JPH11296994A - Optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk reproducing device capable of reducing power consumption. SOLUTION: This optical disk reproducing device is provided with an error correcting means 15 for correcting an error of a signal reproduced from an optical disk 1, a temporary storage means 16 for storing temporarily a reproduced signal error-corrected, and a data residual quantity control means 23 for controlling data quantity stored in the temporary storage means 16 to expand and output a reproduced signal temporarily stored after error correction. When the data residual control means 23 detects an interval from reaching a first level of the data quantity to reaching a second level, a control means 27 controls suppressing supply of power to the error correcting means 15. Thereby, power consumption of a whole device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an MD (Mini)
Disc), MD2, Video CD (Compact D)
isc), high quality video CD, CD-R, CD-RW,
DVD (Digital Versatile Dis)
c), DVD video, DVD audio, DVD-RO
M, DVD-R, DVD-RAM, DVD-R / W, D
The present invention relates to a reproducing apparatus for reproducing information from an optical disk such as VD + RW, MO, etc., and in particular, to reduce power consumption in an apparatus having temporary storage means for temporarily storing data for performing compression / expansion or for shock proofing. Regarding technology that can.

[0002]

2. Description of the Related Art Generally, in a portable reproducing apparatus for an optical disk such as a CD, a DVD, and an MD, for example, an MD portable reproducing apparatus, a capacity of about 4 MB for storing an information amount corresponding to a reproduction time of about 10 seconds. It has a shock-proof memory, and utilizes the temporary storage of data in this memory, for example, while a music signal is being reproduced from the memory, the pickup is kicked between tracks and then reproduced. Waiting for rotation for power sector. Also, for example, a DVD playback device also has a temporary storage memory having a capacity of about 4 MB or about 16 MB, and sequentially stores playback information in this memory at a high transfer rate of a variable transfer rate while temporarily storing the playback information. After reading, the pickup is kicked between tracks, and a rotation signal is sent to a sector to be reproduced next. In this case, since the transfer speed is high, the storage capacity of 4 MB corresponds to a reproduction time of about 0.5 seconds, and the storage capacity of 16 MB corresponds to a reproduction time of about 2 seconds.

[0003]

On the other hand, in the case of a portable type optical disk reproducing apparatus as described above, the power consumption of the entire apparatus is reduced in order to extend the use time of the battery as much as possible. Various proposals have been made in order to suppress as much as possible. For example, JP-A-5-342
Japanese Patent Publication No. 585 proposes a mini disc reproducing apparatus in which power is saved when the amount of data in a temporary storage memory reaches a maximum (predetermined value) during reproduction of information from a disc. In this case, the memory capacity is 4 MB, and power is saved only for 10 seconds. The memory may be a fixed time management, and detailed time management is not required. Therefore, the circuit block for saving power may be provided at one predetermined location, and the processing at the time of restart can be dealt with by one method. However, in practice, when the type of the optical disk, the type of the reproduction signal, and the like are different, the time in which the temporary storage memory data is stored may be different, and the recovery time must be fixedly determined in anticipation of the maximum safe time. did not become. Therefore, the effect of reducing power consumption was not so great. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problems effectively. It is an object of the present invention to provide an optical disk reproducing apparatus capable of further reducing power consumption.

[0004]

The inventor of the present invention has conducted intensive studies on the reduction of power consumption, and has found that during the period during which data writing to the temporary storage means used for shock proof or data compression / expansion is prohibited, data writing is required. The present invention has been made based on the finding that by suppressing power supply to a part where power is supplied, power consumption as a whole can be reduced. That is, according to the invention defined in claim 1, an error correction means for error-correcting a reproduction signal reproduced from an optical disk, a temporary storage means for temporarily storing the error-corrected reproduction signal, and a method for temporarily storing the error-corrected reproduction signal. An optical disk playback device comprising: a data remaining amount management unit that manages the amount of data stored in the storage device; and an output device that expands and outputs a temporarily stored error-corrected playback signal. When a period from when the signal reaches the first level to when the signal reaches the second level is detected, at least a control unit that performs control for suppressing power supply to the error correction unit is provided.

[0005] As a result, the information read from the optical disk by the pickup means is subjected to predetermined signal processing and error processing, then stored in the temporary storage means, and is read and reproduced little by little. Once the reading from the temporary storage means is started, the reading is continued until reading of all the data of a certain file is completed, whereas the temporary storage means has the first storage data amount. When the minimum level (empty) is reached, reading from the optical disc side is started, and when the maximum level (full) is reached, the reading is temporarily interrupted. doing. Then, while the reading of information from the optical disk is interrupted, the power supplied to all of the signal processing means and all of the data correction means is suppressed (including stoppage of supply), thereby suppressing power consumption. . During this time, the reproduction of the data from the temporary storage means is continuously performed.

Further, the invention as defined in claim 2 comprises a driver means for driving and controlling a pickup means for reproducing an optical disk, a reproduction / servo means for obtaining a reproduction signal and a servo error signal from a signal obtained by the pickup means. A tracking control unit for performing tracking control of the pickup unit; an error correction unit for correcting an error in the reproduction signal; a temporary storage unit for temporarily storing the error-corrected reproduction signal; and a temporary storage unit. Data remaining amount management means for managing the data amount,
An optical disk reproducing apparatus for expanding and outputting a temporarily stored reproduction signal after error correction, wherein the data remaining amount management unit performs a period from when the data amount reaches a first level to when the data amount reaches a second level. Is detected, a control unit for performing control to suppress power supply to at least the error correction unit and the tracking control unit is provided.

Further, the invention as defined in claim 3 is a first control means for controlling the rotation of the optical disk based on a speed signal obtained from a driving means for rotating the optical disk, Second control means for controlling the rotation of the optical disc based on the obtained speed signal, driver means for driving and controlling a pickup means for reproducing the optical disc, and a reproduction signal and a servo error signal from a signal obtained by the pickup means. Reproduction / servo means, focus control means for performing focus control on the pickup means, tracking control means for performing tracking control on the pickup means, error correction means for performing error correction on the reproduction signal, and reproducing the error-corrected reproduction signal. Temporary storage means for temporarily storing, and storage in the temporary storage means An optical disk playback device comprising: a data remaining amount management unit that manages the amount of data stored in the storage device; When a period from when the first level reaches the first level to when the second level is reached is detected, the rotation control of the optical disk by the second control means is switched to the rotation control of the optical disk by the first control means. And at least a control unit for performing control for suppressing power supply to the error correction unit, the tracking control unit, and the focus control unit.

Further, in addition to the control operation defined in claim 3, control for suppressing power supply to the laser generation means and the reproduction / servo control means may be performed. Claim 4
The invention defined in (1) is a driver for controlling the rotation of the optical disc, the laser generating means and the pickup means, a reproducing / servo means for obtaining a reproduction signal and a servo error signal from a signal obtained by the pickup means,
A servo block for sending a servo signal to the driver means based on an output of the servo means, an error correction means for correcting an error in the reproduction signal, a temporary storage means for temporarily storing the error-corrected reproduction signal, and the temporary storage An optical disk playback device comprising: a data remaining amount management unit that manages an amount of data stored in the unit; and an optical disk playback device that expands and outputs a temporarily stored error-corrected playback signal that is stored therein. When the data amount is detected from when the data amount reaches the first level to when the data amount reaches the second level, a control means for controlling the power supply to each of the means and the blocks is provided. In this case, a plurality of types of modes for power control are preferably determined in advance.

For example, as set forth in claim 5, there is provided speed detecting means for detecting a reproduction speed of the reproduction signal, and the control means suppresses power supply based on a detection result of the speed detecting means. And a timing for returning to the normal mode may be determined, or a signal type detecting means for determining a type of the reproduction signal may be provided, as defined in claim 6. The means may perform control for suppressing power supply based on the determination result of the signal type detection means and determine timing for returning to the normal mode, or the optical disk as defined in claim 7. A disc type discriminating means for discriminating the type of the disc. The control means performs control for suppressing power supply based on the discrimination result of the disc type discriminating means. It is also possible to determine the timing to return to the normal mode. Alternatively, a signal type determining means for determining a type of the reproduction signal, and a linear velocity determining means for determining a linear velocity of the optical disk based on a result of the determination by the signal type determining means. The control means performs control to suppress power supply based on the determination result of the signal type determination means and the determination result of the linear velocity determination means, and determines a timing for returning to the normal mode. It may be.

According to this, according to the reproduction speed of the reproduction signal, the type of the reproduction signal, the type of the disk, the linear velocity of the disk, etc., it is possible to minimize the power consumption within a range that does not adversely affect the reproduction operation. It is possible to select a possible mode (power saving mode).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical disk reproducing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of a reproducing apparatus according to the present invention, FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical disk, and FIG. The graphs shown in FIGS. 4 and 5 are flowcharts showing the operation of the apparatus of the present invention.

First, as shown in FIG. 2, the configuration of the optical disk 1 is such that the recording surface is concentrically divided into a plurality of areas, in the illustrated example, an inner area A and an outer area B. A track (not shown) is formed concentrically or spirally on the entire recording surface. Here, the optical disk 1 has a linear velocity (CLV: Constant Linear).
Since the rotation is controlled at a constant (Verocity), one round in the inner area A is divided into four sectors, for example, and one round in the outer area B is divided into eight sectors, for example. The rotation cycle is 40 msec when the pickup means described later is located in the inner area A, and 80 m when the pickup means is located in the outer area B.
sec.

Next, the reproducing apparatus will be described with reference to FIG. In the figure, reference numeral 2 denotes a spindle motor for rotating the optical disk 1, reference numeral 3 denotes a laser generating means for generating laser light for reading information, and reference numeral 4 denotes a pickup means for detecting reflected light of the laser light applied to the optical disk 1. In addition, the laser generating means 3 and the pickup means 4 are integrally moved in the radial direction of the optical disc 1 by the driving mechanism 5. Reference numeral 6 denotes a reproduction / servo signal generation unit that generates a reproduction signal and a servo signal from the signal read out by the pickup unit 4 and a speed signal for CLV control, and includes a laser power control circuit (APC). This includes a focus signal generation circuit, a tracking error signal generation circuit, a reproduction signal generation circuit, an equalizer circuit, a PLL circuit, a speed signal generation circuit, and the like. Reference numeral 7 denotes a servo block, which includes a focus control unit 8, a tracking control unit 9, and the like. Reference numeral 10 denotes driver means for operating the pickup means 4 and the spindle motor 2, and includes a focus circuit 11, a tracking circuit 12, and the like.

Reference numeral 13 denotes reproduction / servo signal generation means 6
A / that converts the reproduction signal from the analog to digital
Reference numeral 14 denotes a signal processing unit, which converts, for example, a reproduced signal into an EFM (Eight to Fourth) signal.
(en modulation) + signal to NRZ data. Reference numeral 15 denotes an error correction means,
An error correction process is performed on the decoded reproduced signal. Here, the error-corrected data signal is a signal compressed at a variable transfer rate. Reference numeral 16 denotes a temporary storage means such as a DRAM having a storage capacity of 4 MB, and stores the compressed data to absorb the time axis of the variable transfer rate. Reference numeral 17 denotes expansion means composed of, for example, an A (audio) -V (video) decoder, and expands the compressed data. Reference numeral 18 denotes a separation unit, which separates both the audio signal and the video signal when the expanded data includes the audio signal and the video signal. Reference numerals 19 and 20 denote D / A converters, which output respective signals as an audio signal and a video signal. Reference numeral 21 denotes a speaker, and reference numeral 22 denotes a monitor.

Reference numeral 23 denotes data remaining amount management means for managing the amount of data stored in the temporary storage means 16, and reference numeral 24 denotes a timer.
A predetermined time, for example, a time of 400 msec, is measured from the time when writing to the memory cell 6 is prohibited. Reference numeral 25 denotes a reproduction sector storage unit, which stores a sector number to be reproduced next. Reference numeral 26 denotes an input unit, which is used when an operator inputs a necessary command. Reference numeral 27 denotes a control means composed of, for example, a microcomputer or the like, which controls the operation of the entire apparatus.

Next, the operation of the apparatus configured as described above will be described. First, the reproduction signal of the optical disk 1 read by the pickup means 4 is input to the reproduction / servo signal generation means 6, where the reproduction signal, the servo signal and the speed signal are generated. The generated servo signal is input to the servo block 7, based on which the focus control means 8 generates a focus error signal, and the tracking control means 9 generates a tracking signal. Then, the focus error signal and the tracking signal are input to the driver means 10, and the focusing circuit 11 performs the focus control and the tracking circuit 12 performs the tracking control based on the respective signals to the pickup means 4. Thereby, the pickup means 4
Is performed for one round of servo control.

The speed signal is obtained by a PLL circuit included in the reproducing / servo signal generating means 6. The speed signal is input to the spindle control means 30 of the servo block 7, and the spindle signal is generated based on the speed signal. The control means 30 generates a spindle control signal, and
To the spindle circuit 31. Thus, the spindle circuit 31 performs CLV control by controlling the rotation of the spindle motor 2. Further, a rotation position signal of a hall element or the like (not shown) of the spindle motor 2 is fed back to the spindle control circuit 30, and a speed signal generated from this signal is used to calculate a fixed rotation FG (Frequency).
y Generator) control. The reproduction signal from the pickup means 4 has its frequency characteristics optimized by an equalizer of the reproduction / servo signal generation means 6, and can be subjected to PLL.

The reproduced signal is further converted into a digital signal by the A / D converter 13 and input to the signal processing means 14. Synchronization detection is performed from this digital signal, and based on this, the NR is calculated from the EFM + signal on the disk.
Decoded to Z data. The decoded signal is input to the error correction means 15, where the signal is subjected to error correction processing to obtain a sector address signal and a data signal. Since this data signal is a signal compressed at a variable transfer rate, it is temporarily stored in the temporary storage means 16 to absorb the time axis of the variable transfer rate. Also, C
In some cases, uncompressed signals are recorded on D or DVD audio discs, but also when the transfer rate of audio and video signals is lower than that of signals read from the disc. Similarly, the temporary storage means 16
Is performed. This temporary storage means 1
The signal read from 6 is expanded by expansion means 17 comprising an AV decoder, and further separated by a separation unit 18 into an audio signal and a video signal. Each signal is converted into an analog signal by the D / A converters 19 and 20, and is output as an audio signal and a video signal, respectively.

The operation of the temporary storage means 16 will now be described in detail. The storage means 16 has a storage capacity of, for example, 4 MB as described above.
500msec when transfer rate is 8Mbps in VD
This corresponds to a time information amount of about c, and therefore, even if the time for one round of the track is 80 msec, it corresponds to a time margin of about six tracks of the track. In FIG. 3, each predetermined value of the second level of the data storage amount and the empty of the first level is set in consideration of a certain margin, and the full value is set to 100%. 0% empty
It does not mean. The data amount of the temporary storage means 16 at this time is monitored by the data remaining amount management means 23.

As shown in FIG. 3, when the reproduction of information from the sector at a predetermined position on the optical disc 1 is started by the pickup means 4 in the temporary storage means 16, each of the tracking and focus errors described above is stored. After performing error processing in monitoring and signal processing, writing is sequentially started (area a). Then, when the storage amount exceeds the empty level, reading from the temporary storage means 16 and decompression operation by the decompression means 17 are started (area b). Thereafter, the reading and decompressing operations are continuously performed until there is no more data in the file. The reading speed from the optical disk 1 is, of course, faster than the reading speed from the temporary storage means 16.

Then, the reproduction signal from the pickup means 4 is written until the data storage amount of the temporary storage means 16 becomes full. When the data storage amount becomes full, writing of data to the temporary storage means 16 is prohibited. (Region c). Then, until the data storage amount becomes empty (this is usually performed by time calculation), the track kick is performed so that the pickup means 4 comes to the sector to be reproduced, and then the apparatus stands by. The next sector number to be reproduced at this time is stored in the reproduction sector storage unit 25. In this manner, thereafter, the writing of information from the optical disk 1 to the temporary storage means 16 and the writing prohibition are repeatedly performed.

The above operation is the operation of a conventional general reproducing apparatus. Here, in the present invention, the power supply to the parts unnecessary for the operation is cut off only for a time period of about 400 msec, for example, in the c region of about 500 msec waiting for rotation. . This 400ms
The time ec is measured by the timer 24 in FIG. That is, when the data storage amount of the temporary storage unit 16 is detected to be full, the timer 24 is operated to
00 msec is measured, and the apparatus enters a power saving mode in which power supplied to unnecessary parts is cut only during the 400 msec c1 area. When 400 msec has elapsed, the mode is returned from the power save mode to the normal mode (c2 area).

The power saving mode can take, for example, the following three modes. <Aspect 1> First, as an aspect 1, it is necessary not to affect the servo control and to prevent this processing from being hindered because the stored data is read from the temporary storage unit 16. Therefore, the signal processing means 14
Then, the power supplied to the error correction means 15 is cut to cut off all the power, that is, the synchronization detection processing, the EFM + conversion processing, and the power supplied to the error correction means 15, and the entire error correction processing is interrupted. Also, the control of writing to the temporary storage unit 16 is interrupted. Thereby, the power consumption of the entire apparatus is suppressed. Further, as for the servo system, after elapse of 400 msec in the kick waiting state, the supply of the power is restored to return to the normal kick waiting state.

<Aspect 2> As an aspect 2, in addition to the operation of the above aspect 1, only the tracking control is turned off with the focus control being applied. Here, the sector to be reproduced next is, of course, stored in the reproduction sector storage unit 25. When the tracking control is off, 100% of the signal cannot be obtained.
In the V control mode, the signal component of the RF signal is intermittently extracted, and the process shifts to a CLV rough servo that generates a speed signal. As power saving, a part of the reproduction / servo signal generation means 6, for example, a tracking error signal generation circuit and a part of the servo block 7, for example, the tracking control means 9
Then, the power supplied to a part of the driver means 10, for example, the tracking circuit 12, is cut off. This makes it possible to further reduce the power consumption as compared with the case of the first aspect. Since the tracking control is turned off in the servo system, after 400 msec elapses, the power supply is restored, the tracking control is turned on, the sector address there is detected and stored, and the normal sector to be kicked is detected. And return to the kick waiting state.

<Aspect 3> As an aspect 3, in addition to the operation of the above-described aspect 1, the focus control and the tracking control are turned off. Here, the sector to be reproduced next is, of course, stored in the reproduction sector storage unit 25. Then, in the off state of the focus control and the tracking control, no reproduction signal is obtained, and the control cannot be performed in the CLV control mode of the spindle motor 2, so that the control shifts to the FG mode control. In particular, since the current sector is known here,
The control means 27 sets the rotation speed of the FG corresponding to this, and sets the rotation speed of the FG of constant rotation. As the power saving, all of the reproduction / servo signal generation means 6 (that is, laser power control circuit (APC), focus signal generation circuit, tracking error signal generation circuit, reproduction signal generation circuit, equalizer circuit, PLL circuit, speed signal generation Circuit), and all of the servo blocks 7 (that is, focus control means 8 and tracking control means 9).
And a part of the driver means 10 (ie,
The power supply to the focusing circuit 11 and the tracking circuit 12) is cut. As a result, it is possible to further reduce the power consumption as compared with the case of the second aspect. As the servo system, since the focus control and the tracking control are turned off, the timer 24 is set to 300 msec, which is shorter than those in the first and second embodiments, with an extra margin, and after this period, the power supply is stopped. Return.
Then, the focus control is turned on, and then the tracking control is turned on. Then, the sector address there is detected, the sector is moved to the previously stored normal sector to be kicked, and then the kick wait state is returned. .

It should be noted that in each of the above aspects 1, 2 and 3, the common content is that when any input signal is received from the input unit 26 during this power saving, for example, when the video is a portable video movie, During playback, if a key input such as search or cueing occurred, or an error occurred in the sound or image being played, the necessary information was reproduced from the optical disk again. In this case, by having a means to monitor this and judging this input,
From power save state, return to normal mode immediately,
Move on to the processing corresponding to the input.

Next, the above operation will be described with reference to the flowcharts shown in FIGS. First, when reproduction of the reproducing apparatus is started, when the pickup means 4 goes to a predetermined sector where reproduction is started, reading of information is started (S11).
1), error correction of the read information data is started by the error correction means 15 (S2). Then, the storage of the error-corrected data in the temporary storage means 16 is also started (S3). Here, the data remaining amount management unit 23 monitors the data storage amount of the temporary storage unit 16 (S4), and when the data storage amount exceeds the empty level, the control unit 27 transmits the data from the temporary storage unit 16. The operation of the decompression means 17 is started at the same time as the data reading is started, and the compressed data is transferred to the decompression means
It is extended at 7 (S5).

When the data storage amount of the temporary storage means 16 becomes full (S6), at the same time, writing of data to the temporary storage means 16 is prohibited (S7), and the reproduction sector storage of the next read sector is performed. Storage in the unit 25 (S
8), transition to the power saving mode of any one of the three modes described above (S9), and the timer 24
Is started (S10). When the time set by the timer 24, for example, 400 msec has elapsed (S11), the mode is returned from the power saving mode to the normal mode (S12). Then, the pickup means 4 is moved to the stored normal sector to be kicked (S13), and a kick waiting state is set (S14). When the data storage amount of the temporary storage means 16 becomes empty (S15), the pickup means 4 is kicked to the sector to be reproduced (S16), and the above steps are repeated as long as there is data to be read. Do (S1
7). Then, when there is no more data to be read, the reproduction process ends.

In S11, it is determined whether or not there is an emergency input at all times even if the timer time has not elapsed, that is, even during the power saving mode (S1).
8) If there is an emergency input, a corresponding emergency process is performed (S19), and as a result, the reproduction process is continued or terminated. In the first embodiment described above, the application to each of the aspects 1 to 3 of the power saving mode has not been described in detail, but here, new aspects 4 to 6 similar to the above aspects 1 to 3 and the application conditions Will be described in detail with reference to the second to fourth embodiments.

First, the second embodiment corresponds to claims 4 to 6, wherein the mode of the power saving mode is selected based on the reproduction speed of the reproduction signal from the optical disk, that is, the transfer rate. FIG. 6 shows a block diagram of such a second embodiment. Here, a speed detecting means 35 is provided between the reproducing / servo signal generating means 6 and the control means 27, and the reproducing speed (transfer rate) of the reproducing signal is detected. ing. The other components are the same as those of the first embodiment shown in FIG. For example, recording type D
It is assumed that there are different types of discs having different transfer rates of reproduction signals in VD or the like, for example, depending on the type of recorded disc, as described below. Image quality is good, but overall playback time is about 2 hours
Time mode. A 4-hour mode in which the image quality is normal, but the overall playback time is about 4 hours. Image quality is poor, but overall playback time is about 6 hours
Time mode. The control signal of the disk is read out from such a variable amount of the transfer rate of the reproduction signal, and the speed detection means 35 is read.
Is determined, one of the power saving modes is selected from the three modes of the modes 4 to 6 in accordance with this.

<Aspect 4> As an aspect 4, only the tracking control is turned off with the focus control being applied. Here, the sector to be recorded next is stored in the sector storage unit 25.
Of course, it is stored. And, in the off state of the tracking control, 100% of the signal cannot be obtained.
In the CLV control mode of the spindle motor, the signal component of the RF signal is intermittently extracted to generate a speed signal.
Shift to rough servo of LV. As the power saving, a part of the recording / reproducing / servo unit 6, for example, a part of the tracking error signal generating circuit and the servo block 7, for example, a part of the tracking control unit 9 and the driver unit 10, for example, the tracking, under the control of the control unit 27. The power supply to the application circuit 12 is cut. As the servo system, tracking control is turned off, so after inputting the pause release signal,
As will be described later, when the return timing determined by the control means is reached, that is, approximately four
When 00 msec has elapsed, the power supply is restored, the tracking control is turned on, the sector address there is detected and the sector is moved to the normal sector to be kicked, whereupon the kick-back state is returned.

<Aspect 5> As an aspect 5, the focus control, the tracking control, and the laser generating means 3 are turned off.
Here, it goes without saying that the sector to be recorded next is stored in the sector storage unit 25. Then, in the off state of the focus control and the tracking control, no reproduction signal is obtained, and the control cannot be performed in the CLV control mode of the spindle motor 2, so that the control shifts to the FG mode control. Especially,
Here, since the current sector is known, the control means 27 sets the FG rotation speed corresponding to the current sector, and sets the FG rotation speed of a constant rotation. As the power saving, all of the recording / reproducing / servo means 6 are controlled by the control means 27, for example, a focus signal generation circuit, a tracking error signal generation circuit, a reproduction signal generation circuit, an equalizer circuit, a PLL circuit, a speed signal generation circuit, and a servo block. 7
, For example, the focus control unit 8, the tracking control unit 9, the traverse control unit 40, and the driver unit 1.
The power supplied to a part of 0, for example, the focus circuit 11, the tracking circuit 12, and the laser generator 3 is cut off. This makes it possible to further reduce power consumption as compared to the case of the above-described aspect 4.

Since the servo system switches off the focus control and the tracking control, as described later, when the return timing determined by the control means is reached, that is, when approximately 500 msec has elapsed since the power save mode has been entered, Restore power supply. Then, after this, the focus control is turned on after the laser generating means 3 is turned on,
Next, the tracking control is turned on, the sector address there is detected, the sector is moved to the previously stored normal sector to be kicked, and then the kick waiting state is returned. Especially,
The reason why the spindle motor 2 is not stopped here is that it takes about 2 seconds to return after stopping the spindle motor 2, and the storage time of the buffer exceeds 500 msec. However, in order to further reduce power consumption, it is a matter of course that the number of revolutions of the spindle motor in the FG mode is reduced to about 1/2 or 1/4 of the original value.

<Aspect 6> As an aspect 6, the focus control, the tracking control, the laser generating means 3 and the spindle control are turned off. Here, it goes without saying that the sector to be recorded next is stored in the sector storage unit 25. In this state, since the focus control, tracking control, laser generation means 3 and spindle control are all stopped, power consumption can be significantly reduced. However, for example, it takes about 1 second as a time to return, and a certain amount of large power is required at the time of starting the spindle motor. Therefore, for example, with a power saving time of about 6 seconds or more,
If this mode is not set, power consumption will be rather increased. As the power saving, all of the recording / reproducing / servo means 6 are controlled by the control means 27, for example, a focus signal generation circuit, a tracking error signal generation circuit, a reproduction signal generation circuit, an equalizer circuit, a PLL circuit, a speed signal generation circuit, and a servo block. 7, the power supply to all of the focus control means 8, the tracking control means 9, the spindle control means 30, and the driver means 10, for example, the focus circuit 11, the tracking circuit 12, and the spindle circuit 31 is cut off. This allows
The power consumption can be further reduced as compared with the case of the above aspect 5.

As the servo system, since the focus control and the tracking control, and the laser control means 3 and the spindle control are turned off, when the return timing determined by the control means is reached, that is, the power save mode is set, as described later. When about 1000 msec has passed since then, the power supply is restored. Then, by this, after turning on the laser generating means 3, the spindle control is turned on, then the focus control is turned on, then the tracking control is turned on, and the sector address there is detected and stored normally. Move to the sector to be kicked, and then return to the kick waiting state. Here, with reference to FIG. 7, a detailed description will be given of a change in power consumption until returning to the normal mode or the length of time in the power save mode in each of the above-described embodiments 4 to 6.

FIG. 7A shows a change in power consumption in the case of mode 4, FIG. 7B shows a change in power consumption in the case of mode 5, and FIG. This shows a change in power consumption. In the case of aspect 4 shown in FIG. 7A, only the tracking control is turned off with the focus control being applied as described above. In this case, for example, since the entire recording time is in the 2-hour mode, the image quality and the like are good, but the transfer rate is high, and the time from full to empty is 500 hours.
msec (corresponding to the area C1 + C2 in FIG. 3), which is quite short, and there are few controls that are off.
The time C2 required for the return is also short, about 100 msec. The power consumption in the power saving mode is about 80% of that in the standby mode. When returning from the power saving mode to the normal mode, when the tracking control is turned on, a large amount of power consumption (110%) is required temporarily until a predetermined track is sought, and the power returns to 100% during standby. When reading from the optical disk, 120% power consumption is required.

In the case of mode 5 shown in FIG. 7B, the focus control, tracking control and laser generating means 3 are turned off as described above. In this case, for example, since the entire recording time is in the 4-hour mode, the image quality and the transfer rate are normal, and the time from full to empty is 1 s.
ec (corresponding to the area C1 + C2 in FIG. 3)
Since the control is slightly longer than in the mode 4 and the control that is turned off is also slightly increased, the time C2 required for the return is slightly longer and is about 500 msec. The power consumption in the power saving mode is about 50% of that in the standby mode.
Is more efficient. Then, when returning from the power saving mode to the normal mode, the power is gradually restored in the order of laser on, focus control on, and tracking control on, and the power consumption gradually increases accordingly.

In the case of mode 6 shown in FIG. 7C, the focus control, tracking control, laser generating means 3 and spindle control are turned off as described above. In this case, for example, since the entire recording time is in the 6-hour mode, the image quality is poor, but the transfer rate is low, and the time from full to empty is about 2 seconds (corresponding to the area C1 + C2 in FIG. 3). Since the control time is longer and the number of controls that are turned off is further increased, the time required for recovery is further increased to about 1 second. The power consumption in the power saving mode is about 20% of that in the standby mode, which is more efficient than in the fifth embodiment. Then, when returning from the power saving mode to the normal mode, the spindle is turned on,
The power is gradually restored in the order of laser on, focus control on, and tracking control on, and the power consumption gradually increases accordingly. The amount of power reduction in each of the modes 4 to 6 is approximately 84 to the case where the power save mode is not used.
%, About 75%, and about 60%, so that power consumption can be significantly reduced within a range that does not adversely affect the reproduction operation.

To explain a specific case, for example, 4M
When the two-hour mode is set in the temporary storage means 16 of B, 8
It is assumed that an image of Mbps can be recorded and the image can be stored in the temporary storage unit 16 for a time of 0.5 sec. Then
In the case of the 4-hour mode, it is 1 sec at 4 Mbps, and in the case of the 8-hour mode, it is 2 sec at 2 Mbps. Here, if the mode 4 is selected as the low power consumption mode, the return time from the power saving mode is fixed at, for example, 100 msec. Therefore, the return timing to the normal mode is as follows. 100m
Since sec / 500 msec = 0.2, 4 MB ×
0.2 = 0.8 MB. That is, the point in time when the storage data amount becomes 0.8 MB for 4 MB may be set as the return timing, and the return operation is started from this timing. Regarding the other modes 5 and 6, the return timing is obtained by the control means 27 in a similar procedure.
The calculation shown here is a calculation when the entire storage capacity of 4 MB is used. However, in practice, a value obtained by clogging both empty and full is used with a margin. It is needless to say that the flow charts shown in FIGS. 4 and 5 are applied to the control flow in the second embodiment. In the second embodiment, the mode of the power save mode is selected according to the reproduction speed of the reproduction signal. Instead, the mode of the power save mode is selected according to the type of the reproduction signal. You may.

FIG. 8 shows a block diagram of such a third embodiment. The third embodiment corresponds to claim 7. Here, a signal type determining means 36 is provided between the reproducing / servo signal generating means 6 and the control means 27, and the type of the reproduced signal to be reproduced is determined and determined, and the determination result is input to the control means 27. doing. The other components are the same as those of the first embodiment shown in FIG. The signal type determining means 36
May be assigned to the input unit 26, and the type of input signal may be manually input from the input unit 26. Two types of reproduction signals, that is, a DVD disc that includes both a video signal and an audio signal and a case that includes only an audio signal, will be described as examples.
For example, if it is assumed that the reproduction signal includes a video signal and an audio signal and that recording is performed with high image quality, mode 4 is selected in a mode in which the transfer rate is set high, for example, 8 Mbps, and the recording time is about 2 hours. .

When the reproduction signal includes only the audio signal, the data amount is smaller than that of the video signal, and it is assumed that recording is performed with high sound quality. At the time of the mode of 8 hours, the mode 6 is selected. As described above, the control unit 27 selects one of the above-described modes 4 and 6 as the power save mode based on the signal type determination result from the signal type determination unit 36. At this time, since the return time to the normal mode differs for each mode, the return timing is calculated as a converted value of the remaining capacity of the temporary storage unit 16. In the third embodiment, the mode of the power save mode is selected according to the type of the reproduction signal. Instead, the mode of the power save mode is selected according to the type of the optical disc to be reproduced. It may be.

FIG. 9 is a block diagram of the fourth embodiment. This fourth embodiment corresponds to claim 8. Here, a disc type discriminating means 37 is provided between the pickup means 4 and the control means 27, discriminates the type of the loaded optical disc 1, and inputs the discrimination result to the control means 27. The other components are the same as those of the first embodiment shown in FIG. Disc type discriminating means 37
Discriminates the type of the optical disc 1 when it is loaded, and several methods or mechanisms have been proposed. For example, by using the fact that the amount of reflected light varies depending on the type of optical disc, an irradiation laser is used. A mechanism that detects the amount of reflected light and determines the type of the optical disc based on the detected value can be used.

Here, the type of the optical disk is D
VD disc and C that can be commonly recorded
A case where a D-RW disc is used and a video signal and an audio signal are reproduced as reproduction signals will be described as an example. For example, if the discrimination result of the disc type discriminating means 37 is D
It is determined whether the optical disk is a VD type optical disk or a CD-RW type optical disk.
Assuming that the image is reproduced with the high image quality of PEG2, mode 4 is selected in a mode in which the transfer rate is set high, for example, 8 Mbps, and the recording time is about 2 hours. Also,
If the result of the above determination is that the optical disc is a CD-RW,
Assuming that reproduction is performed with the normal image quality of MPEG1, mode 6 is selected in a mode in which the transfer rate is set low, for example, 2 Mbps, and the recording time is 1 hour.

As described above, the control means 27 selects either the mode 4 or the mode 6 as the power save mode based on the discrimination result of the disc type discriminating means 37. At this time, since the return timing to the normal mode differs for each mode, the return timing is calculated as a converted value of the remaining capacity of the temporary storage unit 16. In addition, as for the control flow in the fourth embodiment, the flowchart shown in FIG. 5 is applied.

In the above-described fourth embodiment, the mode of the power save mode is selected according to the type of the optical disk. Instead, the mode of the power save mode is selected according to the type of the reproduced signal and the linear velocity. May be selected.
FIG. 10 shows a block diagram of such a fifth embodiment. The fifth embodiment corresponds to claim 9. Here, the signal type determining means 36 and the control means 27
The linear velocity determining means 38 is provided between the control means 2 and the linear velocity of the optical disk to be set, that is, the rotational speed of the spindle motor, to be set based on the transfer rate.
7 is input. The other components are the same as those of the third embodiment shown in FIG.

Here, as an example of a reproduced signal to be reproduced, a case will be described in which a portable device reproduces a signal having a high transfer rate and a low signal of an audio signal on a DVD disk. For example, if the recording signal is linear PCM
In the case of reproducing the signals of the six channels described above, the mode 4 is set high, for example, at 8 Mbps, and in the mode in which the recording time is set to about 2 hours, mode 4 is selected. Also,
Mode 5 is selected when the reproduction signal is a mode in which the transfer rate is 2 Mbps and the recording time is about 8 hours when reproducing a two-channel signal of MPEG1.

As described above, the control means 27 controls the signal type determination result from the signal type determination means 36 and the linear velocity determination means 38.
Based on the determination result, one of the above-described modes 4 and 5 is selected as the power saving mode. For example,
When the transfer rate is low, the rotation speed of the spindle motor is reduced, that is, the linear velocity is reduced for reproduction. For example, in the case of this embodiment, when reproducing MPEG1,
The number of rotations of the disk is reduced to half that in the case of reproducing the linear PCM. In addition, since the timing of returning to the normal mode differs for each mode, the timing of the return is calculated as a converted value of the remaining capacity of the temporary storage unit 16. Here, the reason why the low-power mode is changed while the storage time of the temporary storage means 16 does not change is that the reading time from the disk is substantially doubled because the rotation speed of the disk is reduced by half. This is because the time during which the power consumption can be reduced becomes shorter as compared with the normal rotation speed. Further, as for the control flow in the fifth embodiment, it goes without saying that the flowcharts shown in FIGS. 4 and 5 are applied.

[0048]

As described above, according to the optical disk reproducing apparatus of the present invention, the following excellent operational effects can be exhibited. During playback of the playback signal from the temporary storage means used for shock proofing and data compression / decompression, power supply to unnecessary parts (circuits) is cut off while data writing to this storage means is prohibited. As a result, the power consumption of the entire apparatus can be reduced accordingly. In addition, by selecting the mode of the power save mode based on the reproduction speed of the reproduction signal, the type of the reproduction signal, the type of the optical disk to be reproduced, or the linear velocity of the optical disk to be reproduced, a range in which the reproduction operation is not adversely affected is selected. Power consumption can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical disc.

FIG. 3 is a graph showing a change in the amount of data stored in a temporary storage unit.

FIG. 4 is a diagram showing a flowchart of the operation of the device of the present invention.

FIG. 5 is a diagram showing a flowchart of the operation of the device of the present invention.

FIG. 6 is a block diagram showing a second embodiment.

FIG. 7 is a diagram illustrating a change in power consumption until returning to a normal mode or a length of time in a power save mode in modes 4 to 6.

FIG. 8 is a block diagram showing a third embodiment.

FIG. 9 is a block diagram showing a fourth embodiment.

FIG. 10 is a block diagram showing a fifth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 3 ... Laser generation means, 4 ... Pickup means, 6 ... Reproduction / servo signal generation means, 7 ... Servo block, 8 ... Focus control means, 9 ... Tracking control means, 10 ... Driver means, 14 ... Signal processing Means 1
5: Error correction means, 16: Temporary storage means, 17: Decompression means, 23: Data amount management means, 24: Timer, 25
... reproduction sector storage unit, 27 ... control means, 35 ... speed detection means, 36 ... signal type determination means, 37 ... disk type determination means, 38 ... linear velocity determination means.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 572 G11B 20/18 572C 572F

Claims (8)

[Claims] 1. An error correction unit for correcting an error in a reproduction signal reproduced from an optical disk, a temporary storage unit for temporarily storing the error-corrected reproduction signal, and a data amount stored in the temporary storage unit. An optical disc reproducing apparatus comprising: a data remaining amount managing unit, for expanding and outputting a temporarily stored reproduced signal after error correction, wherein the data remaining amount managing unit determines that the data amount reaches a first level. An optical disc reproducing apparatus, comprising: a control unit for performing control for suppressing power supply to at least the error correction unit when detecting a period from the time till the second level is reached. 2. A driver for driving and controlling a pickup for reproducing an optical disk, a reproduction / servo for obtaining a reproduction signal and a servo error signal from a signal obtained by the pickup, and a tracking for performing tracking control of the pickup. Control means, error correction means for correcting the error of the reproduction signal, temporary storage means for temporarily storing the error-corrected reproduction signal, and data remaining amount management for managing the amount of data stored in the temporary storage means Means for expanding and outputting a temporarily stored error-corrected playback signal, wherein the data remaining amount management means includes a second level after the data amount reaches a first level. When a time is detected until the error reaches the value, at least the power supply to the error correction means and the tracking control means is performed. An optical disc reproducing apparatus comprising control means for performing control for suppressing supply. A first control unit for controlling the rotation of the optical disk based on a speed signal obtained from a driving unit for driving the optical disk; and an optical disk based on a speed signal obtained from a reproduction signal for reproducing the optical disk. Second control means for controlling rotation of the optical disc, driver means for driving and controlling pickup means for reproducing the optical disc, reproduction / servo means for obtaining a reproduction signal and a servo error signal from a signal obtained by the pickup means, Focus control means for performing focus control on the pickup means, tracking control means for performing tracking control on the pickup means, error correction means for performing error correction on the reproduction signal, and temporary storage means for temporarily storing the error-corrected reproduction signal. Data for managing the amount of data stored in the temporary storage means. An optical disk reproducing apparatus for expanding and outputting a temporarily stored error-corrected reproduction signal, the data remaining amount management means including: When a period from the time till the second level is reached is detected, the rotation control of the optical disk by the second control means is switched to the rotation control of the optical disk by the first control means, and at least the error correction means, An optical disc reproducing apparatus comprising: a tracking control means; and a control means for controlling power supply to the focus control means. 4. A driver for driving and controlling a pickup for reproducing an optical disk, a reproduction / servo for obtaining a reproduction signal and a servo error signal from a signal obtained by the pickup, and an output of the reproduction / servo. A servo block that sends a servo signal to the driver based on the error, an error correction unit that corrects an error in the reproduction signal, a temporary storage unit that temporarily stores the error-corrected reproduction signal, and a storage unit that is stored in the temporary storage unit. An optical disk reproducing apparatus comprising: a data remaining amount managing unit that manages an amount of data stored therein; and a decompressed and output error-corrected reproduction signal that is temporarily stored and output. When a period from when the level reaches the second level to when the level reaches the second level is detected, the power supply to the above-described units and blocks is suppressed. An optical disk reproducing apparatus comprising a control means for controlling the optical disk. 5. A speed detection means for detecting a reproduction speed of the reproduction signal, wherein the control means performs control for suppressing power supply based on a detection result of the speed detection means and switches to a normal mode. 5. The optical disk reproducing apparatus according to claim 1, wherein a timing for returning is determined. 6. A signal type detecting means for determining a type of the reproduction signal, wherein the control means performs control for suppressing power supply based on a result of the determination by the signal type detecting means and performs a normal mode. 5. The optical disk reproducing apparatus according to claim 1, wherein a timing for returning to the optical disk is determined. 7. A disc type discriminating means for discriminating the type of the optical disc, wherein the control means performs control for suppressing power supply based on a discrimination result of the disc type discriminating means and returns to a normal mode. 5. The optical disk reproducing apparatus according to claim 4, wherein the timing is determined. 8. A signal type determining means for determining a type of the reproduction signal, and a linear velocity determining means for determining a linear velocity of the optical disk based on a result of the determination by the signal type determining means. The control means performs control for suppressing power supply based on the determination result of the signal type determination means and the determination result of the linear velocity determination means, and determines a timing for returning to the normal mode. An optical disk reproducing apparatus according to claim 4, wherein