JPH07296507A - Recorder - Google Patents

Abstract

PURPOSE:To prevent overflow from occurring even for rapid sound recording/ stopping operation by setting a recording/stopping request time when the dummy data are added to a recording medium. CONSTITUTION:At the time of recording operation, the recording data are fetched and stored in a buffer RAM 13 of a storage means, and a prescribed minimum recording data amount is read out from the buffer RAM 13 as a recording data unit and supplied to a magnetic head 6 to be recorded on a magneto-optical disk 1 being the recording medium. At the time of recording stoppage request, when the recording data whose amt. is less than recording data unit are present as the recording data stored in the buffer RAM 13 and recorded on no magneto-optical disk 1, the dummy data are added to the data at time point when a prescribed time elapses after the issue of a recording stoppage request to make the data amt. the recording unit, and the data are recorded on the magneto-optical disk 1. Then, when the recording operation is re-started before the lapse of the prescribed time, the newly supplied recording data are fetched in the buffer RAM as the data succeeding to the recording data whose amt. is less than a recording data unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording data such as voice on a recording medium such as a disc.

[0002]

2. Description of the Related Art In a recording apparatus using a magneto-optical disk (MO disk) as a recording medium, input recording data is temporarily stored in a buffer memory, the data is read from the buffer memory at a predetermined timing and supplied to a recording head. There is one that I tried to record in.

For example, in a mini disc recorder, a recording data unit which is the minimum recording data amount of data to be recorded on a disc is determined, and a digital audio signal to be recorded is accumulated in a buffer memory and is equal to or more than the minimum recording data amount. When the data is accumulated, the data is read from the buffer memory for each recording data unit, supplied to the recording head, and recorded on the disk. At this time, the audio data to be input is continuously accumulated in the buffer memory, but the transfer bit rate of the data from the buffer memory to the recording head is the data of the system that stores the data in the buffer memory. The transfer bit rate is set higher than the transfer bit rate, and as a result, music data is continuously input, but recording is performed intermittently on the disc every time data of a recording data unit is accumulated. But it seems that there is no problem. In other words, when the input print data is continuously written in the buffer memory, the data is read out at high speed intermittently, but in record data units, so that the data normally overflows in the buffer memory. There is nothing to do.

The recording data on the mini disk has 4 sectors (1 sector = 2352 bytes) as shown in FIG.
The sub-data area and the main data area of 32 sectors are formed in a cluster CL (= 36 sectors-) unit, and the data amount of one cluster is the minimum recording data amount at the time of recording, that is, the recording data unit. One cluster corresponds to 2 to 3 rounds of tracks. The address is 1
Recorded for each sector.

The 4-sector sub-data area is used as a sub-data or linking area, and the TOC data and audio data are recorded in the 32-sector main data area. Further, the sectors are further subdivided into sound groups, and two sectors are divided into 11 sound groups. Then, in the sound group, 512 samples of data are recorded by being divided into two sound frames of L channel and R channel. One sound group has an audio data amount equivalent to 11.6 msec.

[0006]

By the way, in the case of a mini disk, one cluster (about 2 seconds of music data) is the minimum recording unit, and therefore the writing / reading operation to / from the buffer memory at the time of recording is not possible. It was done like 5.

That is, when the recording is started, the input music data is sequentially written into the buffer memory (F200), but the writing operation causes the data to be accumulated in the buffer memory for one cluster or more. Wait for things (F20
2). Then, when one cluster or more has been accumulated, one cluster of data is read out, supplied to the recording head, and recorded on the disk (F203).

Since recording is performed intermittently for each cluster in this way, if a recording stop operation is performed at a certain point (F
201), at that time, the data which has not been recorded on the disk still remains in the buffer memory, and the remaining data is less than 1 cluster in many cases. Since this remaining music data is the data that was input before the recording stop operation in terms of time, it must also be recorded on the disc, and therefore the remaining data that is less than one cluster will not be used as dummy data. As a result, "0" data is added to make the data amount for one cluster pseudo (F204).
The operation of adding the dummy data to form one cluster is referred to as "0-FILL". And 0-FI
The LL data is supplied from the buffer memory to the recording head and recorded on the disk (F205), and the recording operation is completed (F206).

However, since such 0-FILL is performed, when the recording operation and the stop operation are rapidly repeated, there is a problem that the data immediately overflows in the buffer memory. The buffer memory is divided into an area for holding the TOC data and an area for temporarily holding the audio data as shown in FIG. 6A. For example, when the buffer memory is composed of a 4 Mbit D-RAM, the audio data area is about The data capacity is 6 clusters. Considering the case where the user repeats the recording operation and the recording stop operation at a very fast motion, first, the data group D ₁ is changed from the first recording operation to the stop operation as shown in FIG. 6B. Although they are accumulated, 0-FILL is performed because the number of clusters is less than 1 at the time of the stop operation. Here, about 500 mse is required for recording one cluster of data on the disc.
It takes time c, but the recording operation is done more quickly,
When the stop operation is performed, the data group D ₂ is written and 0-FILL is performed as shown in FIG. 6C before the data group D ₁ is recorded on the disc.
That is, when very quick recording and stopping operations are repeated 6 times, the audio data area is used up as shown in FIG. 6D, and if the recording of the data group D _{1 on} the disc is not completed at this point, Even if data is input in the next recording operation, it cannot be written to the buffer memory. In other words, it will not be able to handle quick operations and will easily overflow.

[0010]

SUMMARY OF THE INVENTION In view of such problems, it is an object of the present invention to prevent the storage means from easily overflowing due to a quick operation.

That is, at the time of the recording operation, while recording data is taken in and stored in the storage means, a predetermined minimum recording data amount is read from the storage means as a recording data unit, supplied to the recording head, and recorded on the recording medium. In a recording device configured to perform recording, when there is recording data that is less than the recording data unit as recording data accumulated in the storage unit and not recorded in the recording medium at the time of recording stop request, recording stop is performed. When a predetermined time has elapsed from the request, dummy data is added to obtain a data amount of a recording data unit (0-FILL), recording is performed on the recording medium, and the recording operation is restarted before the predetermined time elapses. The newly supplied print data should be taken into the storage means as data that is continuous with the print data that is less than the print data unit. So that a control means for performing control.

[0012]

When a recording stop request is made, a predetermined time (several seconds) is waited until the 0-FILL is executed, and if the recording operation is restarted before the predetermined time elapses, the 0-FILL is not performed and the newly supplied recording is performed. By taking the data into the storage means as data that is continuous with the recording data that is less than the recording data unit, overflow of the storage means due to a small amount of music data and a large amount of dummy data is eliminated. That is, waiting for a predetermined time until the 0-FILL is executed is a process for preventing the 0-FILL from being performed in the case of rapid repeated recording / stop recording operations.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A recording / reproducing apparatus using a magneto-optical disk as a recording medium will be described below as an embodiment of the recording apparatus of the present invention with reference to FIGS. FIG. 1 is a block diagram of a main part of the recording / reproducing apparatus of the embodiment. In FIG. 1, 1
Indicates a magneto-optical disk on which audio data is recorded, and the magneto-optical disk 1 is driven to rotate by a spindle motor 2. An optical head 3 irradiates the magneto-optical disk 1 with a laser beam during recording / reproduction, which provides a high level laser output for heating the recording track to the Curie temperature during recording, and the magnetic Kerr effect during reproduction. It provides a relatively low level laser power for detecting data from reflected light.

For this reason, the optical head 3 is equipped with a laser diode as a laser output means, an optical system including a deflecting beam splitter, an objective lens and the like, and a detector for detecting reflected light. The objective lens 3a is held by the biaxial mechanism 4 so as to be displaceable in the disc radial direction and the direction in which the disc moves toward and away from the disc.

Reference numeral 6 denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, which is arranged at a position facing the optical head 3 with the magneto-optical disk 1 interposed therebetween. The entire optical head 3 and the magnetic head 6 are movable in the disk radial direction by a sled mechanism 5.

By the reproducing operation, the information detected from the magneto-optical disk 1 by the optical head 3 is supplied to the RF amplifier 7. The RF amplifier 7 calculates the supplied information by reproducing RF signals, tracking error signals, focus error signals, and absolute position information (absolute position information recorded as pregrooves (wobbling grooves) on the magneto-optical disk 1). Address information, focus monitor signal, etc. are extracted. Then, the extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error signal and the focus error signal are supplied to the servo circuit 9, and the address information is supplied to the address decoder 10. Further, the absolute position information and the focus monitor signal are supplied to the system controller 11 configured by, for example, a microcomputer.

The servo circuit 9 generates various servo drive signals according to the supplied tracking error signal, focus error signal, track jump command, seek command from the system controller 11, rotational speed detection information of the spindle motor 2, etc. Shaft mechanism 4 and sled mechanism 5
To perform focus and tracking control, and control the spindle motor 2 to a constant angular velocity (CAV) or a constant linear velocity (CLV).

The reproduced RF signal is sent to the encoder / decoder unit 8
After the EFM demodulation and the decoding process such as CIRC are performed by the memory controller 12, the buffer RAM 13 is temporarily processed by the memory controller 12.
Written in. The buffer RAM 13 is, for example, 4 Mbit
Of the D-RAM, a TOC data storage area and a recording / playback data temporary storage area are set therein, and the recording / playback data temporary storage area has a data capacity corresponding to, for example, about 6 clusters. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduced data in the system from the optical head 3 to the buffer RAM 13 are 1.41 Mbit / sec, and are intermittently performed.

The data written in the buffer RAM 13 is read at a timing at which the reproduction data is transferred at 0.3 Mbit / sec, and is supplied to the encoder / decoder section 14. Then, a reproduction signal process such as a decoding process for the audio compression process is performed to obtain an output digital signal.

The output digital signal is converted into an analog signal by the D / A converter 15, and the analog line output terminal 1
6A is supplied. Alternatively, it is directly supplied to the digital output terminal 16D without being converted to analog.

Here, writing / reading of data to / from the buffer RAM 13 during reproduction is performed by being addressed by the memory controller 12 under the control of the write pointer and the read pointer, and the write pointer (write address).
Is incremented at a timing of 1.41 Mbit / sec as described above, while the read pointer (read address) is 0.
Since the data is incremented at a timing of 3 Mbit / sec, due to the difference between the bit rates of writing and reading, a certain amount of data is stored in the buffer RAM 13. When the full capacity of data is accumulated in the buffer RAM 13, the increment of the write pointer is stopped, and the data read operation from the magneto-optical disk 1 by the optical head 3 is also stopped. However, since the read pointer R is continuously incremented, the reproduced voice output is not interrupted.

Thereafter, only the read operation is continued from the buffer RAM 13, and at some point the buffer RAM 13
Assuming that the amount of data stored therein is equal to or less than a predetermined amount, the data reading operation by the optical head 3 and the increment of the write pointer are restarted again, and the data is again stored in the buffer RAM 13.

By outputting the reproduced sound signal via the buffer RAM 13 as described above, the reproduced sound output is not interrupted even if the tracking is missed due to a disturbance or the like, and the data accumulation remains. By accessing the correct tracking position and restarting the data reading, the operation can be continued without affecting the reproduction output. That is, the seismic resistance function can be significantly improved.

In FIG. 1, address information output from the address decoder 10 and subcode data used for control operation are supplied to the system controller 11 via the encoder / decoder section 8 and used for various control operations. Further, the lock detection signal of the PLL circuit that generates the bit clock for the recording / reproducing operation and the monitor signal of the missing state of the frame synchronization signal of the reproduction data (L and R channels) are also supplied to the system controller 11.

Further, the system controller 11 outputs a laser control signal S _LP for controlling the operation of the laser diode in the optical head 3 to control the output of the laser diode on / off, and at the time of on control, the laser It is possible to switch between an output at the time of reproduction in which the power is at a relatively low level and an output at the time of recording in which the power is at a relatively high level.

When a recording operation is performed on the magneto-optical disk 1, an analog audio signal is connected to the analog input terminal 17A or an audio optical cable connected to the digital input terminal 17D. Alternatively, a digital audio signal is supplied.

Digital data with digital input terminal 17D
The audio signal sent to is directly supplied to the encoder / decoder unit 14. The analog audio signal input from the analog input terminal 17A is converted into digital data by the A / D converter 18 and then supplied to the encoder / decoder unit 14.

The encoder / decoder unit 14 performs audio compression encoding processing on the input digital audio signal. The recording data compressed by the encoder / decoder unit 14 is once written in the buffer RAM 13 by the memory controller 12, is also read at a predetermined timing, and is sent to the encoder / decoder unit 8.

As described above, data is temporarily stored in the buffer RAM 13 even during the recording operation. In this case, the control of the write pointer and the read pointer is the reverse of the above-described reproduction operation, that is, the write pointer (write Address) is 0.3M
The supplied data (recording data) is incremented at the timing of bit / sec and stored. Then, every time data of one cluster or more is stored in the buffer RAM 13, the operation of reading data by the read pointer (read address) incremented at the timing of 1.41 Mbit / sec is equivalent to one cluster. It will be executed intermittently in units of data.

The data read from the buffer RAM 13 is subjected to encoding processing such as CIRC encoding and EFM modulation in the encoder / decoder section 8 and then supplied to the magnetic head drive circuit 15. Magnetic head drive circuit 15
Supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the N or S magnetic field is applied to the magneto-optical disk 1 by the magnetic head 6. At this time, the system controller 11 also supplies a control signal to the optical head so as to output a laser beam of a recording level.

Reference numeral 19 denotes an operation input section provided with keys used for user operation, which includes reproduction / fast-forward / fast-reverse / AM.
There are provided operation keys for S search / stop / recording, operation keys for setting various operation modes, and operation keys for performing various editing processes. Reference numeral 20 denotes a display unit such as a liquid crystal panel, which displays the operating state, mode state, reproduction progress time, recording progress time, track number, etc. under the control of the system controller 11.

By the way, when the recording / reproducing operation is performed on the disk 1, the management information recorded on the disk 1, that is, P-TOC (pre-mastered TOC), U-
The TOC (user TOC) is read out, and the system controller 11 determines the address of the part to be recorded on the disc 1 and the address of the part to be reproduced according to the management information. It is held in the buffer RAM 13. Therefore, the buffer RAM
In the area 13, the recording data / playback data buffer area and the area for holding the management information are divided and set.

Then, the system controller 11 reads out these management information by executing a reproducing operation on the innermost circumference side of the disc on which the management information is recorded when the disc 1 is loaded, and stores it in the buffer RAM 13. It is possible to refer to the recording / reproducing operation for the disc 1 thereafter.

The U-TOC is edited and rewritten in response to the recording and erasing of data, but the system controller 11 stores this editing process in the buffer RAM 13 every time the recording / erasing operation is performed. The TOC information is written and the U-TOC area of the disc 1 is rewritten at a predetermined timing according to the rewriting operation.

In the recording / reproducing apparatus having the above structure, the buffer RAM 13 is controlled by the system controller 11 and the memory controller 12 during the recording operation.
Writing / reading operation is performed as shown in FIG.

First, when the recording is started, the input music data is 0.3 Mbit / by the write pointer (write address).
The data is sequentially written in the buffer RAM 13 at the timing of sec (F100). Then, it waits for the data to be accumulated in the buffer RAM 13 for one cluster or more by the writing operation (F102). When the data of 1 cluster or more is accumulated, the data of 1 cluster is read by the read pointer (read address) which is incremented at the timing of 1.41 Mbit / sec, and it is supplied to the recording head and recorded on the disk. (F103).

When a recording stop operation is performed at some point (F10
1) At that time, less than one cluster of data not yet recorded on the disk remains in the buffer RAM 13, but here, n seconds (for example, 2 to 3 seconds) are waited after the recording stop operation. Yes (F104). Then, when n seconds have elapsed, 0-FILL is performed to add "0" data as dummy data to the remaining data less than 1 cluster (F105), and the 0-FILL data is stored in the buffer RAM1.
It supplies to the recording head from 3 and records this on the disc
(F106), the recording operation is completed (F107).

However, if the recording operation is performed again while waiting for n seconds in step F104, the operation from step F100 is executed again, that is, 0-FILL is performed in this case. Instead, the write pointer is continuously incremented from the address at the time of the previous recording stop operation, and data is accumulated. And 1
The data will be recorded on the disc 1 in accordance with the data accumulation for the cluster.

By such processing, even if the recording operation and the recording stop operation are repeated very quickly, the buffer RAM 13 is in the state as shown in FIG. 3 and overflow does not occur. That is, when the recording operation is stopped immediately after the recording operation and the data group D _{1 which} is less than one cluster is taken into the buffer RAM 13 as shown in FIG. 3A, the recording operation is performed immediately after that. The subsequently input data group D ₂ is written at the address following the data group D ₁ as shown in FIG.
That is, 0-FILL is not performed.

After that, assuming that the recording operation and the recording stop operation are repeated very quickly and continuously, for example, as shown in FIG. 3, the data group D input during each recording operation is recorded.
_{1 to} D ₆ are taken into consecutive addresses.
During this period, recording is performed on the disc 1 every time one cluster of data is accumulated. And
For example, if the recording operation is not restarted within n seconds after the _seventh recording and recording stop operation is performed and the data group D ₇ is taken in, 0-FILL is performed as shown in FIG. 3D. Data of one cluster is recorded on the disc.

After that, if the recording operation is started again and the recording operation is continued, the data group D ₈ is accumulated as shown in FIG. 3E, but at this time, the first data group D has already been accumulated. _{Since 1 to} D ₃ are recorded on the disc 1, the data group D ₈ can be continuously taken in at the first address position, and overflow does not occur.

That is, even if the operations of recording and stopping recording are rapidly repeated, 0-FILL is not performed and data is continuously written, so that the buffer RAM 13 is written.
Since there is a considerable time margin until all the capacity is used up and data for one cluster is written to the disk during that time, overflow does not occur. In addition, the continuous operation is temporarily interrupted and at some point 0-
Even if the FILL is performed, there is a time margin for recording the data accumulated so far on the disk 1 during the waiting time of n seconds until the 0-FILL is executed, and in this case also, overflow can be avoided.

In particular, there is a mini disk system in which the TOC data is read from the disk 1 at the start of recording and stored in the buffer RAM 13, and at the same time, the input voice data can be stored in the buffer RAM 13. In this case, since the actual recording of the audio data on the disc 1 can be performed only after the TOC reading is completed, if 0-FILL is performed every time as in the conventional apparatus, it is possible that an overflow easily occurs. When the quick recording operation and the recording stop operation are repeated as in the example, the 0-FILL is not performed, so that there is a sufficient time margin until the capacity of the buffer RAM 13 is used up, and an overflow occurs. Therefore, proper recording operation can be performed.

As described with reference to FIG. 4, the data constituting one cluster is further subdivided into sectors, sound groups, and sound frames. However, the data taken into the buffer RAM 13 at the time of the recording stop operation is in sound group units. If it's not complete, the last sound group will be discarded. This is because one sound group constitutes an L channel and an R channel with two sound frames, and it is meaningless to record only one sound frame on the disc. However, in the case of the monaural system, only one sound frame may be recorded on the disc.

If the sector unit is not completed, "0" data is added as dummy data to the remaining sound group portion in order to complete the last sector, or the sector is not completed. It is possible to discard it. However, even if such sector completion processing is not performed, the data may be captured so that it is continuous even in sound group units when recording is resumed immediately after recording is stopped.

In the embodiment, the recording / reproducing apparatus is taken as an example, but the present invention can also be realized by a recording-dedicated apparatus. Further, the present invention is not limited to the recording device as a so-called mini disk system, and can be realized by a recording device using another kind of disk or tape as a recording medium.

[0047]

As described above, the recording apparatus of the present invention waits a predetermined time (several seconds) until the 0-FILL is executed at the time of the recording stop request, and if the recording operation is restarted before the predetermined time elapses, Since 0-FILL is not performed and the newly supplied recording data is taken into the storage means as data that is continuous with the recording data that is less than the recording data unit, quick recording and recording stop operations are repeatedly performed. However, the storage means will not overflow, and the input data can be properly recorded on the recording medium.
This is more useful because the overflow that is likely to occur is eliminated in a system in which the management information is read from the recording medium at the start of recording and recording cannot be performed on the recording medium during that period.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of buffer RAM control during recording according to the embodiment.

FIG. 3 is an explanatory diagram of a state of a buffer RAM during recording according to the embodiment.

FIG. 4 is an explanatory diagram of a cluster structure of a disc.

FIG. 5 is a flowchart of buffer RAM control during recording in the conventional example.

FIG. 6 is an explanatory diagram of a state of a buffer RAM during recording in the conventional example.

[Explanation of symbols]

 1 Disk 3 Optical Head 8 Encoder / Decoder Unit 11 System Controller 12 Memory Controller 13 Buffer RAM 14 Encoder / Decoder Unit 15 D / A Converter 18 A / D Converter 19 Operation Input Unit 20 Display Unit

Claims (1)

[Claims] 1. At the time of a recording operation, while recording data is taken in and stored in a storage unit, a predetermined minimum recording data amount is read out from the storage unit as a recording data unit, supplied to a recording head, and recorded on a recording medium. In the recording apparatus configured to perform the following, when there is recording data that is less than the recording data unit as recording data accumulated in the storage unit and not recorded in the recording medium at the time of the recording stop request, When a predetermined time has elapsed from the recording stop request, dummy data is added to make the data amount of the recording data unit, and the data is recorded on the recording medium, and when the recording operation is restarted before the predetermined time has elapsed, a new data is newly added. The supplied print data is taken into the storage means as data that is continuous with the print data that is less than the print data unit. Recording apparatus characterized by comprising a control means for performing control.