JP4218039B2 - Disc playback apparatus and disc playback method - Google Patents

Description

  The present invention includes MD (Mini Disc), MD2, Video CD (Compact Disc), high-definition video CD, CD-R, CD-RW, DVD (Digital Versatile Disc), DVD video, DVD audio, DVD-ROM, DVD -R, DVD-RAM, DVD-R / W, DVD + RW, MO, and other optical disk playback devices and optical disk playback methods, and in particular, data for compression / decompression or shock proofing The present invention relates to a technique capable of reducing power consumption in an apparatus having temporary storage means for temporarily storing.

In general, a portable playback device for an optical disc such as a CD, a DVD, or an MD, for example, an MD portable playback device, has a shock proof memory having a capacity of about 4 MB for storing information corresponding to a playback time of about 10 seconds. By using the temporary storage of data in this memory, for example, while a music signal is being played from the memory, the pickup is kicked between tracks to the next sector to be played back. Waiting for rotation. In addition, for example, a DVD playback apparatus similarly has a temporary storage memory with a capacity of about 4 MB or about 16 MB, and sequentially stores playback information in this memory at a high transfer rate with a variable transfer rate. Reading, kicking the pickup between tracks, and giving a rotation signal to the 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.
nothing special

On the other hand, in a portable device that can be carried in the above-described optical disk playback device, it is desired to reduce the power consumption of the entire device as much as possible in order to maximize the battery usage time. Proposed. For example, in Japanese Patent Laid-Open No. 5-342585, there is a proposal to save power when the amount of data in a temporary storage memory reaches a maximum (predetermined value) during information reproduction from a disc in a mini-disc player. Yes. In this case, the memory capacity is 4 MB and power is saved only for 10 seconds, and the memory may be fixed time management, and detailed time management is not necessary. For this reason, the circuit block for saving power may be provided at a predetermined location, and processing at the time of restart can be dealt with by one method. However, in reality, when the type of optical disc, the type of playback signal, etc. are different, the storage time of temporary storage memory data may be different, and the return time must be fixedly determined in anticipation of the maximum safety time. did not become. Therefore, the reduction effect of power consumption is not so great. The present invention has been made in view of the above-described problems, and has been devised to effectively solve the problems. An object of the present invention is to provide a disk reproducing apparatus and a disk reproducing method capable of further reducing power consumption. There is.

In order to solve the above-described problems, the present invention provides a disk reproducing apparatus and a disk reproducing method configured as (1) and (2).
(1) temporary storage means for temporarily storing a reproduction signal obtained by reproducing a disc ;
Data remaining amount management means for managing the amount of data stored in the temporary storage means,
A disc playback device that decompresses a temporarily stored playback signal and outputs it as an extended signal,
First and second power restraining means for restraining power supply to a plurality of constituent means of the disk reproducing device;
Means for determining whether to perform the first or second power suppression corresponding to a transfer rate of a signal recorded on the disc ;
First level detection means for detecting that the amount of data by the remaining data management means has reached a first level by storing a reproduction signal from the disk in the temporary storage means ;
Based on the result of the first level detection means, the power of the power suppression unit is suppressed by performing the first or second power suppression, and the determined first or second power suppression state and the determined Means for determining a second level less than the first level of the amount of data by the remaining data management means based on a transfer rate;
Second level detecting means for detecting that the second level has been reached;
Based on the result of the second level detection means, the power of the suppressed power suppression unit is supplied again to return to the normal state during continuous reproduction from the temporary storage means. disc reproducing apparatus being characterized in that a return means.
(2) temporarily storing a reproduction signal obtained by reproducing the disc ;
Managing the amount of temporarily stored data;
Expanding the temporarily stored playback signal and outputting it as an expanded signal;
A step corresponding to the transfer rate of the recorded signal on the disc, to determine whether to suppress the first and second power supply to the plurality of building blocks of the disk reproducing apparatus,
A first level detecting step of managing a data amount and detecting that the data amount has reached a first level by temporarily storing a reproduction signal from the disc ;
Based on the results of the first level detecting step, and performing the first or second power restriction,
Determining based on the determined first or second power suppression state and the transfer rate, the first level a second level less than the data amount,
A second level detecting step for detecting that the second level has been reached;
Based on the result of the second level detection step, by supplying the power of the suppressed power suppression unit again, a return step for returning to the normal state during the temporary storage and continuous reproduction; A disc playback method comprising:

  According to the present invention, the following excellent effects can be exhibited. Cuts power supply to unnecessary parts (circuits) during playback of playback signals from temporary storage means used for shock proofing and data compression / decompression, and 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, the range that does not adversely affect the reproduction operation, Power consumption can be greatly reduced.

Hereinafter, an embodiment of a disk reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a reference example 1 of a reproducing apparatus, FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical disc, and FIG. 4 and 5 are flowcharts showing the operation of the playback apparatus.

  First, as shown in FIG. 2, the recording surface of the optical disc 1 is concentrically divided into a plurality of areas, in the illustrated example, an inner peripheral area A and an outer peripheral area B. A track (not shown) is formed concentrically or spirally on the entire recording surface. Here, since the optical disc 1 is rotationally controlled with a constant linear velocity (CLV), one round is divided into, for example, four sectors in the inner area A, and one round is performed in the outer area B, for example. It is divided into 8 sectors. The rotation period is about 40 msec when the pickup means described later is located in the area A on the inner circumference side and about 80 msec when located in the area B on the outer circumference side.

  Next, the playback apparatus will be described with reference to FIG. In the figure, reference numeral 2 is a spindle motor for rotating the optical disk 1, reference numeral 3 is a laser generating means for generating laser light for reading information, and reference numeral 4 is a pickup means for detecting the reflected light of the laser light irradiated on the optical disk 1. The laser generating means 3 and the pickup means 4 are integrally moved in the radial direction of the optical disc 1 by the drive mechanism 5. Reference numeral 6 represents a reproduction signal and a servo signal from the signal read out by the pickup means 4, and a speed signal for CLV control, and a reproduction / servo signal generation means having 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 and a tracking control unit 9. Reference numeral 10 denotes driver means for operating the pickup means 4 and the spindle motor 2, and includes a focusing circuit 11, a tracking circuit 12, and the like.

  Reference numeral 13 denotes an A / D converter that converts the reproduction signal from the reproduction / servo signal generation means 6 from analog to digital, and reference numeral 14 denotes a signal processing means. For example, the reproduction signal is converted into EFM (Eight to Fourteen Modulation). ) Decode from + signal to NRZ data. Reference numeral 15 denotes error correction means for performing error correction processing on the decoded reproduction signal. Here, the error-corrected data signal is a signal compressed at a variable transfer rate. Reference numeral 16 denotes a temporary storage means having a storage capacity of 4 MB made of, for example, a DRAM, which stores the compressed data and absorbs the time axis of the variable transfer rate. Reference numeral 17 denotes decompression means composed of, for example, an A (audio) -V (video) decoder, and decompresses the compressed data. Reference numeral 18 denotes a separation unit, which separates both the audio signal and the video signal when the decompressed data includes the audio signal and the video signal. Reference numerals 19 and 20 denote D / A converters that output respective signals as audio signals and video signals. 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, which is a predetermined amount from when writing to the temporary storage means 16 is prohibited. Time is measured here, for example, 400 msec. 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 made of, for example, a microcomputer and 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 a reproduction signal, a servo signal, and a speed signal are generated. The generated servo signal is input to the servo block 7, and based on this, the focus control means 8 generates a focus error signal, and the tracking control means 9 generates a tracking signal. The focus error signal and the tracking signal are input to the driver means 10, and the focus circuit 11 performs focus control and the tracking circuit 12 performs tracking control to the pickup means 4 based on each signal. As a result, the servo control of the pickup means 4 in one round is performed.

  The speed signal is obtained by a PLL circuit included in the reproduction / servo signal generation means 6, and this speed signal is input to the spindle control means 30 of the servo block 7 and based on this, the spindle control means 30. Generates a spindle control signal and outputs it to the spindle circuit 31 of the driver means 10. Thereby, the spindle circuit 31 performs CLV control by controlling the rotation of the spindle motor 2. Further, a rotational position signal such as a hall element (not shown) of the spindle motor 2 is fed back to the spindle control circuit 30, and FG (Frequency Generator) control of constant rotation is also performed from the speed signal generated from this signal. The reproduction signal from the pickup means 4 is optimized in frequency characteristics by the equalizer of the reproduction / servo signal generation means 6 and can be subjected to PLL.

  This 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 EFM + signal on the disk is decoded into NRZ data. The decoded signal is input to the error correction means 15, where error correction processing is performed 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, some CD and DVD audio discs have recorded uncompressed signals. Including these, audio and video signals have a transfer rate higher than that of signals read from the disc. In the case of low, the buffer processing by the temporary storage means 16 is similarly performed. The signal read from the temporary storage means 16 is expanded by the expansion means 17 composed of an AV decoder, and further separated into an audio signal and a video signal by the separation unit 18. Each signal is converted into an analog signal by the D / A converters 19 and 20 and output as an audio signal and a video signal, respectively.

  Here, the operation in the temporary storage means 16 will be described in detail. As described above, this storage means 16 has a storage capacity of, for example, 4 MB. This corresponds to a time information amount of about 500 msec when the optical disc is a DVD and the transfer rate is 8 Mbps. Is 80 msec, which corresponds to a time margin of about six tracks. In FIG. 3, each predetermined value of the full level that is the second level of the data storage amount and the empty level that is the first level is set in consideration of a certain margin, and the full level is 100%. Empty does not mean 0%. At this time, the data amount of the temporary storage means 16 is monitored by the remaining data management means 23.

As shown in FIG. 3, the temporary storage means 16 monitors and signals the tracking and focus errors as described above when the pickup means 4 starts reproducing information from a sector at a predetermined position on the optical disk 1. After processing error processing, sequential writing is started (area a). Then, when the storage amount exceeds the empty level, reading from the temporary storage unit 16 and expansion operation by the expansion unit 17 are started (area b). Thereafter, this read and decompression operation is continuously performed until there is no more data in the file. Of course, the reading speed from the optical disk 1 is 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, the writing of data to the temporary storage means 16 is prohibited (c region). Then, until the data storage amount becomes empty (this is normally done by time calculation), the track kicks and waits for the pickup means 4 to come to the sector to be reproduced next. At this time, the sector number to be reproduced next is stored in the reproduction sector storage unit 25. In this way, thereafter, writing of information from the optical disk 1 to the temporary storage means 16 and writing prohibition are repeated.

  The above operation is the operation of a conventional general playback device. Here, in the present invention, the supply power to the part unnecessary for operation is cut only for about 400 msec with a margin in the c region of about 500 msec waiting for rotation. . This 400 msec time is measured by the timer 24 in FIG. That is, when the data storage amount of the temporary storage means 16 is detected as full, the timer 24 is operated to measure, for example, 400 msec, and the power supplied to unnecessary parts is cut only during the 400 msec c1 region. Enter the power save mode. When 400 msec elapses, the power saving mode returns to the normal mode (c2 region).

  As a mode of this power saving mode, for example, the following three modes can be taken.

<Aspect 1>
First, as aspect 1, since it is necessary to prevent this processing from being disturbed since the stored data is read from the temporary storage means 16 without affecting the servo control, the signal The power supplied to the processing means 14 is cut, and all of these, that is, the synchronization detection process, the EFM + conversion process, and the power supplied to the error correction means 15 are cut, and all of this, that is, the error correction process is interrupted. Also, the writing control to the temporary storage means 16 is interrupted. Thereby, the power consumption as the whole apparatus is suppressed. The servo system returns to the normal kick waiting state by returning the power supply after 400 msec has elapsed while waiting for the kick.

<Aspect 2>
As aspect 2, in addition to the operation of aspect 1, only the tracking control is turned off with the focus control applied. Here, it is a matter of course that the sector to be reproduced next is stored in the reproduction sector storage unit 25. Since 100% of the signal cannot be obtained in the tracking control OFF state, the signal component of the RF signal is intermittently extracted in the CLV control mode of the spindle motor, and the CLV rough servo that generates the speed signal is used. Transition. For 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, a part of the tracking control means 9 and a driver means 10, for example, a tracking circuit 12 Cut the power supply. Thereby, it becomes possible to suppress power consumption more than the case of the said aspect 1. FIG. Since the servo control is turned off, the power supply is restored after 400 msec, the tracking control is turned on, the sector address detected and stored in the normal sector to be kicked is stored. And then return to the kick waiting state.

<Aspect 3>
As mode 3, in addition to the operation of mode 1, focus control and tracking control are turned off. Here, it is a matter of course that the sector to be reproduced next is stored in the reproduction sector storage unit 25. In the OFF state of the focus control and tracking control, since no reproduction signal is obtained and control cannot be performed in the CLV control mode of the spindle motor 2, the control shifts to the FG mode. 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. For 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) All of the servo block 7 (ie, the focus control means 8 and the tracking control means 9), and part of the driver means 10 (ie, the focus circuit 11 and the tracking circuit 12). ) Cut the power supplied to. Thereby, it becomes possible to suppress power consumption more than the case of the said aspect 2. FIG. As the servo system, the focus control and the tracking control are cut off, so here the timer 24 is set to 300 msec, which is shorter than the previous modes 1 and 2, with a lot of margin, and after this period elapses, the power is supplied. Return. Then, the focus control is turned on, and then the tracking control is turned on. Then, the sector address there is detected and moved to the previously stored sector to be kicked, whereupon the kick waiting state is restored. .

  In addition, in each of the above-described aspects 1, 2, and 3, as a common content, when any input signal is received from the input unit 26 during this power saving, for example, in the case of a portable video movie, during playback If a key input such as search or cue occurs, or if an error occurs in the sound or image being played back, and the necessary information is played back from the optical disc again, this may occur. By judging this input, the system immediately returns to the normal mode from the power saving state and shifts to processing corresponding to the input.

  Next, the above operation will be described generally with reference to the flowcharts shown in FIGS. First, when the reproduction of the reproduction apparatus is started, reading of information is started when the pickup means 4 goes to a predetermined sector where reproduction is started (S1), and error correction of the read information data is started by the error correction means 15. (S2). Then, storage of the error-corrected data in the temporary storage means 16 is also started (S3). Here, the remaining data management means 23 monitors the data storage amount of the temporary storage means 16 (S4), and when this data storage amount exceeds the empty level, the control means 27 receives the data from the temporary storage means 16. The reading of data is started and the operation of the expansion means 17 is also started, and the compressed data is expanded by the expansion means 17 (S5).

  When the amount of data stored in the temporary storage means 16 becomes full (S6), at the same time, data writing to the temporary storage means 16 is prohibited (S7), and the reproduction sector storage section 25 of the next read sector is returned. Storage (S8), transition to the power saving mode of any one of the three modes as described above (S9), and start of the timer 24 (S10). When the time set by the timer 24, for example, 400 msec has elapsed (S11), the power saving mode returns 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). If 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 while there is data to be read. Perform (S17). If there is no more data to be read, the reproduction process is terminated.

  Further, whether or not there is an emergency input is always determined while the timer time has not elapsed in S11, that is, during the power saving mode (S18), and if there is an emergency input, the corresponding emergency process is performed. (S19) As a result, the reproduction process is continued or ended. In the reference example 1 described above, application to each of the modes 1 to 3 of the power saving mode was not described in detail, but here, new modes 4 to 6 similar to the previous modes 1 to 3 and the application conditions thereof This will be described in detail with reference to Reference Examples 2 to 4.

First, in Reference Example 2, 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 the second reference example. Here, speed detection means 35 is provided between the reproduction / servo signal generation means 6 and the control means 27, and the reproduction speed (transfer rate) of the reproduction signal is detected and the detection result is input to the control means 27. ing. The other components are the same as those of the reference example 1 shown in FIG. For example, it is assumed that there are different types of discs having different transfer rates of reproduction signals in a recordable DVD or the like as follows depending on the type of the recorded disc.
1. A 2-hour mode in which the image quality is good but the overall playback time is about 2 hours.
2. A 4-hour mode in which the image quality is normal, but the overall playback time is about 4 hours.
3. A 6-hour mode where the overall playback time is about 6 hours, although the image quality is poor.
When the control signal of the disk is read out by such a variable amount of the transfer rate of the reproduction signal and the speed detection means 35 determines, the power saving mode is selected from among the three modes 4 to 6 accordingly. Select one.

<Aspect 4>
As mode 4, only the tracking control is turned off with the focus control applied. Here, of course, the sector to be recorded next is stored in the sector storage unit 25. Since 100% of the signal cannot be obtained in the tracking control OFF state, the signal component of the RF signal is intermittently extracted in the CLV control mode of the spindle motor, and the CLV rough servo that generates the speed signal is used. Transition. As the power saving, under the control of the control means 27, a part of the recording / reproducing / servo means 6, such as a part of the tracking error signal generation circuit and the servo block 7, such as a part of the tracking control means 9 and the driver means 10, such as tracking The power supplied to the circuit 12 is cut. Since the servo control is turned off, when the return timing obtained by the control means is reached as described later after the pause release signal is input, that is, when approximately 400 msec has elapsed since entering the power saving mode. Then, the power supply is restored, the tracking control is turned on, the sector address there is detected and the stored sector is moved to the normal sector to be kicked, and then the kick standby state is restored.

<Aspect 5>
As a mode 5, the focus control, the tracking control, and the laser generating means 3 are turned off.
Here, of course, the sector to be recorded next is stored in the sector storage unit 25. In the OFF state of the focus control and tracking control, since no reproduction signal is obtained and control cannot be performed in the CLV control mode of the spindle motor 2, the control shifts to the FG mode. 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 recording / reproducing / servo means 6 such as a focus signal generating circuit, a tracking error signal generating circuit, a reproducing signal generating circuit, an equalizer circuit, a PLL circuit, a speed signal generating circuit and a servo block are controlled by the control means 27. 7, for example, the focus control means 8, the tracking control means 9, the traverse control means 40, and a part of the driver means 10, such as the focus circuit 11, the tracking circuit 12, and the laser generation means 3 are cut off.
Thereby, it becomes possible to suppress power consumption more than the case of the said aspect 4. FIG.

  As the servo system, the focus control and the tracking control are cut off. Therefore, when the return timing obtained by the control means is reached as described later, that is, when approximately 500 msec has elapsed since entering the power saving mode, power supply is performed. To return. Then, after turning on the laser generating means 3, the focus control is turned on, then the tracking control is turned on, and the sector address is detected and moved to the previously stored sector to be kicked. Then, return to the kick waiting state. In particular, 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 buffer storage time exceeds 500 msec. However, in order to further reduce the power consumption, it is a matter of course that the rotational speed of the spindle motor in the FG mode is reduced to about 1/2 or 1/4 of the original.

<Aspect 6>
As mode 6, the focus control, tracking control, laser generating means 3 and spindle control are turned off. Here, of course, the sector to be recorded next is stored in the sector storage unit 25. In this state, the focus control, tracking control, laser generating means 3 and spindle control are all stopped, so that power consumption can be greatly reduced. However, for example, it takes about 1 second to recover, and requires a certain amount of power when starting the spindle motor. For example, if this mode is not used with a power saving time of about 6 seconds or more, Power consumption will increase. As the power saving, all of the recording / reproducing / servo means 6 such as a focus signal generating circuit, a tracking error signal generating circuit, a reproducing signal generating circuit, an equalizer circuit, a PLL circuit, a speed signal generating circuit and a servo block are controlled by the control means 27. 7, for example, 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. Thereby, it becomes possible to suppress power consumption more than the case of the said aspect 5. FIG.

  As the servo system, focus control and tracking control, laser generation means 3 and spindle control are turned off, so that it will be omitted when the return timing obtained by the control means is reached, that is, after the power saving mode is entered. When 1000 msec elapses, the power supply is restored. Thus, 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 in advance. Move to the sector where you want to kick and return to the kick-waiting state. Here, with reference to FIG. 7, the length of time of the power saving mode and the change in power consumption until returning to the normal mode in each of the above aspects 4 to 6 will be described in detail.

  7A shows the change in power consumption in the case of aspect 4, FIG. 7B shows the change in power consumption in the case of aspect 5, and FIG. 7C shows the change in power consumption in the case of aspect 6. It shows a change. In the case of the aspect 4 shown in FIG. 7A, as described above, only the tracking control is turned off while the focus control is applied. In this case, for example, since the entire recording time is the 2-hour mode, the image quality is good, but the transfer rate is high, and the time from full to empty is about 500 msec (corresponding to the area C1 + C2 in FIG. 3) Since the control is short and there are few controls that are turned off, the time C2 required for the recovery is short and is about 100 msec. The power consumption in the power saving mode is about 80% with respect to the standby time. When returning from the power saving mode to the normal mode, when tracking control is turned on, a large amount of power consumption (110%) is required temporarily until a predetermined track is sought, and returns to 100% during standby. When reading from the optical disc, 120% power consumption is required.

  In the case of the 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 to reach from full to empty is about 1 sec (corresponding to the area C1 + C2 in FIG. 3). Since the control is slightly longer than 4 and the control that is turned off is also slightly increased, the time C2 required for return is slightly longer and is about 500 msec. The power consumption in the power saving mode is about 50% of that during standby, which is more efficient than in the case of the fourth aspect. When returning from the power saving mode to the normal mode, the laser 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 the mode 6 shown in FIG. 7C, the focus control, the tracking control, the laser generating means 3 and the spindle control are turned off as described above. In this case, the image quality is bad transfer rate because for example the overall record time is 6 hours mode is small, a degree time to reach the full up empty is a time of 2 sec (corresponding to the region C1 + C2 in FIG. 3), aspect Since the time is longer than 5 and the number of controls that are turned off is further increased, the time required for recovery is further increased to about 1 sec. The power consumption in the power saving mode is about 20% of the standby time, which is more efficient than in the case of the fifth aspect. When returning from the power saving mode to the normal mode, the power is gradually returned in the order of spindle-on, laser-on, focus control-on, and tracking control-on, and the power consumption gradually increases accordingly. The power reduction amount of each aspect 4 to 6 is about 84%, about 75%, and about 60%, respectively, when the power saving mode is not used, and the power consumption is greatly reduced within a range that does not adversely affect the reproduction operation. It becomes possible to reduce.

  A specific example will be described. For example, when the temporary storage unit 16 of 4 MB is set to the 2-hour mode, an image of 8 Mbps can be recorded and 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 becomes 1 sec at 4 Mbps, and in the case of the 8-hour mode, it becomes 2 sec at 2 Mbps. Here, if 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 set to 0 for empty and 4 MB for full. In this case, since 100 msec / 500 msec = 0.2, the value is 4 MB × 0.2 = 0.8 MB. That is, with respect to 4 MB, the time point when the stored data amount becomes 0.8 MB may be set as the return timing, and the return operation is started at this timing. Regarding other aspects 5 and 6, the control means 27 determines the return timing in the same procedure. The calculation shown here is a calculation when all of the storage capacity of 4 MB is used, but in actuality, a value with clogged both empty and full is used with a margin. Of course, the flow charts shown in FIGS. 4 and 5 are applied to the control flow in the second reference example. In the reference example 2, the mode of the power saving mode is selected according to the playback speed of the playback signal. Instead, the mode of the power saving mode is selected according to the type of the playback signal. Also good.

  FIG. 8 shows a block diagram of the third reference example. Here, a signal type determination unit 36 is provided between the reproduction / servo signal generation unit 6 and the control unit 27, and the type of the reproduction signal to be reproduced is determined and determined, and the determination result is input to the control unit 27. is doing. The other components are the same as those of the reference example 1 shown in FIG. Further, the function of the signal type determining means 36 may be assigned to the input unit 26, and the type of the input signal may be manually input from the input unit 26. As a reproduction signal, a description will be given by taking two types of reproduction signals as an example in a case where both a video signal and an audio signal are included in a DVD disc. For example, if the playback signal includes a video signal and an audio signal, assuming 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. .

  Also, when the reproduction signal includes only an audio signal, assuming that recording is performed with high sound quality because the data amount is smaller than that of the video signal, the transfer rate is set low, for example, 2 Mbps, and the recording time is set to 8 hours. When in the mode to perform, mode 6 is selected. As described above, the control unit 27 selects one of the above-described modes 4 and 6 as the power saving 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 is different for each mode, the return timing is calculated as a converted value of the remaining capacity of the temporary storage means 16. In the reference example 3, the mode of the power saving mode is selected according to the type of the reproduction signal. Instead, the mode of the power saving mode is selected according to the type of the optical disk to be reproduced. May be.

  FIG. 9 shows a block diagram of the fourth reference example. Here, a disc type discriminating unit 37 is provided between the pickup unit 4 and the control unit 27, discriminating the type of the optical disc 1 to be loaded, and inputting the discrimination result to the control unit 27. The other components are the same as those of the reference example 1 shown in FIG. The disc type discriminating means 37 discriminates the type when the optical disc 1 is loaded. Several methods or mechanisms have already been proposed. For example, the amount of reflected light differs depending on the type of the optical disc. It is possible to use a mechanism in which the amount of reflected laser light is detected and the type of the optical disk is determined based on the detected value.

  Here, a case where a DVD disc and a CD-RW disc that can be recorded in common with the DVD disc are used as the type of the optical disc, and a video signal and an audio signal are reproduced as reproduction signals will be described as an example. For example, if the disc type discriminating means 37 discriminates whether the disc type disc optical disc is a DVD type optical disc or a CD-RW type optical disc. For example, mode 4 is selected in the mode in which the rate is set high, for example, 8 Mbps, and the recording time is about 2 hours. As a result of the above determination, when the optical disc is a CD-RW, assuming that the reproduction is performed with the normal image quality of MPEG1, the mode is set to mode 6 in which the transfer rate is set low, for example, 2 Mbps, and the recording time is 1 hour. Select.

  As described above, the control unit 27 selects one of the above-described modes 4 and 6 as the power saving mode based on the determination result of the disk type determination unit 37. At this time, since the timing for returning to the normal mode differs for each mode, the timing for returning is calculated as a converted value of the remaining capacity of the temporary storage unit 16. Of course, the flowchart shown in FIG. 5 is applied to the control flow in the reference example 4.

  In the reference example 4 described above, the mode of the power saving mode is selected according to the type of the optical disc. Instead, the mode of the power saving mode is selected according to the type of the reproduction signal and the linear velocity. It may be. FIG. 10 shows a block diagram of such an embodiment. Here, the linear velocity determining means 38 is provided between the signal type determining means 36 and the control means 27, and the linear velocity of the optical disk to be set, that is, the rotation speed of the spindle motor is obtained from the transfer rate, and the determination result is obtained. Is input to the control means 27. The other components are the same as those of the reference example 3 shown in FIG.

  Here, as an example of a playback signal to be played back, a case where a signal having a high audio signal transfer rate and a signal having a low transfer rate is played on a DVD disc in a portable device will be described as an example. For example, when the recording signal is a 6-channel signal of linear PCM and the transfer rate is set as high as 8 Mbps and the recording time is about 2 hours, the mode 4 is selected. The mode 5 is selected when the playback signal is a 2-channel MPEG1 signal and the transfer rate is 2 Mbps, for example, and the recording time is about 8 hours.

  As described above, the control unit 27 selects any one of the above-described modes 4 and 5 as the power saving mode based on the signal type determination result from the signal type determination unit 36 and the determination result of the linear velocity determination unit 38. For example, when the transfer rate is slow, 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 MPEG1 is reproduced, the rotational speed of the disk is reduced to ½ that when linear PCM is reproduced. In addition, since the return timing to the normal mode is different for each mode, the return timing is calculated as a converted value of the remaining capacity of the temporary storage unit 16. Here, the reason for changing the low power mode even though the storage time of the temporary storage means 16 does not change is that the reading speed from the disk is substantially doubled because the rotational speed of the disk has dropped to half. This is because when compared with the normal rotational speed, the time during which power consumption can be reduced is shortened. Further, as a matter of course, the flowcharts shown in FIGS. 4 and 5 are applied to the control flow in this embodiment.

FIG. 6 is a block configuration diagram illustrating Reference Example 1 of the recording apparatus. It is explanatory drawing for demonstrating the concept of the sector in an optical disk. It is a graph which shows the change of the memory | storage data amount in a temporary memory means. It is a figure which shows the flowchart of operation | movement of the apparatus of the reference example 1. FIG. It is a figure which shows the flowchart of operation | movement of the apparatus of the reference example 1. FIG. It is a block block diagram which shows the example 2 of a reference. It is a figure which shows the change of the power consumption until it returns to the length of time of the power saving mode in mode 4-6, and a normal mode. It is a block block diagram which shows the reference example 3. FIG. It is a block block diagram which shows the reference example 4. FIG. It is a block block diagram which shows an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 3 ... Laser generation means, 4 ... Pick-up means, 6 ... Reproduction | regeneration servo signal generation means, 7 ... Servo block, 8 ... Focus control means, 9 ... Tracking control means, 10 ... Driver means, 14 ... Signal processing Means 15 ... Error correction means 16 ... Temporary storage means 17 ... Decompression means 23 ... Data amount management means 24 ... Timer 25 ... Playback sector storage section 27 ... Control means 35 ... Speed detection means 36 ... Signal type determining means, 37... Disc type determining means, 38... Linear velocity determining means.

Claims (2)

Temporary storage means for temporarily storing a reproduction signal obtained by reproducing a disc ;
Data remaining amount management means for managing the amount of data stored in the temporary storage means,
A disc playback device that decompresses a temporarily stored playback signal and outputs it as an extended signal,
First and second power restraining means for restraining power supply to a plurality of constituent means of the disk reproducing device;
Means for determining whether to perform the first or second power suppression corresponding to a transfer rate of a signal recorded on the disc ;
First level detection means for detecting that the amount of data by the remaining data management means has reached a first level by storing a reproduction signal from the disk in the temporary storage means ;
Based on the result of the first level detection means, the power of the power suppression unit is suppressed by performing the first or second power suppression, and the determined first or second power suppression state and the determined Means for determining a second level less than the first level of the amount of data by the remaining data management means based on a transfer rate;
Second level detecting means for detecting that the second level has been reached;
Based on the result of the second level detection means, the power of the suppressed power suppression unit is supplied again to return to the normal state during continuous reproduction from the temporary storage means. disc reproducing apparatus being characterized in that a return means. Temporarily storing a playback signal obtained by playing a disc ;
Managing the amount of temporarily stored data;
Expanding the temporarily stored playback signal and outputting it as an expanded signal;
A step corresponding to the transfer rate of the recorded signal on the disc, to determine whether to suppress the first and second power supply to the plurality of building blocks of the disk reproducing apparatus,
A first level detecting step of managing a data amount and detecting that the data amount has reached a first level by temporarily storing a reproduction signal from the disc ;
Based on the results of the first level detecting step, and performing the first or second power restriction,
Determining based on the determined first or second power suppression state and the transfer rate, the first level a second level less than the data amount,
A second level detecting step for detecting that the second level has been reached;
Based on the result of the second level detection step, by supplying the power of the suppressed power suppression unit again, a return step for returning to the normal state during the temporary storage and continuous reproduction; A disc playback method comprising:

Images