the existing operation control program. FIG. 2 is a block diagram equivalently or functionally showing a part of the system controller 14 of FIG. As is apparent from FIG. 2, the system controller 14 includes a seek signal generation means 14a, a power save determination means 14b, a read end determination means 14c, and a reference frequency designation data generation means 1.
4d, a center frequency setting signal generating means 14e, a reproduction address detecting means 14f and a desired address detecting means 14g. The desired address detecting means 14g decodes the read command sent from the host computer 1 via the interface circuit 13, detects the desired address to be read, and notifies the seek signal generating means 14a of this desired address. . Further, the reproduction address detecting means 14f detects a block address signal (track address signal) from the demodulation data obtained from the synchronization detecting and demodulating circuit 10 and outputs a block.
To the black signal generating means 14a. The seek signal generation means 14a is a seek for controlling the pickup feed control means 7 so as to position the reproducing laser beam at the position on the track where the desired data block requested to be read is recorded, that is, at the desired address. Generate a signal. That is, the seek signal generating means 14a generates a seek signal for matching the reproduction address with the desired address based on the desired address and the reproduction address. The power save determination means 14b sends a power save (power saving) signal when a fixed time has elapsed from the end of the read operation, and cancels the power save when a read command is generated again after the fixed time has elapsed. The read end determination means 14c determines the read end time point based on the output of the error detection and correction circuit 12, and notifies the power save determination means 14 and the reference frequency designation data generation means 14d. The reference frequency designation data generation means 14d is the power save determination means 1
When 4b is producing an output indicating power saving, data for stopping the scanning speed of the laser light on the disk 4 or zero data is produced. Further, the reference frequency designation data generating means 14d increases the scanning linear velocity stepwise as shown in FIG. 4 or 5 when the power save is canceled by the generation of the next read data during the power save period. To generate reference frequency designation data for. In this embodiment, the scanning speeds are V1, V2, V4,
Since V6 is changed in four steps, four-step reference frequency designating data is generated in addition to the frequency zero data indicating the stop. The generation form of the reference frequency data changes depending on the amount of data blocks requested to be read. Details of the generation form of the reference frequency designation data will be described later with reference to FIGS. 4 and 5. The reference frequency designation data generating means 14d
Is also connected to the reproduction address detecting means 14f and the desired address detecting means 14g, and has a function of determining the presence or absence of a read residue based on the addresses obtained from them. The center frequency setting signal generating means 14e is the PLL circuit 1
A signal for changing the center frequency of the VCO 1 (not shown) according to the stepwise change of the scanning linear velocity is generated.

Although not shown in FIG. 2, the system controller 14 includes an error detection and correction circuit 12 to the error detector 12.
In order to receive the signal indicating the presence or absence of the error, transfer the reproduction data in block units to the host computer 1 if there is no error, and execute the retry (re-read) if there is an error. Has retry control means.

Next, the operation when a read command is issued during the suspension period of the motor 5 will be described with reference to FIG.
First, as shown in step S0 of FIG. 3, when a read command is generated from the host computer 1 as the read command generating means, the system controller 14 receives the read command and the seek signal generating means 14a. From this, a seek signal for seeking the desired data block is generated, and the power save of the power save determination means 14b is released. Next, in step S1, a first frequency for obtaining the standard linear velocity from the reference frequency designating data generating means 14d.
The reference frequency designation data of the stage is generated, and the clock generator 16 generates the reference clock signal of the first stage having the standard frequency f1. Further, the reference voltage generator 18 generates the reference voltage (speed command voltage) of the first stage in response to the reference frequency designation data of the first stage. As a result, the motor servo circuit 8 operates in the section t0 to t3 of FIG. 4 and t0 to t2 of FIG.
The motor 5 is controlled so that the scanning linear velocity V1 of the first stage (standard) is obtained as shown in the section. The rotation speed and the scanning linear velocity of the motor 5 gradually increase with an inclination as shown at t0 to t1 in FIGS. 4 and 5, and at the time t1, the scanning linear velocity V1 of the first stage (standard). become.

Next, at step S2, data blocks (several data blocks) having a first predetermined amount or less are read at the standard linear velocity V1. A data block less than the first predetermined amount is read from t0 to t in FIG.
2. The time width from t1 to t2 in FIG. 5 differs depending on the performance of the motor 5 used, but is set to the required read time of 10 or less data blocks, for example.

Next, as shown in step S3, it is determined whether or not there is the rest of the data block read requested to be read by one read command issued from the host computer 1. It is judged by the quasi-frequency designation data generating means 14d.

When it is determined in step S3 that there is no data block remaining in the read, the maximum linear velocity V6 of the scanning linear velocity is set as shown in step S4. FIG. 4 shows this state, in which the control for increasing the scanning linear velocity from V1 to V6 is executed at t3 after the reading of all the desired data blocks is completed at t2. In order to increase the scanning line speed from V1 to V6, the reference frequency specifying data for obtaining the maximum scanning line speed V6 is generated from the reference frequency specifying data generator 14d shown in FIG. Supply to the clock generator 16 and the reference voltage generator 18,
At the same time, it is also supplied to the center frequency setting signal generating means 14e of FIG. As a result, a control loop for obtaining the maximum scanning linear velocity V6 is formed, and the scanning linear velocity is t3 to t5 in FIG.
As shown in FIG. T in FIG.
When the predetermined maximum scanning linear velocity V6 is reached at time 5, this state is maintained and the next read command is awaited. Next Lee
When the command is issued, the motor 5 has already been activated, so that the motor 5 reaches the desired rotation speed within a relatively short time.

At step S3, the remaining data of the lead is read.
When it is determined that there is a lock block, it is determined whether or not the maximum scanning linear velocity is currently V6, as shown in step S5. If it is determined in step S5 that the maximum scanning linear velocity is not reached, the scanning linear velocity is increased by one step as shown in step S6. FIG. 5 shows the change of the scanning linear velocity with the step S6. At t2 in FIG. 5, when the second stage reference frequency designating data for obtaining the double speed V2 is generated from the reference frequency designating data generating means 14d in FIG. 2, the motor servo circuit 8 becomes 2 The control for obtaining the scanning linear velocity of double speed V2 is executed, and the double speed V2 is obtained at time t3.

Next, as shown in step S7, the data blocks of the second predetermined amount or less are read. The second predetermined amount can be arbitrarily determined, and may be the same as the first predetermined amount in step S2, may be larger than the first predetermined amount, or may be at least good.

Next, returning to step S3, the presence / absence of data blocks remaining in the read is re-determined. Lead remaining data
If there is no data block, the process proceeds to step S4, and if there is a data block remaining in the read, the process proceeds to step S5. FIG. 6 shows that there is a lead remaining at time t4, and since the scanning linear velocity has not reached the maximum linear velocity V6, the scanning linear velocity is 4 times V4 at t4.
The control to raise to 4 is started, and it becomes 4 times speed V4 at t5. The operation from t4 to t6 in FIG. 5 is based on step S6 in FIG. From T5 to t6, the remaining data blocks are read according to step S7. At the time t6, it is determined in step S3 that there is data remaining from the lead, and when it is determined in step S5 that the maximum linear velocity V6 is not reached, the scanning linear velocity is increased by 6 times in step S6. To V6. Next, in step S7, for example, 500 data blocks are read. Thereafter, in step S3, it is judged whether or not there is data remaining in the read. If there is no remaining data block, the process proceeds to step S4, and if there is a remaining data block, the process proceeds to step S5. Since it is judged that the maximum linear velocity is V6 here, the program proceeds to step S8 to read all the remaining data blocks in the desired data block.

When it is determined in step S3 of FIG. 3 that there are no remaining data blocks (for example, at the time t3 in FIG. 4) or in step S8, the reading of all remaining data blocks is completed. As shown in step S9, it is determined whether or not a predetermined time has elapsed from the time point (for example, the time point t8 in FIG. 5). In this judgment, as shown in FIG. 2, the read end judgment means 14c detects the read end time, and in response to this detection, the power save judgment means 14b detects a predetermined time by a built-in timer. Achieved by measurement. Step S9
When it is determined that the predetermined time has elapsed in step S,
At 10, the motor 5 is stopped and controlled. That is, a predetermined time (t2 to t2 in FIG. 4) after the end of reading by the power save determination means 14b.
When it is found that t6 or t8 to t9 in FIG. 5 has elapsed, the reference frequency designating data generating means 14d for stopping the motor 5 outputs data for zeroing the scanning linear velocity.
The motor 10 is output and the motor 10 is stopped. This eliminates the power loss of the motor 10.

As is apparent from the above, according to the present embodiment, when the number of data blocks to be read at one time is small, all desired data blocks from the time when the read command is generated. The time to the end of the read can be shortened. For example, when several data blocks are read by one read command, in FIG. 4, all the data blocks are read at time t2 slightly before the time t3 at the end of the standard linear velocity V1. The lead is over. Therefore, the time required for reading is extremely short even at t0 to t2. On the other hand, according to the conventional method, in the case of reading at the predetermined maximum linear velocity V6 (6x speed), as shown by the chain line in Fig. 4, the scanning linear velocity reaches 6x speed V6 after the time t4. Since the reading is started, the time required for reading is at least t0 to t4, which is longer than that of the present embodiment. Also, as shown in FIG. 5, even when all the reads of the desired data block are not completed in the period t1 to t2 of the standard linear velocity, the read is executed at the double speed V2 and the double speed V4. 1 because the scanning speed is increased
The read can be advanced at an appropriate speed with respect to the amount of data blocks required by the read command once, and as a result, the time required for the read can be shortened. Also,
If the average lead time is the same as before,
It is not necessary to use an expensive high torque motor for the motor 5, it is possible to use a low cost and low torque motor, and the cost can be reduced.

[0029]

[Second Embodiment] Next, a CD-ROM drive device of a second embodiment will be described with reference to FIGS. However,
6, parts that are substantially the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted. CD-ROM shown in FIG.
The tribe device has the same configuration as that of FIG. 1 except that a disk exchange device 30 is added to FIG. The disc exchanging device 30 exchanges and attaches a plurality of discs 4 and 4a to a disc rotating device including a motor 5. The disk exchange command is generated from the host computer 1, and the system controller 14 sends a control signal for executing the exchange of the disks 4 and 4a to the disk exchange device 30 according to the disk exchange command. The disk exchange device 30 executes the exchange of the disks 4, 4a as requested in response to the control signal.

FIG. 7 shows a C of FIG. 6 having a disk exchange function.
3 is a flowchart showing the operation of the D-ROM drive device. First, as shown in step S11, a read command indicating that the data block of the first disk 4 is to be read is issued from the host computer 1, and this read command is issued to the system controller. When the receiver 14 receives it, the next step S12 is the same as the step S1 in the figure.
The scanning linear velocity by the light is defined as the standard linear velocity V1. next,
In step S13, the first predetermined amount of data blocks are read at the standard linear velocity as in step S2 of FIG. Next, in step S14, another second disk 4a
Read command is issued from the host computer 1,
It is determined whether this is received. Second disk 4a
If the read command is not received, step S
As shown in 17, the operation is the same as that from step S3 to step S10 in FIG. On the other hand, when the read command for the second disk 4a is received in step S14, the rotation of the disk 4, that is, the rotation of the motor 5 is stopped as shown in step S15, and the next step S16 is executed. The disk 4 is removed from the motor 5, and the second disk 4a requested to be read by the host computer 1 is mounted on the motor 5. Then, the process returns to step S12, and this switch S12 and the subsequent operations are repeated. 6 and 7, the first and second
Although the two disks 4 and 4a are replaced, the same operation is performed when more disks are replaced and used.

As described above, when the disks 4 and 4a are replaced and read, a rotation stop period of the motor 5 occurs,
If the start and stop of the motor 5 increase, the average time required for reading increases. However, as shown in the present embodiment, the standard linear velocity V1 of the maximum linear velocity V6 or less, the double speed V2, and the double speed V2.
Even if 4, the data block is read, if the amount of data block read by one read command is small, the time from the read command generation until the read completion is completed. Can be significantly shortened.

[0032]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) By incorporating, for example, a time axis correction means for the reproduction data in the synchronization detection and demodulation circuit 10, the read data can be demodulated before the scanning linear velocity by the laser light reaches a constant value. Can be configured to. FIG. 8 illustrates the start of reading before the linear velocity becomes constant.
In FIG. 8, the constant linear velocity is obtained after t2 to t3, t5 to t6, t8 to t9 and t11. However, at t1, t4, t7, and t10 before the constant linear velocity, the PLL circuit 11 of FIG. 1 shifts to an operation within the lock pull-in range (lock range). Therefore, t1, t4, t
7, the read is started from t10, and the time width of the constant linear velocity is shortened to shorten the time from the generation of one read command to the completion of the read. When the time axis correction means for reproducing data is built in as described above, the motor 5 is rotated at a constant speed to reproduce the data on the disk 4, and the time of the reproducing data is reproduced. The axis can be corrected by the time axis correction means. In this case, the rotation speed of the motor 5 is increased stepwise when the motor 5 is started. That is, the CLV recording disk is CA
The present invention can be applied to the case of scanning at V (constant speed) or the case of CAV scanning of a CAV recording disk. (2) In the embodiment, the system controller 14 is a CPU
Although it is composed of a (microprocessor MPU), it may be composed of an individual circuit as shown in FIG. (3) The motor servo circuit 8 for executing the CLV control can be composed of circuits other than that shown in FIG. (4) Stop control of the motor 5 for power saving,
Based on the output of the power save determination means 14b, the motor 5
It can be modified to turn off the driving power source of. (5) Not limited to the CD-ROM, it can be applied to other data reproducing devices such as a magneto-optical disk device and a magnetic disk device. (6) The power save signal may be formed by the host computer 1 and sent to the CD-ROM drive device 2.

[Brief description of drawings]

FIG. 1 is a block diagram showing a CD-ROM drive device of a first embodiment.

2 is a block diagram equivalently showing a part of the function of the system controller 14 of FIG. 1. FIG.

3 is a flowchart showing a read operation in the order of steps by the apparatus of FIG.

4 is a diagram showing the relationship between time and scanning linear velocity when the number of data blocks requested to be read by one read command in the apparatus of FIG. 1 is small.

5 is a diagram showing the relationship between time and scanning linear velocity when the number of data blocks requested to be read by one read command in the apparatus of FIG. 1 is large.

FIG. 6 is a block diagram showing a CD-ROM drive device of a second embodiment.

7 is a flow chart showing a flow of a read operation of the apparatus of FIG.

FIG. 8 is a diagram showing a relationship between a scanning linear velocity and a lead period in a modified example.

[Explanation of symbols]

 4 Disc (CD-ROM) 6 Optical pickup 8 Motor servo circuit

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[Procedure amendment]

[Submission date] September 11, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The motor servo circuit 8 has a function of fv (frequency-
Voltage) converter 17, reference voltage generator 18, and error amplifier 1
9, a phase comparator 20, an adder 21 and an amplifier 22. The f-v converter 17 is connected to the reproduced clock signal of the sync detection and demodulation circuit 10, that is, the sync signal output line .
Ri forms a voltage signal or f-v converter output signal corresponding to the frequency of the reproduction clock signal. The reference voltage generator 18 is connected to the system controller 14, and has four stages (5 including zero, based on the reference frequency designation data or speed command data supplied from the system controller 14).
) Is selectively generated. f-v converter 1
7 and an error amplifier 19 connected to the reference voltage generator 18 generate a voltage corresponding to the difference between the frequency corresponding voltage obtained from the fv converter 17 and the reference voltage (speed command voltage), that is, a frequency error signal. . The phase comparator 20 is connected to the reproduction clock signal output line of the synchronization detection and demodulation circuit 10 and the clock generator 16, and generates a voltage corresponding to the phase difference between the reproduction clock signal and the reference clock signal, that is, a phase error signal. The adder 21 is connected to the error amplifier 19 and the phase comparator 20 and forms a signal obtained by adding the frequency error signal and the phase error signal, that is, a combined error signal. An amplifier 22 between the adder 21 and the motor 5 amplifies the combined error signal and drives the motor 5. The motor 5 and the pickup feed control means 7 function as a scanning drive means.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The system controller 14 as a reproduction control means is composed of a microprocessor, includes a CPU and a RAM for performing various operations, and has a program ROM 15 connected thereto, that is, an operation control ROM stored in the operation control ROM. Operates according to the program. FIG. 2 shows FIG.
FIG. 3 is a block diagram equivalently or functionally showing a part of the system controller 14 of FIG. As is apparent from FIG. 2, the system controller 14 has a seek signal generating means 14a.
And power save determination means 14b and read end determination means 1
4c, reference frequency designation data generating means 14d, center frequency setting signal generating means 14e, and reproduction address detecting means 14
f and desired address detecting means 14g. The desired address detecting means 14g decodes the read command sent from the host computer 1 via the interface circuit 13, detects the desired address to be read, and notifies the seek signal generating means 14a of this desired address. Also,
The reproduction address detecting means 14f is a synchronization detecting and demodulating circuit 1.
A block address signal (track address signal) is detected from the demodulated data obtained from 0 and notified to the seek signal generating means 14a. The seek signal generating means 14a outputs a seek signal for controlling the pickup feed control means 7 so as to position the reproducing laser beam at a position on the track where the desired data block requested to be read is recorded, that is, at a desired address. Occur. That is, the seek signal generating means 14a generates a seek signal for matching the reproduction address with the desired address based on the desired address and the reproduction address. The power save determination means 14b sends a power save (power saving) signal when a fixed time has elapsed from the end of the read operation, and cancels the power save when a read command is generated again after the fixed time has elapsed. The read end determination means 14c determines the read end point based on the output of the error detection and correction circuit 12,
This is notified to the power save determination means 14 and the reference frequency designation data generation means 14d. The reference frequency designation data generating means 14d generates data for making the scanning speed of the laser beam on the disk 4 zero, that is, stop data, when the power saving determining means 14b is generating an output indicating power saving. Further, the reference frequency designation data generating means 14d increases the scanning linear velocity stepwise as shown in FIG. 4 or 5 when the power save is canceled by the generation of the next read data during the power save period. To generate reference frequency designation data for. In this embodiment, since the scanning speed is changed in four steps of V1, V2, V4, and V6, four steps of reference frequency designation data are generated in addition to the data of frequency zero indicating stop. The generation form of the reference frequency data changes depending on the amount of data blocks requested to be read. Details of the generation form of the reference frequency designation data will be described later with reference to FIGS. 4 and 5. The reference frequency designation data generating means 14d is also connected to the reproduction address detecting means 14f and the desired address detecting means 14g, and has a function of determining the presence or absence of a read residue based on the addresses obtained from them. The center frequency setting signal generating means 14e generates a signal for changing the center frequency of the VCO (not shown) of the PLL circuit 11 according to the stepwise change of the scanning linear velocity.

Claims (6)

[Claims] 1. A data reproducing method for reading the data by the signal converter based on relative scanning between a recording medium on which data is recorded in the form of a plurality of data blocks and the signal converter, wherein the plurality of data are Generating a read command instructing to reproduce a predetermined amount of data blocks selected from the blocks, and in the state where the scanning is stopped, when the read command is generated, the read command is generated in response to the read command. The linear velocity of scanning is increased stepwise so that linear velocities of a plurality of stages are sequentially obtained, and at least a part of the selected predetermined amount of data blocks is selected in the lower linear velocity of the plurality of stages. When the reproduction is completed and the reproduction of all of the selected predetermined amount of data blocks is not completed at the stage where the linear velocity is lower, Data reproducing method, wherein a data block and a step of reproducing at the stage of higher linear velocities of said plurality of stages. 2. A data reproducing method for reading the data by the signal converter based on relative scanning between a recording medium on which data is recorded in the form of a plurality of data blocks and the signal converter, wherein the plurality of data are read. Generating a read command instructing to reproduce a predetermined amount of data blocks selected from the blocks, and in the state where the scanning is stopped, when the read command is generated, the read command is generated in response to the read command. The linear velocity of scanning is increased stepwise so that linear velocities of a plurality of stages are sequentially obtained, and at least a part of the selected predetermined amount of data blocks is selected in the lower linear velocity of the plurality of stages. When the reproduction is completed and the reproduction of all of the selected predetermined amount of data blocks is not completed at the stage where the linear velocity is lower, Data block is reproduced at the higher linear velocity stage of the plurality of stages, and the reproduction of all of the selected predetermined amount of data blocks is completed at the lower linear velocity stage. Linearly increasing the linear velocity of the scanning from the lower stage to the highest stage of the linear velocities of the plurality of stages without increasing the linear velocity of the scan stepwise. -How to regenerate data. 3. A method for reproducing data, wherein the data is read by the signal converter based on relative scanning between a recording medium on which data is recorded in the form of a plurality of data blocks and the signal converter. Providing a scanning device capable of stepwise changing the speed to at least first, second and third linear velocities, and instructing to reproduce a predetermined amount of data blocks selected from the plurality of data blocks Generating a read command, and in the state where the scanning is stopped, in response to the read command when the read command is generated, causing the scanning to be in the state of the first linear velocity. Reproducing at least a portion of the selected predetermined amount of data blocks in the scanning state of the first linear velocity; A step of determining whether or not there is a remaining data block that has not yet been reproduced within the predetermined amount of data blocks; and if it is determined in the determining step that there is no remaining data block. If it is determined that there is a remaining data block in the determination step, the scanning is performed at the second linear velocity. A state, a step of reproducing at least a part of the remaining data block in the scanning state of the second linear velocity, and a step of reproducing the data block in the scanning state of the second linear velocity. When it is determined that there is no remaining data block in the step of re-determining whether there is any remaining data block and the step of re-determining, the scan is performed in the above Of the remaining linear data velocity, and if it is determined in the re-determination step that there is a remaining data block, all the remaining data blocks in the scanning state of the third linear velocity. And a step of reproducing the data. 4. A disc and a signal converter, wherein at least one disc selected from at least first and second recording medium discs in which data is recorded in the form of a plurality of data blocks is mounted on a rotating device. In a data reproducing method for reading the data by the signal converter based on relative scanning with, a scanning device capable of stepwise changing the linear velocity of the scanning into at least first, second and third linear velocities. And a command to select one disk from the first and second disks and to reproduce a predetermined amount of data blocks selected from the plurality of data blocks. Generating a read command; and when the first disc is mounted on the rotating device and the scanning is stopped, A step of bringing the scan into a state of a first linear velocity when a read command for instructing reproduction of a tape block is generated, and the selected predetermined amount in the scan state of the first linear velocity. Reproducing at least a part of the data block of the second disk, determining whether or not a read command for instructing reproduction of the data block of the second disk is generated, When it is determined that the reproduction of the data block of the disc is not instructed, it is determined whether or not there is a remaining data block which has not been reproduced in the selected predetermined amount of data blocks. Determining step, and if it is determined that there is no remaining data block in the step of determining the remaining data block,
When the scanning is brought to the third linear velocity state, and when it is determined that there is a remaining data block in the step of determining the remaining data block,
Setting the scan to the second linear velocity state; regenerating at least a portion of the remaining data block in the second linear velocity scanning state; The step of re-determining whether or not there is a remaining data block that has not been reproduced after the reproduction in the scanning state; and the step of re-determining when there is no remaining data block, the scanning is performed. To the third linear velocity state, and if it is determined in the re-determination step that there is a remaining data block, the remaining data block is scanned in the third linear velocity scanning state. In the step of reproducing the entire data block, and in the step of determining the second disc,
When it is determined that a read command for instructing to reproduce a predetermined amount of data blocks selected from a plurality of data blocks of the first disk is generated, the rotation of the first disk is performed. Stopping, removing the first disc, and mounting the second disc on the rotating device in its place; rotating the second disc to obtain the first linear velocity; A step of reproducing at least a part of a predetermined amount of data blocks selected from the second disk, and a read command instructing reproduction of a data block of a disk other than the second disk is generated. And a step of determining whether or not the reproduction of a data block of a disk other than the second disk is not instructed, Determining whether or not there is a remaining data block that has not been reproduced within the selected predetermined amount of data blocks; and if the remaining data block on the second disc is When it is determined that there is no remaining data block in the determination step of step (a), the step of setting the scan to the scanning state of the third linear velocity; and, if the remaining data on the second disk is When it is determined in the block determination step that there is a remaining data block, the step of bringing the scan into the second linear velocity state, and the second state in the second linear velocity scanning state. Reproducing at least a portion of the remaining data block of the disc, and after reproducing by the scanning condition of the second linear velocity, the reproduction is still performed on the second disc. The step of re-determining whether or not there is a remaining data block that is not present; and when it is determined in the step of re-determining that there is no remaining data block in the second disc, the scanning is performed in the third step. At the linear velocity state, and if it is determined in the re-determination step that the second disk has a remaining data block,
A step of reproducing all the remaining data blocks in the scanning state of the third linear velocity. 5. The method according to claim 1, further comprising a step of stopping the scanning when the next read command does not occur for a predetermined time or more after the reproduction of the data block is completed. Alternatively, the data reproducing method described in 3 or 4. 6. A signal converter for reading the data from a recording medium in which the data is divided into a plurality of data blocks and recorded, and a reproduction signal processing means connected to the signal converter. Scanning drive means for causing relative scanning between the recording medium and the signal converter, and a read command for instructing reproduction of a desired data block from the recording medium. Read command generating means, and positioning means connected to the read command generating means for positioning the signal converter with respect to the recording medium so that the desired data block can be reproduced. A read command generated in a state in which the read command generating means, the reproduction signal processing means, the scanning driving means and the positioning means are connected and the scanning is stopped. In response to the command, the scanning drive means is controlled so as to increase the linear velocity of the scanning stepwise so that the linear velocities of a plurality of stages are sequentially obtained, and one of the plurality of stages having a lower linear velocity. In the case where at least a part of the selected predetermined amount of data blocks is reproduced, and the reproduction of all of the selected predetermined amount of data blocks is not completed at the lower linear velocity stage, the remaining data blocks are reproduced. And a control means for controlling the reproduction signal processing means and the positioning means so as to reproduce at a higher linear velocity step of the plurality of steps.