JP2830138B2 - Digital data recording and / or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Fields B Overview of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Function G Example G-1 Overall Configuration (FIG. 1) G-2 Recording Operation (FIGS. 1 and 2) G-3 Reproduction Operation (FIGS. 1 and 3) H Effect of the Invention A Industrial Field of the Invention The present invention provides a sampling frequency selected from a plurality of different sampling frequencies. The operation of recording digital data formed by the above method on a disk-shaped recording medium on which data can be written, or a plurality of different data from a disk-shaped recording medium on which data on which digital data has been recorded can be read. A digital data recording and / or reproducing operation for obtaining reproduced digital data formed at a sampling frequency selected from the sampling frequencies. It is related to the playback device.

B SUMMARY OF THE INVENTION A first aspect of the present invention is a digital data recording apparatus for recording digital data formed at a sampling frequency selected from a plurality of different sampling frequencies on a disk-shaped recording medium. Digital data formed with a frequency is written to the memory means at a write rate corresponding to the sampling frequency, and is read out intermittently from the memory means at a read rate corresponding to a frequency higher than the selected sampling frequency,
Recording data based on the digital data read from the memory means is formed and supplied to a movable writing means arranged on a disk-shaped recording medium provided with a spiral recording track forming portion. When digital data is not read in the memory means, the write position on the disk-shaped recording medium by the movable writing means is
The recording track forming unit is to repeatedly follow a specific one round with a one-track jump operation for each rotation of the disc-shaped recording medium, and is in a state where recording data is not recorded in the recording track forming unit. When reading digital data in the memory means, the writing position on the disk-shaped recording medium by the movable writing means to which the recording data is supplied continuously follows the recording track forming section. A relatively simple configuration and control system, for example, in which the recording data is recorded in the recording track forming section so that the rotational speed of the disk-shaped recording medium is kept constant, for example. Under the condition of a sampling frequency of any of a plurality of different sampling frequencies. Also Tal data, is obtained to be able to be properly recorded on the disc-shaped recording medium.

A second aspect of the present invention is a digital data reproducing apparatus for obtaining, from a disk-shaped recording medium on which digital data is recorded, reproduced digital data formed at a sampling frequency selected from a plurality of different sampling frequencies. Digital data formed with a predetermined sampling frequency based on the reading data obtained from the movable reading means provided for the disk-shaped recording medium provided with the spiral recording track forming section, Is written intermittently to the memory means at a write rate corresponding to the sampling rate, and read from the memory means at a read rate corresponding to a sampling rate selected from a plurality of different sampling frequencies lower than a predetermined sampling frequency. The output digital data is supplied to the data output unit, and when the digital data is written in the memory unit, the reading position of the movable reading unit on the disk-shaped recording medium continuously follows the recording track forming unit. When the digital data is not written in the memory means, the read position on the disk-shaped recording medium by the movable reading means is changed to a state in which read data is obtained from the recording track forming unit. By repeatedly following a specific round in the recording track forming section with a one-track jump operation for each rotation of, for example, the rotation speed of the disk-shaped recording medium is kept constant. With a relatively simple configuration and control system Also the digital data which are formed with any of the sampling frequency of the different sampling frequency, is obtained to be able to be reproduced properly from the disc-shaped recording medium.

Further, a third aspect of the present invention is a digital data recording / reproducing apparatus, which has both the functions and effects of the above-described digital data recording apparatus and digital data reproducing apparatus.

C Prior Art Digital data such as digital audio data is recorded on an information recording medium, and digital data is reproduced from the recorded information recording medium.
In a recorder, for example, for those used for business purposes rather than for general consumers, recording and reproduction can be performed for each of digital data formed at each of a plurality of different sampling frequencies. Is desired. For example, digital audio
For data, set the sampling frequency to 44.056KHz, 4
Recording and reproduction for 4.1KHz, 48KHz, etc. are required.

Therefore, for example, in a digital tape recorder using a magnetic tape as an information recording medium, usually,
As a clock signal for controlling the operation of each unit, a plurality of clock signals each having a frequency corresponding to a plurality of different sampling frequencies are prepared, and these are selectively used. It changes according to each of the different sampling frequencies. Therefore, such a digital tape recorder requires a complicated clock generation unit for transmitting a plurality of clock signals corresponding to each sampling frequency, a servo control circuit operating in a wide frequency range, various switching control units, and the like. However, the overall configuration becomes extremely complicated and the cost increases, and furthermore, various measures such as a built-in encoder, a decoder, a phase locked loop for extracting data, an equalizer, and the like increase the cost. It is also required to be performed.

Therefore, when recording each of the digital data formed with each of the plurality of different sampling frequencies using the magnetic tape, it is not necessary to switch the clock signal for controlling the operation of each unit and the switching speed of the magnetic tape. A recording apparatus as disclosed in JP-A-60-7651 has been proposed. In such a recording apparatus, a rotating magnetic head is used, and digital data to be recorded is recorded by the rotating magnetic head while forming an inclined recording track on a magnetic tape. A period during which each of the inclined recording tracks is formed is defined as a field period, a specific field frequency is selected, and the operating frequency of each unit is set based on the selected field frequency. , The number of data words of the digital data within the field period is changed.

D Problems to be Solved by the Invention However, when recording digital data formed at each of a plurality of different sampling frequencies on each magnetic tape as described above, switching of a clock signal for controlling the operation of each unit, A recording device that can eliminate the need for switching the running speed of a tape, etc., uses a recording medium as a magnetic tape, and further uses a rotating magnetic head to form an inclined recording track on the magnetic tape. For example, in the field of a recording or reproducing apparatus which records or reproduces digital data using a disk-shaped recording medium as a recording medium, the recording or reproducing apparatus is formed with each of a plurality of different sampling frequencies. Note that each digital data is recorded or reproduced. Or reproduction, for example, of as that formed to allow at Moto maintaining the rotational speed of the disc-shaped recording medium at a constant, a particular proposal has not been made.

In view of the above, the present invention provides a method of recording digital data on a writable disk-shaped recording medium, the digital data formed at any one of a plurality of different sampling frequencies, for example, a disk. Digital data recording device capable of properly recording data under a relatively simple configuration and control system in which the rotational speed of the linear recording medium is kept constant, and digital data In obtaining reproduced digital data from the disk-shaped recording medium on which the reproduced digital data is recorded, the reproduced digital data formed at any one of a plurality of different sampling frequencies is maintained at a constant rotational speed of the disk-shaped recording medium, for example. Relatively simple configuration and control system Under the digital data reproduction apparatus is to be able to obtain properly, and further,
It is an object of the present invention to provide a digital data recording / reproducing apparatus corresponding to a combination of the above-mentioned digital data recording apparatus and digital data reproducing apparatus.

E Means for Solving the Problems In order to achieve the above object, a digital data recording apparatus according to the present invention uses a disk-shaped recording medium provided with a spiral recording track forming section and capable of writing data. A rotating disk drive, movable writing means for writing data to a disk-shaped recording medium mounted on the disk drive, and a movable writing mechanism for rotating the disk-shaped recording medium by the disk drive; Recording position control means for controlling the writing position on the disk-shaped recording medium by the means; a data input section for obtaining digital data formed with a sampling frequency selected from a plurality of different sampling frequencies; Is written with a write rate corresponding to the selected sampling frequency of Memory means for intermittently reading data at a read rate corresponding to a frequency higher than the selected sampling frequency; and recording data for obtaining recording data based on digital data read from the memory means and supplying the recording data to the movable writing means. Supply means; and operation control means for controlling the recording position control means and the like. When the operation control means does not read the digital data in the memory means, the recording position control means has a disk-like form by the movable writing means. Control is performed so that the writing position on the recording medium repeatedly follows a specific round in the recording track forming unit with one track jump operation for each rotation of the disk-shaped recording medium. In the state where the recording data is not recorded, and in the memory means When digital data is read, the recording position control means continuously writes the write position on the disk-shaped recording medium by the movable writing means to which the recording data is supplied from the recording data supply means to the recording track forming unit. The control is performed so that the recording data is recorded in the recording track forming unit.

Further, a digital data reproducing apparatus according to the present invention is provided with a disk drive unit provided with a spiral recording track forming unit for rotatably driving a disk-shaped recording medium on which data can be read, and a disk drive unit mounted on the disk drive unit. Movable reading means for reading data from a disc-shaped recording medium,
Under the condition that the disk drive rotates the disk-shaped recording medium, reproduction position control means for controlling a reading position on the disk-shaped recording medium by the movable reading means, and reproduced digital data based on the read data obtained from the movable reading means. Read data processing means and read digital data obtained from the read data processing means are intermittently written at a write rate corresponding to a predetermined sampling frequency, and among a plurality of different sampling frequencies lower than the predetermined sampling frequency. A memory means for reading at a read rate corresponding to the sampling frequency selected from; a data output unit to which reproduced digital data read from the memory means is supplied;
Operation control means for controlling the reproduction position control means and the like, wherein the operation control means supplies read data to the read position processing means to the read position processing means when the reproduction digital data is written in the memory means. The read position of the disk-shaped recording medium by the movable reading means is controlled so as to continuously follow the recording track forming section, so that the read data can be obtained from the recording track forming section. When writing is not performed, the reproduction position control means
The reading position by the movable reading means is set to 1 of the disk-shaped recording medium.
It is configured to repeatedly follow a specific round in the recording track forming section with one track jump operation for each rotation.

Furthermore, a digital data recording / reproducing apparatus according to the present invention is configured as an integrated digital data recording apparatus and digital data reproducing apparatus.

F Function In the digital data recording device according to the present invention,
Digital data formed at a sampling frequency selected from a plurality of different sampling frequencies from the input unit is continuously written to a memory means at a writing rate corresponding to the selected sampling frequency, and the memory means Are read out intermittently at a reading rate corresponding to a frequency higher than the sampling frequency selected from. In such a case, the read control in the memory means is performed by the operation control means, and the digital data is read from the time when the accumulation of the digital data in the memory means becomes full to almost zero, and in the memory means. Reading of digital data is not performed from the time when the accumulation of digital data approaches zero to the time when it becomes full.

Then, during a period in which digital data is not read from the memory means and the recording data is not supplied to the movable writing means, the writing position on the disk-shaped recording medium by the movable writing means causes the one-track jump operation. Accompanying this, a recording position holding operation is performed, which is to repeatedly follow a specific round in the recording track forming section, so that recording data is not recorded on the recording track forming section, and During the period in which the digital data is read out and the recording data is supplied to the movable writing means, the recording position holding operation is completed, and the writing position on the disk-shaped recording medium by the movable writing means is changed to the recording track formation. The recording data is recorded in the recording track forming section. That state is taken.

By doing so, the rotation speed of the disk-shaped recording medium is kept constant, and the data processing circuit system does not need to include a clock switching corresponding part. Under the configuration and control system,
Even if the digital data from the input section is formed with any one of a plurality of different sampling frequencies, it is properly recorded on the disk-shaped recording medium.

In the digital data reproducing apparatus according to the present invention, the reproduced digital data obtained based on the read data from the movable reading means is intermittently written into the memory means at a write rate corresponding to a predetermined sampling frequency. At the same time, the data is continuously read from the memory means at a read rate corresponding to a frequency lower than the predetermined sampling frequency. In such a case, the writing control in the memory means is performed by the operation control means, and the writing of the reproduced digital data is performed from the time when the accumulation of the reproduced digital data in the memory means becomes close to zero to a full state, and Digital data is not written from the time when the storage of the reproduced digital data in the memory means becomes full to the time when it becomes close to zero.

During the period in which the reproduction digital data is written to the memory means, the reading position on the disk-shaped recording medium by the movable reading means is assumed to continuously follow the recording track forming section, and In a period in which read data is obtained from the memory means, and the read digital data is not written in the memory means, the reading position on the disk-shaped recording medium by the movable reading means is changed by one track jump operation to form a recording track. In this state, the reading position holding operation is performed, which is to repeatedly follow a specific rotation of the unit.

By doing so, the rotation speed of the disk-shaped recording medium is kept constant, and the data processing circuit system does not need to include a clock switching corresponding part. Under the configuration and control system,
Reproduced digital data formed at any one of a plurality of different sampling frequencies from the disk-shaped recording medium is properly obtained, and is derived from the output unit.

Further, the digital data recording / reproducing apparatus according to the present invention has the same effects as those of the digital data recording apparatus and the digital data reproducing apparatus according to the present invention.

G. Embodiment G-1 Overall Configuration (FIG. 1) FIG. 1 schematically shows an overall configuration of an example of a digital data recording / reproducing apparatus according to the present invention.

In this example, there is provided a disk mounting portion 11 on which the magneto-optical disk 10 is mounted with its central portion engaged, and the disk mounting portion 11 is rotatable about its central axis as a rotation axis. And is rotated by the motor 12. The disk mounting unit 11 and the motor 12 form a disk driving unit that rotates the magneto-optical disk 10 mounted on the disk mounting unit 11 at a predetermined rotation speed.

The magneto-optical disk 10 has, for example, its recording portion forming area 10
It is assumed that a plurality of spiral recording track forming portions surrounding the central portion are provided on the perpendicular magnetic film forming a. Above the magneto-optical disk 10 mounted on the disk mounting portion 11, the recording section forming area of the magneto-optical disk 10
An electromagnet 13 forming a magnetic field generating section for applying a magnetic field that changes in accordance with information to be recorded on the magneto-optical disk 10 is arranged on the magneto-optical disk 10a so as to be movable in the radial direction of the magneto-optical disk 10. The coil of the electromagnet 13 has an electromagnet drive
The drive current Id is supplied from 14, the electromagnet drive unit 14 receives the recording data described below, forms a drive current Id that changes according to the record data, and supplies the drive current Id to the coil of the electromagnet 13, whereby The electromagnet 13 generates a magnetic field that changes according to the recording data, and acts on the recording portion forming area 10a of the magneto-optical disk 10.

Also, a magneto-optical disk mounted on the disk mounting unit 11
An optical system component 15 including an optical element such as a light beam generating source and an objective lens is disposed below the optical system 10.
The optical system configuration unit 15 is to be moved in the radial direction of the magneto-optical disk 10 with the electromagnet 13 by the mechanically connected optical system feed drive unit 16, and together with the electromagnet 13,
A movable writing / reading unit for the magneto-optical disk 10 is configured.

The objective lens 15L incorporated in the optical system configuration unit 15 maintains a positional relationship to face the electromagnet 13 with the magneto-optical disk 10 mounted on the disk mounting unit 11 therebetween. The objective lens 15L is adjusted in position by a focus control drive unit and a tracking control drive unit (not shown) so as to approach and separate from the magneto-optical disk 10 along its optical axis. The position is adjusted in the radial direction of the magneto-optical disk 10, which is the direction orthogonal to the optical axis. In the optical system configuration unit 15,
In addition to the objective lens 15L, a laser element having a predetermined wavelength, a laser element as a light beam generating source for generating a laser light beam which is made incident on the recording portion forming area 10a of the magneto-optical disk 10 through the objective lens 15L, Lens 15
The laser light beam incident on the magneto-optical disk 10 via L is reflected by the magneto-optical disk 10, and again,
Signal formation for forming various signals of read data, a focus error signal, and a tracking error signal based on a light detection unit to be guided after passing through the objective lens 15L and a detection output obtained from the light detection unit. A circuit section is built in. The position of the laser beam incident from the optical system component 15 through the objective lens 15L to the recording portion forming region 10a of the magneto-optical disk 10 is a movable document including the electromagnet 13 and the optical system component 15. The write / read position on the magneto-optical disk 10 by the read / write means.

The electromagnet drive unit 14 includes a data input terminal 20, an input interface unit 21, a buffer memory 22, and an encoder 2.
3 is connected, and the signal forming circuit unit built in the optical system configuration unit 15 includes:
A reproduction system PL including a reproduction amplification unit 25, a decoder 26, a buffer memory 27, and an output interface unit 28 is connected. And these recording system RE and reproduction system PL
For example, the frequencies obtained from the master clock generator 30, the sampling frequency dependent clock generator 31, and the master clock generator 30, for example,
Any of the pulse signals C1, C2 and C3 set to 44.056 KHz, 44.1 KHz and 48 kHz, or the external synchronization pulse signal CE obtained from the input interface unit 21 in the recording system RE is selected and sent to the sampling frequency dependent clock generation unit 31. A supply selection switch 32 is provided. The master clock generator 30 generates a master clock signal CM having a higher frequency than each of the pulse signals C1, C2 and C3 and the external synchronization pulse signal CE, and outputs the master clock signal CM to the recording system RE.
, And the decoder 26 and the buffer memory 27 in the reproduction system PL, respectively, and the sampling frequency dependent clock generation unit 31 supplies the pulse signals C1, C2 and C3 and the external synchronization pulse signal CE. And supplies the clock signal CS to the input interface unit 21 and the buffer memory 22 in the recording system RE, and to the buffer memory 27 and the output interface unit 28 in the reproduction system PL.

Further, there is provided a control unit 40 for controlling the operation of each of the above-mentioned disk drive means, movable writing / reading means, recording system RE, reproduction system PL, and selection switch 32. The control unit 40 is connected to, for example, an operation input unit 41 configured using a keyboard.

G-2 Recording Operation (FIGS. 1 and 2) Under such circumstances, the recording portion forming area 10 of the magneto-optical disk 10 is
When digital data is recorded in the recording track forming unit provided in a, the digital data is supplied to the data input terminal 20 and the operation input unit 41
Instructs one of the pulse signals C1, C2 and C3 and the external synchronization pulse signal CE to be selected according to the recording state and the sampling frequency of the digital data supplied to the data input terminal 20 The command signal GK is supplied to the control unit 40. Thereby, the control unit
40, the motor control signal QM is supplied to the motor control unit 42, the laser drive signal QL is supplied to the laser element built in the optical system configuration unit 15, and the motor drive signal Sm is supplied from the motor control unit 42 to the motor 12 And the motor 12 is turned on, the magneto-optical disk 10 is rotated at a predetermined rotational speed, and the laser element is set in a state of generating a laser light beam. The laser light beam is made incident on the recording portion forming area 10a of the magneto-optical disk 10 through 15L.

Then, a tracking error signal ET and a focus error signal EF obtained from a signal forming circuit unit incorporated in the optical system configuration unit 15 are supplied to the control unit 40, and tracking based on the tracking error signal ET is performed from the control unit 40. The state in which the control signal QT is supplied to the tracking control unit 43 and the drive signal St is supplied from the tracking control unit 43 to the tracking control driving unit provided in association with the objective lens 15L in the optical system configuration unit 15. And a focus control signal QF based on the focus error signal ET from the control unit 40.
The drive signal Sf is supplied to the focus control unit 44, and the drive signal Sf is supplied from the focus control unit 44 to the focus control drive unit provided in association with the objective lens 15L in the optical system configuration unit 15. Further, in such a case, the one-track jump signal QJ synchronized with the rotation of the magneto-optical disk 10 is supplied from the control unit 40 to the tracking control unit 43, and is supplied from the tracking control unit 43 to the tracking control driving unit. It is assumed that the drive signal St has the one-track jump signal QJ inserted. As a result, a laser light beam which is made to enter the recording section forming area 10a of the magneto-optical disc 10 from the optical system constituting section 15 through the objective lens 15L is provided in the recording section forming area 10a with the rotation of the magneto-optical disc 10. A one-track jump operation in the direction of returning to the original position is performed for each rotation of the magneto-optical disk 10 while following the recording track forming section, and as a result, the recording track forming section repeatedly follows a specific round. It is assumed that the incident position is held.

Under such circumstances, the operation input unit
The switch control signal QS according to the command signal GK from 41 is supplied to the selection switch 32, and the selection switch 32 indicates the pulse signal C1, C2 and C3 and the external synchronization pulse signal CE indicated by the command signal GK. Is selected and supplied to the sampling frequency dependent clock generator 31. And a sampling frequency dependent clock generator
A clock signal CS having a frequency corresponding to a selected one of the pulse signals C1, C2 and C3 and the external synchronization pulse signal CE is obtained from the input interface unit 21.
Supplied to At the same time, the control signal SI is supplied as an enable signal to the input interface unit 21 from the control unit 40, and assuming that such a time is t1, as shown in FIG. 2A, the input interface unit 21 Digital data DD formed with a sampling frequency corresponding to the frequency of the clock signal CS is obtained from the input interface unit 21 by being changed from the non-operation state (IOP) to the operation state (OP).
Supplied to 22.

The clock signal CS from the sampling frequency dependent clock generator 31 is supplied to the buffer memory 22 as a write signal, so that the digital data DD is continuously stored in the buffer memory 22 at a write rate corresponding to the frequency of the clock signal CS. Is written to the buffer memory 22
As shown in FIG. 2B,
It increases after time t1. Then, as shown in FIG. 2B, the data storage amount in the buffer
When the buffer memory 22 becomes full at t2, the buffer memory 22 becomes empty as shown in FIG.
P) to the full status (FULL), and the full status signal MF is sent from the buffer memory 22 to the control unit 40.
Is supplied.

When the full status signal MF is supplied to the control unit 40, the control signal SE is supplied as an enable signal from the control unit 40 to the encoder 23, and as shown in FIG. Inactive state (IO
P) to the operating state (OP), and the digital data DD stored in the buffer memory 22 accordingly.
Is read from the buffer memory 22 at a read rate corresponding to the frequency of the master clock signal CM supplied thereto as a read signal, and is supplied to the encoder 23 as digital data DD '. In the encoder 23, the digital data DD ′ from the buffer memory 22 is subjected to a recording encoding process to form recording data RD, which is supplied to the electromagnet driving unit 14. As a result, the driving current Id having a change corresponding to the recording data RD is supplied from the electromagnet driving unit 14 to the coil of the electromagnet 13.

On the other hand, in such a case, the transmission of the one-track jump signal QJ from the control unit 40 is stopped, and the feed control signal QH is supplied from the control unit 40 to the optical system feed drive unit 16 so that the optical system feed drive The unit 16 is turned on, whereby a laser light beam that is made to enter the recording unit forming area 10a of the magneto-optical disk 10 from the optical system configuration unit 15 through the objective lens 15L as shown in FIG. Time
At t2, the optical disk 10 is released from the incident position hold state (TJH) and enters a normal operation state (NOR) in which the magneto-optical disk 10 rotates and continuously follows the recording track forming unit. Further, in such a case, the laser drive signal QL supplied from the control unit 40 to the laser element incorporated in the optical system configuration section 15 is assumed to increase the output of the laser element, and the recording section of the magneto-optical disk 10 is formed. It is assumed that the laser light beam incident on the area 10a has sufficient intensity to perform recording in the recording track forming section.

As a result, from time t2, the recording data RD obtained from the encoder 23 is stored in the recording area 10a of the magneto-optical disk 10.
Is recorded in the recording track forming section provided in the recording medium.

In this way, during the period in which the recording data RD is recorded, the buffer memory 22
At the same time that the digital data DD from 21 is written at a write rate corresponding to the frequency of the clock signal CS,
Since the written digital data DD is read at a read rate corresponding to the frequency of the master clock signal CM which is higher than the frequency of the clock signal CS, the amount of data stored in the buffer memory 22 is as shown in FIG. As shown in B, it decreases after time t2. Then, as shown in FIG. 2B, when the amount of data stored in the buffer memory 22 becomes close to zero at time t3, as shown in FIG.
Changes from the full status to the empty status, and the empty status signal ME is supplied from the buffer memory 22 to the control unit 40.

When the empty status signal ME is supplied to the control unit 40, the control signal SE supplied from the control unit 40 to the encoder 23 is made a disable signal, and as shown in FIG. The digital data DD stored in the buffer memory 22 is no longer read from the buffer memory 22 and the digital data DD stored in the buffer memory 22 is no longer read from the buffer memory 22. The supply is not performed, and therefore, the drive current Id is not supplied from the electromagnet drive unit 14 to the coil of the electromagnet 13.

On the other hand, in such a case, the supply of the one-track jump signal QJ from the control unit 40 to the tracking control unit 43 is restarted, and the feed control signal QH
2 is stopped, whereby the laser beam emitted from the optical system component 15 through the objective lens 15L to the recording portion forming region 10a of the magneto-optical disk 10 is changed to the laser beam shown in FIG.
As shown in (2), at the time point t3, the incident position is held again. Further, in such a case, the laser drive signal QL supplied from the control unit 40 to the laser device incorporated in the optical system configuration unit 15 reduces the output of the laser device, and the recording of the magneto-optical disk 10 is performed. It is assumed that the laser beam incident on the portion forming region 10a has insufficient intensity for performing recording in the recording track forming portion.

As a result, from time t3, the recording data RD is not recorded in the recording track forming section provided in the recording section forming area 10a of the magneto-optical disk 10.

In this manner, during the period when the recording data RD is not recorded, the buffer memory 22 writes and writes the digital data DD from the input interface unit 21 at a writing rate corresponding to the frequency of the clock signal CS. Since it is assumed that the digital data DD is not read out, the amount of data stored in the buffer memory 22 increases after time t3 as shown in FIG. 2B, and between the time t1 and time t2. The state is the same as the period. Then, the period in which the recording data RD is not recorded and the period in which the recording data RD is recorded as described above are repeated.

At the end of the recording operation, a command signal GK instructing that the recording state should be ended is supplied to the control unit 40 from the operation input unit 41, but the command signal GK instructing that the recording state should be ended. For example, when the buffer memory 22 is changed from the empty status to the full status and is supplied to the control unit 40 at a time t5 after the time t4 at which the period in which the recording of the recording data RD is started, Switch control signal from control unit 40
While the transmission of QS is stopped, the control signal SI supplied from the control unit 40 to the input interface unit 21 is made a disable signal, and as shown in FIG. 2A, the input interface unit 21 is activated at time t5. State from the inactive state to the input interface section 21
Therefore, digital data DD formed with a sampling frequency corresponding to the frequency of the clock signal CS cannot be obtained. Therefore, the digital data DD is not written into the buffer memory 22, and the buffer memory
As shown in FIG. 2B, the amount of accumulated data at 22 sharply decreases after time t5. Then, as shown in FIG. 2B, when the amount of data stored in the buffer memory 22 becomes close to zero at time t6, the buffer memory 22 changes from the full status to the empty status as shown in FIG. 2C. Then, the empty status signal ME is supplied from the buffer memory 22 to the control unit 40.

When the empty status signal ME is supplied to the control unit 40 at the time point t6, the control signal SE supplied from the control unit 40 to the encoder 23 is disabled, and as shown in FIG. At time t6
The digital data DD stored in the buffer memory 22 is not read out from the buffer memory 22 at this time, and the digital data DD stored in the buffer memory 22 is not read out from the buffer memory 22.
The supply of RD is not performed, and therefore, the drive current Id is not supplied from the electromagnet driving unit 14 to the coil of the electromagnet 13. At the same time, the supply of the one-track jump signal QJ from the control unit 40 to the tracking control unit 43 is restarted, and the transmission of the feed control signal QH from the control unit 40 is stopped. The laser light beam which is incident on the recording portion forming area 10a of the magneto-optical disk 10 from the optical disk 15 through the objective lens 15L
As shown in FIG. E, at time t6, it is assumed that the incident position is held, and the control unit
The laser drive signal QL supplied from 40 to the laser element incorporated in the optical system configuration section 15 is assumed to reduce the output of the laser element, and the recording section forming area 10a of the magneto-optical disk 10
The laser light beam incident on the recording track forming section is determined to have insufficient intensity to perform recording in the recording track forming section, and the recording operation is terminated.

G-3 Reproducing Operation (FIGS. 1 and 3) Next, in reproducing digital data recorded in the recording track forming section provided in the recording section forming area 10a of the magneto-optical disk 10, an optical system is used. After the read data PD obtained from the signal forming circuit unit incorporated in the configuration unit 15 is amplified by the reproduction amplification unit 25 constituting the reproduction system PL, a decoding process is performed by the decoder 26 to generate the reproduction digital data PDD. Then, the data is written to the buffer memory 27 at a write rate corresponding to the frequency of the master clock signal CM. For example, the reproduced digital data PDD is written to the buffer memory 27 in advance, and the data storage amount in the buffer memory 27 is full. The buffer memory 27 is in the full status, and the magneto-optical disk 1 is transmitted from the optical system configuration unit 15 through the objective lens 15L.
Assuming that the reproducing operation is started in a state where the laser light beam incident on the recording section forming area 10a of 0 is in the incident position holding state, first, from the operation input unit 41, the reproducing state is started. Pulse signal C to be selected according to the sampling frequency of digital data to be derived from the output interface unit 28
A command signal GK instructing one of C1, C2, and C3 is supplied to the control unit 40. Thereby, the switch control signal QS corresponding to the command signal GK from the operation input unit 41 is supplied from the control unit 40 to the selection switch 32, and the selection switch 32 causes the command signal GK of the pulse signals C1, C2, and C3 to be output. Is selected and supplied to the sampling frequency dependent clock generator 31.
Then, a clock signal CS having a frequency corresponding to the selected one of the pulse signals C1, C2, and C3 is obtained from the sampling frequency dependent clock generation unit 31, and is read out to the buffer memory 27 in the reproduction system PL as a read signal. As well as being supplied to the output interface unit 28. At the same time, a control signal SO is supplied as an enable signal from the control unit 40 to the output interface unit 28, and if such a time is denoted by t1 ', as shown in FIG. ′, The reproduction digital data PDD stored in the buffer memory 27, which has been changed from the inactive state (IOP) to the operational state (OP) and is in the full status (FULL), is sampled at the sampling frequency. The signal is read at a read rate corresponding to the frequency of the clock signal CS from the dependent clock generator 31, and is supplied to the output interface 28 as a digital signal PDD '. Thereby, digital data which is formed with a sampling frequency corresponding to the frequency of the clock signal CS is derived from the output interface unit 28.

Reproduced digital data stored in buffer memory 27
The reading of the PDD from the buffer memory 27, which is to be a digital signal PDD ', is performed continuously at a write rate corresponding to the frequency of the clock signal CS, whereby the amount of data stored in the buffer memory 27 is increased. But the third
As shown in FIG. B, it decreases after time t1 '. Then, the data storage amount in the buffer memory 27 becomes the third
As shown in FIG. B, when the value approaches zero at time t2 ', the buffer memory 27 changes from the full status to the empty status (EMP) as shown in FIG. Is supplied with an empty status signal ME '.

When the empty status signal ME 'is supplied to the control unit 40, the control unit 40
The transmission of the one-track jump signal QJ to 43 is stopped, and the feed control signal QH is supplied from the control unit 40 to the optical system feed drive unit 16, and the optical system feed drive unit 16 is activated, whereby Objective lens from the optical system component 15
As shown in FIG. 3E, at time t2 ', the laser light beam incident on the recording portion forming area 10a of the magneto-optical disk 10 through the light-receiving position 15L through the incident position hold state (TJ
H), the normal operation state (NO) in which the recording track forming section is continuously followed by the rotation of the magneto-optical disk 10
R). Further, in such a case,
The laser drive signal QL supplied from the control unit 40 to the laser element built in the optical
The laser light beam incident on the ten recording portion forming areas 10a has an intensity suitable for reading data from the recording track forming portion.
As a result, from time t2 ′, reading from the recording track forming section provided in the recording section forming area 10a of the magneto-optical disk 10 by the laser light beam is performed, and the signal forming circuit built in the optical system configuring section 15 is performed. The read data PD from the recording track forming section provided in the recording section forming area 10a of the magneto-optical disk 10 is derived from the section, and is supplied to the decoder 26 via the reproduction amplifying section 25.

At the same time, the control unit 40 sends the decoder 26
The control signal SD is supplied as an enable signal to the third
As shown in FIG. D, the decoder 26 is changed from the non-operation state (IOP) to the operation state (OP) at time t2 ', and accordingly, the read signal supplied to the decoder 26 via the reproduction amplifier 25 is read. The data PD is subjected to a decoding process by the decoder 26, and reproduced digital data PDD based on the read data PD is obtained from the decoder 26 and supplied to the buffer memory 27. In this way, the reproduced digital data PDD formed based on the read data PD sequentially obtained from the magneto-optical disk 10 and supplied to the buffer memory 27 is supplied to the buffer memory 27 by the master clock supplied as a write signal. Writing is performed at a read rate corresponding to the frequency of the signal CM.

In this manner, the data read from the magneto-optical disk 10 is read.
During the period in which the playback digital data PDD based on the PD is obtained, the buffer memory 27 stores the playback digital data.
The PDD is written at a write rate corresponding to the frequency of the master clock signal CM, which is assumed to be higher than the frequency of the clock signal CS, and at the same time, the reproduced digital data PDD written is written at a read rate corresponding to the frequency of the clock signal CS. Since the data is read, the amount of data stored in the buffer memory 27 increases after the time point t2 ', as shown in FIG. 3B. And the third
As shown in FIG. B, at time t3 ', the buffer memory
When the data storage amount at 27 becomes full, FIG.
The buffer memory 27 changes from the empty status to the full status as shown in FIG.
27 supplies a full status signal MF 'to the control unit 40.

When the full status signal MF 'is supplied to the control unit 40, the supply of the one-track jump signal QJ from the control unit 40 to the tracking control unit 43 is restarted, and the transmission of the feed control signal QH from the control unit 40 is performed. Is stopped, whereby the objective lens 15L
As shown in FIG. 3E, the laser light beam incident on the recording portion forming area 10a of the magneto-optical disk 10 through the laser beam is again brought into the incident position holding state at time t3 ', and Read data PD from the disk 10 cannot be obtained. Further, the control signal SD supplied from the control unit 40 to the decoder 26 is made a disable signal, and as shown in FIG.
At 3 ', the operation state is changed from the operation state to the non-operation state, so that the reproduction digital data PDD in the buffer memory 27 is not written.

In this manner, the data read from the magneto-optical disk 10 is read.
In the period after the time point t3 'at which the PD cannot be obtained, the buffer memory 27 does not write the reproduced digital data PDD, and reads the stored reproduced digital data PDD at a write rate corresponding to the frequency of the clock signal CS. As shown in FIG. 3B, the amount of data stored in the buffer
Starting from 3 ', the state becomes the same as the period between the time points t1' and t2 '. Then, the period during which the read data PD from the magneto-optical disk 10 is not obtained and the period during which the read data PD from the magneto-optical disk 10 are obtained are repeated.

At the end of the reproduction operation, a command signal GK instructing that the reproduction state should be ended is supplied to the control unit 40 from the operation input unit 41, and the command signal GK instructing that the reproduction state should be ended. However, for example, at time t5 'after time t4' when the buffer memory 27 changes from the full status to the empty status and the period during which the read data PD from the magneto-optical disk 10 is obtained is started, the control unit 40 , The transmission of the switch control signal QS from the control unit 40 is stopped,
The control signal SO supplied from the control unit 40 to the output interface unit 28 is made a disable signal, and as shown in FIG. 3A, the output interface unit 28 is turned on at time t5 '.
At the time, the operation state is changed from the operation state to the non-operation state.Accordingly, the reading of the reproduction digital data PDD from the buffer memory 27 is stopped, and the sampling frequency corresponding to the frequency of the clock signal CS from the output interface unit 28 is used. The digital data to be formed is no longer derived, and the reproducing operation is terminated.

As shown in FIG. 3B, even after time t5 ', the reproduced digital data
The writing of the PDD is continued until the data storage amount in the buffer memory 27 becomes full.

H Advantageous Effects of the Invention As is apparent from the above description, according to the digital data recording apparatus of the present invention, when recording digital data on a writable disk-shaped recording medium,
With a relatively simple configuration and control system, the rotation speed of the disk-shaped recording medium is kept constant and the data processing circuit system including the encoder and the like does not need to include a clock switching corresponding unit. Digital data formed at any one of a plurality of different sampling frequencies can be properly recorded.

Further, according to the digital data reproducing apparatus of the present invention, in obtaining reproduced digital data from a disk-shaped recording medium on which digital data is recorded, the rotation speed of the disk-shaped recording medium is kept constant, and a decoder and the like are used. It is unnecessary to provide a data processing circuit system including a clock switching corresponding unit and the like. A reproduction formed at any one of a plurality of different sampling frequencies under a relatively simple configuration and control system. Digital data can also be properly obtained.

Further, the digital data recording / reproducing apparatus according to the present invention has both the functions and effects of the above-described digital data recording apparatus and digital data reproducing apparatus according to the present invention.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an example of a digital data recording / reproducing apparatus according to the present invention. FIGS. 2A to 2E are time charts for explaining a recording operation in the example shown in FIG. 3A to E are time charts for explaining the reproducing operation in the example shown in FIG. In the figure, 10 is a magneto-optical disk, 11 is a disk mounting part, 13 is an electromagnet, 15 is an optical system constituent part, 21 is an input interface part, 22 and 27 are buffer memories, 23 is an encoder, 26 is a decoder, and 28 is an output. An interface unit, 30 is a master clock generation unit, 31 is a sampling frequency dependent clock generation unit, 40 is a control unit, 41 is an operation input unit, RE is a recording system, and PL is a reproduction system.

Continuation of the front page (72) Inventor Kazuyuki Hishida 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 21/08 G11B 20 / 10 301

Claims (3)

(57) [Claims] 1. A disk drive section provided with a spiral recording track forming section and rotatably driving a disk-shaped recording medium on which data can be written, and the disk-shaped recording medium mounted on the disk drive section Movable writing means for writing data to the disk, and a recording position for controlling a writing position on the disk-shaped recording medium by the movable writing means when the disk-shaped recording medium is rotated by the disk drive unit. Control means; a data input unit for obtaining digital data formed at a sampling frequency selected from a plurality of different sampling frequencies; and the digital data is written at a write rate corresponding to the selected sampling frequency. Together with frequencies higher than the sampling frequency selected above. Memory means for intermittently reading at a corresponding read rate; recording data supply means for obtaining recording data based on digital data read from the memory means and supplying the recording data to the movable writing means; When the digital data is not read, the recording position control means sets the writing position by the movable writing means in the recording track forming section together with a one-track jump operation for each rotation of the disk-shaped recording medium. When a control is performed so as to repeatedly follow a specific round, the recording data is not recorded in the recording track forming section, and the digital data is read in the memory means. The recording data from the recording data supply means to the recording position control means. Control is performed so that the write position by the movable writing means to which the data is supplied continuously follows the recording track forming unit, so that the recording data is recorded in the recording track forming unit. A digital data recording device comprising: an operation control unit. 2. A disk drive unit provided with a spiral recording track forming unit and rotatably driving a disk-shaped recording medium from which data can be read, and the disk-shaped recording medium mounted on the disk drive unit Movable reading means for reading data from the disk, and reproducing position control means for controlling a reading position on the disk-shaped recording medium by the movable reading means when the disk-shaped recording medium is rotated by the disk drive unit. Read data processing means for obtaining reproduced digital data based on the read data obtained from the movable reading means, and wherein the reproduced digital data obtained from the read data processing means is intermittently written at a writing rate corresponding to a predetermined sampling frequency. And a plurality of different sub-samples lower than the predetermined sampling frequency. A memory means for reading at a read rate corresponding to a sampling frequency selected from the sampling frequencies; a data output unit to which reproduced digital data read from the memory means is supplied; When writing is performed, the reproduction position control means controls the read position by the movable reading means for supplying read data to the read data processing means so as to continuously follow the recording track forming section. A state where the read data is obtained from the recording track forming section, and when the reproduction digital data is not written in the memory means, the reproduction position control means
An operation control means for performing control for causing the reading position of the movable reading means to repeatedly follow a specific one round in the recording track forming section with a one-track jump operation for each rotation of the disk-shaped recording medium; When,
A digital data reproducing device comprising: 3. A disk drive unit provided with a spiral recording track forming unit and rotatably driving a disk-shaped recording medium on which data can be written and read, and the disk-shaped unit mounted on the disk drive unit A movable writing / reading unit for writing data to a recording medium or reading data from the disk-shaped recording medium; and a movable writing / reading unit for rotating the disk-shaped recording medium by the disk drive unit. Recording / reproducing position control means for controlling a writing position or a reading position on the disk-shaped recording medium by the reading means; and data for obtaining first digital data formed at a sampling frequency selected from a plurality of different sampling frequencies. An input unit, wherein the first digital data corresponds to the selected sampling frequency. Recording memory means written at a corresponding write rate and intermittently read at a read rate corresponding to a frequency higher than the selected sampling frequency; and a first digital memory read from the recording memory means. Recording data supply means for obtaining recording data based on data and supplying the recording data to the movable writing / reading means; read data processing means for obtaining second digital data based on the reading data obtained from the movable writing / reading means; The second digital data obtained from the read data processing means is intermittently written at a write rate corresponding to a predetermined sampling frequency, and is selected from a plurality of different sampling frequencies lower than the predetermined sampling frequency. The reading rate corresponding to the sampling frequency A read-out memory unit, a data output unit to which the second digital data read from the read-out memory unit is supplied, and a read-out of the first digital data in the recording memory unit. If not, the upper recording / re-position control means sets the writing position by the movable writing / reading means to a specific one-turn in the recording track forming section together with a one-track jump operation for each rotation of the disk-shaped recording medium. Control is performed so that the recording data is not repeatedly recorded in the recording track forming section, and the first digital data is read out in the recording memory means. When the recording data is supplied from the recording data supplying means to the upper recording re-position control means. A control is performed so that the writing position by the movable writing / reading means is continuously made to follow the recording track forming unit, so that the recording data is not recorded in the recording track forming unit. When the second digital data is written in the memory for writing, the reading position by the movable writing / reading means for supplying the read data to the read data processing means is recorded in the upper record re-position control means. When the control is made to continuously follow the track forming unit so that the read data is obtained from the recording track forming unit, and when the second digital data is not written in the reproduction memory means. And the upper recording / re-positioning means controls the reading position by the movable writing / reading means for one rotation per rotation of the disk-shaped recording medium. Digital data recording and reproducing apparatus configured and an operation control means for causing the formed control to be repeated following the specific one round in the recording track formed part with a click jump operation.