JP3421885B2 - Playback device, recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device and a reproducing device capable of recording or reproducing data on a disc-shaped recording medium.

[0002]

2. Description of the Related Art For example, a magneto-optical disk (MO disk)
In a reproducing device and a recording device that use an optical disc as a recording medium, there is a demand to reduce power consumption as much as possible. This demand is particularly great for small portable devices that supply power from an internal battery.

Here, in a reproducing apparatus using a mini disk or a compact disk as a recording medium, for example, the data read from the recording medium by the optical head is temporarily stored in a buffer memory, the data is read from the buffer memory at a predetermined timing, and the data is read. There is one that is adapted to be converted into a reproduced sound signal and output.

In such a configuration, the bit rate for supplying the data read from the optical head to the buffer memory is set higher than the bit rate for reading the data from the buffer memory. That is, in this case, although the data writing to the buffer memory is executed at a high speed so that the data reading from the buffer memory is always executed, the optical head is constantly stored in the buffer memory by a certain amount during the reproducing operation. It means that the data read from is accumulated. As a result, even if the data reading operation from the recording medium by the optical head is temporarily disabled due to, for example, a track jump caused by disturbance or the like, the reproduced sound is continuously output without interruption.

In such a reproducing apparatus, the operation of the optical head and the signal system from the optical head to the buffer memory is
Even if data is written to the buffer memory at a high rate, the data is intermittently supplied so as not to supply more data than the remaining writable capacity of the buffer memory. And
While the data is not actually supplied to the buffer memory, the optical head is controlled in a so-called pause (temporary stop) state and stands by until the next data read timing.

While the optical head is not reading data from the disk, the optical head, the servo system, the demodulation system up to the buffer memory, etc. may be turned off even if the optical head is not always waiting in the pause state. I do not care. Therefore, considering the reduction of power consumption as described above, when the optical head, the servo system, the demodulation system up to the buffer memory, etc. are in the standby state according to the storage capacity of the buffer memory, the power supply to these parts is reduced. It is preferable to execute power saving processing such as stop of supply and stop of operation clock.

[0007]

By the way, a power saving mode is provided as a system operation, and power saving processing is executed for an optical head, a servo system, a demodulation system up to the buffer memory, etc. according to the storage capacity of the buffer memory. If set to, the following problems will occur.

First, in the power saving mode, even if an access operation is performed while the optical head, the servo system, and the demodulation system are in the power-off state, it cannot be dealt with immediately and a quick access operation becomes impossible. In other words, since the same processing as the startup processing from the normal power-off state is required for the servo system even though the audio or the like is actually being played back, the access operation is executed. The time from when the sound is output to the user feels long.

Further, in order to save power, when power saving processing is performed during standby in the intermittent operation, it is meaningless unless the power saving period is continued for a certain time.
Therefore, it is necessary to set the waiting period to some extent longer.
However, this means that it is not possible to perform fine data reading because the amount of storage in the buffer memory is close to the full capacity at almost all times.
That is, since the data storage amount may be considerably reduced in each power saving period, the risk of stability of the reproduction operation (continuous audio output operation) increases.

[0010]

In view of such problems, the present invention devises the execution timing of the power saving operation so that the recording / reproducing operation performance is not hindered. To aim.

Therefore, the data transfer system has a storage means for temporarily storing the data, and at the time of recording or reproducing the data, according to the data storage amount in the storage means.
A power saving mode operation is performed in a recording or reproducing apparatus in which a data writing operation or a data reading operation with respect to a recording medium is performed intermittently. The power saving mode operation is a predetermined time during a data recording or reproducing operation, and during a period in which a data writing operation or a data reading operation is not performed on the recording medium according to the data storage amount in the storage means. To enable operation control for reducing power consumption for a part .

Then, the judgment means capable of judging the error occurrence frequency relating to the data writing operation or the data reading operation, and the power control means when the judgment operation of the judging means judges that the possibility of the error occurrence is high. And a control means for prohibiting execution of operation control for reducing power consumption.

[0013]

By including the power control means having the above structure,
It can reduce power consumption and extend battery life. If the error frequency is high, the operation
Emphasis on maintaining stability and not shifting to power saving mode
By doing so, a situation such as unplayable may occur
Try to avoid as much as possible.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. This embodiment is a recording / reproducing apparatus using a magneto-optical disk as a recording medium, and FIG. 1 shows a block diagram of a main part of the recording / reproducing apparatus.

As shown in FIG. 1, in this recording / reproducing apparatus, a recording / reproducing data transfer system for a magneto-optical disk is roughly classified, and a data writing / reading unit for writing / reading data to / from the magneto-optical disk. 30, a data temporary storage unit 40 for temporarily accumulating read data or input data for writing, a recording / reproducing signal processing unit 5 for performing audio compression processing and conversion of analog signals and digital signals.
Broadly divided into 0.

Reference numeral 1 denotes, for example, a magneto-optical disk on which audio data is recorded, which is loaded in the data writing / reading unit 30 and is rotationally driven by the spindle motor 2. An optical head 3 irradiates the magneto-optical disk 1 with a laser beam during recording / reproduction, which provides a high level laser output for heating the recording track to the Curie temperature during recording, and the magnetic Kerr effect during reproduction. It provides a relatively low level laser power for detecting data from reflected light. For this reason, the optical head 3 is equipped with a laser diode as a laser output means, an optical system including a polarization beam splitter and an objective lens, and a detector for detecting reflected light. The objective lens 3a is held by the biaxial mechanism 4 so as to be displaceable in the disc radial direction and the direction in which the disc moves toward and away from the disc.

Reference numeral 6a denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, which is arranged at a position facing the optical head 3 with the magneto-optical disk 1 in between. The entire optical head 3 and the magnetic head 6a are movable in the disk radial direction by the sled mechanism 5.

Information detected from the magneto-optical disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 calculates a reproduction RF signal, a tracking error signal, a focus error signal, groove information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 1) and the like by calculating the supplied information. Extract. Then, the extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error signal and the focus error signal are supplied to the servo circuit 9, and the groove information is supplied to the address decoder 10.

The servo circuit 9 drives various servos based on the supplied tracking error signal, focus error signal, track jump command, access command, rotation speed detection information of the spindle motor 2, etc. from the system controller 11 composed of a microcomputer. A signal is generated to control the biaxial mechanism 4 and the sled mechanism 5 to perform focus and tracking control, and to control the spindle motor 2 to a constant linear velocity (CLV).

The reproduced RF signal is sent to the encoder / decoder unit 8
In EFM demodulation, decoding processing such as CIRC is performed, and the data is sent to the data temporary storage unit 40. That is, the memory controller 1
It is once written in the buffer RAM 13 according to 2. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduced data in the system from the optical head 3 to the buffer RAM 13, that is, the data writing / reading unit 30 are 1.41 Mbit / sec, and intermittently. Done.

The data written in the buffer RAM 13 is read out at a timing at which reproduction data is transferred at 0.3 Mbit / sec and sent to the recording / reproduction signal processing section 50.
That is, it is supplied to the encoder / decoder unit 14. Then, a reproduction signal process such as a decoding process for the audio compression process is performed, an analog signal is formed by the D / A converter 15, and the analog signal is supplied from a terminal 16 to a predetermined amplification circuit section and reproduced and output. For example, it is output as L and R audio signals.

Here, writing / reading of data to / from the buffer RAM 13 during reproduction is performed by being addressed by the memory controller 12 under the control of the write pointer and the read pointer. FIG. 3 conceptually shows an operation of writing / reading data to / from the buffer RAM 13, and it is assumed that addresses 0 to n are provisionally set as areas for data in the buffer RAM 13. Actually, the buffer RAM 13 holds TOC data for controlling the recording / reproducing operation in addition to the audio signal data, so that a storage area other than the audio signal data is also set.

As shown in FIG. 3 (a), the write pointer W and the read pointer R are sequentially incremented from address 0 to address n, and the address 0 is re-addressed after the address n. It is controlled in a so-called ring form that is reset to. Then, when the reproducing operation is started and the data is read from the magneto-optical disk 1 by the data writing / reading unit 30 and is supplied to the data temporary storage unit 40, as shown in FIG. W is sequentially incremented, and data is written to each address accordingly. Further, at almost the same time (or when the data is accumulated to some extent), the read pointer R is also sequentially incremented, whereby data is read from each address and supplied to the encoder / decoder unit 14. Go.

Here, the write pointer W is as described above.
Since the read pointer R is incremented at a timing of 1.41 Mbit / sec, and the read pointer R is incremented at a timing of 0.3 Mbit / sec, the address indicated by the write pointer W is read at a certain point as shown in FIG. It catches up with the address indicated by the pointer R (when the read pointer R is the address x, the address of the write pointer W is x−
1). That is, the data is stored in the buffer RAM 13 in full capacity. At this time, the increment of the write pointer W is stopped, and the data write / read unit 3
The data read operation from the magneto-optical disk 1 by 0 is also stopped. However, since the read pointer R is continuously incremented, the reproduced voice output is not interrupted.

After that, it is assumed that only the read operation is continued from the buffer RAM 13 and the data storage amount N in the buffer RAM 13 becomes below a set predetermined amount at a certain point as shown in FIG. 3 (d). . Here, the data reading operation and the increment of the write pointer W by the data writing / reading unit 30 are restarted again, and are executed until the address of the write pointer W catches up with the address of the read pointer R again. As described above, the data writing / reading unit 30
The data writing operation of the reproduction data in the buffer RAM 13 is performed intermittently.

This operation relationship is shown in FIGS. 2 (a) to 2 (c). Note that FIG. 2D shows the accumulated amount N of the buffer RAM 13.
Is shown. As shown in FIGS. 2A and 2B, t
If the reproducing operation is started at time 0, the data writing / reading unit 30 starts reading the data from the magneto-optical disk 1 and storing it in the buffer RAM, and immediately after that, the data reading / reading unit 30 reads the data from the buffer RAM 13 and outputs the sound signal. Playback output is started. Then, at time t1, the buffer R
Assuming that the data storage amount N of the AM 13 becomes full (FIG. 2C), the data reading operation from the magneto-optical disk 1 and the storage operation in the buffer RAM 13 are stopped at that time,
After that, the process is not executed until the time T2 when the data storage amount decreases to the level of N2. And from the time of T2,
The data read / write operation by the data write / read unit 30 and the storage operation in the buffer RAM 13 are executed until T3 when the data storage is full again.

By outputting the reproduced sound signal via the buffer RAM 13 as described above, the reproduced sound output is not interrupted even if the tracking is missed due to a disturbance or the like, and the data accumulation remains. By accessing the correct tracking position and restarting the data reading, the operation can be continued without affecting the reproduction output. That is, the seismic resistance function can be significantly improved.

In FIG. 1, address information output from the address decoder 10 and subcode data used for control operation are supplied to the system controller 11 via the encoder / decoder unit 8 and used for various control operations. . Further, the lock detection signal of the PLL circuit that generates the bit clock for the recording / reproducing operation and the monitor signal of the missing state of the frame synchronization signal of the reproduction data (L and R channels) are also supplied to the system controller 11.

Further, the system controller 11 outputs a laser control signal SLP for controlling the operation of the laser diode in the optical head 3, controls the output of the laser diode on / off, and at the time of on-control, the laser power The output at the time of reproduction, which is a relatively low level, and the output at the time of recording, which is a relatively high level, can be switched.

When the recording operation is performed on the magneto-optical disk 1, the recording signal (analog audio signal) supplied to the terminal 17 is converted into digital data by the A / D converter 18, and then the encoder. / It is supplied to the decoder unit 14 and subjected to audio compression encoding processing. The recording data compressed by the encoder / decoder unit 14 is temporarily buffered by the memory controller 12 in the buffer RAM 1
3 is read out at a predetermined timing and sent to the encoder / decoder unit 8. Then, the encoder / decoder unit 8 performs encoding processing such as CIRC encoding and EFM modulation, and then supplies the magnetic head driving circuit 6. As the operation of the buffer RAM 13 at the time of recording, the data from the encoder / decoder unit 14 is continuously written by the write pointer W, while
The read pointer R is incremented intermittently at a high rate. That is, the write pointer W and the read pointer R
The operation of is roughly the opposite of that during playback.

The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the N or S magnetic field is applied to the magneto-optical disk 1 by the magnetic head 6.
At this time, the system controller 11 also supplies a control signal to the optical head so as to output a laser beam of a recording level.

Reference numeral 19 denotes an operation unit provided with keys used for user operation, and 20 denotes a display unit composed of, for example, a liquid crystal display. The operation unit 19 is provided with a play key, a stop key, an AMS key, a search key and the like so as to be operated by the user. Reference numeral 21 is a power saving mode switch for allowing the user to select execution / non-execution of a power saving mode described later.

Reference numeral 22 is a power supply circuit for supplying an operating power supply VDD to each part, and uses a battery (dry battery, rechargeable battery) 24 housed as a power supply, and an AC adapter is connected to an AC terminal 23 to use a commercial AC power supply. be able to. Information indicating whether or not external power is supplied from the AC terminal 23 is used as the signal SDC in the system controller 11
Is supplied to. The signal SDC may normally be the output of the voltage comparator. This signal SDC causes the system controller 11 to use the battery 2 as a power source during operation.
It is possible to determine whether or not 4 is used. Reference numeral 25 denotes a G sensor, which detects the external vibration level applied to the recording / reproducing apparatus and supplies the information to the system controller 11.

The operation relating to the power saving mode realized by the embodiment having such a configuration will be described below. The basic operation when the power saving mode is executed is as follows.
Only the data writing / reading unit 30 is turned off.

At the time of reproduction, t1 in FIG.
During the period from to t2, the data writing / reading unit 30 is not operated. That is, the buffer RAM 13
During such a period in which the data writing / reading unit 30 is made to stand by according to the remaining amount N of the power consumption, the system controller 11 controls the data writing / reading unit 30 to perform power down control by the power saving control signal SPOF. ing. As a power-down control method, a switch is provided on the power supply line for each part of the data writing / reading unit 30 and is turned off to stop the power supply, or a switch for each part of the data writing / reading unit 30 is provided. It is conceivable to stop the supply of the operating clock. Alternatively, a system in which an operation stop command is supplied from the system controller 11 and the servo circuit 9 and the encoder / decoder unit 8 stop the operation based on the command may be used. Even during recording, the data writing / reading unit 30 is powered down while the data writing / reading unit 30 is on standby. However, at the time of recording, the waiting period is a period until the saved amount N of the buffer RAM 13 increases from 0 to a certain amount.

In this way, by significantly powering down the data writing / reading unit 30 in the power saving mode, remarkable power saving is realized. For example, when operating using the battery 24, it is more than doubled. A long life can be realized.

However, in the power saving mode, there is usually no problem, but there is a delay in the operation at the time of access, the start-up time of the data writing / reading unit 30 and the storage amount N of the buffer RAM 13.
Since there are more chances that there will be less sound, there is a higher risk of sound breaks during playback. In other words, considering the performance for maintaining normal operation, the power saving mode causes a slight decrease.

Therefore, in the present embodiment, the system controller 11 gives a predetermined condition for executing the power saving mode and limits the execution. The following are set as conditions.

When the external power source is used, the power saving mode is not set. This is because it is meaningless to save power when the power is supplied through the AC adapter. The power-off of the data writing / reading unit 30 during standby is not executed.

The power saving mode switch 21 that does not enter the power saving mode according to the user's selection allows the user to select whether to execute the power saving mode. In other words, it is selectable between a case where the user attaches importance to operational stability and a case where the user wants to execute long-time driving by the battery 24. For example, the user selects the non-execution of the power saving mode when there are many access operations or when it is desired to eliminate the interruption of sound as much as possible, while the user selects the execution of the power saving mode when the user carries it for a long time. To be able to.

When the user who does not enter the power saving mode within a certain period of time after performing the access operation performs the access operation, it does not mean, for example, that the user is listening to the music being played, but the desired song. Even if you are looking for it, there is a high possibility that you will repeatedly perform access operations for this purpose. That is, immediately after an access operation is performed, there is a high possibility that the access operation will be continuously executed. In such a case, in order not to reduce the access speed, the buffer RAM is kept for a predetermined time.
The power saving mode operation is not executed regardless of the accumulated amount of 13. For example, about 10 seconds after the access operation is a standby period in which the power saving mode operation is not executed.

If an error is likely to occur, the power saving mode is not set. If there are many read errors and write errors due to a vibrating environment or scratches on the disk, read and write retry operations are performed. Since the quick response is required, it is inappropriate that the data writing / reading unit 30 is in the power-off state. Conversely, if the data writing / reading unit 30 is in the power-off state in such a case,
This may easily cause a break in the reproduced voice. Therefore, if the G sensor 25 detects that the vibration level is high, or if the frequency of out-of-focus or tracking out-of-order due to disturbance or scratches on the disk is high, it is determined that an error is likely to occur, The power saving mode operation is not executed regardless of the amount of data stored in the buffer RAM 13. In addition, as a method to judge that the error occurrence probability is high, it is judged by detecting the error rate and increasing it, or by counting the number of retries and increasing the frequency. Good.

Of the above conditions, first, the processing of the system controller 11 according to the conditions 1 to 3 will be described with reference to the flowchart of FIG. At the time of recording / reproducing, the system controller 11 first determines whether the power supply circuit 22 is currently using the external power supply from the AC terminal 23 or the battery 24 as a process of step F101 based on the signal SDC. When the external power supply is used, the power saving mode is not executed due to the above conditions, so the routine proceeds to step F103 and becomes the normal processing. That is, the data writing / reading unit 30 is not powered off during the standby period, but is in a paused state, for example.

If the battery 24 is used,
From step F101 to F102, the power saving mode switch 21
Determine the state of. The power saving mode switch 21 is in the off state when the user does not execute the power saving mode. Therefore, under the above conditions, the process proceeds to step F103 and becomes the normal process. The power saving mode switch 21 is in the ON state when the user wants to execute the power saving operation. Therefore, step F104
Then, the process advances to step S3 to monitor the accumulated amount N of the buffer RAM 13. The system controller 11 has a buffer RAM 13
The storage amount N can be obtained by communication with the memory controller 12 or calculation of the write pointer W and the read pointer R.

First, the case where the storage amount N of the buffer RAM 13 has not reached N1 in FIG. 2 is the case where the data writing / reading unit 30 is not in the standby period. Therefore, the power of the data writing / reading unit 30 cannot be turned off. Therefore, when N <N1, the routine proceeds to step F103 and becomes the normal processing.

If N ≧ N1 is determined in step F104, the time T after the key (AMS key, FF / REW key, playback key) for executing the access operation is pressed in step F105. The predetermined time T1 set in advance is compared. The time T is the time counted by the internal timer by the system controller 11 from the time of the access operation. The predetermined time T1 is set to 10 seconds, for example. During the period of T <T1, that is, within 10 seconds after the access operation, there is a high possibility that the access operation will be performed again. Therefore, based on the above conditions, if T <T1, the process proceeds to step F103 and becomes the normal process.

When the accumulated amount N of the buffer RAM 13 is N1 or more and T ≧ T1 is satisfied, the data writing / reading unit 30 can enter the standby state. Therefore, in step F106, the system controller 11 executes a power-off process on the data writing / reading unit 30 to control the data writing / reading unit 30 into a so-called sleep state.

When the data writing / reading unit 30 is in the sleep state during reproduction, only reading is performed on the buffer RAM 13, and the remaining amount of data gradually decreases as shown in FIG. 2 (c). The system controller 11 monitors the storage amount N of the buffer RAM 13 and displays N2 shown in FIG.
It is determined whether or not it has decreased. The accumulated amount N is N2
When the data writing / reading unit 30 has reached, the data writing / reading unit 30 must restart its operation. Therefore, after returning to Step F101, the normal processing of Steps F102 and F104 is repeated and the data writing / reading unit 30 It is started up and a predetermined operation is executed. By such processing, as described above,
The power saving mode operation is executed after the conditions of and are satisfied.

Next, the processing of the system controller 11 for satisfying the above conditions is shown in FIGS. FIG. 5 is a main routine for executing a power-off process for the data writing / reading unit 30 as a power saving mode operation,
FIG. 6 shows a routine as an interrupt process executed at regular time intervals.

In the main routine of FIG. 5, first, in step F201, the power saving prohibition flag DNGON is determined. The power saving prohibition flag DNGON is a flag for prohibiting execution of the power saving mode operation for the data writing / reading unit 30 according to the above conditions. The power saving prohibition flag DNGON is turned on / off by the interrupt processing of FIG. Is set by.

When the power saving prohibition flag DNGON = “H”, the system controller 11 does not perform the power saving control on the data writing / reading unit 30 regardless of the storage amount N of the buffer RAM 13. In this case, the process proceeds to step F202 and thereafter, and if the focus is not in the on state, the process of turning on the focus is performed (F202, F203). For example, when the data writing / reading unit 30 is first started up, or when the focus is lost due to disturbance or the like, this focus pull-in process is performed. At this time, the counter FCNT is incremented in step F204, particularly as processing relating to the power saving mode. The counter FCNT serves as a counter that counts how many times the focus pull-in control is performed, that is, it can be used to determine whether out-of-focus frequently occurs due to the influence of disturbance or the like.

Step F205 shows normal processing. That is, since the power saving mode is not executed under the above conditions, the data writing / reading unit 30 is not powered off during the standby period, but is in a pause state, for example.

When a data read error or a data write error occurs during reproduction / recording in normal processing, a read or write retry is performed for the error.
(F206, F207). Here, as a process related to the power saving mode, the counter ECNT is incremented in step F208. The counter ECNT serves as a counter that counts the number of error occurrences, that is, it can be used to determine whether or not a data error frequently occurs due to the influence of disturbance or scratch.

Power saving prohibition flag DNGON = in step F201
If it is determined to be “L”, the system controller 11
Will execute the power saving mode operation according to the accumulated amount in the buffer RAM 13. That is, buffer R in step F209
The accumulated amount N of AM13 is determined. The case where the accumulated amount N of the buffer RAM 13 has not reached N1 in FIG. 2 is the case where the data writing / reading unit 30 has not entered the standby period. Therefore, the power of the data writing / reading unit 30 cannot be turned off. Therefore, if N <N1, the process proceeds to step F202 and thereafter to be the normal process.

If N ≧ N1 is determined in step F209, it means that the data writing / reading unit 30 can enter the standby state. Therefore, in step F210, the system controller 11 executes a power-off process on the data writing / reading unit 30 and the data writing / reading unit 30.
Control the so-called sleep state.

When the data writing / reading unit 30 is in the sleep state during reproduction, only reading is performed on the buffer RAM 13, and the remaining amount of data gradually decreases as shown in FIG. 2 (c). System controller 11 step
The accumulated amount N of the buffer RAM 13 is monitored by F211.
It is determined whether or not it has decreased to N2 shown in FIG.
When the accumulated amount N reaches N2, the data writing / reading unit 30
Must restart the operation. Therefore, after returning to step F201, the process proceeds to steps F209, F202, F203, F204, and F205 to return to the normal processing, and the data writing / reading unit 30 is started up to a predetermined level. Will be executed.

FIG. 5 shows the processing according to the state of the power saving prohibition flag DNGON, and the power saving prohibition flag DNGON is a flag reflecting the above conditions. The power saving prohibition flag DNGON is set by the interrupt processing in FIG. In the interrupt processing at regular time intervals, the counter IRQCNT is first incremented (F301). The counter IRQCNT serves as a counter that counts the number of interrupt processes. Next, the output of the G sensor 25 is determined (F302), and when the G sensor output value V is larger than the predetermined value V1, that is, when the influence of the disturbance is large, the counter GCNT is incremented (F303).

Then, in step F304, the counter IRQCNT is compared with the predetermined value M, and if it is smaller than the predetermined value M, the process ends (F305). In other words, the power-saving prohibition flag DNGON is set according to the usage environment and error frequency determination during the interrupt process executed M times or more, and the interrupt process exceeds M times. Step F3
We will proceed to 06.

First, in step F306, the value of the counter GCNT is compared with the predetermined value G1. The value of the counter GCNT is the number of times that the G sensor output was at a high level of V1 or higher in the M interrupt processings. By comparing this with the predetermined value G1, it is determined whether the current usage environment is in a state of much disturbance. It is determined whether or not. When counter GCNT> predetermined value G1, it is determined that there is a large amount of disturbance, that is, the possibility of error occurrence is high. That is, in this case, the above conditions are met, and the process proceeds to step F310, where the power saving prohibition flag DNGON is set to "H".

If the value of the counter GCNT is smaller than the predetermined value G1, then in step F307, the counter FCNT is compared with the predetermined value F1. The counter FCNT is a counter that counts how many times defocus occurs due to the influence of disturbance, etc. If this value is larger than the predetermined value F1, there are many disturbances and scratches on the disk, that is, an error occurs. It is considered highly likely. That is, also in this case, the above condition is satisfied, and the process proceeds to step F310, where the power saving prohibition flag DNGON is set to "H".

If the value of the counter FCNT is smaller than the predetermined value F1, then in step F308 the counter ECNT is compared with the predetermined value E1. The counter ECNT is a counter that counts how many times a data error has occurred due to, for example, tracking error due to disturbance or scratches. If this value is larger than the predetermined value E1, an error occurs. It is considered highly likely. In this case as well, the above conditions are met, and the process proceeds to step F310, where the power saving prohibition flag DNGON is set to "H".

If a negative result is obtained in all of steps F306, F307, and F308, it is determined that the possibility of error occurrence is low at present. In this case, the above conditions are not satisfied, and the process proceeds to step F309. The power saving prohibition flag DNGON is set to "L". When the power saving prohibition flag DNGON is set in step F309 or F310, each counter (GCNT, FCNT,
ECNT, IRQCNT) are cleared and the process returns to the main routine (F
312).

By the processing shown in FIGS. 5 and 6, the power saving mode operation is executed while satisfying the above conditions. By executing this processing and the processing of FIG. 4 in combination, the power saving mode operation can be executed while satisfying the conditions (1) to (3). As a result, when the operational stability is important, the power-off of the data writing / reading unit 30 in the standby state is not executed, and the occurrence of reproduction or recording error is prevented as much as possible. On the other hand, when importance is attached to the battery life, or in a situation where it is considered that an error hardly occurs, the power saving operation is executed. Therefore, in this embodiment, the optimum operation is performed according to the usage situation and the usage situation of the user.

In the above-mentioned embodiment, the example in which the present invention is adopted in the recording / reproducing apparatus has been described, but a reproducing-only apparatus or a recording-only apparatus may be used. Further, the present invention can be applied not only to the magneto-optical disk but also to a reproducing apparatus compatible with an optical disk such as a CD and a DAT (digital audio tape). In other words, the present invention can be adopted as long as a buffer memory is provided in the subsequent stage of the data reading means and double-speed reading from, for example, a CD or DAT is performed so that a certain amount of data is always accumulated in the buffer memory.

[0065]

As described above, according to the present invention, in the device capable of reducing the power consumption by performing the power saving mode operation and extending the battery life, when the external power source is used for the operation. The power saving mode operation is not executed when the user attaches great importance to operation stability, when the access operation is likely, and when the error occurrence probability is high. For this reason, the battery life is extended by the power saving mode operation as much as possible, and the operation stability and access performance are not unnecessarily hindered by limiting the execution opportunity of the power saving operation under a predetermined condition. Therefore, it is possible to obtain the effect of not lowering the performance during use.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of write / read operation timing of the buffer RAM according to the embodiment.

FIG. 3 is an explanatory diagram of write / read operations of the buffer RAM according to the embodiment.

FIG. 4 is a flowchart of execution determination of a power saving mode operation according to the embodiment.

FIG. 5 is a flowchart of execution determination of a power saving mode operation according to the embodiment.

FIG. 6 is a flowchart of execution determination of a power saving mode operation according to the embodiment.

[Explanation of symbols]

1 Magneto-optical disk 3 Optical head 8,14 Encoding / decoding section 9 Servo circuit 11 System controller 12 Memory controller 13 Buffer RAM 21 Power saving mode switch 22 Power circuit 23 AC terminal 24 batteries 25 G sensor 30 Data writing / reading section 40 data temporary storage 50 Recording / playback signal processing unit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-19915 (JP, A) JP-A-4-152413 (JP, A) JP-A-2-61721 (JP, A) JP-A-5- 11934 (JP, A) JP 60-55421 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 3/06-3/08 G11B 20/10-20/16 G06F 1/00

Claims (2)

(57) [Claims] 1. A reproducing means for intermittently reproducing data recorded in track units on a recording medium, a storage means for temporarily accumulating the data intermittently reproduced by the reproducing means, and the reproducing means. Storage control means for storing the data reproduced intermittently in the storage means at a predetermined writing speed and reading the data accumulated in the storage means at a reading speed slower than the writing speed, and the storage means. A power control means for stopping the power supply to at least the reproducing means when the accumulated data amount exceeds a predetermined amount, and a judgment for judging an error occurrence frequency during data reproduction from the recording medium by the reproducing means. Means for stopping the power supply to the reproducing means by the power control means when the error occurrence frequency becomes equal to or more than a predetermined amount by the determining operation of the determining means and the determining means. Reproducing apparatus characterized in that it comprises a control means. 2. A storage means for temporarily storing input digital data, the input digital data is stored in the storage means at a predetermined writing speed, and the data stored in the storage means is written in the storage means. A storage control means for intermittently reading at a read speed faster than the loading speed, a recording means for intermittently recording the data read from the storage means on a recording medium, and a predetermined amount of data accumulated in the storage means. Until the above, at least the power control means for stopping the power supply to the recording means, the determination means for determining the error occurrence frequency during the data recording on the recording medium by the recording means, and the determination operation of the determination means Control means for prohibiting the stop of the power supply to the recording means by the power control means when the error occurrence frequency exceeds a predetermined amount. A recording device characterized by the above.