JP3227756B2 - Disk recording device, disk reproducing device, and disk recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording apparatus for recording, for example, audio data and the like on an optical disk, a disk reproducing apparatus for reproducing the audio data and the like recorded on the optical disk, and for recording and reproducing audio data and the like via the optical disk. The present invention relates to a disk recording / reproducing device.

[0002]

2. Description of the Related Art In recent years, rewritable optical disks have been widely used as recording media because of their high-speed access and semi-permanent storage of data. There are known a disk recording device for recording audio data and a disk reproducing device for intermittently reproducing audio data recorded on the optical disk.

[0003] As the rewritable optical disk,
For example, a magneto-optical disk made of a magneto-optical film is used. In the magneto-optical disk, the entire recording area is divided into a data recording area and a lead-in area, and audio data is recorded in the data recording area, and a recording start address of the audio data recorded in the data recording area, The so-called TOC (Table of Content) such as recording end address and absolute time
s) Data is recorded in the lead-in area.

The above-mentioned disk recording apparatus for intermittently recording audio data temporarily stores the audio data to be recorded in a memory, reads out the audio data once stored in this memory at predetermined intervals, and records the data intermittently. . As a method of recording the audio data, a magnetic field corresponding to the audio data is applied from, for example, the upper side of the optical disk (magneto-optical disk), and a laser beam is irradiated from the lower side of the optical disk. As a result, the portion irradiated with the laser beam rises to a so-called Curie temperature, is magnetized according to the applied magnetic field, and the desired audio data is recorded.

Further, the disc reproducing apparatus for intermittently reproducing audio data reads the TOC data from the lead-in area in advance before reproducing the audio data recorded on the optical disk. The position of each audio data recorded on the optical disc is recognized, and when the reproduction of the audio data is designated, the TOC read in advance is read.
Based on the data, a position on the optical disk where the specified audio data is recorded is accessed, and the audio data is intermittently reproduced every predetermined amount. To reproduce the audio data, a laser beam that is weaker than when the audio data was recorded is applied to the location where the audio data is recorded. Thereby, reflected light is generated from the portion irradiated with the laser beam. The reflected light is photoelectrically converted and temporarily stored in a memory as audio data. The audio data once stored in this memory is continuously read and output.

[0006]

However, the disk recording device intermittently reads a predetermined amount of audio data from the memory and records it on the optical disk as described above. From the time when the audio data is recorded on the optical disk to the time when the recording of the next predetermined amount of audio data is started, the track jump is repeated to hold the last position on the track where the previous audio data was recorded. . Until the start of the recording of the next audio data, the power consumed to maintain the last position on the track where the audio data was recorded before repeating the track jump is very wasteful.

Further, the disc reproducing apparatus intermittently reads out audio data of a predetermined amount from the optical disc and stores it in a memory as described above, and continuously reads out and outputs the audio data stored in the memory. When the audio data is not being reproduced from the optical disk, the track jump is repeated to keep the last position on the track where the audio data was reproduced before. Until the reproduction of the next audio data, the power for holding the last position on the track where the audio data was reproduced before repeating the track jump is very wasteful.

The problem of the power consumption of the disk recording device and the disk reproducing device is that when the disk recording device and the disk reproducing device are driven by a battery, the driving time such as how many hours can be continuously driven by the battery. This is a very important issue because it is directly related to

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a disk recording apparatus for recording audio data intermittently, unnecessary operation during recording of audio data is omitted, and power consumption is reduced. It is an object of the present invention to provide a disk recording device capable of saving money.

[0010] Further, the present invention provides a disk reproducing apparatus that intermittently reproduces audio data, which eliminates useless operations at the time of reproducing the audio data and can save power consumption. The purpose is to provide the device. Further, according to the present invention, in a disc recording / reproducing apparatus which intermittently records and reproduces audio data, unnecessary operations during recording and / or reproduction of the audio data can be omitted, and power consumption can be reduced. An object of the present invention is to provide such a disk recording / reproducing apparatus.

[0011]

According to the present invention, there is provided a disk recording apparatus comprising: storage means for temporarily storing recording data at a first transfer speed; and recording data once stored in the storage means for each predetermined amount. Recording means for intermittently reading and recording on an optical disk at a second transfer speed higher than the first transfer speed;
A remaining amount detecting means for detecting a remaining amount of the recording data once stored in the storage means, and a remaining amount of the recording data stored in the storing means being determined based on a detection output of the remaining amount detecting means. A power supply control means for stopping the power supply to the recording means when the value becomes equal to or less than the value is provided.

[0012] Further, a disk reproducing apparatus according to the present invention comprises:
A reproducing means for intermittently reproducing the recording data recorded on the optical disc at predetermined intervals, a storing means for temporarily storing the recording data reproduced by the reproducing means at a first transfer speed; A memory control unit for reading out the stored data once at a second transfer speed lower than the first transfer speed, a remaining amount detecting unit for detecting a remaining amount of the print data once stored in the storage unit, A reproducing unit for reproducing the recorded data recorded on the optical disk when the remaining amount of the recorded data stored in the storage unit becomes equal to or more than a predetermined value based on the detection output of the residual amount detecting unit; Power supply control means for stopping power supply to the power supply. Further, the disk recording / reproducing apparatus according to the present invention comprises a first storage means for temporarily storing the recording data at a first transfer speed, and the recording data once stored in the first storage means for each predetermined amount. A recording unit comprising recording means for reading out data intermittently on the optical disk at a second transfer speed higher than the first transfer speed; and intermittently intermittently recording data recorded on the optical disk by a predetermined amount at a third transfer speed. A reproducing means for reproducing each time, a second storing means for temporarily storing the recording data reproduced by the reproducing means at the third transfer speed, and a recording data once stored in the second storing means. A reproducing unit including a memory control unit that reads data at a fourth transfer speed lower than the third transfer speed; a remaining amount detecting unit that detects a remaining amount of recording data once stored in the first storage unit; , Recording mode When the power supply to the reproducing unit is stopped and the remaining amount of the recording data stored in the first storage unit becomes equal to or less than a predetermined value based on the detection output of the remaining amount detection unit. To
A power supply control means for stopping supply of power to the recording means for reading recording data from the first storage means and recording the data on the optical disk.

[0013]

In the disk recording apparatus according to the present invention, when recording data on the optical disk, the remaining amount of the recording data temporarily stored in the storage means is detected by the remaining amount detection means, and the recording data in the storage means is detected. When the remaining amount of data becomes equal to or less than a predetermined value, the power supply to the recording unit and the like for reading the recording data from the storage unit and recording the data on the optical disk is stopped by the power supply control unit, thereby saving power consumption. .

Further, in the disk reproducing apparatus according to the present invention, when reproducing the recording data recorded on the optical disk, the remaining amount of the recording data temporarily stored in the storage means is detected, and the recording of the storage means is performed. When the remaining amount of data becomes equal to or more than a predetermined amount, the power supply to the reproducing means for reproducing the recorded data from the optical disk and supplying the data to the storage means is stopped by the power control means, thereby saving power consumption. Plan. Further, in the disc recording / reproducing apparatus according to the present invention, in the recording mode, the power supply control means stops the power supply to the reproducing unit and reduces the remaining amount of the recording data once stored in the first storage means. Detected by the detection means,
When the remaining amount of the recording data in the first storage unit becomes equal to or smaller than a predetermined value, the power supply to the recording unit for reading the recording data from the first storage unit and recording the data on the optical disk is stopped. To save power consumption.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The disk recording device and the disk reproducing device according to the present invention can be put together as a single disk recording and reproducing device, for example, as shown in FIG.

In FIG. 1, the disk recording / reproducing apparatus includes an optical disk 1, audio data which is data to be recorded on the optical disk 1, and a so-called TOC (Table of Contents) data indicating the recording position and recorded contents of the audio data. A recording system 2 for performing recording, a display unit 3 for displaying an absolute time and the like of audio data recorded on the optical disc 1,
A keyboard 4 provided with keys and the like for designating recording and reproduction of the audio data, a system controller 5 as control means, a reproduction system 6 for reproducing the audio data recorded on the optical disc, When recording is performed, the above TO indicating the recorded content of the recorded audio data is used.
A TOC memory 27 temporarily stores the C data and temporarily stores the previously reproduced TOC data when the audio data is reproduced.

[0017] The optical disc 1 has for example a reproduction-only area A _10, as shown in FIG. 2, the recording and reproduction area A ₂₀ that is provided outside the read-only area A _10. The reproduction-only area A ₁₀ is a region in which manufacturer records the desired data, the data recording area A ₁₁ in which data such as performance information is recorded, a lead-in area A ₁₂ provided on the inner peripheral side have. In the read-only area A ₁₀ is "1" digital data is recorded as the presence or absence of pits corresponding to "0". In addition, the lead-in area A
The _12, as TOC data indicating the recording position or recording contents of the data recording area A _11, the recording start address information sequentially and recording end address information is recorded for all of the performance information.

The recording / reproducing area A ₂₀ of the optical disk 1 is
A magneto-optical recording area for the user to arbitrarily rewrite data, a data recording area A ₂₁ in which data such as performance information is recorded, and a lead-in area A ₂₂ provided on the inner peripheral side thereof. have.

The disk recording / reproducing apparatus according to the present embodiment
The recording of each data to said reproduction-only area A ₁₀ and the recording and reproduction area A _20, the main data of 32 sectors as shown in FIG. 3, the three sectors linking, 1 cluster of total 36 sectors of subdata sector This is done every time.

[0020] the lead-in area A ₂₂ is adapted TOC data indicating the recording position or recording contents of data recorded in the data recording area A ₂₁ is recorded, one sector of the sector number 00 For example, as shown in FIG. 4, the data consists of a total of 2357 bytes including a 12-byte synchronization signal, 8-byte header information, and a data area of 2332 bytes. In the data area, 8 bytes are used for one piece of recording data, and are recorded such as a recording data number (song number), an upper byte of a start cluster, a lower byte of a start cluster, a start sector, a sector number 00, and the like. You.

The recording system 2 includes a low-pass filter (LPF) 10 to which an audio signal, which is an analog signal to be recorded on the optical disk 1, is supplied via an input terminal 7;
An A / D converter 11 for digitizing an audio signal from the PF 10 to form audio data, and an ATRAC (Adaptive Tr) described later in the audio data from the A / D converter 11.
AT which performs ansform Acoustic Coding) encoding
A RAC encoder 12, a RAM 13 for temporarily storing the ATRAC-encoded audio data,
An encoder 14 for performing EFM encoding or the like on the audio data read from the M13; a magnetic head drive circuit 15 for forming a modulation magnetic field corresponding to the audio data from the encoder 14; A magnetic head 16 for applying a modulating magnetic field to the optical disc 1 in accordance with the modulating magnetic field, a spindle motor 17 for driving the optical disc 1 to rotate at a constant linear velocity, for example, and a laser beam at a position where the magnetic field is applied by the magnetic head 16 , An RF circuit 19 for extracting a focus error signal and a tracking error signal from the output of the optical head 18, a focus servo and a tracking servo of the optical head 18, and a rotation of the spindle motor 17. And a servo control circuit 20 for controlling the servo and the like. There.

The reproducing system 6 includes a spindle motor 17 for driving the optical disk 1 to rotate at a constant linear velocity, for example.
An optical head 18 for irradiating a portion where the audio data is recorded with a laser beam weaker than at the time of recording the audio data and photoelectrically converting the reflected light to form audio data;
RF circuit 19 for extracting a focus error signal and a tracking error signal from the output of the optical head 18
A servo control circuit 20 for controlling a focus servo and a tracking servo of the optical head 18, a rotation servo of the spindle motor 17, and the like, and an EFM decoding to an output from the optical head 18 via the RF circuit 19. A decoder 21 for performing processing and the like; and a RAM 22 for temporarily storing audio data decoded by the decoder 21
And the audio data read from the RAM 22
An ATRAC decoder 23 for performing RAC decoding processing;
A D / A converter 24 for converting the audio data from the ATRAC decoder 23 into an analog signal to form an audio signal; an LPF 25 for removing and outputting a high frequency component from the audio signal from the D / A converter 24; 23
And a digital output circuit 26 for digitally outputting the audio data from the digital output as it is.

The RAM 1 provided in the recording system 2
3 and the RAM 22 provided in the reproduction system 6 constitute storage means. The spindle motor 17, optical head 18, RF circuit 19, and servo control circuit 20
Are shared by the recording system 2 and the reproduction system 6. The encoder 14 to the magnetic head 16 and the optical head 18 in the recording system 2 constitute recording means for reading audio data from the RAM 13 and recording the audio data on the optical disk 1.
The RF circuit 19 and the servo control circuit 20 constitute a rotation drive control unit for the optical disc 1.

The optical head 18 and the decoder 21 in the reproducing system 6 constitute a reproducing means for reproducing the audio data from the optical disk 1 and supplying it to the RAM 22 as the storage means. Motor 1
7, the RF circuit 19 and the servo control circuit 20 constitute a rotation drive control means for the optical disc 1.

The system controller 5, which is a control means provided in the disk recording / reproducing apparatus according to this embodiment, will be described later in detail. In the recording mode for recording audio data on the optical disk 1, The power supply to the decoder 21 to the digital output circuit 26 of the reproduction system 6 is controlled to be turned off, and the remaining amount of the recording data temporarily stored in the RAM 13 is detected. In this case, the power supplied to the encoder 14 to the magnetic head 16 and the optical head 18 as the recording means, and the power supplied to the spindle motor 17, the RF circuit 19 and the servo control circuit 20 as the rotation drive control means Control each off.

Further, the system controller 5 operates the LPF 10 of the recording system 2 and the magnetic head 1 in the reproduction mode for reproducing the audio data recorded on the optical disk 1.
6 is turned off and the RAM 2 is turned off.
A power supply to be supplied to the optical head 18 and the decoder 21 serving as the reproducing means when the remaining amount of audio data once stored in The power supply to the spindle motor 17, the RF circuit 19, and the servo control circuit 20, which are the rotation drive control means, is turned off.

Next, the operation of the disk recording and reproducing apparatus according to the present embodiment in the recording mode for recording a desired audio data to the recording and reproduction area A ₂₀ of the optical disk 1. This recording mode is specified by the keyboard 4 shown in FIG.
The recording key is provided by turning on a recording key. When the recording key is turned on, the optical disc 1 is rotated by the spindle motor 17 so as to have a constant angular velocity or a constant linear velocity, for example.
A desired audio signal, which is an analog signal, is supplied to the A / D converter 11 via the input terminal 7 and the LPF 10.
The spindle motor 17 is controlled by the servo control circuit 20 so as to rotate constantly.

The A / D converter 11 quantizes the audio signal, and 2CH × 16 bits × 44.1 kHz ≒ 1.
The audio data having a data rate of 4 Mbit / sec is formed and supplied to the ATRAC encoder 12.

The ATRAC encoder 12 quantizes the audio signal by the A / D converter 11 to 1.4.
For audio data at a data rate of Mbit / sec, a maximum of about 20 msec of data is defined as one block.
The waveform on the time axis is analyzed into about 1,000 components on the frequency axis by a so-called orthogonal transformation, and the frequency components that are important for hearing are extracted in order to form audio data having a data rate of 300 kbit / sec. That is, the above 1.4 Mbi
The audio data at the data rate of t / sec is 1/5
A process of compressing audio data at a data rate of 0 kbit / sec (hereinafter referred to as compressed data) is performed, and the data transfer rate is converted from 75 sectors / second in the standard CD-DA format to 15 sectors / second. This compressed data is supplied to the RAM 13.

The RAM 13 is controlled by the system controller 5 to write and read data, and is used as a buffer memory for temporarily storing the compressed data supplied from the ATRAC encoder 12. That is, the above ATRAC
The data transfer rate of the compressed data supplied from the encoder 12 is reduced to 1/5 of the standard data transfer rate of 75 sectors / second, that is, 15 sectors / second. Written continuously. For this compressed data, it is sufficient to record one sector for every five sectors. However, such recording every five sectors is practically impossible. Therefore, continuous recording of sectors as described later is performed. This recording is performed in bursts at a data transfer rate of 75 sectors / second using the one cluster as a recording unit through a recording stop period described later. That is, in the RAM 13, compressed data continuously written at a low transfer rate of 15 (= 75/5) sectors / second corresponding to the bit compression rate is read in a burst at the transfer rate of 75 sectors / second. It is. For the read and recorded data, the overall data transfer speed including the recording stop period is as low as 15 sectors / second, but within the time of the burst-like recording operation. The instantaneous data transfer rate is 75 sectors / sec.

The compressed data read from the RAM 13 in a burst at the transfer rate of 75 sectors / second is supplied to an encoder 14.

The encoder 14 performs encoding processing (parity addition and interleaving processing) for error correction, EFM encoding processing, and the like on the compressed data supplied in a burst form from the RAM 13 as described above.
The audio data encoded by the encoder 14 is supplied to the magnetic head drive circuit 15. The magnetic head drive circuit 15 drives the magnetic head 16 so as to apply a magnetic field modulation according to the compressed data to the optical disc 1.

On the other hand, the system controller 5 performs the above-described memory control on the RAM 13 and continuously stores the compressed data read from the RAM 13 in a burst on the recording track of the optical disk 1 by the memory control. The recording position is controlled so that the recording is performed. The control of the recording position is performed by the system controller 5 managing the recording position of the compressed data read out from the RAM 13 in a burst manner and transmitting a control signal designating a recording position on a recording track of the optical disc 1 to the servo control. This is done by supplying the circuit 20.

That is, in this disk recording / reproducing apparatus, the audio data output from the A / D converter 11 has a sampling frequency of 44.1 kHz, a quantization bit number of 16 bits, and a data transfer rate of 74 sectors / second. Audio PCM data. This is the ATRA
Is supplied to the C encoder 12 and the data transfer rate is 1
/ 5 compressed data at 15 sectors / sec. The compressed data continuously output from the ATRAC encoder 12 at a transfer rate of 15 sectors / second is the RA data.
M13.

Then, the system controller 5
As shown in FIG. 5, the compressed data is stored in the RAM 13 by continuously incrementing the write pointer W of the RAM 13 at a transfer rate of 15 sectors / second.
Writes continuously at a transfer rate of sectors / sec.
When the data amount of the compressed data stored in the RAM 3 exceeds a predetermined amount K, the read pointer R of the RAM 13 is burst-incremented at a transfer rate of 75 sectors / sec. Predetermined amount K
Only the memory control is performed such that the data is read out in bursts at the transfer rate of 75 sectors / second.

By the above-mentioned memory control by the system controller 5, the ATRAC encoder 1
RAM 1 at a transfer rate of 2 to 15 sectors / sec, for example.
3 when the data amount of the compressed data stored in the RAM 13 exceeds a predetermined amount K.
Since the compressed data is read out of the AM 13 as recording data in a burst of a predetermined amount K at a transfer rate of 75 sectors / second, the input data is always stored in the RAM 13 while a data write area of a predetermined amount or more is secured. The data can be continuously written to the RAM 13.

The system controller 5 controls the RA
The recording position on the recording track of the optical disc 1 is controlled so that the recording data read in a burst from the M13 is recorded on the recording track of the optical disc 1 in a continuous state. In this case, as described above, the RAM 13
Since a data write area equal to or more than a predetermined amount is always secured, even if the system controller 5 detects that a track jump or the like has occurred due to disturbance or the like and interrupts the recording operation on the optical disc 1, The input data can be continuously written in the data write area equal to or more than the fixed amount, and the return processing operation can be performed during that time, so that the input data can be continuously recorded on the recording tracks of the optical disc 1.

The optical head 18 includes a laser light source 31 such as a laser diode, a collimator lens 32, a beam splitter 33, and an objective lens 3, as shown in FIG.
4. Optical components such as the polarization beam splitter 35, the first and second photodetectors 36 and 37 for detecting the light separated by the polarization beam splitter 35, and the addition and synthesis of the respective detection outputs from the photodetectors 36 and 37. It comprises a single signal combiner 38 and a first signal combiner 39 for subtracting and combining the respective detection outputs, and is provided at a position facing the magnetic head 16 with the optical disc 1 interposed therebetween.

The optical head 18 is used for the optical disc 1
When recording data to the recording and reproducing area A ₂₀ of, irradiating the target track of the optical disc 1 a modulated magnetic field that the magnetic head 16 according to the recorded data is driven by the magnetic head driving circuit 15 is applied Is used to perform data recording by thermomagnetic recording. The optical head 18 detects a focus error by, for example, a so-called astigmatism method by detecting reflected light of a laser beam applied to a target track in a recording mode and a reproducing mode described later. The tracking error is detected by a so-called push-pull method.

The changeover switch 40 provided on the optical head 18 is controlled to be switched by the system controller 5, and in this recording mode, the selection terminal 40a is controlled to select the selected terminal 40c. You. Thus, in this recording mode,
A combined signal from a first signal combiner 38 obtained by adding and combining respective detection outputs from the photodetectors 36 and 37 is shown in FIG.
Is supplied to the RF circuit 19 shown in FIG.

The RF circuit 19 includes the optical head 18
A focus error signal and a tracking error signal are extracted from the output of (1) and supplied to the servo control circuit 20, and the reproduced signal is binarized and supplied to a decoder 21 described later.

The servo control circuit 20 comprises, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a thread servo control circuit and the like. The focus servo control circuit controls the focus of the optical system of the optical head 18 so that the focus error signal becomes zero. Further, the tracking servo control circuit performs tracking control of the optical system of the optical head 18 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 17 so as to rotate the optical disc 1 at the constant angular velocity or the constant linear velocity. Further, the thread servo control circuit moves the optical head 18 and the magnetic head 16 to target track positions of the optical disk 1 designated by the system controller 5.

The servo control circuit 20 that performs such various control operations supplies the system controller 5 with information indicating the operating state of each unit controlled by the servo control circuit 20.

The system controller 5 controls each of the control circuits in accordance with information indicating the operation state of each of the units, thereby controlling the optical head 18 and the magnetic head 16.
Manages the recording position on the recording track that is being traced, and manages the reproducing position on the recording track in the reproduction mode described later.

The system controller 5 automatically stores a TOC data table including TOC data indicating the recording position and the like of the data recording area A ₂₁ of the recording / reproducing area A _{20 in} the TOC memory 27 during the recording of such audio data. formed by, performs control to record the read the lead-in area a ₂₂ of this together with the recording end of the audio data.

Here, as described above, the disk recording / reproducing apparatus reads out the audio data once stored in the RAM 13 at a predetermined amount K in the recording mode and intermittently records the audio data on the optical disk 1 as described above. Therefore, the predetermined amount K
The interval between the reading and recording of the audio data of the predetermined amount K and the subsequent reading and recording of the audio data of the predetermined amount K is increased (recording stop period). For this reason, when the system controller 5 enters the recording mode, the system controller 5 controls the power supply to the decoder 21 to the digital output circuit 26 of the reproducing system 6 which is not necessary for recording the audio data to be turned off, and the system controller 5 The remaining amount of audio data temporarily stored and read out in the RAM 13 is detected, and when the remaining amount of audio data becomes equal to or less than a predetermined amount, the recording is stopped and supplied to the encoder 14 to the magnetic head 16 and the optical head 18 as the recording stop period. And the power supplied to the spindle motor 17, the RF circuit 19 and the servo control circuit 20 are turned off.

More specifically, assuming that the recording mode is set at time t1 in FIG. 7A, the system controller 5 controls the decoder 21 to the digital output circuit of the reproduction system 6 which is unnecessary for recording the audio data. The power supply to the recording system 2 is turned off, the power supply to the LPF 10 to the RAM 13 of the recording system 2 is turned on, and the encoder 14 to the servo circuit 2 of the recording system 2 are started from time t1 in FIG.
Control is performed to start power supply to 0.

When the supply of power to the encoder 14 to the servo circuit 20 is started, the servo control circuit 20 is activated from time t2 in FIG. 7B, and the spindle motor 17 is driven to rotate at a constant linear velocity, for example. The encoder 14 performs the above-described encoding processing on the audio data read from the RAM 13 at time t2 in FIG. 3C and outputs the data. The magnetic head 16 and the optical head start at time t3 in FIG. 18 is accessed to the specified address. Then, the recording of the audio data is started from time t3 in FIG. Recording of such audio data is performed according to the above RA.
Since the audio data is read out from M13 for each predetermined amount k, the remaining amount of the audio data is reduced from time t3 when the recording of the audio data is started, as shown in FIG.
The system controller 5 detects the remaining amount of audio data in the RAM 13 and, when the remaining amount of audio data becomes equal to or less than a predetermined amount G as shown at time t4 in FIG. And the power supply to the encoder 14 to the servo control circuit 20 of the recording system 2 is stopped as shown in FIG. As a result, as shown in FIGS. 7B to 7E, the rotation of the spindle motor 17 is stopped, the encoding process of the encoder 14 is stopped, and the magnetic head 16 and the optical head 18 move to the end of the audio data. It stops near the address where the recording was performed, and the recording of audio data stops.

The system controller 5 stores the last recording address of the audio data when the power supply to the encoder 14 to the servo control circuit 20 is stopped.

At time t4 shown in FIG.
When the reading of the audio data from the RAM 13 is stopped and the power supply to the encoder 14 to the servo control circuit 20 is stopped, the remaining amount of the audio data in the RAM 13 increases from time t4 in FIG. . When the remaining amount of the audio data becomes equal to or more than the predetermined amount H as shown at time t5 in FIG. 7F, the system controller 5 re-enters the encoder 14 as shown in FIG. To start supplying power to the servo control circuit 20,
3 to start reading the audio data.

As a result, the servo control circuit 20 is activated from time t6 in FIG. 7B, and the spindle motor 17 is driven to rotate again from time t6 in FIG.
The encoder 14 performs the above-described encoding process on the audio data read out from the audio data 3 and outputs the encoded data. From time t7 in FIG. An access is made to the last address of the recording. Then, the recording of the audio data starts at time t7 in FIG.

Then, the system controller 5
As described above, the remaining amount of audio data in the RAM 13 is detected, and when the remaining amount of data in the RAM 13 becomes equal to or less than the predetermined amount G as shown at time t8 in FIG. Then, the power supply to the encoder 14 to the servo control circuit 20 is stopped. The system controller 5 repeats the above power-on / off control during the recording mode.

Note that, as described above, the encoders 14 to
When the power supply to the servo control circuit 20 is stopped, the recording end address of the audio data is stored in the system controller 5, and the magnetic head 16 and the optical head 18 stop near the recording end address. Therefore, the magnetic head 16 and the optical head 18 can easily and quickly access the recording end address.

In the recording mode, the R
When the remaining data amount of the AM 13 becomes 0, the power supply to the encoder 14 to the servo control circuit 20 is not stopped, but before the remaining data amount becomes 0 (the remaining data amount becomes the predetermined amount G). ), The recording of the audio data is stopped. Therefore, when the recording of the audio data cannot be performed due to, for example, vibration or the like, the audio data once stored in the RAM is read again and recorded again. Do it again,
Re-recording can be performed. When such a re-recording system is not adopted, the power supply to the encoder 14 to the servo control circuit 20 may be stopped when the remaining amount of data in the RAM 13 becomes zero.

As described above, in the recording mode, the system controller 5 detects the remaining amount of audio data in the RAM 13 and determines that the remaining amount of audio data is the predetermined amount G.
When the following conditions are satisfied, the power supply to the encoder 14 to the magnetic head 16 and the optical head 18 and the power supply to the spindle motor 17, the RF circuit 19 and the servo control circuit 20 are turned off. By controlling, when the audio data is not recorded on the optical disc 1, the track jump is repeated during the recording stop period, and the last position on the track where the audio data was recorded previously is wasted. Operation can be omitted, and power consumption can be saved.

Therefore, when the disk recording / reproducing apparatus is driven by a battery, the battery life can be extended, and the drive time can be prolonged.

Next, the read-only area A of the optical disc 1
₁₀ and illustrating the operation of the recording and reproduction area A at ₂₀ reproduction mode for reproducing the audio data continuously recorded on the recording track of the disk recording and reproducing apparatus. When the optical disk 1 is set in the disk recording / reproducing apparatus, the system controller 5 drives the optical disk 1 in advance to rotate at a constant linear velocity, and reproduces the data area A ₁₁ of the reproduction-only area A ₁₀ of the optical disk 1. to manage the position, stores the TOC memory 27 to reproduce the TOC data from the lead-in area a ₁₂ of the reproduction only area a _10, managing the reproduction position with respect to the data area a ₂₁ in the recording and reproduction area a ₂₀ Therefore, the lead-in area A of the recording / reproducing area A _20
The TOC data including the date and time data as described above is reproduced from ₂₂ and stored in the TOC memory 27, and the keyboard 4
Of the reproduction mode designated by the operation of turning on the reproduction key provided in.

The system controller 5 reproduces TOC data from the lead-in area A ₁₂ of the read-only area A ₁₀ and the lead-in area A ₂₂ of the recording / reproducing area A ₂₀ , and according to each TOC data. Control is performed so that each recorded content is displayed on the display unit 3.

Next, when the reproduction key is turned on and the reproduction mode is designated, the system controller 5
The optical disc 1 is rotationally driven by rotating the spindle motor 17 at a constant linear velocity, and the TOC data corresponding to the specified audio data stored in the TOC memory 27 is read out, and according to the read TOC data. The optical head 18 is controlled so as to move to the position where the designated audio data is recorded.

The optical head 18 is mounted on the optical disc 1
When reproducing data from the read-only area A ₁₀ of the can obtain a reproduced signal by detecting the light amount change of reflection light from the target track of the laser light, the first of each detection output of the photodetector 36 The reproduction signal added and synthesized by the first signal synthesizer 38 is supplied to the RF circuit 19 via the changeover switch 40. Also,
When reproducing data from the recording and reproducing area A ₂₀ of the optical disc 1, it is possible to obtain a reproduced signal by detecting the difference in polarization angle of the reflected light from the target track of the laser beam (Kerr rotation angle), the photodetector 36,3
7 are subtracted from the respective detection outputs by the second signal synthesizer 39, and the reproduced signal is output via the changeover switch 40.

The reproduced signal output through the changeover switch 40 is binarized by the RF circuit 19 and supplied to the decoder 21.

The decoder 21 is provided with the encoder 14
The reproduction output binarized by the RF circuit 19 is subjected to the above-described decoding processing for error correction, EFM decoding processing, and the like. The data is reproduced at a transfer speed of / sec and supplied to the RAM 22 as reproduced data. RA above
In M22, data writing and reading are controlled by the system controller 5, and reproduced data supplied from the decoder 21 at a transfer rate of 75 sectors / second is written in a burst at the transfer rate of 75 sectors / second. The reproduction data written in a burst at the transfer rate of 75 sectors / second is continuously read from the RAM 22 at a transfer rate of 15 sectors / second.

The system controller 5 writes the reproduced data into the RAM 22 at a transfer rate of 75 sectors / second, and performs a memory control to continuously read out the written reproduced data at the transfer rate of 15 sectors / second. At the same time, the playback position is controlled so that the playback data written in a burst from the RAM 22 by the memory control is continuously played back from the recording track of the optical disc 1. The control of the reproduction position is performed by the system controller 5 managing the reproduction position of the reproduction data read out from the RAM 22 in a burst manner and transmitting a control signal designating a reproduction position on a recording track of the optical disc 1 to the servo control. This is done by supplying the circuit 20.

That is, the system controller 5
As shown in FIG. 8, the write pointer W of the RAM 22 is incremented at a transfer rate of 75 sectors / second, and the reproduced data is written into the RAM 22 at a transfer rate of 75 sectors / second. When the pointer R is continuously incremented at a transfer rate of 15 sectors / sec, the reproduction data is continuously read from the RAM 22 at a transfer rate of 15 sectors / sec, and when the write pointer W catches up with the read pointer R, The writing is stopped, and when the data amount of the reproduction data stored in the RAM 22 becomes equal to or less than a predetermined amount L, the write pointer W of the RAM 22 is incremented in a burst at a transfer rate of 75 sectors / second so that the writing is performed. To perform memory control.

Under such memory control by the system controller 5, the compressed data reproduced from the recording track of the optical disk 1 is burst-written to the RAM 22 at a transfer rate of 75 sectors / sec.
Since the compressed data is continuously read from M13 as reproduction data at a transfer rate of 75 sectors / second,
The reproduction data can be continuously read from the RAM 22 while always securing a data read area of a predetermined amount L or more in the RAM 22 for the RAM 13. The reproduction data read from the RAM 22 in a burst manner can be reproduced in a continuous state from the recording tracks of the optical disk 1 by controlling the reproduction position on the recording tracks of the optical disk 1 by the system controller 5. I can do it. In addition, since the RAM 22 always has a data read area equal to or larger than the predetermined amount L in the RAM 22, the system controller 5 detects that a track jump or the like has occurred due to disturbance or the like, and reproduces data from the optical disk 1. Even when the operation is interrupted, the reproduction data can be read from the data read area having the predetermined amount K or more and the output of the analog signal can be continued, and the return processing operation can be performed during that time.

The compressed data obtained as read data continuously read from the RAM 22 at a transfer rate of 15 sectors / second is supplied to the ATRAC decoder 23.
The ATRAC decoder 23 corresponds to the ATRAC encoder 12, and in the operation mode specified by the system controller 5, for example, expands the compressed data by a factor of 5 to obtain digital data having a transfer rate of 75 sectors / second. Is formed, and this is D /
It is supplied to the A converter 24 and the digital output circuit 26, respectively.

The D / A converter 24 is provided with the ATRAC
The audio data supplied from the decoder 23 is converted into an analog signal to form an audio signal, which is output via the low-pass filter 25. The audio signal that has passed through the low-pass filter 25 is extracted from the output terminal 9. The digital output circuit 26 directly outputs the audio data supplied from the ATRAC decoder 23 as audio data. The audio data output from the digital output circuit 26 is taken out from the output terminal 8.

Here, as described above, the disc recording / reproducing apparatus reads out audio data from the optical disc 1 for each predetermined amount K during the reproduction mode, temporarily stores the data in the RAM 22, and temporarily stores the audio data once stored in the RAM 22. Read and output data continuously. Therefore, a predetermined amount K of audio data is read from the optical disc 1 and the RAM 2 is read.
2 once, and then an interval is opened until a predetermined amount K of audio data is read from the optical disk 1 (playback stop period). Therefore, the system controller 5
In the reproduction mode, the power supply to the LPF 10 to the magnetic head 16 of the recording system 2 that is unnecessary for reproducing the audio data is controlled to be turned off, and the R of the reproduction system 2 is controlled.
A power supply for supplying the optical head 18 and the decoder 21 as the reproduction stop period when the remaining amount of the audio data once stored and read out to the AM 22 is equal to or more than a predetermined amount; The power supply to the spindle motor 17, the RF circuit 19, and the servo control circuit 20 is turned off.

Specifically, the system controller 5
Assuming that the reproduction mode is started from time t11 in FIG. 9A, the recording system 2 unnecessary for reproducing the audio data
The power supply to the LPF 10 to the magnetic head 16 is controlled to be turned off, so that the power supply to the spindle motor 17 to the decoder 21 is started and the power supply to the RAM 22 to the digital output circuit 26 is started.

The spindle motor 17 to the decoder 21
When the power supply to the RAM 22 to the digital output circuit 26 is started, the servo control circuit 20 is activated from time t12 in FIG. 9B, and the spindle motor 17 is driven to rotate at a constant linear velocity, for example. At the same time, the decoder 21 is driven from time t12 in FIG.
From time t13 in FIG. 9C, the optical head 18 is accessed to the designated address, and time t1 in FIG. 9D.
From 3, the reproduction of the audio data on the optical disk 1 is started.

Since the reproduction of the audio data is performed by reading the audio data from the optical disk 1 at every predetermined amount k, the reproduction of the audio data from the optical disk 1 is started as shown in FIG. From the time t13
The remaining amount of audio data once stored in the AM 22 increases. The system controller 5 detects the remaining amount of audio data in the RAM 22, and when the remaining amount of audio data becomes equal to or more than a predetermined amount M as shown at time t14 in FIG. The power supply to the spindle motor 17 to the decoder 21 is stopped as shown in FIG. As a result, as shown in FIG.
7 stops, the optical head 18 stops at an address near the stop of the power supply as shown in FIG. 3C, and the sound from the optical disc 1 as shown in FIG. The reproduction of the data is stopped, and the decoding process of the decoder 21 is stopped as shown in FIG.

Even if the power supply to the spindle motor 17 to the decoder 21 is stopped, the system controller 5 supplies power to the RAM 22 to the digital output circuit 26 throughout the reproduction mode. And control so that the output audio data is not interrupted.
Further, the system controller 5 operates when the power supply to the spindle motor 17 to the decoder 21 is stopped.
The reproduction end address of the audio data is stored.

When the power supply to the spindle motor 17 to the decoder 21 is stopped at the time t14 shown in FIG. 9A, the reading of the audio data from the optical disk 1 is stopped. From time t14, R
The remaining amount of audio data in the AM 22 decreases. The system controller 5 determines that the remaining amount of the audio data is as shown in FIG.
When the amount becomes equal to or less than the predetermined amount L as shown at time t15 in (f), control is performed so that power supply to the spindle motor 17 to the decoder 21 is started again as shown in FIG. . As a result, the servo control circuit 20 starts operating at time t16 in FIG. 9B, and the spindle motor 17 is driven to rotate again. The decoder 21 is driven from time t16 in FIG. From time t17,
The optical head 18 is accessed to the last reproduction address where the audio data was reproduced before, and the time t1 in FIG.
7, the reproduction of the audio data is restarted.

As a result, the remaining amount of audio data in the RAM 22 increases again from time t17 in FIG. 9 (f). The system controller 5 detects the remaining amount of the audio data, and when the remaining amount of data in the RAM 22 becomes equal to or more than the predetermined amount M as shown at time t18 in FIG. Then, the power supply to the spindle motor 17 to the decoder 21 is stopped.

The system controller 5 repeats such control in the reproduction mode.

As described above, when the power supply to the spindle motor 17 to the decoder 21 is stopped, the reproduction end address of the audio data is stored in the system controller 5, and the optical head 18 Since the optical head 18 stops near the address where the audio data was reproduced previously, the optical head 18 can easily and quickly access the last reproduction address where the audio data was reproduced previously.

As described above, in the reproduction mode, the system controller 5 detects the remaining amount of audio data in the RAM 22 and determines that the remaining amount of audio data is the predetermined amount M.
The above-mentioned time is defined as the reproduction stop period, and the power supplied to the optical head 18 and the decoder 21 and the power supplied to the spindle motor 17, the RF circuit 19, and the servo control circuit 20 are controlled to be off. In addition, it is possible to omit a wasteful operation of repeating a track jump during the above-described reproduction stop period and holding the last position on the track where the audio data has been reproduced earlier, thereby saving power consumption.

Therefore, when the disk recording / reproducing apparatus is driven by a battery, the battery life can be extended, and the drive time can be prolonged.

As is apparent from the above description, in the disc recording / reproducing apparatus according to the present embodiment, in the recording mode, the system controller 5 operates the decoders 21 to 21 of the reproducing system 6 which are unnecessary for recording the audio data. The power supply to the digital output circuit 26 is turned off, the remaining amount of audio data in the RAM 13 is detected, and when the remaining amount of audio data becomes a predetermined amount G or less, the recording stop period is set as the recording stop period. 14 to turn off the power supplied to the magnetic head 16 and the optical head 18 and the power supplied to the spindle motor 17, the RF circuit 19 and the servo control circuit 20, respectively, so that the next audio data The track jump is repeated until the last audio track is recorded. Can omit the unnecessary operation for holding, it is possible to save power consumption.

Therefore, when the disk recording / reproducing apparatus is driven by a battery, the battery life can be extended, and the drive time can be prolonged.

In the reproduction mode, the system controller 5 controls the power supply to the LPF 10 to the magnetic head 16 of the recording system 2 which is not necessary for reproducing the audio data to be turned off, and the RAM 22 of the reproduction system 2 To detect the remaining amount of audio data once stored and read out,
When the remaining amount of audio data becomes equal to or more than a predetermined amount, the reproduction stop period is set as the power supply to be supplied to the optical head 18 and the decoder 21 and the spindle motor 1
7, by turning off the power supply to the RF circuit 19 and the servo control circuit 20, respectively, the track jump is repeated during the reproduction stop period, and the last position on the track where the audio data was reproduced previously is held. Useless operation can be omitted, and power consumption can be saved.

Therefore, when the disk recording / reproducing apparatus is driven by a battery, the battery life can be extended and the drive time can be prolonged.

In the disc recording / reproducing apparatus of the above-described embodiment, for example, the power consumed when reproducing the audio data from the optical disc 1 is 1 W, and the power consumed when outputting the reproduced audio data is 100 mW. age,
The recording duty of the above intermittent audio data is reduced to 1/4.
By performing power-off control during the above-described reproduction stop period when reproducing as described above, the power consumption is conventionally 1W + 100mW = 1.1W. However, in the disk recording / reproducing apparatus according to the present embodiment, 1W × (1 / 4) +100 mW = 0.35 W, which means that audio data can be reproduced from the optical disc 1 with approximately one-third of the conventional power consumption, and power consumption can be sufficiently reduced.

[0084]

In the disk recording apparatus according to the present invention, when recording data on the optical disk, the remaining amount of the recording data once stored in the storage means is detected by the remaining amount detection means, When the remaining amount of the recording data becomes equal to or less than a predetermined value, the power supply to the recording unit for reading the recording data from the storage unit and recording on the optical disk is stopped by the power supply control unit, thereby saving power consumption. Can be achieved. Therefore, this disk recording device can be driven for a long time by a battery.

Further, in the disk reproducing apparatus according to the present invention, when reproducing the recording data recorded on the optical disk, the remaining amount of the recording data temporarily stored in the storage means is detected, and the recording of the storage means is performed. When the remaining amount of data becomes equal to or more than a predetermined amount, the power supply to the reproducing means for reproducing the recorded data from the optical disk and supplying the data to the storage means is stopped by the power control means, thereby saving power consumption. Can be achieved. Therefore, this disk reproducing apparatus can be driven for a long time by a battery.

Further, in the disk recording / reproducing apparatus according to the present invention, in the recording mode, power supply to the reproducing section is stopped by the power supply control means, and the remaining amount of the recording data temporarily stored in the first storage means. Is detected by the remaining amount detecting means, and when the remaining amount of the recording data in the first storing means becomes a predetermined value or less, the recording data is read out from the first storing means and recorded on the optical disk. By stopping power supply to the means and the like, power consumption can be saved. Therefore, this disk recording / reproducing apparatus can be driven for a long time by a battery.

As described above, according to the present invention, it is possible to provide a disk recording device, a disk reproducing device, and a disk recording / reproducing device which can save power consumption and can be driven for a long time by a battery.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a disk recording / reproducing apparatus in which a disk recording apparatus and a disk reproducing apparatus according to the present invention are combined into one apparatus.

FIG. 2 is a schematic plan view for explaining a structure of an optical disc provided in the disc recording / reproducing apparatus of the embodiment.

FIG. 3 is a diagram showing a recording state of recording data of one cluster recorded on the optical disc.

FIG. 4 is a diagram showing a specific recording form of TOC data recorded on the optical disc.

FIG. 5 is a diagram showing a state of a memory for explaining memory control in a recording mode of the disk recording / reproducing apparatus of the embodiment.

FIG. 6 is a block diagram of an optical head provided in the disk recording / reproducing apparatus of the embodiment.

FIG. 7 is a time chart for explaining a power supply state to each unit in a recording mode of the disk recording / reproducing apparatus of the embodiment.

FIG. 8 is a diagram showing a state of a memory for explaining a memory control in a reproducing mode of the disk recording / reproducing apparatus of the embodiment.

FIG. 9 is a time chart for explaining a power supply state to each unit in the reproduction mode of the disk recording / reproducing apparatus of the embodiment.

[Explanation of symbols]

1 ··· Optical disk 2 ··· Recording system 3 ····· Display unit 4 ··· ... Keyboard 5 ... System controller 6 ... Reproduction system 10 ... ··································· A / D converter 12 ········· ATRAC encoder 13 ········ · · · · RAM 14 · · · Encoder 15 · · Magnetic head drive circuit 16 · · · Magnetic head 17 Spindle motor 18 Optical head 19 RF amplifier 20・ ・ ・ ・ ・ ・ ・··· Servo control circuit 21 ··· Decoder 22 ··· RAM 23 ··· ATRAC decoder 24 ··· D / A converter 25 ··· Low pass filter 26 ··· Digital output circuit A ₁₀ ............ playback only area A ₁₁ ............ data area A ₁₂ ............ lead-in area A ₂₀ ···· Recording / playback area A ₂₁ ··· Data area A ₂₂ ··· Lead-in area

Claims (13)

(57) [Claims] 1. A storage means for temporarily storing print data at a first transfer speed, and read out the print data once stored in the storage means at a second transfer speed higher than the first transfer speed for each predetermined amount. Recording means for intermittently recording on an optical disc; remaining amount detecting means for detecting the remaining amount of recording data once stored in the storage means; and a storage means based on a detection output of the remaining amount detecting means. A disk recording apparatus comprising: a power supply control unit that stops power supply to the recording unit when the remaining amount of stored recording data becomes equal to or less than a predetermined value. 2. An apparatus according to claim 1, further comprising an encoding unit for performing an encoding process on the recording data stored in said storage unit, wherein said power control unit is stored in said storage unit based on a detection output of said remaining amount detection unit. 2. The disk recording apparatus according to claim 1, wherein the power supply to the encoding means is further stopped when the remaining amount of the recording data is lower than a predetermined value. 3. The power supply control means, when the remaining amount of recording data stored in the storage means becomes a predetermined value or less, based on a detection output of the remaining amount detection means, rotates the optical disk. 2. The disk recording apparatus according to claim 1, wherein the power supply to the driving means is further stopped. 4. The power supply control means, when the remaining amount of the recording data stored in the storage means becomes equal to or less than a predetermined value, based on the detection output of the remaining amount detection means, 2. The disk recording apparatus according to claim 1, wherein the power supply to the servo control means for performing the servo control is further stopped. 5. The optical disc drive according to claim 1, wherein the power supply control means controls the optical disk when the remaining amount of the recording data stored in the storage means becomes equal to or less than a predetermined value based on the detection output of the remaining amount detection means. 2. The disk recording apparatus according to claim 1, wherein the power supply to the optical head for irradiating light is further stopped. 6. The power supply control means, when the remaining amount of recording data stored in the storage means becomes equal to or less than a predetermined value, based on a detection output of the remaining amount detection means, a magnetic field on the optical disk. 2. The disk recording apparatus according to claim 1, wherein the power supply to the magnetic head to which the voltage is applied is further stopped. 7. A reproducing means for intermittently reproducing recording data recorded on an optical disk at predetermined intervals, and a storage means for temporarily storing the recording data reproduced by the reproducing means at a first transfer speed. A memory control unit for reading out the recording data once stored in the storage unit at a second transfer speed lower than the first transfer speed; and a remaining unit for detecting a remaining amount of the recording data once stored in the storage unit. Based on the detection output of the remaining amount detecting means, when the remaining amount of the recording data stored in the storage means has become equal to or greater than a predetermined value, the amount of the recording data recorded on the optical disc. A disk reproducing apparatus comprising a power control means for stopping power supply to a reproducing means for performing reproduction. 8. A power supply control means for decoding the recording data reproduced by the reproduction means, wherein the power control means is stored in the storage means based on a detection output of the remaining amount detection means. 8. The disk reproducing apparatus according to claim 7, wherein the power supply to the decoding means is further stopped when the remaining amount of the recorded data becomes equal to or more than a predetermined value. 9. The power supply control means, when the remaining amount of recording data stored in the storage means becomes a predetermined value or more based on a detection output of the remaining amount detection means, rotates the optical disk. 8. The disk reproducing apparatus according to claim 7, wherein the power supply to the rotating drive unit to be driven is further stopped. 10. The power supply control means, when the remaining amount of recording data stored in the storage means becomes equal to or more than a predetermined value, based on the detection output of the remaining amount detection means, 8. The disk reproducing apparatus according to claim 7, wherein the power supply to the servo control means for performing the servo control is further stopped. 11. The optical disk drive according to claim 1, wherein the power supply control means controls the optical disc to be illuminated when the remaining amount of the recording data stored in the storage means becomes a predetermined value or more based on the detection output of the remaining amount detection means. 8. The disk reproducing apparatus according to claim 7, wherein the power supply to the optical head for irradiating light is further stopped. 12. A first storage means for temporarily storing print data at a first transfer speed, and a first storage means for storing the print data once stored in the first storage means for each predetermined amount at a speed higher than the first transfer speed. A recording unit comprising recording means for intermittently reading and recording data on the optical disc at a transfer rate of 2; and reproducing means for intermittently reproducing record data recorded on the optical disc at predetermined rates by a third transfer rate. A second storage means for temporarily storing the recording data reproduced by the reproducing means at the third transfer speed; and a recording data temporarily stored in the second storage means for storing the recording data once in the second transfer speed. A reproducing unit including a memory control unit that reads data at a slow fourth transfer rate; a remaining amount detecting unit that detects a remaining amount of recording data once stored in the first storage unit; Power supply to the unit Is stopped, and when the remaining amount of the recording data stored in the first storage unit becomes equal to or less than a predetermined value based on the detection output of the remaining amount detection unit, the first storage unit A disk recording / reproducing apparatus comprising: a power supply control unit for stopping supply of power to the recording unit for reading recorded data and recording the data on the optical disk. 13. A remaining amount detecting means for detecting a remaining amount of recording data once stored in said second storing means, and stopping power supply to said recording unit in a reproduction mode, Based on the detection output of the detection means, the second
13. The disk according to claim 12, further comprising a power supply control means for stopping power supply to said reproduction means when the remaining amount of recording data stored in said storage means becomes a predetermined value or more. Recording and playback device.