JPH06318359A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce power consumption at the time of recording and reproducing by stopping useless power supply. CONSTITUTION:An optical pickup mounting recording and reproducing heads 4 and 5 is moved to a prescribed address on an information recording medium 2, which, is rotated by a rotating control part 3, by a feed control part 7, and focus, etc., are controlled by a control part 6, and then information is recorded with a laser beam, which is controlled by a power control part 8, via an information amount compressing part 13, a buffer 14 and the recording head 4, and is reproduced via the reproducing head 5, a buffer 15 and an information amount expanding part 16. A period without writing and reading information by the recording and reproducing heads 4 and 5 which operate intermittently during recording and reproducing is detected by a power supply control part 9, and power supply to, at prescribed time during the above period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus capable of compressing and expanding voice and image information as digital information and recording / reproducing the information, and particularly reducing power consumption.

[0002]

2. Description of the Related Art In recent years, an information recording / reproducing apparatus of this type, which employs an information amount compression technique, has been eagerly developed because it has advantages such as downsizing of the apparatus and long-term recording. The thing described in Kaihei 4-103079 is known. As shown in FIG. 3 for convenience, this information recording / reproducing apparatus includes a sound input from the outside on the input side of an information recording / reproducing unit 21 for writing / reading information to / from the information recording medium 2. Analog input unit 11 for performing analog signal processing such as level adjustment on image signals
An A / D converter 12 for converting the processed analog signal to a digital signal, an information amount compressor 13 for compressing the digital signal, and a buffer 14 for temporarily storing the compressed information. On the other hand, on the output side of the information recording / reproducing unit 21, a buffer 15 for temporarily storing the output information, an information amount expanding unit 16 for expanding the stored digital signal, and an analog for the expanded digital signal. A D / A converter 17 for converting into a signal, and a voice after converting the converted analog signal to a level adjustment process or the like,
An analog output section 18 for outputting an image signal to the outside is provided.

The information recording / reproducing section 21 includes a rotation control section 23 for rotating the information recording medium 2 at a predetermined rotation speed, a recording head 4 for writing information on the information recording medium 2, and a reproducing head 5 for reading information. An optical pickup control unit 26 for controlling focus and tracking of an optical pickup equipped with both heads 4 and 5, and an optical pickup feed control unit 27 for searching a predetermined address of the information recording medium 2 and moving the optical pickup to that position. , A laser power control unit 28 for controlling the output of laser light required for writing and reading information.

The compression of, for example, voice information in the input side information amount compression unit 13 is performed by utilizing human auditory characteristics so as not to deteriorate the sound quality, and by the compression, for example, the sampling frequency is 44.1 kHz, 16 bits, 2 About 1.41M on the channel
The voice information at the information transfer rate of b / s is about 256 Kb / s. Since the input information transfer speed in the information recording / reproducing unit 21 of the compressed audio information is faster than the information transfer speed after compression, it is temporarily stored in the buffer 14 for matching, and the timing as shown in FIG. Is recorded on the information recording medium 2. In other words, the information transfer rate before compression is 1.
Assuming that 41 Mb / s, that after compression is 256 Kb / s and one second of information is one data block, 1.41 M before compression in FIG.
The information of the 1-bit data block 1 is compressed by the information compression unit 13, and the 256-K-bit data block 1'in FIG. 4 is compressed.
Information. Since the input / output information transfer rate of the information recording / reproducing unit 21 is 1.41 Mb / s, 256 Kbit information is 256K
b / (1.41 Mb / s) = 0.18 seconds for recording. Therefore, although the information amount is always compressed due to the difference in the information transfer speed, the information is recorded on the information recording medium only intermittently as shown by the hatched portion of the recording data in FIG.

On the other hand, in the expansion of the audio information in the information expansion unit 16 on the output side, the output information transfer speed from the information recording / reproducing unit 21 is 1.41 Mb / s, and the information transfer speed before expansion is 256.
Since it is faster than Kb / s, it is temporarily stored in the buffer 15 for matching and is reproduced at the timing from the bottom to the top of FIG. That is, the recording data of FIG. 4 corresponds to the read data, the compressed data corresponds to the pre-expansion data, and the pre-compression data corresponds to the post-expansion data. Therefore, the reading of information from the information recording medium 2 is performed at high speed as indicated by the hatched portion.
Although it is only intermittently performed at (1.41 Mb / s), the information decompression is always performed on the information input from the buffer 15 at a low speed (256 Kb / s), and the information after decompression is high speed (1.41 Mb / s).
Mb / s) is output to the D / A converter.

[0006]

In the above-mentioned conventional information recording / reproducing apparatus, the input / output information transfer speed in the information recording / reproducing unit 21 is higher than the information transfer speed in the input side of the buffer 14 or the output side of the buffer 15. As described above, writing and reading of information with respect to the information recording medium 2 are intermittent, and 1 second of information is read and written in 0.18 seconds. However, during the remaining 0.82 seconds, the information recording / reproducing unit 21 is kept in a so-called still state in preparation for the next writing and reading, and the internal rotation control unit 23 and the optical pickup control unit 2 are held.
6, the optical pickup feed control unit 27, the laser power control unit 28, and the like are all powered and operating, and the optical pickup performs a tracking jump once per rotation to trace the same track. Therefore, there is a drawback that useless power is consumed although writing and reading are not performed on the information recording medium during recording or reproduction.

Therefore, an object of the present invention is to detect power consumption during recording or reproduction by detecting a period during which information is not written or read on an information recording medium and stopping control operations such as unnecessary power supply. An object is to provide an information recording / reproducing device capable of reducing the number.

[0008]

In order to achieve the above object, an information recording / reproducing apparatus of the present invention performs rotation control means for rotating an information recording medium, and writes / reads information to / from the information recording medium. Information writing means, information reading means, optical pickup control means for controlling the focus and tracking of an optical pickup equipped with the information writing and reading means, and a predetermined address of the information recording medium are searched to find the address. An optical pickup feed control means for moving the optical pickup to a position and a laser power control means are provided, and information stored in the temporary storage means which is processed by the information amount compression means is temporarily stored in the information writing means. The information recorded on the information recording medium via the information recording medium or the information recorded on the information recording medium is read out via the information reading means. In the case where the information is temporarily stored in the temporary storage means and then processed and reproduced by the information expanding means, the information writing means which operates intermittently during recording does not write information, or during reproduction. The information reading means, which operates intermittently, detects a period during which information is not read, and the rotation control means, the optical pickup control means, the optical pickup feed control means, and the laser power control are detected for a predetermined time within this period. It is characterized in that control means stopping means for stopping the control operation is provided for at least one of the means.

[0009]

The optical pickup equipped with the information writing / reading means is moved by the optical pickup feeding control means to a predetermined address of the information recording medium rotated by the rotation control means, and the optical pickup control means performs focus and tracking. Is controlled. Then, by the laser light controlled by the laser power control means, the information compressed by the information amount compression means, the information stored in the temporary storage means is recorded on the information recording medium via the information writing means, The information recorded on the information recording medium is read out by the information reading means, stored in the temporary storage means, expanded by the information expansion means and reproduced. Since there is a difference in the information transfer speed between the input and output sides of both the temporary storage means, both the information writing and reading means operate only intermittently. Therefore, the control operation stopping means detects a period during which the information writing means does not write information during recording, or a period during which the information reading means does not read information during reproduction, and within this period. The control operation is stopped for at least one of the rotation control means, the optical pickup control means, the optical pickup feed control means, and the laser power control means for a predetermined time. Therefore, wasteful power consumption can be reduced.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic view showing an embodiment of the information recording / reproducing apparatus of the present invention. This driving device is substantially the same as the conventional example described in FIG. 3 except that a power feeding control unit 9 for controlling power feeding to each block in the information recording / reproducing unit 1 is newly provided, and the same members are provided. Have the same number. That is, in FIG. 1, 11 is an analog input section, 12 is an A / D conversion section, 13 is an information amount compressor, and 14 is a buffer, and these are provided on the input side of the information recording / reproducing section 1, while the information recording / reproducing section is provided. A buffer 15 and an information amount expansion unit 1 are provided on the output side of the unit 1.
6, a D / A conversion unit 17 and an analog output unit 18 are sequentially provided. The information recording / reproducing unit 1 includes a rotation control unit 3 that rotates the information recording medium 2 at a predetermined rotation speed, and an information recording medium 2
A recording head 4 and a reproducing head 5 for writing and reading information to and from the optical head, an optical pickup controller 6 for controlling focus and tracking of an optical pickup equipped with both heads 4, 5, and a predetermined address of the information recording medium 2. And a laser power control unit 8 for controlling the output of a laser beam necessary for writing and reading information,
And a power supply control unit 9 as a control operation stopping unit described later.

The power supply controller 9 detects a period during which the recording head 4 operating intermittently during recording does not write information, and a period during which the reproducing head 5 does not read information during reproduction. Then, the rotation control unit 3, the optical pickup control unit 6, the optical pickup feed control unit 7, and the laser power control unit 8 only for a predetermined time within this period.
Power supply to all of them is stopped. That is, as shown in the bottom control state column of the timing chart of FIG. 2, the "record" portion is in the information writing period, and the "stop" and "startup" portions are in the periods other than the information writing period, respectively. Yes, but
The "stop" part corresponds to the above power supply suspension period. Also,
The "start-up" part is the above-mentioned control units 3, 6-
This is the period required to launch 8. Above "Record",
The time of each part of "Stop" and "Startup" is 1.8 seconds,
It is 5.2 seconds and 3.0 seconds, and the total time for one cycle is 10 seconds. This one cycle time corresponds to one data block which is intermittently collectively output from the buffer 14 and written to the information recording medium 2.
The reason for setting 10 seconds different from 1 second described in the conventional example is that the non-writing time is made sufficiently longer than the writing time by increasing the amount of data stored in the buffer 14.
On the other hand, the control of the power supply stop by the power supply control unit 9 during the reproducing operation is similar to the above, and “Record” in the control state column of FIG. 2 is selected.
You can think of it as "reproduction" instead of "startup".
The "stop" part corresponds to the power supply stop period.

The information recording / reproducing apparatus having the above structure operates as follows. The optical pickup equipped with the recording head 4 and the reproducing head 5 is moved by the optical pickup feed control unit 7 to a predetermined address of the information recording medium 2 which is rotated at a predetermined rotation speed by the rotation control unit 3 to control the optical pickup. The unit 6 controls focus and tracking. Then, by the laser light controlled by the laser power control unit 8, the information processed by the information amount compression unit 13 and temporarily stored in the buffer 14 is recorded on the information recording medium 2 via the recording head 4, In addition, the information recorded on the information recording medium 2 is read out via the reproducing head 5, temporarily stored in the buffer 15, and then processed and reproduced by the information expansion unit.

During the recording operation, the information transfer rate before compression in the information amount compression unit 13 is 1.41 Mb / s and the information transfer rate after compression is 256, as in the conventional example described in FIG.
Since it is Kb / s, which is slower than the input information transfer rate of 1.41 Mb / s in the information recording / reproducing unit 1, information for 10 seconds is temporarily stored in the buffer 14 for matching as one data block. It is recorded on the information recording medium 2 at the timing shown. That is, 14.1 before compression in FIG.
The information of the M-bit data block 1 is the information compression unit 13
And is compressed into the information of the 2.56 Mbit data block 1'in FIG. Since the input / output information transfer rate in the information recording / reproducing unit 1 is 1.41 Mb / s, 2.56 Mbit information is 2.
It can record at 56 Mb / (1.41 Mb / s) = 1.8 seconds. Therefore, due to the difference in the information transfer speed, the information amount is always compressed, but the recording of the information on the information recording medium 2 by the recording head 4 is intermittent as shown by the hatched portion of the recording data in FIG. Only done.

Thus, although information corresponding to 10 seconds which is one cycle is recorded in 1.8 seconds at the beginning of the cycle, the power feeding control section 9 writes the information to the information recording medium 2 by the recording head 4. When the end is detected, the power supply to all of the rotation control unit 3, the optical pickup control unit 6, the optical pickup feed control unit 7, and the laser power control unit 8 is stopped during the following non-information writing period of 5.2 seconds. By stopping this power supply, specifically, an error generation circuit that generates an error signal based on a signal from the optical pickup, a phase compensation circuit that performs phase compensation of the control system, a driver circuit that drives an actuator or a motor, and a reproduction signal are generated. The operations of the RF signal processing circuit for processing, the address demodulation circuit for reading an address, the reproduction signal demodulation circuit for generating a rotation control signal, the laser drive circuit, and the like are stopped. When the power supply is stopped for 5.2 seconds,
The power supply is restarted and the startup operation is performed for 3.0 seconds. Thus, the initial writing of the next one cycle is repeated.

On the other hand, during the reproduction operation, the same power supply is stopped. That is, like the conventional example described in FIG.
The output information transfer rate in the information recording / reproducing unit 1 is 1.41 Mb / s
Since this is faster than the information transfer rate of 256 Kb / s before decompression in the information amount decompression unit 16, information for 10 seconds is matched as one data block, so the buffer 15
Is temporarily stored in and is reproduced at a timing similar to that shown in FIG. That is, if "record" in the column of control status in FIG. 2 is read as "play", read data in the column of recorded data is read data, compressed data is pre-expansion data, and pre-compression data is post-expansion data. Since the output information transfer rate of the information recording / reproducing unit 1 is 1.41 Mb / s, 2.56 Mbit information is intermittently read in 1.8 seconds as shown by the hatched portion in the figure,
The data is temporarily stored in the buffer 15, and the data decompression unit 16 is used as the data block 1 ′ at an information transfer rate of 2.56 Mb / s in 1 second.
Is input to the D / A conversion unit 17 at the information transfer rate of 1.41 Mb / s.

Thus, while the decompression processing is always performed in the information decompression unit 16, the reading by the reproducing head 5 is read in 1.8 seconds at the beginning of each cycle, but the power feeding control unit 9 causes the reproducing unit 5 to perform the reproduction. Information recording medium 2 with head 5
The end of the information reading from the device is detected, and power is supplied to all of the rotation control unit 3, the optical pickup control unit 6, the optical pickup feed control unit 7, and the laser power control unit 8 during the subsequent non-information reading period of 5.2 seconds. To stop. Then, when the power supply is stopped for 5.2 seconds, the power supply is restarted, the start-up operation is performed for 3.0 seconds, and the initial reading of the next one cycle is repeated.

In this way, the power feeding control section 9 records
During 5.2 seconds of each 10-second cycle of reproduction, power supply to the main control units 3, 6, 7, and 8 of the information recording / reproducing unit 1 is stopped, so that the entire cycle of 1-second cycle is complete. Compared with the conventional example in which power is continuously supplied to the main control unit over the entire period, the information recording / reproducing unit 1 during the recording / reproducing operation is performed.
It is possible to reduce the power consumption by about half, to eliminate wasteful power consumption, and to improve the economical efficiency of the information recording / reproducing apparatus.

In the above embodiment, the power feeding control unit 9
Power supply to all of the rotation control unit 3, the optical pickup control unit 6, the optical pickup feed control unit 7, and the laser power control unit 8 of the information recording / reproducing unit 1 was stopped, but only for some of them. Power supply can be stopped. In this way, the effect of reducing the power consumption is reduced, but since the operation startup time can be shortened, there is an advantage that the capacities of the buffers 14 and 15 can be reduced. Further, in the above embodiment, the information amount compression unit 11-14 and the information amount expansion unit 15-18 are provided on the input and output sides of the information recording / reproducing unit 1, respectively, but only one of them may be provided. It is also possible to use only the information recording / reproducing unit 1, and for example, information is read from the information recording medium 2 at twice the normal rotation speed using the information decompression unit 16 and the like and temporarily stored in the buffer 15. , Information can be reproduced at a regular information transfer rate. In this way, the amount of information that requires 10 seconds to read can be read in 5 seconds, and the control operation can be stopped for the remaining 5 seconds to reduce power consumption.

In the above embodiment, the control operation stopping means stops the power supply to the circuit system included in each control means, and the voltage applied to the actuator, motor, laser, etc. included in each control means is set to zero. Although it is configured by the power feeding control unit 6, this control operation stopping means is, for example,
Can be composed of The circuit system included in each control means is supplied with power and the clock signal is supplied to the digital circuit.However, the voltage applied to the actuator, motor, laser, etc. included in each control means is controlled by the control loop. It is made to zero by cutting. Power is supplied to the circuit system included in each of the control means,
And stop the supply of the clock signal to the digital circuit,
Alternatively, the frequency of the clock signal is lowered and the voltage applied to each of the above actuators, motors, lasers, etc. is made zero by cutting the control loop. Also, with these configurations as well, useless power consumption can be reduced, so that the economical efficiency of the information recording / reproducing apparatus is improved.

[0020]

As is apparent from the above description, the information recording / reproducing apparatus of the present invention includes the rotation control means for rotating the information recording medium and the information writing for writing / reading information to / from the information recording medium. Means, information reading means, optical pickup control means for controlling focus and tracking of an optical pickup equipped with the information writing and reading means, and a predetermined address of the information recording medium is searched, and the optical pickup is located at the address. The information recording means is provided with the optical pickup feed control means for moving the optical pickup, the laser power control means, the information processed by the information amount compression means, and temporarily stored in the temporary storage means through the information writing means. The information recorded on the medium or the information recorded on the information recording medium is read through the information reading means,
After being temporarily stored in the temporary storage means, processed by the information decompression means and reproduced, the control operation stopping means
The information writing means, which operates intermittently during recording, detects a period in which information is not written, or the information reading means, which operates intermittently during reproduction, detects a period in which information is not read, Since the control operation for at least one of the rotation control means, the optical pickup control means, the optical pickup feed control means, and the laser power control means is stopped only for a predetermined time within this period, useless power supply is performed. By reducing the power consumption, the power consumption during recording and reproduction can be reduced, and the economical efficiency of the drive device can be improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of an information recording / reproducing apparatus of the present invention.

FIG. 2 is a timing chart showing the flow of information according to the above embodiment.

FIG. 3 is a schematic diagram showing a conventional information recording / reproducing apparatus.

FIG. 4 is a timing chart showing a flow of information in the conventional example.

[Explanation of symbols]

1 ... Information recording / reproducing unit, 2 ... Information recording medium, 3 ... Rotation control unit, 4 ... Recording head, 5 ... Reproducing head, 6 ... Optical pickup control unit, 7 ... Optical pickup feed control unit, 8 ...
Laser power control unit, 9 ... Power supply control unit, 13 ... Information amount compression unit, 14, 15 ... Buffer, 16 ... Information amount expansion unit.

Claims (1)

[Claims] 1. A rotation control means for rotating an information recording medium, an information writing means and an information reading means for writing and reading information to and from the information recording medium, and the information writing and reading means. An optical pickup control means for controlling focus and tracking of the optical pickup; an optical pickup feed control means for searching a predetermined address of the information recording medium and moving the optical pickup to a position of the address; and a laser power control means. Information recorded in the information recording medium via the information writing means, which is processed by the information amount compression means and temporarily stored in the temporary storage means, or information recorded in the information recording medium. Is read by the information reading means, temporarily stored in the temporary storage means, and then processed by the information expanding means to be reproduced. In the recording / reproducing apparatus, a period during which the information writing unit that operates intermittently during recording does not write information, or a period during which the information reading unit that operates intermittently during reproduction does not read information. Is detected, and the control operation is stopped for at least one of the rotation control means, the optical pickup control means, the optical pickup feed control means, and the laser power control means for a predetermined time within this period. An information recording / reproducing apparatus comprising means.