JPH11238314A - Device for reading data out of disk recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for reading data out of disk recording medium in which power consumption can be surely reduced. SOLUTION: When data read out of a compact disk(CD) 1 are stored in the full storage capacity of a buffer memory 9 at the time of reproducing, the read of data out of the CD 1 is stopped, information showing the states of the rotation control of a spindle motor 2, focus control and tracking control is held and switch circuits 13 and 14 are turned off. When the read of data out of the buffer memory 9 is advanced and the stored data get less than the predetermined capacity, the switch circuits 13 and 14 are turned on, servo control with a servo circuit 5 is executed based on the held information showing the respective states of the rotation control of the spindle motor 2, the focus control and the tracking control and the read of data out of the CD 1 is started again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reading data from a disk recording medium for reading and processing data such as an audio signal recorded on an optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art A reproducing apparatus for reproducing information such as an audio signal recorded on an optical disk called a CD (compact disk), and information such as an audio signal recorded on a magneto-optical disk called an MD (mini disk) 2. Description of the Related Art A reproducing apparatus for reproducing an audio signal or a recording / reproducing apparatus capable of recording information such as an audio signal on an MD as well as reproducing an audio signal recorded on the MD has been widely used. Is coming.

[0003] These discs, such as CDs and MDs, are used as recording media, and for example, some disk devices capable of reproducing audio signals or recording and reproducing audio signals are being reduced in size and weight, Portable disk devices that can be carried around in pockets or bags and used even when they are out of the office have been provided and used.

In the case of such a portable disk device,
The digital audio signal read by the optical pickup is temporarily stored in a buffer memory mounted on the disk device, and is read from the buffer memory and reproduced.

By reproducing the digital audio signal read from the disk through the buffer memory in this way, for example, disturbance such as vibration is given to the disk device, and the disk light of the laser beam emitted from the optical pickup is emitted. Even when a so-called track jump in which the upper irradiation position temporarily shifts occurs, since the digital audio signal stored in the buffer memory is reproduced, no sound skipping or the like occurs.

[0006] While reading and reproducing the digital audio signal stored in the buffer memory, the laser beam emitted from the optical pickup is returned to an accurate position on the disk, so that the continuous audio signal is reproduced. Reproduction can be performed without interruption.

[0007]

As described above, in the case of a disk device using a disk as a recording medium, the processing speed for reading a digital audio signal recorded on the disk and recording it in a buffer memory is as follows. ,
It is set to be faster than the processing speed when reading out the digital audio signal from the buffer memory.

Therefore, when the digital audio signal read from the disk is stored in a buffer memory full,
The disk device waits until there is free space in the buffer memory, for example, by positioning the read position of the digital audio signal on the track on the disk from which the audio signal is read next,
When the buffer memory becomes available, the reading of the digital audio signal from the disk and the writing of the read digital audio signal to the buffer memory are resumed.

However, according to this method, even when the digital audio signal is not actually read from the disk, the optical pickup irradiates the disk with laser light, receives the reflected light, and performs focus control and tracking. Since the control mechanism is driven, for example, for performing control, there is a problem that power consumption is larger than the amount of data to be read.

Therefore, it is conceivable to perform control so that the digital audio signal is read out from the disk intermittently. For example, when the digital audio signal read from the disk is written to the full storage capacity of the buffer memory, the reading of the digital audio signal from the disk is stopped. Then, when reading of data from the buffer memory progresses and the amount of data stored in the buffer memory decreases to a predetermined amount, reading of the digital audio signal from the disk is restarted.

However, in the case where the digital audio signal is intermittently read from the disk as described above, when the reading of the digital audio signal from the disk is restarted, the rotation control, the focus control, and the tracking control of the disk are performed. Must follow the same procedure as when starting playback. That is, when the reading of the digital audio signal from the disk is resumed, the rotation control, focus control, and tracking control of the disk are performed from the beginning, so that the digital audio signal can be read from the disk satisfactorily. take time. That is, it takes time to start up.

Considering the start-up time, a problem arises in that a buffer memory having a large storage capacity must be used, and a substantial pause time for reading the audio signal from the disk cannot be long. Further, when the focus control, the tracking control, and the rotation control of the disk are started (at startup), the power consumption becomes large, and it is not possible to realize sufficient power saving.

In particular, in the case of a portable disk drive, since the drive power is supplied from the battery, it is necessary to reduce the power consumption and extend the life of the battery to extend the drivable time. This is an important problem that leads to improved usability in the field.

[0014] In view of the above, an object of the present invention is to provide a device for reading data from a disk recording medium, which can eliminate the above-mentioned problems and can surely reduce power consumption.

[0015]

According to a first aspect of the present invention, there is provided an apparatus for reading data from a disk recording medium, comprising: a reading unit for reading data recorded on a disk recording medium; A servo control unit that servo-controls a controlled unit such as a drive control unit of a medium or a control unit that controls a reading state of the reading unit on the disk recording medium, and a buffer memory; A data reading device that writes data read from a recording medium into the buffer memory at a first transfer rate and reads data from the buffer memory at a second transfer rate lower than the first transfer rate. To determine whether data has been written to the full storage capacity of the buffer memory. Detecting means for detecting, and when the detecting means detects that data has been written to the full storage capacity of the buffer memory, the reading means stops reading data from the disk recording medium. The read stop control means for controlling, and the read stop control means, when reading of data from the disk recording medium by the read means is stopped, stop supply of drive power to each part that does not need to operate or Drive power supply adjusting means for reducing,
In the reading stop state, the remaining amount detecting means for detecting whether the amount of data stored in the buffer memory has decreased to a predetermined amount and the remaining amount detecting means are stored in the buffer memory. When it is detected that the data amount has decreased to a predetermined amount, the control unit controls the drive power supply adjustment unit to restart the supply of the drive power to each unit where the supply of the drive power is stopped or reduced. Read restart control means for restarting reading of data from the disk recording medium by the reading means.

According to the apparatus for reading data from a disk recording medium according to the first aspect of the present invention, the data recorded on the disk recording medium is read out by the reading means and temporarily stored in the buffer memory. Are read from the buffer memory and reproduced. That is, the data recorded on the disk recording medium is:
It is reproduced via the buffer memory.

At this time, the processing speed of reading data from the disk recording medium and writing to the buffer memory is set to be faster than the processing speed of reading data from the buffer memory.

When the data read from the disk recording medium is stored by the detecting means to the full storage capacity of the buffer memory, the reading stop control means stops reading of the data from the disk recording medium by the reading means. Is done. In addition, the supply of the driving power is stopped or reduced by the driving power adjusting means for each unit that does not need to operate when the data reading is stopped.

After the supply of the driving power is stopped or reduced by the driving power adjusting means, the remaining amount detecting means detects that the data storage amount of the buffer memory has been reduced to a predetermined amount. The drive power supply control means is controlled by the read resumption control means, the supply of drive power is stopped or reduced, the supply of drive power to each section is restarted, and the reading means resumes reading data from the disk recording medium. To be.

As described above, when the reading operation is stopped, the supply of the driving power to each unit that does not need to operate is stopped or reduced, so that power consumption can be reduced.

According to a second aspect of the present invention, there is provided an apparatus for reading data from a disk recording medium according to the first aspect of the present invention, wherein the reading stop control means controls the disk recording by the reading means. When reading of data from the medium is stopped, the servo control unit includes a holding unit that holds information indicating a state of servo control, the read restart control unit,
The servo control by the servo control means is started based on the information indicating the state of the servo control held in the holding means.

According to the apparatus for reading data from a disk recording medium according to the second aspect of the present invention, the servo in the servo control means when the reading of data from the disk recording medium is stopped by the reading stop control means. Information indicating the control state is held in the holding means. When the reading of data from the disk recording medium is resumed, the servo control in the servo control means is performed by the read restart control means based on the information indicating the servo control state at the time of stopping the reading held in the holding means. Is started, and the state of the servo control can be quickly drawn into a good state.

As described above, when the reading of data from the disk recording medium is resumed, the servo control by the servo control means is started based on the information indicating the state of the servo control held in the holding means. Does not take much time until data can be read from the disk recording medium, and the reading can be started quickly. Therefore, the time required to start up the reading means does not take a long time, so that the reading suspension period can be extended, so that the power consumption can be reduced. Further, power consumption does not increase when reading is resumed.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an apparatus for reading data from a disk recording medium according to the present invention; In the embodiment described below, the present invention is applied to a compact disc (C
An example in which the present invention is applied to the portable reproducing device D) will be described.

FIG. 1 is a block diagram for explaining a portable reproducing apparatus (hereinafter simply referred to as a reproducing apparatus) for a compact disk according to this embodiment. FIG. 2 is an external view of the reproducing apparatus according to this embodiment. FIG.

The reproducing apparatus according to this embodiment is a so-called portable reproducing apparatus which is reduced in size and weight and is easy to carry. As shown in FIG. 2, the reproducing apparatus according to this embodiment has a casing slightly larger than a compact disc, loads a compact disc in the casing, and reproduces an audio signal recorded on the loaded compact disc. And output.

A display 21 and a key group 22 are provided on the front surface of the housing of the reproducing apparatus of this embodiment, as shown in FIG. The display 21 displays, for example, the total playing time of the compact disc 1 loaded in the reproducing apparatus, the track number of the music being played, and the like. The key group 22 includes various keys such as a power key, a play key, a pause key, a stop key, and a music selection key for inputting instructions to the playback device.

An output terminal 11 for an audio signal is provided on a side surface of the reproducing apparatus according to this embodiment. By connecting headphones or speakers to the output terminal 11, it is possible to listen to the sound reproduced and output by the reproducing device.

As shown in FIG. 1, the reproducing apparatus of this embodiment includes a spindle motor 2, an optical pickup 3, a thread 4, a servo circuit 5, a reproduction signal processing section 6, a control signal processing section 7, a memory controller 8, a buffer memory 9, an output signal generation unit 10, an audio signal output terminal 11, a power supply circuit 12, switch circuits 13 and 14, and a system controller 20. System controller 20
Is connected to the display 21 and the key group 22 described above.

The compact disk 1 is rotated by a spindle motor 2. The rotation of the spindle motor is controlled by the servo circuit 5 so that the compact disk 1 is controlled to rotate at a constant linear velocity.

The optical pickup 3 is driven by a thread 4
The movement of the compact disk 1 in the radial direction is controlled. The servo circuit 5 controls the focus and tracking of the optical pickup 3.

The system controller 20 includes a CPU 20
1, a microcomputer provided with a ROM 202 and a RAM 203, and manages the overall operation of the playback apparatus of this embodiment.

The playback apparatus of this embodiment temporarily stores the digital audio signal read from the compact disc 1 in the buffer memory 9 and reads the digital audio signal stored in the buffer memory 9 as described later. To play.

Thus, through the buffer memory 9,
By reproducing the digital audio signal from the compact disc 1, for example, even if a track jump occurs in which the reproduction position jumps due to disturbance such as vibration during reproduction, a sound break or the like can be generated. Absent.
While the digital audio signal stored in the buffer memory 9 is being reproduced, the scanning position of the laser beam from the optical pickup 3 on the compact disc 1 is returned to the target track, and the reproduction of the digital audio signal is continued. It is made to be able to.

The reading of the digital audio signal from the compact disk 1 and the writing of the read digital audio signal to the buffer memory 9 are faster than the reading speed when reading the digital audio signal from the buffer memory 9. Is set to

When the digital audio signal read from the compact disc 1 is written to the full storage capacity of the buffer memory 9, the compact disc 1
Stop reading digital audio from. Thereafter, the reading of the digital audio signal from the buffer memory 9 proceeds, and when the accumulated amount of the digital audio signal in the buffer memory 9 becomes equal to or less than a predetermined amount, the reading of the digital audio signal from the compact disc 1 is restarted. I do.

As described above, the playback apparatus of this embodiment intermittently reads digital audio signals from the compact disc 1. The reproducing apparatus according to the present embodiment performs a read processing unit during a period in which the reading of the digital audio signal from the compact disc 1 is stopped during the reproducing in which the reading of the data from the compact disc 1 is performed intermittently. By stopping the supply of the driving power to the 10 predetermined portions, power consumption is reduced.

Further, as will be described later in detail, when the reading of the digital audio signal from the compact disc 1 is restarted, the reading can be quickly resumed, and the restart of the digital audio signal from the compact disc 1 is performed. At times, power consumption is prevented from increasing.

[Operation During Reproduction] In the reproduction apparatus of this embodiment, as shown in FIG. 1, a switch circuit 13 is provided between the power supply circuit 12, the reproduction signal processing section 6, and the control signal processing section 7. , 14 are provided. These switch circuits 13 and 14 are controlled to be turned on (closed state) by the system controller 20 before the reproduction processing is started in the reproduction device of this embodiment.

When the compact disk 1 is loaded into the reproducing apparatus of this embodiment, and the reproducing keys of the key group 22 are operated, the system controller 20 controls the power supply circuit 12 to operate the reproducing apparatus. Driving power is supplied to each unit to start the reproduction process.

In accordance with the control from the system controller 20, the spindle motor 2
The rotation speed is controlled to a constant linear speed by the servo circuit 5 based on a signal from the compact disk 1. Also,
Laser light from optical pickup 3 is compact disc 1
Is irradiated. The optical pickup 3 detects a focus error by, for example, an astigmatism method by detecting reflected light of a laser beam applied to the target track, and also detects a tracking error by, for example, a push-pull method, and detects a tracking error by a push-pull method. R based on the reflected light of
Outputs F signal.

The output of the optical pickup 3 is supplied to a reproduction signal processing section 6 and a control signal processing section 7. The control signal processing unit 7 extracts a focus error signal or a tracking error signal from the output of the optical pickup 3 and supplies the signal to the servo circuit 5.

The servo circuit 5 controls the focus of the optical system of the optical pickup 3 so that the focus error signal from the control signal processing unit 7 becomes zero, and controls the optical system so that the tracking error signal becomes zero. The tracking control of the optical system of the pickup 3 is performed.

As described above, when the start of the reproducing process is instructed, the compact disc 1 is irradiated with the laser beam from the optical pickup 3 and the compact disc 1 is rotated by the spindle motor 2. And
A focus error signal, a tracking error signal, and rotation control information of the compact disc 1 are obtained from the reflected light of the laser beam from the compact disc 1, and the servo circuit 5 controls the focus coil and the tracking coil of the optical pickup 3. A control signal, a tracking control signal, and a rotation control signal for controlling the rotation of the spindle motor 2 are formed.

The optical pickup 3 is controlled by these control signals.
The laser beam from the optical pickup 3 scans the target track satisfactorily and appropriately, and converts the digital audio signal recorded on the compact disc 1 into a reproduction RF signal. It can be read.

The reproduction signal processing unit 6 extracts a digital audio signal recorded on the compact disc 1 from the reproduction RF signal from the optical pickup 3, performs necessary processing such as error correction, and converts it into a memory controller. 8 The memory controller 8 writes the digital audio signal from the reproduction signal processing unit 6 into the buffer memory 9.

If there is no track jump in which the reproduction position jumps due to vibration or the like during reproduction, the memory controller 8 operates the buffer memory 9 as described above.
Thus, the data is sequentially read at a speed lower than that at the time of writing, for example, at a transfer speed of about １ ／ times the writing speed, and the read data is supplied to the output signal generation unit 10.

In this case, the memory controller 8 can control writing / reading of the buffer memory 9 so that the amount of data stored in the buffer memory 9 does not fall below a predetermined value.

When it is detected that a track jump has occurred during the reproduction, the writing of the data from the reproduction signal processing unit 6 to the buffer memory 9 is stopped, and the data from the buffer memory 9 to the output signal generation unit 10 is output. Only transfer data. Then, when the reproduction position is corrected, control is performed to restart the data writing from the reproduction signal processing unit 6 to the buffer memory 9.

The output signal generator 10 is provided with a buffer memory 9
The digital audio signal read out from the digital audio signal is subjected to a predetermined process such as decompression processing to form an analog output audio signal. This analog output audio signal is output through the output terminal 11.

As described above, the processing speed of reading data from the compact disk 1 and writing the read data to the buffer memory 9 is faster than the reading speed when reading data from the buffer memory 9. Set up fast.

Therefore, the memory controller 8 constantly monitors the amount of data stored in the buffer memory 9, and the system controller 20 can know the amount of data stored in the buffer memory 9 through the memory controller 8. Has been. Thus, when data is written to the full storage capacity of the buffer memory 9 or when the amount of data stored in the buffer memory 9 becomes smaller than a predetermined data amount, the system controller 20 transmits the data through the memory controller 8. Detect.

In this embodiment, when the system controller 20 detects that data has been completely written into the buffer memory 9, the system controller 20 sends information indicating the rotation control status at that time, focus Information indicating the state of control and information indicating the state of tracking control are acquired, and these are temporarily stored in the RAM 203 of the system controller 20.

The system controller 20 controls the servo circuit 5 to stop reading data from the compact disk 1 and to switch the switch circuit 1
By turning off 3 and 14 (opened state), the supply of drive power to the reproduction signal processing unit 6 and the control signal processing unit 7 is stopped. Further, the laser beam emitted from the optical pickup 3 is turned off.

Thereafter, when the system controller 20 detects that the data storage amount of the buffer memory 9 has been reduced to the predetermined or stored amount by reading the data from the buffer memory 9 through the memory controller 8. The system controller 20 turns on the switch circuits 13 and 14 to restart the supply of the drive power to the reproduction signal processing unit 6 and the control signal processing unit 7, and also turns on the laser light source of the optical pickup 3 through the servo circuit 5. Then, the compact disc 1 is irradiated with laser light.

As described above, the system controller 20 temporarily stores the information indicating the rotation control state, the focus control state, and the tracking control state of the spindle motor 2 temporarily stored in the RAM 203 before the stop. Is supplied to the servo circuit 5, and based on the information indicating the state of these controls, the rotation control of the spindle motor,
The focus control and the tracking control are returned to the state immediately before the stop.

As a result, the states of the spindle motor 2, the focus coil and the tracking coil of the optical pickup 3 are quickly returned to the state immediately before the stop. That is, as described above, the rotation control of the spindle motor,
Without performing a startup process that gradually brings the focus control and tracking control to a good state,
The state of the rotation control, focus control and tracking control of the spindle motor is restored to the state immediately after the reading of data from the compact disk 1 is stopped because the data in the buffer memory 9 is full, and the compact disk 1 is quickly restored. The digital audio signal can be read well.

FIG. 3 is a diagram for explaining the transition of the amount of data in the buffer memory 9 and the intermittent read processing of data from the compact disc 1 in the reproducing apparatus of this embodiment in association with each other. In FIG. 3, the vertical axis indicates the amount of data in the buffer memory, and the horizontal axis indicates time. Mf on the horizontal axis indicates the full storage capacity of the buffer memory 9, and Mr indicates the predetermined remaining memory capacity.

In the case of the reproducing apparatus of this embodiment, as shown in FIG. 3, the reproducing process is started, and the data read from the compact disc 1 is written into the buffer memory 9 and the data is read from the buffer memory 9. At time A when the data is read and the data is written to the full storage capacity of the buffer memory 9, the reading of the data from the compact disc 1 and the writing of the read data to the buffer memory 9 are stopped.

At this time, the supply of drive power to the reproduction signal processing unit 6 and the control signal processing unit 7 is stopped, and the laser light from the optical pickup 3 is turned off. In addition, information indicating states such as the rotation control, focus control, and tracking control of the spindle motor 2 is temporarily stored in the RAM 203 of the system controller 20.

Since data is continuously read from the buffer memory 9 at a constant rate, the amount of data stored in the buffer memory 9 decreases at a constant pace. When the amount of data in the buffer memory 9 decreases to the predetermined remaining memory amount Mr, reading of data from the compact disk 1 and writing of the read data to the buffer memory 9 are restarted.

That is, in FIG. 3, the process of reading data from the compact disc 1 and restarting the writing of the read data to the buffer memory 9 from time B is started. At the time of this resumption,
Since the spindle motor 2 and the optical pickup 3 are controlled based on information indicating the state of the rotation control, focus control, tracking control, and the like of the spindle motor 2 stored immediately before the stop, the first start-up immediately after the reproduction instruction is issued. Reading of the digital audio signal recorded on the compact disc 1 can be resumed more quickly than at the time.

In this embodiment, the process of reading data from the compact disc 1 is restarted at time B. However, in practice, the state of the spindle motor 2 and the optical pickup is adjusted and time C is read. Thus, the data read from the compact disc 1 is written to the buffer memory 9.

As described above, when reading data from the compact disk 1 and restarting the process of writing the read data to the buffer memory 9, the RAM 2
Since the rotation control, focus control, and tracking control of the spindle motor 2 can be quickly brought into a good state based on the information indicating the state of the servo control stored in the disk 03, the data is actually read from the compact disk 1. Thus, it is possible to reduce the time required to start writing the data in the buffer memory 9, that is, the time from time B to time C in FIG.

For this reason, the value of the memory remaining amount Mr of the buffer memory 9 set in advance can be set small, so that the time from time A to time B can be made long in FIG. For example, the time during which reading of data from the compact disc 1 is stopped, such as turning off the laser, can be lengthened, and power consumption can be reduced.

At the time of restart, the rotation control, focus control, and tracking control of the spindle motor are quickly brought into an appropriate state, so that the power consumption required at the time of pulling in, that is, starting up can be reduced.

Further, at the time of the stop, the supply of the driving power to the reproduction signal processing unit 6 and the control signal processing unit 7 is stopped, and the laser light from the optical pickup 3 is also turned off. Can be done.

As described above, as a whole, the factor that increases the power consumption can be eliminated, so that the power consumption can be surely reduced and the life of the battery used in the reproducing apparatus can be prolonged. Thereby, the usability of the portable playback device of this embodiment can be improved.

Next, the processing at the time of reproduction by the reproduction apparatus of this embodiment will be described with reference to the flowchart of FIG.

As described above, when the compact disk 1 is loaded into the reproducing apparatus in this embodiment, and the reproduction key is pressed to instruct reproduction, the system controller 20 supplies drive power to each section. A start-up operation is performed (step 101). That is, this step 10
The start-up operation of 1 is to irradiate the compact disc 1 with laser light from the optical pickup 3 and control the spindle motor 2, the focus coil and the tracking coil of the optical pickup 3 based on information obtained from the reflected light, This is an operation (process) for properly reading data from the compact disk 1.

When the start-up operation is completed, a digital audio signal is read from the compact disc 1 by the optical pickup 3 (step 102), and the read digital audio signal is written to and read from the buffer memory 9 (step 103). ), The digital audio signal recorded on the compact disc 1 is reproduced via the buffer memory.

Then, the system controller 20 obtains the amount of data stored in the buffer memory through the memory controller 8, and determines whether or not the data has been written to the buffer memory 9 to its full storage capacity (step 10).
4). When it is determined in the determination processing of step 104 that the data is not stored in the full storage capacity of the buffer memory 9, the processing from step 102 is repeated.

In the determination process of step 104, when it is determined that the data has been stored to the full storage capacity of the buffer memory 9, in this embodiment, the system controller 20 sends the focus control, tracking control, The information indicating the state of the rotation control of the spindle motor is obtained and stored in the RAM 203 (step 105).

Then, the system controller 20 stops reading the digital audio signal from the compact disc 1, turns off the switches 13 and 14, and
The laser beam from the optical pickup 3 is also turned off (step 106). After this stop, the reading of data from the buffer memory 9 is continued (step 107).
Then, the system controller 20 obtains the amount of data stored in the buffer memory 9 through the memory controller 8, and determines whether the amount of data stored in the buffer memory 9 has become equal to or less than a predetermined amount (step 10).
8).

If it is determined in step 108 that the amount of data stored in the buffer memory 9 is not less than the predetermined amount, the processing from step 107 is repeated.

When it is determined in step 108 that the amount of data stored in the buffer memory 9 has become equal to or less than the predetermined amount, the system controller 20 turns on the switch circuits 13 and 14 and turns on the drive power supply. And the irradiation of the laser beam from the optical pickup 3 is restarted. And step 10
In step 5, information indicating the state of each of the focus control, tracking control, and rotation control of the spindle motor stored in the RAM 203 is supplied to the servo circuit 5, and the focus control, tracking control, and rotation control of the spindle motor are performed from the compact disk 1. The data is resumed from the read state immediately before the stop of the data read (step 10
9) After the digital audio signal has been successfully read from the compact disc 1, the processing from step 102 is repeated.

As described above, by intermittently reading data from the compact disk 1, the supply of drive power to the read processing unit 10 can be saved during stoppage and the optical power can be saved, as described above. Since the laser light from the pickup 3 is also turned off, power consumption can be reduced.

At the time of resumption, the rotation control, focus control, and tracking control of the spindle motor are quickly brought into an appropriate state. Data reading can be resumed. Further, since the start-up time can be shortened, the period during which data reading from the compact disc 1 is stopped can be extended, and power consumption does not increase at the time of start-up. Can be reduced.

In the above-described embodiment, information indicating the state of each of the focus control, the tracking control, and the rotation control of the spindle motor is temporarily stored in the RAM 203 of the system controller 20. May be provided in the servo circuit 5 and stored in the memory provided in the servo circuit 5. In this case, the servo circuit 5 includes the system controller 2
From 0, information indicating the state of each control is read from its own memory when a restart instruction for reading data from the compact disk 1 is received, and each unit is quickly returned to the read state immediately before the stop based on the information. What should I do?

In the above-described embodiment, when reading data from the compact disc 1 is stopped for intermittent reproduction at the time of reproduction, the drive to the reproduction signal processing unit 6 and the control signal processing unit 7 is performed. Although the power supply is stopped, the present invention is not limited to this. For example, the supply amount of the drive power may be reduced.

In this case, the power consumption can be reduced to some extent, and the reproduction signal processing unit 6 and the control signal processing unit 7 can be started up quickly.

In the above-described embodiment, the drive power supply to the reproduction signal processing unit 6 and the control signal processing unit 7 is
The case where the operation is stopped by the switch circuits 13 and 14 has been described as an example. However, the present invention is not limited to this. Can be stopped or the supply amount can be reduced.

Further, in the above-described embodiment, a case has been described where the present invention is applied to a compact disc reproducing apparatus. However, the present invention is not limited to this. For example,
Readout data is reproduced and output through a buffer memory, such as a reproducing apparatus or recording / reproducing apparatus using an MD (mini disc) as a recording medium, or a DVD (digital video disk) reproducing apparatus or a recording / reproducing apparatus. The present invention can be applied to various data reproducing devices and recording / reproducing devices.

[0084]

As described above, according to the apparatus for reading data from a disk recording medium according to the first aspect of the present invention, when the reading is stopped, the supply of the driving power to the components that do not need to operate is stopped. Alternatively, power consumption can be reduced, so that power consumption can be saved.

According to the apparatus for reading data from a disk recording medium according to the second aspect, when resuming the reading of data from the disk recording medium, the information based on the information indicating the state of the servo control held in the holding means is provided. Since the servo control by the servo control means is started, it does not take much time until the reading means can read data from the disk recording medium, and reading can be started quickly. As a result, it does not take much time to start up the reading means, etc.
Since the read suspension period can be lengthened, power consumption can be reduced. Further, it is possible to prevent the power consumption from increasing when reading is resumed.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an embodiment of an audio signal processing device according to the present invention.

FIG. 2 is an external view of the audio signal processing device shown in FIG.

FIG. 3 is a diagram for explaining states of writing and reading data to and from a buffer memory, and timings for stopping and restarting reading of data from a disk;

FIG. 4 is a flowchart for explaining an operation at the time of a reproduction process of an audio signal in a reproduction device which is the audio signal processing device of the embodiment.

[Description of Symbols] 1 ... CD (Compact Disc), 2 ... Spindle Motor, 3 ... Optical Pickup, 4 ... Thread, 5 ... Servo Circuit, 6 ... Reproduction Signal Processing Unit, 7 ... Control Signal Processing Unit, 8 ... Memory Controller , 9: buffer memory, 10: output signal generator, 11: output terminal, 12: power supply circuit, 13, 1
4 switch circuit, 20 system controller, 21
... Display, 22 ... Key group, 201 ... CPU, 20
2 ... ROM, 203 ... RAM

Claims (2)

[Claims] 1. A read-out unit for reading data recorded on a disk recording medium, and a controlled unit such as a drive control unit for the disk recording medium and a control unit for controlling a reading state of the reading unit on the disk recording medium. A servo control unit for servo-controlling the unit; and a buffer memory, wherein the reading unit writes the data read from the disk recording medium at a first transfer rate to the buffer memory, and from the buffer memory,
What is claimed is: 1. A data reading device for reading data at a second transfer rate lower than said first transfer rate, comprising: detecting means for detecting whether data has been written to a full storage capacity of said buffer memory; Means for controlling to stop reading data from the disk recording medium by the reading means when it is detected that data has been written to the full storage capacity of the buffer memory, A drive power supply adjusting unit that stops or reduces the supply of drive power to each unit that does not need to operate when the read stop control unit stops reading data from the disk recording medium by the read unit; When reading is stopped, the amount of data stored in the buffer memory is determined in advance. A remaining amount detecting means for detecting whether or not the amount of data stored in the buffer memory has been reduced to a predetermined amount. Controlling the drive power adjusting means,
Read restart control means for restarting the supply of drive power to each unit in which the supply of drive power is stopped or reduced, and restarting reading of data from the disk recording medium by the reading means. A device for reading data from a disk recording medium. 2. The information processing apparatus according to claim 1, wherein said read stop control means includes means for holding information indicating a state of servo control in said servo control means when reading of data from said disk recording medium by said read means is stopped. Wherein the read resumption control means starts the servo control by the servo control means based on the information indicating the state of the servo control held in the holding means. 2. An apparatus for reading data from a disk recording medium according to claim 1.