JPH06139696A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain excellent recording and reproducing operation with little play time by executing in time division the operation writing digital data for recording and reproducing on a recording medium and the operation reading out recorded data. CONSTITUTION:The data with a first transfer rate stored in a buffer memory 24 are converted to the data with a second transfer rate by an EFM and an error correction encoder/decoder 15. Then, the data are supplied to a recording magnetic head 7 through a recording head driving part 8 and recorded on a magneto-optical disk 3. At this time, a recording time length is shorter than the length on the time base of an original information signal being a subject for recording and reproducing. The data obviously recorded on the magneto- optical disk 3 are read out at a second transfer rate during the play time occurring as the time difference, and are converted to a regenerative signal and outputted after restoring to the data with a first transfer rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art As the demand for recording various information signals with high recording density has increased, in recent years, high density recording of information signals has been performed by information recording media made on the basis of various constitutional principles and operating principles. Reproduction is performed, and for example, the information surface is recorded by forming irregularities corresponding to the information signal on the signal surface of the information recording medium, and the recorded information signal is reproduced by an optical means. Have already been put to practical use for recording and reproducing video signals and audio signals, and in order to meet the demand for high-density recording and reproducing in various technical fields, the intensity is modulated by the information signal in the recording layer of the information recording medium. The information signal is recorded by irradiating the recording layer of the information recording medium with a beam to generate a physical change or a chemical change according to the information signal. The information recording medium has been put into practical use, but with the development of a semiconductor laser that operates stably, it is now possible to perform high-density recording and reproduction using laser light. Since various optical recording media can be recorded and reproduced in a non-contact state, they have the advantage of being resistant to scratches and dust, and having a large storage capacity due to high-density recording. It is well known that the current situation is that some research has been carried out or that research and development for practical use is being carried out.

That is, for example, a compact disc is widely used as a pre-recorded optical disc (playback-only optical disc) that is reproduced in large quantities from an original disc on which information signals are recorded by pits formed as geometrical recesses or protrusions. In addition, as a rewritable optical disc,
For example, magneto-optical disks and other optical disks have been put to practical use in office file memories and other applications. The magneto-optical disk described above utilizes the change in magnetic characteristics due to heat in a magnetic material to record information in a recording layer made of a perpendicularly magnetized film by a change in magnetization corresponding to recorded information. The recording medium is a recording medium in which the state of change in magnetization corresponding to the recorded information is read by utilizing an optical effect associated with magnetism such as the Faraday effect or Kerr effect. Overwriting can also be performed by irradiating a portion where the intensity is changed with a spot of a minute light having a constant light intensity that can be heated to a temperature equal to or higher than the Curie temperature of the perpendicular magnetization film. Further, in a magneto-optical disk, for example, a transparent substrate is generally provided with a tracking guide groove and other tracking geometrically changed portions so that tracking control can be performed even during recording. is there.

With the spread of the compact discs described above, a magneto-optical disc device capable of reproducing by using a reproducing mechanism for the compact disc, or a driving mechanism of the compact disc and a part of the circuit are also used. At the same time, a magneto-optical disk device and the like configured by adding a recording device have been proposed, but recently, a signal format specified by the compact disc is smaller than that of the compact disc. Recording and playback such as playback of digital audio signals from a recorded optical disc on which signals are recorded, and recording and playback of digital audio signals by a magneto-optical disc that performs recording and playback of signals of the signal format specified for compact discs. The device was announced. FIG. 3 is a block diagram showing a schematic configuration of the above-mentioned recording / reproducing apparatus. In FIG. 1, 1 is a disk drive motor and 2 is a rotation shaft of the disk drive motor 1. Reference numeral 3 is a recorded optical disk (or magneto-optical disk), 4 is a cartridge accommodating the recorded optical disk (or magneto-optical disk) 3, and 4a is a shutter provided in the cartridge 4. And this shutter 4
When the cartridge 4 is mounted in the recording / reproducing apparatus, a is opened so that the signal surface of the recorded optical disc (or magneto-optical disc) 3 is irradiated with the laser beam, or It is possible to arrange the recording magnetic head 7 close to the recording surface.

When the cartridge 4 is mounted on the recording / reproducing apparatus, the optical disk (or magneto-optical disk) 3 housed in the cartridge 4 is fixed to the rotary shaft 2 of the disk drive motor 1, and the disk drive motor 1 described above is operated. When rotated at a predetermined rotation speed, the optical disk in the cartridge 4
The (or magneto-optical disk) 3 is driven and rotated at a predetermined rotation speed. The optical head 6 is moved by the feeding mechanism 10 in the radial direction of the optical disc (or magneto-optical disc) 3 to displace the laser beam emitted from the objective lens 5 on the optical disc (or magneto-optical disc) 3 in the sub-scanning direction. The servo control circuit 13 controls the rotation number and rotation phase of the disk drive motor 1, the feed amount of the feed mechanism, the displacement amount of the objective lens 5 provided on the optical head for automatic focus control and tracking control, and the like. It is automatically controlled by the operation as is well known.

Reference numeral 21 is an input terminal of an audio signal to be recorded, and when the recording / reproducing apparatus is set in the recording mode, the audio signal supplied to the input terminal 21 is an analog-digital converter 19 Is converted into a digital signal having a predetermined number of bits (16 bits) and then given to the audio compression encoder / decoder 18. In the audio compression encoder / decoder 18, the digital signal supplied thereto is compressed by the audio compression encoder into digital data having an information amount of about ⅕, and the transfer rate is 0.3.
As the digital data of megabits per second (0.3 Mbps), the digital data whose information amount is compressed to ⅕ as described above is transmitted via the vibration-proof memory controller 16.
After the EFM signal with the error correction code added in the EFM and the error correction encoder / decoder 15 is converted into a recording signal having a transfer rate of 1.4 Mbps, recording is performed on the recording magnetic head 7 via the recording head drive unit 8. Supply a signal. The recording magnetic head 7 gives a recording magnetic field whose magnetic field strength is changing corresponding to a recording signal to the magneto-optical disk 3 having a diameter of 64 mm which is rotating at a predetermined rotation number in the cartridge 4. In addition, the optical head 6 rotates in the cartridge 4 at a predetermined rotation speed.
At the position where information is to be recorded, a converging point of the laser light flux emitted from the objective lens 5 is generated. As a result, recording is performed on the magneto-optical disk 3 in accordance with a recording signal having a transfer rate of 1.4 Mbps by the EFM signal.

Next, after the cartridge containing the recorded optical disk (or magneto-optical disk) 3 is installed in the recording / reproducing apparatus, the recording / reproducing apparatus is set in the reproducing mode, and the cartridge 4 is stored. In the recorded optical disk (or magneto-optical disk) 3 having a diameter of 64 mm which is rotated at a predetermined rotation speed, the optical head 6 is a recorded optical disk which is rotated at a predetermined rotation speed in the cartridge 4 ( Alternatively, a converging point of a laser beam for reading having a predetermined weak light intensity emitted from the objective lens 5 is generated at a position where the recorded information on the magneto-optical disk 3 should be reproduced. Thereby, an optical pickup device in which reflected light including a reproduction signal having a transfer rate of 1.4 Mbps by the EFM signal is provided from the recorded optical disc (or magneto-optical disc) 3 to the optical head 6 via the objective lens 5. Given to.

In the optical pickup device provided in the optical head 6 described above, when the recorded disk to be reproduced is the recorded optical disk in which the record information is recorded by the pit arrangement, , A reproduction signal having a transfer rate of 1.4 Mbps by the reproduced EFM signal corresponding to the intensity change of the reflected light from the recorded disk is output, and the recorded disk which is the target of the reproduction is In the case of a magneto-optical disk, a reproduction signal having a transfer rate of 1.4 Mbps by an EFM signal reproduced corresponding to a change in the degree of polarization deviation of the reflected light from the magneto-optical disk is output. The reproduction signal output from the optical pickup device provided in the optical head 6 is amplified by the high frequency amplifier 11, and then supplied to the address decoder 12, the EFM, the error correction encoder decoder 15, the servo control circuit 13, and the like. It The address information decoded by the address decoder 12 is supplied to the EFM and the error correction encoder decoder 15 described above. Further, the servo control circuit 13 controls the feeding mechanism 10, the disk drive motor 1, and the optical head 6 by various control signals generated based on the signals supplied thereto, as is well known.

Under the control of the system controller 14, the above EFM and error correction encoder / decoder 15 have a transfer rate of 1.4 Mbps according to the supplied EFM signal.
After decoding the digital data of (1) and performing error correction on the digital data, it is supplied to the anti-vibration memory controller 16. The vibration-proof memory controller 16 is the system controller 1
Under the control of No. 4, the digital data supplied from the EFM and the error correction encoder / decoder 15 are stored in the buffer memory 1
After being stored in 7, the data is read from the buffer memory 17 as digital data having a transfer rate of 0.3 Mbps,
The audio compression decoder encoder 18 is supplied. The audio compression decoder encoder 18 decodes it by the decoder and gives it to the digital-analog converter 20 as a 16-bit digital signal. The digital-analog converter 20 gives the 16-bit digital signal given to it to the analog signal form. It is converted into an acoustic signal and output to the output terminal 22.

In the recording / reproducing apparatus, the transfer rate of 0.3 Mbps in which the information amount is compressed to 1/5 by the signal processing including the information amount compressing means with respect to the audio signal to be recorded / reproduced. And converting the first digital data into second digital data for recording / reproduction by an EFM signal having a transfer rate of 1.4 Mbps defined by the compact disc standard. Then, the second digital data for recording / reproducing by the EFM signal having the transfer rate of 1.4 Mbps recorded on the recording medium is read out, decoded and subjected to error correction. The data is stored in the buffer memory 17, and is read from the buffer memory 17 as the first digital data having the above-mentioned transfer rate of 0.3 Mbps. After that, it is decoded by a decoder and then digital-analog conversion is performed to obtain an acoustic signal in the form of an analog signal. For example, the optical head 6 cannot read a signal from a recording medium during a reproducing operation due to vibration. Even if the buffer memory 1
The reproduction signal obtained by reading the digital data stored in 7 is obtained without interruption, and the optical head 6 is vibrated before the digital data stored in the buffer memory 17 is read out. Since the second digital data for recording / reproducing of the portion which could not be read can be read again, it is possible to prevent skipping in the reproduced sound even when a large vibration is applied to the recording / reproducing apparatus.

[0011]

In the conventional recording / reproducing apparatus described with reference to FIG. 3, as is apparent from the above description, the read operation in the period of the write operation by the optical head 6 and in the state where there is no vibration. Other than the period of, it is a period of playing at all. Therefore, there has been a demand for improving the function of the recording / reproducing apparatus by effectively utilizing the play period described above.

[0012]

According to the present invention, a minimum amount of information is reduced from 1 / N to 1 / M (where N , M is a number greater than or equal to 2) means for obtaining digital data having a first transfer rate compressed, and the digital data having the first transfer rate is modulated according to a predetermined modulation method. And a unit for converting the recording / reproducing digital data having a second transfer rate N times or more the first transfer rate described above, and recording / reproducing digital data having the second transfer rate described above. A unit for writing the medium, a unit for reading the recording / reproducing digital data recorded on the recording medium at the second transfer rate, and a unit for reading the recording / reproducing digital data read out by the first unit. A recording / reproducing apparatus comprising: a unit for restoring digital data having a transfer rate; and a unit for converting the digital data having the first transfer rate into a reproduction signal and outputting the reproduction signal. The recording / reproducing apparatus is provided with a unit for time-divisionally performing an operation of writing data on a recording medium and an operation of reading digital data for recording / reproducing recorded on the recording medium, and is set as a recording / reproducing apparatus. The input information signal being supplied and the reproduction signal output from the recording / reproducing device based on the recording / reproducing digital data recorded on the recording medium are present as simultaneous signals. There is provided a recording / reproducing apparatus characterized by:

[0013]

The minimum amount of information is 1 by the signal processing including the information amount compression means for the information signal to be recorded and reproduced.
/ N to 1 / M at maximum (where N and M are numbers of 2 or more), the digital data having the first transfer rate compressed is generated, and the digital data having the above-mentioned first transfer rate is generated. Recording that is modulated according to a predetermined modulation method and that is converted into digital data for recording and reproduction having a second transfer rate that is N times or more the first transfer rate described above and then written to a recording medium Operation and reading of the recording / reproducing digital data recorded on the recording medium at the second transfer rate described above, and the read recording / reproducing digital data is restored to digital data having the first transfer rate. A reproducing operation of converting the reproduced signal to a reproduced signal and outputting the reproduced signal, and an information signal for recording on a recording medium,
The time division is performed so that the information signal reproduced from the recording medium becomes a simultaneous signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the recording / reproducing apparatus of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are block diagrams showing a schematic configuration of a recording / reproducing apparatus of the present invention. In FIGS. 1 and 2, a rewritable optical disk is attached to a rotary shaft 2 of a disk drive motor 1 prior to a recording / reproducing operation. When the magneto-optical disk 3 in the cartridge 4 accommodating (for example, the magneto-optical disk) 3 is fixed, the shutter 4a is opened when the cartridge 4 is mounted in the recording / reproducing apparatus, and the magneto-optical disk is opened. The signal surface of 3 is irradiated with a laser beam, or the recording magnetic head 7 is arranged close to the recording surface of the magneto-optical disk 3. When the cartridge 4 is mounted on the recording / reproducing apparatus and the magneto-optical disk 3 housed in the cartridge 4 is fixed to the rotation shaft 2 of the disk drive motor 1, the disk drive motor 1 rotates at a predetermined rotation speed. The magneto-optical disk 3 in the cartridge 4 is driven and rotated at a predetermined rotation speed. Further, the optical head 6 is the feeding mechanism 1
The laser beam emitted from the objective lens 5 is displaced in the sub-scanning direction on the magneto-optical disk 3 by moving the magneto-optical disk 3 in the radial direction by 0. The servo control circuit 1 controls the number of rotations and the rotation phase of the disk drive motor 1, the feed amount of the feed mechanism, the displacement amount of the objective lens 5 provided on the optical head for automatic focus control and tracking control, and the like.
As is well known, automatic control is performed by the control operation of 3.

In the recording / reproducing apparatus shown in FIGS. 1 and 2, the audio signal supplied to the input terminal 21 is converted into a digital signal having a predetermined number of bits (16 bits) by the analog-digital converter 19 and then converted into a voice signal. It is given to the compression encoder 27. Audio compression encoder 2 described above
In No. 7, the digital signal supplied thereto is compressed into a digital data having a first transfer rate in which the amount of information is compressed within a range from a minimum 1 / N to a maximum 1 / M (where N and M are numbers of 2 or more). To do. In the following description, in order to simplify the description, the compression rate of the information amount in the audio compression encoder 27 described above is a constant compression rate {for example, 1/5 (M = N =
5)}, and the first transfer rate is digital data of 0.3 megabits per second (0.3 Mbps). In implementing the present invention, an adaptive audio compression encoder is used. Then, the digital signal supplied thereto can be compressed in the range of the minimum amount of information 1 / N to the maximum amount of 1 / M (where N and M are numbers of 2 or more). When the adaptive voice compression encoder is used, the information amount is expanded by the adaptive decoder.

In the recording / reproducing apparatus shown in FIG. 1, the digital data having the first transfer rate output from the audio compression encoder 27 is stored in the memory controller 2.
2 is stored in the buffer memory 24 via the memory controller 29, and the digital data having the first transfer rate output from the audio compression encoder 27 in the recording / reproducing apparatus shown in FIG. Stored in 30. In the recording / reproducing apparatus shown in FIG. 1, the digital data having the first transfer rate stored in the buffer memory 24 is supplied to the EFM and the error correction encoder / decoder 15 via the memory controller 23, and the EFM and the error correction are performed. EFM with error correction code added in the encoder / decoder 15
The signal is converted into a recording signal having a transfer rate of 1.4 Mbps (digital data for recording and reproduction at the second transfer rate). In the recording / reproducing apparatus shown in FIG.
The digital data having the first transfer rate stored in the buffer memory 30 is supplied to the EFM and the error correction encoder / decoder 15 through the memory controller 29, and the error correction code is added in the EFM and the error correction encoder / decoder 15. The transfer signal by the EFM signal in the state is converted into a recording signal having a transfer rate of 1.4 Mbps (digital data for recording and reproduction at the second transfer rate).

In the recording / reproducing apparatus shown in FIGS. 1 and 2, a recording signal (second signal) having a transfer rate of 1.4 Mbps by the EFM signal with the error correction code added in the EFM and the error correction encoder / decoder 15 is used. (Recording / reproducing digital data at a transfer rate of 1) is supplied to the recording magnetic head 7 via the recording head drive unit 8, and as described above, recording / reproducing at a second transfer rate is performed on the recording magnetic head 7. The optical head 6 applies a laser beam having the laser light intensity at the time of recording operation from the objective lens 5 to the recording target area in the magneto-optical disc 3 housed in the cartridge 4 in the state where the digital data for use is supplied. Since it is controlled, the second transfer record supplied to the recording magnetic head 7 as described above is recorded on the magneto-optical disk 3. The digital data for recording / reproduction by the printer is recorded.

In the recording operation performed on the magneto-optical disk 3 as described above, the minimum information amount is 1 / N by the signal processing including the information amount compression means for the information signal to be recorded and reproduced. Up to 1 / M (1/5 in the example)
The first transfer rate compressed to 0 (0.3 Mbp in the example)
s) is modulated in accordance with a predetermined modulation method, and a second transfer rate higher than the first transfer rate described above (1.4M in the example).
Since recording is performed by writing recording / reproducing digital data having a bps) on a recording medium, a recording having a second transfer rate (1.4 Mbps in the example) higher than the first transfer rate described above. The time length used for recording the digital data for reproduction is shorter than the length on the time axis of the original information signal to be recorded / reproduced. Therefore, in the present invention, as a difference between the length on the time axis of the original information signal to be recorded and reproduced and the time length used for recording the digital data for recording and reproduction having the second transfer rate. During the play time that occurs, the recording / reproducing digital data already recorded in the magneto-optical disk 3 is read at the above-mentioned second transfer rate, and the read recording / reproducing digital data is transferred to the first
An information signal to be recorded on a recording medium by performing a reproduction operation of converting to a reproduction signal and outputting after being restored to digital data having a transfer rate of
In a state where the information signal reproduced from the recording medium becomes a simultaneous signal, the recording operation of the information signal on the magneto-optical disk 3 and the reproducing operation of the information signal from the magneto-optical disk 3 are performed in a time division manner. To do.

That is, the diameter of the cartridge 4 mounted at the recording / reproducing apparatus rotating at a predetermined rotation speed is 64.
The mm-sized magneto-optical disk 3 is irradiated with a laser beam for recording having a high light intensity from the optical head 6 through the objective lens 5, and the recording magnetic head 7 is digitally recorded and reproduced at the second transfer rate. After supplying data and recording digital data for recording / reproduction on the magneto-optical disk 3,
The optical head 6 is controlled by the system controller 14.
However, when a converging point of a laser beam for reading having a predetermined weak light intensity emitted from the objective lens 5 is generated at a position where the recorded information is to be reproduced, this causes the magneto-optical disk 3 to emit light.
Reflected light including a reproduction signal whose transfer rate by the FM signal is 1.4 Mbps is given to the optical pickup device provided in the optical head 6 via the objective lens 5. In the optical pickup device provided in the optical head 6 described above, the reproduction rate of 1.4 Mbps is reproduced by the EFM signal reproduced corresponding to the change in the degree of deviation of the polarization plane of the reflected light from the magneto-optical disk. Output a signal.

The reproduction signal output from the optical pickup device provided in the above-mentioned optical head 6 is amplified by the high frequency amplifier 11, and then is reproduced by the address decoder 1.
2, the EFM, the error correction encoder / decoder 15, the servo control circuit 13, and the like. Address decoder 12
The address information decoded in (1) is supplied to the EFM and the error correction encoder / decoder 15 described above, and the servo control circuit 13 uses the various control signals generated based on the signals supplied to the servo control circuit 13, as is well known. The feeding mechanism 10, the disk drive motor 1, and the optical head 6 are controlled. EFM and error correction encoder decoder 1 described above
Reference numeral 5 is, under the control of the system controller 14, decodes digital data having a transfer rate of 1.4 Mbps by the supplied EFM signal, and after performing error correction on the digital data,
It is supplied to the memory controller 25 in the recording / reproducing apparatus shown in FIG. 1, and to the memory controller 29 in the recording / reproducing apparatus shown in FIG.

The memory controller 25 in the recording / reproducing apparatus shown in FIG.
EFM and error correction encoder / decoder 1 under the control of
The digital data supplied from 5 is stored in the buffer memory 26.
Stored in the buffer memory 26, the data is read out from the buffer memory 26 as digital data having a transfer rate of 0.3 Mbps and is supplied to the audio compression decoder 28. The audio compression decoder 28 decodes the digital data and outputs it as a 16-bit digital signal. The 16-bit digital signal given to the analog-to-analog converter 20 is supplied to the analog-to-analog converter 20 to be converted into an acoustic signal in an analog signal form and output to the output terminal 22.

The memory controller 29 of the recording / reproducing apparatus shown in FIG.
EFM and error correction encoder / decoder 1 under the control of
5, the digital data supplied from the buffer memory 30
Stored in the buffer memory 30, the data is read out from the buffer memory 30 as digital data having a transfer rate of 0.3 Mbps and supplied to the audio compression decoder 28. The audio compression decoder 28 decodes the digital data and outputs it as a 16-bit digital signal. The 16-bit digital signal given to the analog-to-analog converter 20 is supplied to the analog-to-analog converter 20 to be converted into an acoustic signal in an analog signal form and output to the output terminal 22. The recording / reproducing apparatus shown in FIG. 2 uses one memory controller 29 and one buffer memory 30 for the recording operation and the reproducing operation, and the recording / reproducing apparatus shown in FIG. Separate memory controller 2 for playback operation
3 and 25 and buffer memories 24 and 26, respectively, which are different from each other, and the recording / reproducing apparatus having either of the configuration modes of FIG. 1 and FIG. The recording and reproducing operations are performed in a time-division manner such that the information signal for recording on the recording medium and the information signal reproduced from the recording medium are simultaneous signals. Can perform actions. It should be noted that when the compression rate of the information amount is high, one or both of the information signal to be recorded and the reproduced information signal can be a plurality of information signals. Absent.

[0023]

As is apparent from the above detailed description, the recording / reproducing apparatus of the present invention can reduce the information amount by the signal processing including the information amount compression means with respect to the information signal to be recorded / reproduced. Minimum 1 / N to maximum 1 / M (However,
N and M are numbers greater than or equal to 2) and generate digital data having a first transfer rate compressed to a range of the first
The digital data having a transfer rate of 1 is modulated according to a predetermined modulation method, and
Recording operation for converting to digital data for recording / reproduction having a second transfer rate N times or more of the transfer rate for writing to a recording medium, and digital data for recording / reproduction recorded on the recording medium. Is read at the second transfer rate described above, the read digital data for recording and reproduction is restored to digital data having the first transfer rate, and then converted into a reproduction signal for output, and a recording operation is performed. By time-division so that the information signal for recording and the information signal reproduced from the recording medium become simultaneous signals, there is no time to play that has been a problem in conventional devices. The recording / reproducing operation can be favorably performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a recording / reproducing apparatus of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a recording / reproducing apparatus of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a conventional example of a recording / reproducing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive motor, 2 ... Rotation shaft of disk drive motor 1, 3 ... Magneto-optical disk, 4 ... Cartridge accommodating magneto-optical disk 3, 4a ... Shutter provided in cartridge 4, 5 ... Objective lens , 6 ... Optical head, 7 ... Recording magnetic head, 10 ... Feed mechanism, 11 ... High frequency amplifier, 12 ... Address decoder, 13 ... Servo control circuit, 14 ... System controller, 15 ... EFM and error correction encoder decoder, 16 ... Anti-vibration memory controller, 17, 24, 26, 30 ... Buffer memory,
18 ... Audio compression encoder / decoder, 19 ... Analog-digital converter, 20 ... Digital-analog converter, 23,
25, 29 ... Memory controller, 27 ... Compression encoder, 28 ... Compression decoder,

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[Procedure amendment]

[Submission date] June 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

With the spread of the compact discs described above, a magneto-optical disc device capable of reproducing by using a reproducing mechanism for the compact disc, or a driving mechanism of the compact disc and a part of the circuit are also used. At the same time, a magneto-optical disk device and the like configured by adding a recording device have been proposed, but recently, a signal format specified by the compact disc is smaller than that of the compact disc. Recording and playback such as playback of digital audio signals from a recorded optical disc on which signals are recorded, and recording and playback of digital audio signals by a magneto-optical disc that performs recording and playback of signals of the signal format specified for compact discs. The device was announced. FIG. 3 is a block diagram showing a schematic configuration of the recording / reproducing apparatus described above. In FIG. 3, 1 is a disk drive motor, and 2 is a rotation shaft of the disk drive motor 1. Reference numeral 3 is a recorded optical disk (or magneto-optical disk), 4 is a cartridge accommodating the recorded optical disk (or magneto-optical disk) 3, and 4a is a shutter provided in the cartridge 4. And this shutter 4
When the cartridge 4 is mounted in the recording / reproducing apparatus, a is opened so that the signal surface of the recorded optical disc (or magneto-optical disc) 3 is irradiated with the laser beam, or It is possible to arrange the recording magnetic head 7 close to the recording surface.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

Reference numeral 21 is an input terminal of an audio signal to be recorded, and when the recording / reproducing apparatus is set in the recording mode, the audio signal supplied to the input terminal 21 is an analog-digital converter 19 Is converted into a digital signal having a predetermined number of bits (16 bits) and then given to the audio compression encoder / decoder 18. The audio compression encoder / decoder 18 compresses the digital signal supplied thereto into digital data having an information amount of about ⅕ by an audio compression encoder, and the transfer rate is 0.3.
As the digital data of megabits per second (0.3 Mbps), the digital data whose information amount is compressed to ⅕ as described above is transmitted via the vibration-proof memory controller 16.
After the EFM signal with the error correction code added in the EFM and the error correction encoder / decoder 15 is converted into a recording signal having a transfer rate of 1.4 Mbps, recording is performed on the recording magnetic head 7 via the recording head drive unit 8. Supply a signal. The recording magnetic head 7 applies a recording magnetic field whose magnetic field strength changes corresponding to a recording signal to the magneto-optical disk 3 having a diameter of 64 mm which is rotating at a predetermined rotation speed in the cartridge 4. Further, the optical head 6 is rotated in the cartridge 4 at a predetermined rotation speed, and the magneto-optical disk 3 is rotated.
At the position where information is to be recorded, a converging point of the laser light flux emitted from the objective lens 5 is generated. As a result, recording corresponding to the recording signal having the transfer rate of 1.4 Mbps by the EFM signal is performed on the magneto-optical disk 3.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Next, after the cartridge containing the recorded optical disk (or magneto-optical disk) 3 is mounted on the recording / reproducing apparatus, the recording / reproducing apparatus is set in the reproducing mode, and the cartridge 4 is A recorded optical disk (or magneto-optical disk) 3 having a diameter of 64 mm which is rotating at a predetermined rotation speed, and an optical head 6 is a recorded optical disk (or optical disk) which is rotating at a predetermined rotation speed inside the cartridge 4. A converging point of a laser beam for reading having a predetermined weak light intensity emitted from the objective lens 5 is generated at a position on the magnetic disk 3 where the recorded information is to be reproduced. As a result, reflected light including a reproduction signal having a transfer rate of 1.4 Mbps according to the EFM signal is provided from the recorded optical disk (or magneto-optical disk) 3 to the optical head 6 via the objective lens 5. Given to.

Claims (1)

[Claims] 1. An information amount is minimum 1 / N to maximum 1 / M (where N and M are numbers of 2 or more) by signal processing including an information amount compression means for an information signal to be recorded and reproduced. )
Means for obtaining digital data having a first transfer rate compressed to a range of, and digital data having the above-mentioned first transfer rate being modulated according to a predetermined modulation method and the above-mentioned first transfer Means for converting into digital data for recording and reproduction having a second transfer rate N times or more the rate, means for writing digital data for recording and reproduction having the above-mentioned second transfer rate into a recording medium, and recording Means for reading the digital data for recording and reproduction recorded on the medium at the above-mentioned second transfer rate;
The recording / reproducing digital data thus read is restored to digital data having a first transfer rate, and means for converting the digital data having the first transfer rate into a reproduction signal and outputting the reproduction signal. In the recording / reproducing apparatus, a means for performing the operation of writing the recording / reproducing digital data on the recording medium and the operation of reading the recording / reproducing digital data recorded on the recording medium in a time division manner. In addition, an input information signal that is targeted for recording and reproduction and is supplied to the recording and reproduction device, and a reproduction signal that is output from the recording and reproduction device based on the recording and reproducing digital data recorded on the recording medium. A recording / reproducing apparatus characterized in that it is brought into a state of being present as a simultaneous signal.