JP3436257B2 - Data recording method and data recording device, data reproducing method and data 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 recording / reproducing method and recording / reproducing apparatus for compressed data obtained by time-sequentially compressing continuous data, and in particular, it rotates at a speed higher than a disk rotation speed corresponding to the transfer speed of the recording data. The present invention relates to a method and an apparatus for continuously recording data on a driven disk-shaped recording medium, and a method and an apparatus for reproducing data continuously recorded on a disk-shaped recording medium.

[0002]

2. Description of the Related Art Conventionally, in a disc device, for example, a CD player for reproducing a compact disc (CD) having concentric tracks in which digital audio data is recorded as a pit string, the disc is driven by a spindle motor at a constant linear velocity (CLV: The digital audio data is reproduced by irradiating a laser beam along the track on the disc while detecting the change in the intensity of the reflected light depending on the presence or absence of the pit, while being driven to rotate at a constant linear velocity). ing.

Also, with a CD player, when reproducing data
Bit error rate of 10 ^-5When it becomes a degree
There is an error detection code or error correction code.
Error caused by the error correction process
There is no such thing.

By the way, C equipped with an optical reproducing head
In the D player, due to mechanical disturbance such as vibration or shock, the servo system such as the focus servo and tracking servo of the reproducing head may be disconnected, and normal data reproduction may not be performed. In this case, the error cannot be corrected even by using the error detection code or the error correction code described above, and the reproduction is temporarily interrupted.

Unlike a stationary CD player used in a general home, a car CD player or a portable CD player, which is likely to be subjected to a very large vibration or shock, has conventionally been mechanically shaken. The mechanism is provided to prevent the servo system from coming off as described above.

In addition, conventionally, a compact disc (C
D) is a so-called CD-I (CD-Interactiv) that simultaneously records image data, character data, etc. in addition to audio information.
In the method e), for example, seven modes are standardized as audio information as shown in FIG.

In the CD-DA mode whose sound quality level is equivalent to the current 16-bit PCM, the sampling frequency 44.
Linear PCM (Pulse Co) with 1 kHz and 16-bit quantization
de Modulation) is used, and the sampling frequency is 37.8 kHz in the A level stereo mode and the A level monaural mode having the sound quality equivalent to the LP record.
Quantized 8-bit ADPCM (Adaptive Differentia
Pulse Code Modulation) is used, and the sampling frequency is 37.8k in the B level stereo mode and the B level monaural mode having the sound quality equivalent to FM broadcasting.
Hz, ADPCM with a quantization number of 4 bits is used, AM
Sampling frequency 1 in C level stereo mode and C level monaural mode with sound quality equivalent to broadcasting
ADPCM with 8.9 kHz and a quantization number of 4 bits is used.

That is, as shown in FIG.
Compared to the mode, in the A level stereo mode, the bit saving rate is 1/2, so that data is recorded every two so-called sectors (■ indicates a sector in which data is recorded), and one disk is reproduced. It takes about 2 hours, and in the A level monaural mode, the bit saving rate is 1/4, data is recorded every 4 sectors, and the playback time is about 4 hours.
In the B level stereo mode, the bit saving rate is 1/4, and data is recorded every 4 sectors, and the reproduction time is about 4 hours. In the B level mono mode, the bit saving rate is 1/8. The data is recorded every 8 sectors and the reproduction time is about 8 hours. In the C level stereo mode, the bit reduction rate is 1/8, the data is recorded every 8 sectors, and the reproduction time is about 8 hours.
In the C level monaural mode, the bit saving rate is 1/16, data is recorded every 16 sectors, and the reproduction time is about 16 hours.

[0009]

By the way, conventionally, the rotation speed of the disk in each of the above modes is the same, that is, the data transfer rate at which data can be recorded or the data transfer rate at which data can be reproduced per second is 75 sectors. For example, when recording audio information on a disc in the B level stereo mode, this B
Data transfer rate in level stereo mode is 18.75
(75 ÷ 4) sectors / second, and the audio information is discretely recorded every four sectors in the sector direction from the first sector of the innermost track to the outermost track.
After audio information is recorded on the outermost track,
Again, audio information is recorded in the outermost track direction every four sectors from the second sector of the innermost track. That is, the audio information is the innermost circumference → the outermost circumference,
It is recorded on the disc in the form of innermost circumference → outermost circumference, innermost circumference → outermost circumference, innermost circumference → outermost circumference. Therefore, during reproduction, there is a problem in that, while the reproducing head jumps (returns) from the outermost track to the innermost track, data is not reproduced and the reproduced music is interrupted.

Further, conventionally, the above-mentioned C has been used for a write-once type optical disk and a rewritable magneto-optical disk for information.
Although a disk recording device for recording digital data conforming to the D or CD-I standard is also provided, this disk recording device also has focus servo and tracking of the recording head due to mechanical disturbance such as vibration and shock. The servo system such as the servo may come off and recording may be temporarily interrupted.

Therefore, in the present invention, in view of the actual situation in such a conventional disk device, for example, the disk rotation speed is the same in each mode, and the disk rotation speed is the data transfer like the data recording in the B level stereo mode. When the speed is higher than the rotation speed corresponding to the speed, the data can be continuously recorded on the track of the disk rotated at a higher rotation speed than the disk rotation speed corresponding to the data transfer rate. An object of the present invention is to provide a data recording method and a data recording device that enable continuous data reproduction. Another object of the present invention is to provide a data recording method and a data recording device capable of continuously recording data on recording tracks on a disk-shaped recording medium regardless of disturbance of the servo system due to disturbance.

The present invention is also capable of reproducing data continuously recorded on a track of a disk rotated at a rotational speed higher than the disk rotational speed corresponding to the data transfer speed at a predetermined data transfer speed. A method and a data reproducing device are provided.

It is another object of the present invention to provide a data reproducing method and a data reproducing apparatus capable of continuously reproducing data from a recording track on a disk-shaped recording medium regardless of disturbance of the servo system due to disturbance.

[0014]

According to the present invention, in a data recording method for recording data on a disk-shaped recording medium, continuous data is compressed for each unit data, and the compressed data thus compressed is first transferred to a memory means. Sequential storage at a speed, a predetermined amount of compressed data consisting of a plurality of unit data stored in the memory means are continuously read out, and the recording head performs disk-shaped recording at a second transfer speed higher than the first transfer speed. After recording on the medium and recording the predetermined amount of compressed data on the disc-shaped recording medium, the recording operation is interrupted and the period until the predetermined amount of compressed data is stored in the memory means and read again is obtained. During the period of the difference between the first transfer speed and the second transfer speed, the recording head scans the same track where the recording is interrupted and the data is recorded. Characterized by stopping the operation.

Further, according to the present invention, in a data recording apparatus for recording data on a disk-shaped recording medium, a compression processing means for compressing continuous data for each unit data, and a compression data compressed by the compression processing means are first. Second transfer which is faster than the first transfer speed by the recording head, which sequentially reads out a predetermined amount of compressed data composed of a plurality of unit data stored in the memory means Recording means for recording on the disc-shaped recording medium at a speed, the recording means stops the recording operation after recording the predetermined amount of compressed data on the disc-shaped recording medium, and again records the predetermined amount on the memory means. The recording head stops the recording operation during a period of a difference between the first transfer speed and the second transfer speed until the compressed data is stored and read. Characterized by stopping the recording operation of the data while scanning the same track.

Further, the present invention is a data reproducing method for reproducing data from a disk-shaped recording medium on which compressed compressed data is recorded, wherein the compressed data is reproduced by scanning the disk-shaped recording medium with a reproducing head. The read data is subjected to demodulation processing for error correction on the compressed data, the predetermined amount of demodulated compressed data is stored in the memory means at the first transfer rate, and the compressed data once stored in the memory means. Is read out at a second transfer speed slower than the first transfer speed and then output, and the predetermined amount of compressed data is read from the memory means until the output of the expanded data is finished. , Stopping the read operation of the compressed data from the disk-shaped recording medium and scanning the same track on which the read head has stopped the read operation And controlling the so that.

Furthermore, the present invention is a data reproducing apparatus for reproducing data from a disk-shaped recording medium on which compressed compressed data is recorded, and reproducing means for reading the compressed data recorded on the disk-shaped recording medium. , Demodulation processing means for performing demodulation processing for error correction on the compressed data reproduced by the reproducing means, and a predetermined amount of compressed data demodulated by the demodulation processing means are stored at a first transfer rate. And a decompression processing means for performing decompression processing by reading the compressed data once stored in the memory means at a second transfer speed slower than the first transfer speed.
During the period from the reading of the predetermined amount of compressed data from the memory means to the completion of outputting the expanded data by the expansion processing means, the operation of reading the compressed data from the disk-shaped recording medium is stopped and the reproducing head is also used. Is controlled to scan the same track in which the read operation is stopped.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a block circuit diagram showing the configuration of an optical disk device for carrying out the method of the present invention.

First, a data recording method according to the present invention will be described using the data recording system of this optical disk device.

In FIG. 2, a disk 1 is a data rewritable optical disk such as a magneto-optical disk,
The disc 1 is driven by a spindle motor 2 to, for example, a CD-DA in the above-mentioned CD-I data format.
It is rotationally driven at an angular velocity corresponding to the mode data transfer rate of 75 sectors / sec.

The terminal 10 is supplied with ADPCM-converted audio information (hereinafter referred to as recording data) in the B-level stereo mode in the above-mentioned CD-I data format, for example. That is, record data having a data transfer rate of 18.75 (75/4) sectors / second is input.

Buffer circuit 1 connected to the terminal 10
Reference numeral 1 is a memory for storing data for one track, for example. Track 1 stores the recording data for one track at a speed of 18.75 sectors / second and then stores the data at a speed of 75 sectors / second. ECC encoder 1 for data for one cycle
2 burst output.

The ECC encoder 12 is, for example, a so-called ECC (Error Correcting Code) encoder, which adds an error detection code such as a parity bit for error correction during data reproduction, an error correction code, etc. The generated data is output to the modulation circuit 13.

The modulation circuit 13 is, for example, a so-called 4/15.
(4 out of 15) modulator, which outputs the modulated signal to the recording head 14.

The recording head 14 is, for example, an optical head for a magneto-optical disk, and irradiates the recording surface of the disk with a laser beam, and uses the signal from the modulation circuit 13 to determine the direction of the magnetic field applied to the recording surface. To modulate. That is, the recording data is recorded along the track by so-called magneto-optical recording.

In the data recording system having such a configuration, since the disk 1 is rotationally driven at the angular velocity corresponding to four times the data transfer rate of the recording data as described above, the disk 1 is rotated once during one rotation. Further, the recording data for one track of the track stored in the buffer circuit 11 is continuously recorded on the disk 1, and the recording head 14 does not perform the recording operation while the disk 1 makes the remaining three revolutions ( Try to scan the same track (while idle). That is, as shown in FIG. 3, the data is recorded every four sectors in the conventional data format, but the data is continuously recorded so that there is no sector in which the data is not recorded. As a result, it becomes possible to continuously record the recording data on the track of the disc 1.

By the way, for example, when the audio information in the above-mentioned B level monaural mode is supplied through the terminal 10, the data transfer rate of the recording data inputted through this terminal 10 is 9.375 (75). ÷ 8) Sectors / second, and the data is stored by causing the recording head 14 to scan the same track seven times in the idling state. Also, for example, in the case of C level stereo mode,
When the recording head 14 is idling on the same track,
Data is stored as if scanning once. In other modes as well, data recording is performed by changing the number of times the recording head 14 scans the same track in the idling state according to the data transfer rate. That is, data having different data transfer rates can be continuously recorded using the same disk rotation speed.

As described above, the disk 1 is rotationally driven at a rotational speed higher than the disk rotational speed corresponding to the data transfer speed of the recording data input through the terminal 10, and the recording head 14 records the data. By allowing the recording head 14 to scan the same track during a period other than the above, the data can be continuously recorded on the track of the disk 1, and the data is reproduced by the reproducing head as described above. Further, it is possible to prevent jumping from the outermost track to the innermost track, and for example, it is possible to reproduce continuous music.

Next, a data reproducing method according to the present invention will be described by utilizing the data reproducing system of this optical disk device.

In this data reproducing system, for example, the disk 1 on which the audio information (recording data) in the B level stereo mode is continuously recorded as described above is the same as that at the time of data recording by the spindle motor 2. In the CD-I CD-DA mode described above, the CD-I is rotationally driven at an angular velocity equivalent to 75 sectors / sec.

The reproducing head 21 is composed of, for example, optical parts such as a laser diode, a collimator lens, an objective lens, a beam splitter, a cylindrical lens, a photodetector divided into a predetermined arrangement, and a matrix-structured RF.
It is composed of an amplifier, etc.
Irradiating the track of, and reproducing the reproduction signal of the data by utilizing the magneto-optical effect such as the so-called Kerr effect, detects the focus error signal by the so-called astigmatism
For example, the tracking error signal is detected by the so-called push-pull method. These focus error signal and tracking error signal are sent to the reproducing head 2 described above.
1, a focus servo control for maintaining a constant distance between the objective lens 1 and the recording surface of the disk 1, and a reproducing head 2
The laser beam from No. 1 is used for tracking servo control so that the track is accurately scanned.

The sync detecting circuit 22 connected to the reproducing head 21 binarizes the reproduced signal from the reproducing head 21, reproduces the clock signal recorded on the disk 1, and binarizes the clock signal and the binary signal. The sync signal is detected by using the signal thus obtained to pull in the sync, and the data before demodulation is reproduced and output to the demodulation circuit 23.

The demodulation circuit 23 is the synchronization detection circuit 2
The data from 2 is demodulated, for example, on 4/15, and the demodulated data is output to the ECC decoder 24.

The ECC decoder 24 is, for example, an ECC.
(Error Correcting Code) Decoder, which performs error correction of the demodulated data from the demodulation circuit 23 to form reproduced data and corrects the error at a data transfer rate of 18.75 sectors / second via the terminal 20. The reproduced data that has been subjected to the output is output.

In the data reproducing system having such a structure, since the disk 1 is rotationally driven at the angular velocity corresponding to four times the data transfer rate of the reproduced data as described above, the reproducing head 21 drives the same track. Scanning is performed four times, and data for one track is reproduced four times. From the data reproduced from the same track four times, the reproduced data for one time is output through the terminal 20 at a predetermined data transfer rate of 18.75 sectors / second.

By the way, for example, when the audio information in the B level monaural mode described above is continuously recorded on the disc 1, the disc 1 is rotationally driven at an angular velocity corresponding to 8 times the data transfer rate of the reproduction data. Therefore, the reproducing head 21 scans the same track eight times, and reproduces data for one round of the track eight times.
The reproduced data for one time is reproduced from the data reproduced for eight times on the same track at a predetermined data transfer rate of 9.375 (75 ÷
8) Output via terminal 20 in sectors / second. Also in the C level stereo mode, for example, the reproduction head 21 scans the same track eight times and outputs one reproduction data at a predetermined data transfer rate of 9.375 sectors / second via the terminal 20. To do. In other modes as well, the number of times the reproducing head 21 repeatedly scans the same track is changed in accordance with the data transfer rate so that one reproduction data is output at a predetermined data transfer rate. That is, the same disk rotation speed can be used to perform data reproduction with different data transfer rates.

As described above, the disk 1 is rotationally driven at a rotation speed higher than the disk rotation speed corresponding to the data transfer speed of the reproduction data output via the terminal 20, and the reproduction head 21 is the same as the disk. Data is reproduced at a predetermined data transfer rate by scanning the track a plurality of times, reproducing the data for one round of the track a plurality of times, and outputting the reproduced data for one time from the reproduced data at a predetermined data transfer rate. , For example, music can be played continuously.

The present invention is not limited to the above-mentioned embodiment, and is, for example, a so-called write-once type optical disc device,
Of course, it can be applied to a reproducing system of a magnetic disk device, a so-called read-only type CD device or a CD-ROM device, or the like. Further, the present invention can be applied to a disk device that drives a disk to rotate at a constant linear velocity.

As described above, in the optical disk device shown in FIG. 2, the disk is rotationally driven at a rotation speed higher than the disk rotation speed corresponding to the data transfer speed of the recording data, and the recording head moves to the track of the disk. When the data is not being recorded, the recording head can scan the same track so that the recording data can be recorded continuously on the track. For example, continuous music can be reproduced without the head jumping from the outermost track to the innermost track.

Further, when the data recorded continuously as described above is reproduced, the disk is rotationally driven at a rotation speed higher than the disk rotation speed corresponding to the data transfer speed of the reproduction data, and the reproduction head is reproduced. Scans the same track of the disk multiple times, reproduces the data for multiple times, and outputs the data for one time from the reproduced data at a predetermined data transfer rate, thereby obtaining the data at the predetermined data transfer rate. It is possible to reproduce, and for example, music can be continuously reproduced without the reproducing head jumping from the outermost track to the innermost track as in the conventional case.

Next, another embodiment of the method of the present invention carried out by using the disk recording / reproducing apparatus having the structure shown in the block circuit diagram of FIG. 4 will be described in detail.

As shown in FIG. 4, this disk recording / reproducing apparatus is provided with a magneto-optical disk 32 rotatably driven by a spindle motor 31 as a recording medium, and the magneto-optical disk 32 is irradiated with laser light by an optical head 33. In this state, by applying a modulation magnetic field according to the recording data by the magnetic head 34, the data is recorded along the recording track of the magneto-optical disk 32, and the recording track of the magneto-optical disk 32 is recorded by the optical head. Three
Data is reproduced by tracing with laser light in accordance with No. 3.

The optical head 33 is composed of, for example, a laser light source such as a laser diode, optical components such as a collimator lens, an objective lens, a polarizing beam splitter, a cylindrical lens, and a photodetector divided into a predetermined arrangement. The magnetic disk 32 is provided at a position facing the magnetic head 34. When recording data on the magneto-optical disk 32, the optical head 33 drives the magnetic head 34 by a head drive circuit 46 of a recording system, which will be described later, and applies a modulation magnetic field according to the recording data. Data recording is performed by thermomagnetic recording by irradiating a target track of the magnetic disk 32. In addition, this optical head 33
Detects the reflected light of the laser light applied to the target track to detect a focus error by, for example, a so-called astigmatism method, and also detects a tracking error by, for example, a so-called push-pull method, and from the magneto-optical disk 32. When reproducing the data, the reproduction signal is generated by detecting the difference in the polarization angle (Kerr rotation angle) of the reflected light of the laser light from the target track.

The output of the optical head 33 is the RF circuit 3
5 is supplied. The RF circuit 35 extracts the focus error signal and the tracking error signal from the output of the optical head 33 and supplies them to the servo control circuit 36, and also binarizes the reproduction signal to supply it to a reproduction system decoder 51 described later. .

The servo control circuit 36 is composed of, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, and a thread servo control circuit. The focus servo control circuit controls the focus of the optical system of the optical head 33 so that the focus error signal becomes zero. Further, the tracking servo control circuit controls the tracking of the optical system of the optical head 33 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit causes the magneto-optical disk 3 to rotate at a rotation speed corresponding to a predetermined transfer speed (75 sectors / second) corresponding to the CD-DA mode in the CD-I system.
The spindle motor 31 is controlled so that the spindle motor 2 is driven to rotate. Further, the sled servo control circuit moves the optical head 33 and the magnetic head 34 to the target track position of the magneto-optical disk 32 designated by the system controller 37. The servo control circuit 36 that performs such various control operations is the servo control circuit 36.
The system controller 37 is supplied with information indicating the operating state of each unit controlled by the above.

Further, the system controller 37 is
The key input operation unit 38 and the display unit 39 are connected. The system controller 37 includes the key input operation unit 3 described above.
The recording system and the reproducing system are controlled in the operation mode designated by the operation input information of 8. Further, the system controller 37 is traced by the optical head 33 and the magnetic head 34 based on the address information in sector units reproduced from the recording track of the magneto-optical disk 32 by the header time, sub Q data and the like. While managing the recording position and playback position on the recording track,
The time data corresponding to the recording position and the reproducing position is supplied to the display unit 39, and the display unit 39 is controlled to display the recording time and the reproducing time.

The recording system of this disc recording / reproducing apparatus is provided with an A / D converter 42 to which an analog audio signal A _IN is supplied from an input terminal 40 via a low pass filter 41.

The A / D converter 42 quantizes the audio signal A _IN to obtain digital audio data of a predetermined transfer rate (75 sectors / second) corresponding to the CD-DA mode in the CD-I system. Form. The digital audio data obtained by the A / D converter 42 is supplied to the ADPCM encoder 43.

The ADPCM encoder 43 compresses the digital audio data of a predetermined transfer rate obtained by quantizing the audio signal A _IN by the A / D converter 12 in accordance with various modes in the CD-I system. The operation mode is designated by the system controller 37.

In this embodiment, for example, the digital audio data in the CD-DA mode is compressed to 1/4 by the ADPCM encoder 43 so that the transfer rate is 18.75 (75/4) sectors / sec. It shall be converted into stereo mode ADPCM audio data. This ADPCM encoder 43 to 18.
The BPCM stereo mode ADPCM audio data that is continuously output at a transfer rate of 75 sectors / second is
It is supplied to the memory 44.

In the memory 44, the writing and reading of data are controlled by the system controller 37, and the B level stereo mode ADPCM audio data supplied from the ADPCM encoder 43 has a transfer rate of 18.75 sectors / sec. Is written continuously.

Then, the ADPCM audio data in the B level stereo mode continuously written in the memory 44 at a transfer rate of 18.75 sectors / second is used as the recording data in the first recording mode. 44
From the above at a transfer rate of 75 sectors / second in a burst, and in the case of the second recording mode, the above 1
The data is sequentially read at a transfer rate of 8.75 sectors / second.

Here, the system controller 37
In the first recording mode, by incrementing the write pointer of the memory 44 at a transfer rate of 18.75 sectors / second, ADPCM audio data is transferred to the memory 44 at a transfer rate of 18.75 sectors / second. And the data amount of the ADPCM audio data stored in the memory 44 is a predetermined amount K.
When the above is reached, the read pointer of the memory 44 is set to 75
The memory control is performed such that the ADPCM audio data is incremented at a transfer rate of sector / second and the ADPCM audio data is read from the memory 44 as recording data by a predetermined amount K in a burst at the transfer rate of 75 sector / second. In the second recording mode, the system controller 37 sets the write pointer of the memory 44 to 18.
By incrementing at a transfer rate of 75 sectors / second, ADPCM audio data is continuously written to the memory 44 at a transfer rate of 18.75 sectors / second,
When the data amount of the ADPCM audio data stored in the memory 44 becomes a predetermined amount K or more, the read pointer of the memory 44 is incremented at a transfer rate of 18.75 sectors / sec and the memory 44 stores the data in the memory 44. Memory control is performed so that the ADPCM audio data is continuously read at the transfer rate of 18.75 sectors / second as recording data. Further, the system controller 37 causes the ID generator 47 to generate the identification information ID indicating the recording mode of the ADPCM audio data.

Then, the ADPCM audio data read out from the memory 44, that is, the recording data is supplied to the encoder 45 together with the identification information ID indicating the recording mode.

The encoder 45 subjects the recording data supplied from the memory 44 to encoding processing for error correction and EFM encoding processing. This encoder 45
The recording data that has been subjected to the encoding process according to (4) is supplied to the magnetic head drive circuit 46.

The magnetic head drive circuit 46 is connected to the magnetic head 34, and drives the magnetic head 34 so as to apply a modulating magnetic field corresponding to the recording data to the magneto-optical disk 32.

Further, the system controller 37 is
The memory 44 is controlled as described above and the recording position is controlled so that the recording data read from the memory 44 is continuously recorded on the recording track of the magneto-optical disk 32.

In the first recording mode, the control of the recording position controls the recording position of the recording data which is burst-read from the memory 44 by the system controller 37 to record on the magneto-optical disk 32. This is performed by supplying a control signal designating a recording position on a track to the servo control circuit 46. The same track is scanned four times, the recording data is recorded one time, and the other three scanning periods. Then, the recording operation is stopped so that when the next recording data is recorded, it is moved to the next track position, that is, the recording start position. As a result, in the first recording mode, as shown in FIG.
The ADPCM audio data read from No. 4, that is, the recording data is continuously recorded. In the first recording mode, it is possible to perform a reproducing operation for reproducing the data recorded immediately before the recording operation is stopped during the three scanning periods in which the recording operation is stopped. . As a result, it becomes possible to record data while performing the recording confirmation process, that is, the verification process.
In the second recording mode, as shown in FIG. 6, the ADPCM audio data, that is, the recording data, which is sequentially read by the system controller 37 from the memory 44 at the transfer rate of 18.75 sectors / sec, is recorded as it is. . In the second recording mode, four channels of ADPCM audio data can be multiplexed and recorded for four channels.

Here, the identification information ID indicating the recording mode of the ADPCM audio data is recorded in the catalog area of the magneto-optical disk 32 as the catalog information together with the area designation information indicating the recording area.

In the recording system of this disc recording / reproducing apparatus, in the case of the first recording mode, the ADP is controlled by the memory control by the system controller 37.
ADPCM audio data continuously output from the CM encoder 43 at a transfer rate of 18.75 sectors / second is used to store ADPCM audio data at the transfer rate of 18.75 sectors / second in the memory 44.
The above-mentioned A stored in this memory 44
When the data amount of the DPCM audio data exceeds a predetermined amount K, the ADPCM audio data is read from the memory 44 as recording data by a predetermined amount K in a burst manner at a transfer rate of 75 sectors / sec. It is possible to continuously write the input data in the memory 44 while always securing a data writing area of a predetermined amount or more therein. The recording data read out in bursts from the memory 44 is continuous on the recording track of the magneto-optical disk 32 by controlling the recording position on the recording track of the magneto-optical disk 32 by the system controller 37. Can be recorded in the state. Moreover, as described above, the memory 4
Since a data writing area of a predetermined amount or more is always secured in No. 4, when the system controller 37 detects that a track jump or the like has occurred due to disturbance or the like and the recording operation on the magneto-optical disk 32 is interrupted, Also, the input data can be continuously written in the data write area of the predetermined amount or more, and the recovery processing operation can be performed during that time, and the input data can be continuously recorded on the recording track of the magneto-optical disk 32. You can

Next, a reproducing system in this disc recording / reproducing apparatus will be described.

This reproducing system uses the recording system as described above.
The area AR ₁ in which the DPCM audio data is recorded in the first recording mode and the area AR ₂ in which the DPCM audio data is recorded in the second recording mode are mixed, and the ADPCM audio data in each area, that is, the recording data is recorded. The identification information ID indicating the mode is used to reproduce data from the magneto-optical disk 32 recorded in the catalog area as catalog information.

In this embodiment, as shown in FIG.
Area AR₁ADPCM audio data [A₁, A
_Two, A_Three・ ・ ・ ・ ・ ・ A_n] In the first recording mode above
It is recorded continuously, and the area AR_TwoHas A
DPCM audio data [B₁, B_Two, B_Three・ ・ ・
., B_m], ADPCM audio data [C₁，
C_Two, C_Three・ ・ ・ ・ ・ ・ C_m], ADPCM audio device
Data [D₁, D_Two, D_Three・ ・ ・ ・ ・ ・ D_m] And ADPC
M audio data [E₁, E_Two, E_Three・ ・ ・ ・ ・ ・
E _m] Are multiplexed and recorded in the second recording mode described above.
Be present.

In this reproducing system, a reproducing output obtained by tracing a recording track of the magneto-optical disk 32 with a laser beam by the optical head 33 is binarized by the RF circuit 35 and supplied to a decoder 51. Prepare

The decoder 51 corresponds to the encoder 45 in the recording system, and is the R
The reproduction output binarized by the F circuit 35 is subjected to processing such as decoding processing for error correction and EFM decoding processing, and the ADPCM of the above-mentioned B level stereo mode is performed.
Play audio data. The reproduction data obtained by the decoder 51 is supplied to the memory 52 and the ID detector 59.

The ID detector 59 detects the identification information ID indicating the recording mode of the recording data from the reproduction data reproduced from the catalog area of the magneto-optical disk 32 and supplies it to the system controller 37.

The system controller 37 has the I
Based on the identification information ID detected by the D detector 59, whether the reproduction data obtained by the decoder 51 is reproduction data from the area AR ₁ recorded in the first recording mode or the second reproduction data It is discriminated whether or not it is the reproduction data from the area AR ₂ recorded in the recording mode, and the reproduction operation control according to the discrimination result is performed.

That is, the reproduction data [A ₁ , A ₂ , A ₃ , from the area AR ₁ recorded in the above-mentioned first recording mode]
..., A _n ], the memory 52 writes and reads data in the system controller 3
7 decoders and 75 sectors /
The reproduced data supplied at the transfer rate of sec is written in bursts at the transfer rate of 75 sectors / sec. And
As shown in FIG. 7, the reproduction data written in a burst at the transfer rate of 75 sectors / second is the memory 5
2 to B level stereo mode with a regular transfer rate of 18.75 sectors / sec.
It is supplied to the M decoder 53.

In addition, recording was performed in the second recording mode described above.
Area AR_TwoPlayback data [B₁，
C₁, D₁, E₁, B_Two, C_Two, D_Two, E_Two・ ・ ・ ・ ・ ・
B_m, C _m, D_m, E_m] For the decoder 5
Channel with a transfer rate of 18.75 sectors / sec by 1
Another playback data [B₁, B_Two, B_Three・ ・ ・ ・ ・ ・ B_m],
Playback data [C₁, C_Two, C_Three・ ・ ・ ・ ・ ・ C_m〕,Playback
Data [D₁, D_Two, D_Three・ ・ ・ ・ ・ ・ D_m] Or playback
Data [E₁, E_Two, E_Three・ ・ ・ ・ ・ ・ E_m], And that
Playback data for one channel, for example, playback data [B₁，
B_Two, B_Three・ ・ ・ ・ ・ ・ B_m] Via the memory 52
At the transfer rate of 18.75 sectors / second, the above A
It is supplied to the DPCM decoder 53.

Here, the above system controller 37
For the reproduction data from the area AR ₁ recorded in the first recording mode, the write pointer of the memory 52 is incremented at a transfer rate of 75 sectors / second to reproduce the reproduction data from the memory 52. , And the read pointer of the memory 52 is incremented at a transfer rate of 18.75 sectors / sec to transfer the reproduction data from the memory 52 at the rate of 18.75 sectors / sec. The reading is continuously performed at a speed, the writing is stopped when the write pointer catches up with the read pointer, and the writing is performed when the data amount of the reproduction data stored in the memory 52 becomes a predetermined amount L or less. Memory control is performed by incrementing the write pointer of the memory 52 at a transfer rate of 75 sectors / second. In addition, the system controller 37
For reproduction data from the area AR ₂ recorded in the second recording mode, the write pointer of the memory 52 is incremented at a transfer rate of 18.75 sectors / second to generate ADPCM audio data. The data A is continuously written in the memory 52 at a transfer rate of 18.75 sectors / second and stored in the memory 52.
When the amount of DPCM audio data reaches a predetermined amount, the read pointer of the memory 52 is set to 18.7.
Memory control is performed by incrementing at a transfer rate of 5 sectors / sec and continuously reading the ADPCM audio data from the memory 52 as reproduction data at a transfer rate of 18.75 sectors / sec.

Further, the system controller 37 is
The memory control as described above is performed on the memory 52, and the reproduction position is controlled so that the reproduction data written in a burst from the memory 52 is continuously reproduced from the recording track of the magneto-optical disk 32 by the memory control. I do.

For the control of the reproduction position, for the reproduction data from the area AR ₁ recorded in the first recording mode, a control signal for designating the reproduction position on the recording track of the magneto-optical disk 32 is set. By supplying to the servo control circuit 36, the same track is scanned four times, data is read at one time, and the data read operation is stopped during the other three scanning periods, and the next track is read. At the time of reading and reproducing the data, it is moved to the next track position, that is, the reading start position. This allows
Data can be continuously read from the recording track of the area AR ₁ recorded in the first recording mode on the magneto-optical disk 32. The reproduced data from the area AR ₂ recorded in the second recording mode is sequentially read from the recording track of the magneto-optical disk 32 at the transfer rate of 18.75 sectors / second.

Then, the ADPCM in the B level stereo mode obtained as the reproduction data continuously read from the memory 52 at the transfer rate of 18.75 sectors / second.
The audio data is supplied to the ADPCM decoder 53.

The ADPCM decoder 53 corresponds to the ADPCM decoder 13 of the recording system, and the operation mode is designated by the system controller 37. In this embodiment, the ADP of the B level stereo mode is used.
The CM audio data is expanded four times to reproduce the digital audio data. The ADPCM decoder 53 supplies the digital audio data to the D / A converter 54.

The D / A converter 54 uses the ADPCM.
The digital audio data supplied from the decoder 53 is converted into an analog signal to obtain an analog audio signal A.
Form _OUT . The D / analog audio signal obtained by the A converter 54 _{A O UT} is output from the output terminal 56 via a low-pass filter 55.

The reproducing system of the disc recording / reproducing apparatus of this embodiment also has a digital output function, and the ADPCM decoder 53 digitally outputs digital audio data as a digital audio signal D _OUT through the digital output encoder 57. Terminal 5
It is designed to be output from 8.

In the reproducing system of this disc recording / reproducing apparatus, the B level stereo mode ADPCM reproduced from the recording track of the magneto-optical disc 32 by the memory control by the system controller 37.
The audio data is written to the memory 52 in bursts at a transfer rate of 75 sectors / second, and the ADPCM audio data is read from the memory 52 as reproduction data.
Since the data is continuously read at a transfer rate of 8.75 sectors / second, the read data can be continuously read from the memory 52 while always ensuring a data read area of a predetermined amount L or more in the memory 52. You can The reproduction data read out in bursts from the memory 52 is in a state of being continuous from the recording track of the magneto-optical disk 32 by controlling the reproduction position on the recording track of the magneto-optical disk 32 by the system controller 37. Can be played at. Moreover, as described above, since the memory 52 always has a data reading area of a predetermined amount L or more, the system controller 37 detects that a track jump or the like has occurred due to disturbance or the like, and the magneto-optical disk. Even when the reproduction operation for 32 is interrupted, the reproduction data can be read from the data read area of the predetermined amount L or more to continue the output of the analog audio signal, and the restoration processing operation can be performed during that time.

Here, in this disc recording / reproducing apparatus,
Although the recording / reproducing of the ADPCM audio data of the B level stereo mode has been described, the ADPCM audio data of the other mode in the other CD-I system can be recorded / reproduced in the same manner. By recording the compression rate information of the ADPCM audio data in the inventory area, it is possible to record / reproduce the ADPCM audio data in each mode.

The identification information ID may be added to the recording data and recorded, for example, instead of being recorded in the catalog area as the catalog information.

[0081]

As described above, according to the present invention, continuous data is compressed for each unit data, the compressed data thus compressed is sequentially stored in the memory means at the first transfer rate, and stored in the memory means. A predetermined amount of compressed data composed of the plurality of unit data is continuously read and recorded on the recording medium by the recording head at a second transfer speed higher than the first transfer speed, and the predetermined amount of compressed data is recorded. The recording head is recorded for a period of a difference between the first transfer rate and the second transfer rate, which corresponds to a period until the predetermined amount of compressed data is stored and read again in the memory means after recording on the recording medium. Scans the same track and stops the data recording operation, so that the data is continuously recorded on the recording tracks on the disk-shaped recording medium regardless of the disturbance of the servo system due to disturbance. It is possible to record, and it is possible to reduce the power consumption while waiting for the recording operation, and because the high output laser power is not emitted while scanning the same track, there is a risk of accidentally erasing recorded data. Sexuality can also be avoided.

Further, according to the present invention, there is provided a data reproducing method for reproducing data from a recording medium on which compressed compressed data is recorded, wherein the compressed data is read by scanning the recording medium with a reproducing head, A demodulation process for error correction is performed on the compressed data, a predetermined amount of the demodulated compressed data is stored in a memory unit at a first transfer rate, and the compressed data once stored in the memory unit is stored in the memory unit. The period after the read / expansion process is performed at the second transfer speed slower than the first transfer speed, the data is output, and the predetermined amount of compressed data is read from the memory means until the output of the expanded data is completed, By stopping the operation of reading the compressed data from the recording medium, the disk is rotated at a rotation speed higher than the disk rotation speed corresponding to the data transfer speed. It is possible to reproduce data continuously recorded on the track of click at a predetermined data rate.

[Brief description of drawings]

FIG. 1 is a diagram showing a data structure of CD-I.

FIG. 2 is a block circuit diagram showing a configuration of an optical disc device for carrying out the method of the present invention.

3 is a diagram showing an example of a configuration of data recorded on a disc by the optical disc device shown in FIG.

FIG. 4 is a block circuit diagram showing the configuration of a disc recording / reproducing apparatus for carrying out the method of the present invention.

5 is a diagram for explaining the operation of a first recording mode in which data is recorded on a disc by the recording system of the disc recording / reproducing apparatus shown in FIG.

6 is a diagram for explaining the operation of a second recording mode in which data is recorded on the disc by the recording system of the disc recording / reproducing apparatus shown in FIG.

FIG. 7 is a diagram for explaining an operation of a reproducing system of the disc recording / reproducing apparatus which reproduces data from a disc in which an area recorded in the first recording mode and an area recorded in the second recording mode coexist. .

[Explanation of symbols]

1 disk, 2 spindle motor, 10 terminals, 1
DESCRIPTION OF SYMBOLS 1 buffer circuit, 12 ECC encoder, 13 modulation circuit, 14 recording head, 20 terminal, 21 reproduction head, 22 sync detection circuit, 23 demodulation circuit, 24 E
CC decoder, 31 spindle motor, 32 magneto-optical disk, 33 optical head, 34 magnetic head, 35
RF circuit, 36 servo control circuit, 37 system controller, 38 key input operation section, 39 display section, 40
Input terminal, 41 low-pass filter, 42 A / D converter, 43 ADPCM encoder, 44 memory, 4
5 encoder, 46 magnetic head drive circuit, 51 decoder, 52 memory, 53 ADPCM decoder, 5
4 D / A converter, 55 low-pass filter, 56, 5
8 output terminals, 57 digital output encoders, 59
ID detector

Claims (20)

(57) [Claims] 1. A data recording method for recording data on a disk-shaped recording medium, wherein continuous data is compressed for each unit data, and the compressed data thus compressed is sequentially stored in a memory means at a first transfer rate, A predetermined amount of compressed data composed of a plurality of unit data stored in the means is continuously read and recorded on the disk-shaped recording medium at a second transfer speed higher than the first transfer speed by the recording head, and the predetermined amount is recorded. After recording the compressed data on the disk-shaped recording medium, the recording operation is interrupted, and the first transfer speed corresponding to the period until the predetermined amount of compressed data is stored in the memory means and is read out again. The recording head performs the recording during the second transfer speed difference period.
A data recording method characterized by scanning the same cut track and stopping the data recording operation. 2. The disk-shaped recording medium is used to compress continuous data into 1 / N (N ≧ 2 is a positive integer), and the compressed data is supplied to the recording head through the memory means. At the same time, the disk-shaped recording medium is rotated at a rotation speed approximately N times the rotation speed corresponding to the data transfer speed of the compressed data, and the data is recorded on the disk-shaped recording medium. Data recording method described in. 3. When the data recording operation is performed again after the data recording operation on the disk-shaped recording medium is stopped, the recording head is moved to a new recording start position on the disk-shaped recording medium. Claim 1 characterized by the above-mentioned.
Alternatively, the data recording method according to claim 2. 4. The data recording method according to claim 1, wherein the predetermined amount of compressed data read from the memory means is a data amount recorded in approximately one track. 5. The data recorded on the disk-shaped recording medium is reproduced while the data recording operation on the disk-shaped recording medium is stopped. Data recording method. 6. The data reproduced during the period in which the recording operation of the data on the disk-shaped recording medium is stopped is data continuously recorded immediately before the recording operation is stopped. The data recording method according to claim 5. 7. A data recording apparatus for recording data on a disk-shaped recording medium, wherein a compression processing means for compressing continuous data for each unit data, and compression data compressed by the compression processing means at a first transfer rate. A memory means for sequentially storing, and a predetermined amount of compressed data composed of a plurality of unit data stored in the memory means are continuously read out, and a recording head is used to perform a disc-shaped operation at a second transfer speed higher than the first transfer speed. Recording means for recording on a recording medium, wherein the recording means stops the recording operation after recording the predetermined amount of compressed data on the disc-shaped recording medium, and again records the predetermined amount of compressed data on the memory means. The recording head stops the recording operation during a period of a difference between the first transfer speed and the second transfer speed until the data is stored and read.
A data recording device characterized by scanning the same track and stopping the data recording operation. 8. The compression processing means divides continuous data into 1 /
The compressed data compressed to N (N ≧ 2 is a positive integer) is supplied to the recording head through the memory means, and the recording means has a rotation speed substantially N which corresponds to the data transfer speed of the compressed data. The data recording device according to claim 7, wherein the disk-shaped recording medium is rotated at a double rotation speed to record data on the disk-shaped recording medium. 9. The recording means, when the data recording operation is performed again after the recording operation of the data on the disk-shaped recording medium is stopped, the recording head is placed on the disk-shaped recording medium. 9. The data recording device according to claim 7, wherein the data recording device is moved to a new recording start position. 10. The data recording apparatus according to claim 7, wherein the predetermined amount of compressed data read from the memory means is a data amount recorded in approximately one track. 11. A period in which to stop the recording operation of data to the disc-shaped recording medium, already comprises a reproducing means for reproducing the data recorded on the disc-shaped Symbol <br/> recording medium The data recording device according to claim 9, wherein 12. The data reproduced by the reproducing means while the recording operation of the data on the disk-shaped recording medium is stopped is data continuously recorded immediately before the recording operation is stopped. The data recording device according to claim 11, wherein: 13. A compressed data compressed is recorded de
A data reproducing method for reproducing data from a disc shaped recording medium, reads out the compressed data by scanning the disc-shaped recording medium by the reproducing head, performs demodulation processing for error correction to the compressed data, The demodulated predetermined amount of compressed data is first stored in the memory means.
The compressed data stored at the transfer speed of
Output at a slower than the transfer speed second transfer rate after performing the read decompression process, the period of the compressed data of the predetermined amount until you output the data extending from after reading from said memory means, like the disc Stops the operation of reading compressed data from the recording medium and stops the read operation of the playback head.
A data reproducing method characterized by controlling the same track to be scanned . 14. Compressed data obtained by compressing continuous data into 1 / N (N is a positive integer of 2 or more) is recorded on the disk-shaped recording medium, and the rotational speed corresponding to the data transfer speed of the compressed data is approximately the same. 14. The data reproducing method according to claim 13, wherein the disk-shaped recording medium is rotated at a rotation speed of N times to reproduce data from the disk-shaped recording medium. 15. When the read operation is performed again after the read operation from the disk-shaped recording medium is stopped, the reproducing head is moved to a new reproduction start position on the disk-shaped recording medium. 15. The data reproducing method according to claim 13 or 14. 16. The data reproducing method according to claim 15, wherein the predetermined amount of compressed data read from the disc-shaped recording medium is the amount of data recorded in approximately one track. 17. compressed data compressed is recorded de
A data reproducing apparatus for reproducing data from a disc shaped recording medium, a reproducing means for reading compressed data recorded on the disc-shaped recording medium, for error correction to the compressed data reproduced by said reproducing means Demodulation processing means for performing the demodulation processing of 1., memory means for storing a predetermined amount of compressed data demodulated by the demodulation processing means at a first transfer speed, and compressed data once stored in the memory means First
A decompression processing unit that reads decompression process than a slow second transfer rate transfer rate, finishes the compressed data of the predetermined amount and outputs the data to the decompression processing unit is extended later read out from said memory means time to, the reproducing head stops the reading operation of the compressed data from the disc-shaped recording medium
Scan the same track that stopped the read operation
A data reproducing device characterized by controlling . 18. Compressed data obtained by compressing continuous data into 1 / N (N ≧ 2 is a positive integer) is recorded on the disk-shaped recording medium, and the reproducing means corresponds to a data transfer rate of the compressed data. 18. The data reproducing apparatus according to claim 17, wherein the disk-shaped recording medium is rotated at a rotation speed approximately N times as high as the rotation speed to reproduce data from the disk-shaped recording medium. 19. The reproduction means, after stopping the operation of reading from the disc-shaped recording medium is moved when performing the read operation again, the reproducing head to a new playback start position on the disc-shaped recording medium The data reproducing apparatus according to claim 17 or 18, characterized in that. 20. The predetermined amount of compressed data read from the disc-shaped recording medium by the reproducing means is a data amount recorded in approximately one track. Data playback device.