JPH0644672A - Disk recording device - Google Patents

Abstract

PURPOSE:To obtain a disk recording device which does not delete data recorded in the past and is not required to have large capacity as a buffer memory, even if track jump occurs in recording. CONSTITUTION:This is a such disk recording device that a disk 1 is rotated and tracking control is performed, while address information previously recorded in the disk is reproduced, a recorded position is confirmed based on this address information, and data is recorded. A vibration sensor 110 which detects vibration is provided. When a signal indicating out of track occurs within the prescribed time after vibration is detected by this vibration sensor 110, as it is considered that there is a fear of occurrence of track jump, recording operation is temporarily stopped. A track deviation signal TE obtained from a tracking error signal and a detecting signal for discontinuity of absolute address can be used for an out of tracking signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording device, and more particularly, to a disc recording device even if a track jump occurs during recording.
This is to prevent the recording from being overwritten on the already-recorded portion so as not to be erased.

[0002]

2. Description of the Related Art The applicant of the present invention compresses audio data on a small-sized optical disc having a diameter of 64 mm and intermittently records the audio data at a predetermined amount of data, and intermittently compresses the compressed data from the small-sized disc. A disk recording / reproducing apparatus has been proposed which reads out and temporarily stores in a buffer memory, reads out data from this memory as needed, and expands the data to reproduce the original audio data (for example, Japanese Patent Application No. 2-221725). No.).

At the time of recording data on this disc, the recording track is irradiated with a laser beam having a constant power larger than that at the time of reproduction. Data is recorded on the disk 1 by thermomagnetic recording by this light irradiation and the modulation magnetic field by the magnetic head 4. Since such an optical disk recording / reproducing apparatus is small in size, it can be made compact and a portable apparatus can be realized.

[0004]

By the way, in the case of a portable disk recording / reproducing apparatus, a situation may occur in which the laser scanning position jumps from a normal recording track position due to a track jump due to vibration or the like during recording. There is a risk. If the position jumped by the track jump during recording is the recorded position before the recording, the heat of the laser beam may erase the recorded data at that position. is there.

Therefore, a vibration sensor is provided in the disk recording / reproducing apparatus, and when a vibration is detected, the recording operation is temporarily stopped, and then a correct recording position is searched for again.
It may be possible to start re-recording. In this case, the recorded data corresponding to the time until re-recording is
It needs to be stored in memory. When the recording operation is frequently interrupted, it is necessary to increase the memory capacity accordingly, and it is important to reduce the memory capacity without unnecessary interruption.

By the way, in all cases where the vibration is detected by the vibration sensor, the scanning position of the laser does not always make a track jump. Further, in particular, an optical head provided with a laser light source, when provided in a recording / reproducing apparatus, is provided with a means for allowing the laser to scan the disk stably without being affected by slight vibration. It is normal.
Therefore, if the recording operation is immediately stopped when the vibration is detected, the recording operation may be inadvertently interrupted many times.

Therefore, in the case of the method of immediately stopping the recording operation when the vibration is detected by the vibration sensor, it is necessary to store the data to be recorded when the recording operation is interrupted many times in the memory. Therefore, it is necessary to increase the memory capacity, which causes a cost increase.

In view of the above points, the present invention prevents the data recorded in the past from being inadvertently erased due to a track jump at the time of recording, and increases the capacity of the buffer memory for recording data. An object is to provide a disk recording device that can be minimized.

[0009]

In order to solve the above problems, a disk recording apparatus according to the present invention rotates a disk 1, detects a tracking error from data recorded on the disk 1, and performs tracking control. A disc recording device for recording data on the disc, wherein a vibration sensor 110 for detecting vibration is provided, and the tracking error is predetermined within a predetermined time after the vibration sensor 110 detects the vibration. It is characterized in that the detection means 100 for detecting that the value is equal to or more than the value is provided, and the recording operation is temporarily stopped by the detection output of the detection means.

Further, a vibration sensor 110 for detecting vibration is provided, and after the vibration is detected by this vibration sensor,
The detection means 100 for detecting that the reproduced address information is not accurate is provided, and by the detection output of this detection means,
The recording operation may be temporarily stopped.

[0011]

According to the present invention having the above-described structure, not only the vibration detection output of the vibration sensor but also the possibility that an actual track jump has occurred as a result of this vibration is detected. One of the detection methods of the latter person is a method of detecting by a tracking error. The other method is a method of detecting when the address information recorded in the disc in advance becomes discontinuous, such as when the address information is discontinuous.

Since the recording operation is temporarily stopped only when the actual tracking jump occurs, the recording operation can be stopped to the minimum necessary and the memory capacity can be small.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the present invention in which audio data is compressed and recorded on a disc smaller than the above-mentioned CD.
This is an embodiment in the case of being applied to a disc recording / reproducing apparatus which expands data at the time of reproduction and reproduces original audio data.

In FIG. 1, reference numeral 1 is an optical disk. The outer diameter of the disc 1 in this example is 64 mm.
, Recording tracks are formed in a spiral shape at a pitch of 1.6 μm, for example. The disk 1 is rotationally driven by the spindle motor 3 and is controlled by the servo circuit 80 so as to rotate at a constant linear velocity, for example, 1.2 to 1.4 m / s. Then, by recording the audio information as a digital signal and compressing and recording it on the disc 1, 130 M bytes or more of the target information can be recorded and reproduced. In the case of this example, the disk 1 is a rewritable magneto-optical disk having a magneto-optical recording film and capable of recording / reproducing and erasing.

Further, a pregroove for optical spot control (for tracking control) is formed in advance on the disc 1. Especially, in the case of this example, a wobbling signal for tracking is added to this pregroove. The absolute address code is recorded in a superimposed manner. The disc 1 is housed in a disc cartridge 2 to prevent dust and scratches.

[Recording System of Recording / Reproducing Apparatus] The embodiment of the recording / reproducing apparatus of FIG. 1 is devised so that the structure can be simplified as much as possible by using an IC. First, the time of recording on a magneto-optical disk will be described. It should be noted that, at the time of recording and at the time of reproduction, the mode of each circuit unit is switched by a mode switching signal from a system controller 100 configured by using a microcomputer.

The analog audio signals of the left and right channels, for example, through the input terminal 6 are supplied to the A / D converter 1
0, for example, a sampling frequency of 44.1 kHz
Are sampled, and each sampled value is converted into a 16-bit digital signal. The 16-bit digital signal is supplied to the data compression / expansion processing circuit 20.
The data compression / expansion processing circuit 20 functions as a data compression circuit during recording and functions as a data expansion circuit during reproduction. This processing circuit 20 for data compression and decompression
Includes a buffer memory (not shown).

In this example, the data compression / expansion processing circuit 20 compresses the input digital data to, for example, about 1/5. Various data compression methods can be used. For example, an ADPCM (Adaptive Delta Pulse Code Modulat) with a quantization number of 4 bits is used.
ion) can be used. In addition, for example, the input digital data is divided into a plurality of bands so that the higher the band is, the wider the band becomes, and a plurality of samples (the number of samples should be the same in each band) for each of the divided bands. It is also possible to use a method in which the blocks are formed, orthogonal transformation is performed for each block in each band, coefficient data is obtained, and bits are assigned to each block based on this coefficient data. The data compression method in this case considers the human auditory perception characteristics to sound, and can perform data compression with high efficiency (see Japanese Patent Application No. 1-278207).

In this way, the digital data DA from the A / D converter 10 is compressed to 1/5 by the data compression processing in the data compression / expansion processing circuit 20, and the data compressed data da is stored in the memory controller 30.
Is transferred to the buffer memory 31 controlled by. In the case of this example, the buffer memory 31 is a DRAM having a capacity of 1M to 4M bits.

The memory controller 30 outputs a predetermined amount of compressed data da from the buffer memory 31 at an intermittent recording timing unless a track jump in which the recording position on the disk 1 jumps due to vibration or the like during recording. The data is read at a transfer speed that is about 5 times the write speed, and the read data is transferred to the ECC and modulation / demodulation processing circuit 40.

Further, in this case, the memory controller 30
During this recording, during normal operation, memory control is performed so that the data stored in the buffer memory 31 is reduced as much as possible. For example, when the amount of data in the buffer memory 31 exceeds a predetermined amount, a predetermined amount of data, for example, 32 sectors (1 sector is 1 CD-R
Only the data of the OM sector (about 2 Kbytes) is read from the buffer memory 31, and the memory control is performed so as to always secure the write space of a predetermined data amount or more. Data including audio data for 32 sectors will be referred to as a cluster hereinafter.

The ECC / modulation / demodulation processing circuit 40 functionally includes a data encoding / decoding circuit 41, a recording encoding circuit 42, and a reproduction decoding circuit 43. The data encoding / decoding circuit 41 of the ECC / modulation / demodulation processing circuit 40 functions as an encoding circuit at the time of recording and encodes the compressed data da transferred from the buffer memory 31 into the data of the sector structure of the CD-ROM.

This data encoding / decoding circuit 41
Output data (data in cluster units) is supplied to the recording encoding circuit 42. This recording encoding circuit 4
In 2, the data is subjected to error detection / correction encoding processing, and is also subjected to modulation processing suitable for recording, in this example, EFM encoding processing. As the code for error detection and correction, CIRC (Cross Interleave Reed-Solomon code) is used in this example, but since the recorded data is intermittent data in cluster units, the beginning and the end of the intermittent data are An improved CIRC encoding process is performed in which a predetermined amount of dummy data is added.

The encoded data from the recording encoding circuit 42 is supplied to the magnetic head 4 via the magnetic head drive circuit 50. Magnetic head drive circuit 5
0 drives the magnetic head so that the modulation magnetic field according to the recording data is applied to the disk 1 (magneto-optical disk).
The recording data supplied to the head is in cluster units, and recording is intermittently performed in cluster units.

The disk 1 is housed in the cartridge 2, but when it is loaded into the apparatus, the shutter plate is opened and the disk 1 is exposed from the shutter opening. Then, the rotation shaft of the disk driving spindle motor 3 is inserted and connected to the spindle insertion opening, and the disk 1 is rotationally driven. In this case, the spindle motor 3 is controlled by the servo control circuit 80 to rotate the disk 1 at a linear velocity of 1.2 to 1.4 m / s.

The magnetic head 4 faces the disk 1 exposed from the shutter opening of the cartridge 2. An optical head 5 is provided at a position facing the surface of the disk 1 opposite to the surface facing the magnetic head. The optical head 5 includes, for example, a laser light source such as a laser diode, a collimator lens, an objective lens, a polarization beam splitter, an optical component such as a cylindrical lens, and a photodetector.

The output power of the laser light source of the optical head 5 is controlled by the optical power control circuit 90. The optical power control circuit 90 receives the laser power control signal LPCT from the system controller 100 and controls the laser power. Then, at the time of recording, the laser scanning track position is irradiated with laser light having a constant power larger than that at the time of reproduction. By this light irradiation and the modulation magnetic field by the magnetic head 4, the disk 1
Data is recorded on the disk by thermomagnetic recording. And
Both the magnetic head 4 and the optical head 5 are configured to be movable in the radial direction of the disk 1.

At the time of this recording, the output of the optical head 5 is supplied to the RF circuit 60. The RF circuit 60 extracts the focus error signal and the tracking error signal from the output of the optical head 5 from the pre-groove and supplies them to the servo control circuit 80. The servo control circuit 80 controls the focus of the optical system of the optical head 5 so that the focus error signal becomes zero, and controls the tracking of the optical system of the optical head 5 so that the tracking error signal becomes zero. To do.

In this case, when the tracking error signal exceeds a predetermined value and the scanning position of the laser light from the optical head 5 becomes a value that may cause track jump from the correct position, the servo control circuit 80 Is
The track shift signal TE indicating that is supplied to the system control 100.

The RF circuit 60 also extracts the absolute address code from the pre-groove and supplies it to the absolute address decoder 70. Then, the absolute address information from the decoder 70 is supplied to the system controller 100. As described above, this absolute address information is used for recognizing the recording position and controlling the position of the optical head 5 in the disk radial direction by the servo control circuit 80. Further, the decoded absolute address information is supplied to the recording encoding circuit 42, inserted into the recording data as absolute address information, and recorded on the disc.

Further, a signal from the RF circuit 60 is supplied to the servo control circuit 80, a control signal for constant linear velocity servo of the motor 3 is formed from a signal from the pre-groove of the disk 1, and the motor 3 is speed controlled. To be done.

[Explanation of Track Jump Detection and Re-Recording Operation] The above is the normal operation when no track jump occurs during recording. When it is detected that a track jump may occur during recording, the data transfer from the buffer memory 31 to the processing circuit 40 is stopped, and the compressed data da from the processing circuit 20 is transferred to the buffer memory 31.
Accumulate in. Then, the optical power control circuit 90 reduces the laser power of the optical head 5 to a value at which previously recorded data is not erased, for example, a value at the time of reproduction.
However, if no signal readout is needed,
The laser power may be zero.

Then, when the recording position is corrected to the correct position using the absolute address data, the data transfer from the buffer memory 31 to the circuit 40 is restarted, and the laser power is returned to the size at the time of recording. The laser power control circuit 90 is controlled as described above. In the data transfer in this case, even if the recording interruption is in the middle of recording the intermittent compressed data of one cluster unit at the previous time, the recording is all performed again from the beginning of the data of this one cluster.

In the apparatus of this example, the current recording / scanning track position is always known from the absolute address. However, this absolute address can only be obtained at 1/75 second intervals in this example. In consideration of scratches on the disc, the unreadable up to three absolute addresses are allowed. This means that for 4/74 seconds,
This means that the recording operation is continued even if the absolute address cannot be obtained. Therefore, if there is a track jump during this period, the previously recorded data may be erased. In order to prevent this, it is important to detect the danger of a track jump as soon as possible by using some information other than the absolute address.

In this example, the detection of whether or not the risk of a track jump has occurred is performed as follows in consideration of the above points. In this example, the vibration sensor 110 is provided at a position in the device where vibration can be detected as easily as possible. Then, the vibration detection output QK of the vibration sensor 110 is supplied to the system controller 100. Further, as described above, the track deviation signal from the servo control circuit 80
TE is supplied to the system controller 100. Further, the absolute address data from the absolute address decoder 70 is supplied to the system controller 100.

The optical head 5 is capable of withstanding a slight vibration.
It is usually attached to the equipment with a seismic structure so that it is not affected. Therefore, even if there is vibration and the vibration sensor 110 detects it, the track shift may not occur. Further, the track deviation resulting from the vibration usually occurs slightly later than the vibration detection output of the vibration sensor 110. This delay time is generally 2
It is within 0 msec. The time difference from the vibration to the occurrence of the track deviation varies depending on the mechanical error, the servo constant, etc., and is set for each device.

In this example, the system controller 100
Then, the vibration detection output QK from the vibration sensor 110 (FIG. 2A)
When is input, based on this, for example, a width of 20 mse
Form the window WD of c (FIG. 2B). Then, it is detected whether or not the track shift signal TE (FIG. 2C) is generated within the width of the window WD. When the track deviation signal TE is generated within the width of the window WD, the system controller 10 outputs the detection signal DET (FIG. 2D), which indicates that the risk of track jump is high.
0 occurs, and the recording operation is suspended.

That is, the system controller 100
Is controlled by the laser power control signal LPCT (FIG. 4E) formed based on this detection signal DET.
0 is controlled to reduce the laser power at the time of the detection signal DET. Further, the detection signal DET stops the transfer of data from the processing circuit 40 to the magnetic head drive circuit 50, and the buffer memory 31 causes the processing circuit 4 to move.
Stop data transfer to 0.

The system controller 100 also includes
At this time, since the absolute address data is input, it is possible to detect the occurrence of the track jump due to the discontinuity of the absolute addresses. When a track jump due to the discontinuity of the absolute address is detected after the vibration detection output QK is generated and before the track deviation signal TE is generated within the time width of the window WD, the absolute address error is detected. The detection signal DET is generated at the time of continuous detection. Then, the optical power is reduced and the recording operation is temporarily stopped in the same manner as described above.

The vibration detection output QK of the vibration sensor 110
And the tracking deviation signal TE may be used to generate the detection output DET of the risk of a track jump, or the vibration sensor 110QK and the detection output of a discontinuity of absolute addresses may cause a risk of a track jump. Detection output DE
You may make it generate | occur | produce T.

The unit data whose recording is incomplete due to the temporary stop of recording, that is, the compressed data in cluster units, is stored in the buffer memory 31 or the internal memory (not shown) of the processing circuit 40 until the recording of the data is completed. Since it has been stored, it will be used to re-record all the data in that unit.

An example of this re-recording method will be described with reference to FIG. As shown in FIG. 3A, the data for one cluster is obtained by compressing audio data for about 2 seconds, and it takes 0.48 seconds to record the data for the one cluster.
Therefore, if a track jump does not occur, cluster-unit data is sequentially recorded at an intermittent timing of 0.48 seconds every 2 seconds.

Now, as shown in FIG. 3B, when the vibration is generated during the recording of the first cluster data in FIG. 3A and the vibration detection output QK is obtained from the vibration sensor 110, in the system controller 100, When the track deviation signal TE or the absolute address discontinuity occurs within the window WD width, as shown in FIG. 3C, the track deviation signal TE
The detection signal DET is obtained at the time of occurrence of TE or detection of absolute address discontinuity, whichever is earlier. Then,
As mentioned above, laser power control signal LPCT (Fig. 3D)
Laser power is reduced to zero or
Further, the data transfer is stopped and the recording operation is temporarily stopped. Therefore, the recording of the first cluster data in FIG. 3A ends incompletely.

This incompletely recorded cluster data is re-recorded in cluster units as shown in FIG. 3E.
That is, after generation of the detection output DET, after it is confirmed by the vibration sensor 110 that the vibration has disappeared, the system controller 100 refers to the absolute address from the absolute address decoder 70 with the laser power being lowered, and is correct. Seek to the recording position. Then, when the correct recording track position is detected, the laser power is returned to the value at the time of recording by the control signal LPCT to the laser power control circuit 90, and the transfer of the cluster data to the magnetic head drive circuit 50 is started. Re-record as shown in 3E.

This re-recording can be performed in about 1 second, as the seek time is about 0.5 seconds and normal vibrations are within 0.5 seconds, as shown in FIG. 3E. To
It can be completed within 2 seconds which is a recording interval of data of 1 cluster.

However, when the vibration continues for a long time, for example, over 2 seconds, there is no time to re-record.
In this way, when the vibration continues for a relatively long time, by increasing the memory capacity and re-recording the data of a plurality of clusters in a number according to the duration, Can be recorded without omission. That is, for example, as shown in FIGS. 4A and 4B, when the vibration lasts longer than 2 seconds, the recording of the first cluster data is discontinuous and the recording of the next cluster data cannot be performed. At this time, these data are stored in the memory 31, and as shown in FIG. 4A, the system controller 100 seeks the correct recording track position after the vibration is stopped, and recording is not performed from that recording position. The continuous cluster data and the next unrecordable custaster data are continuously read from the memory and recorded. After the recording after the track jump is completed, the normal recording state of the data of one cluster unit is restored.

Even if the vibration sensor 110 does not detect vibration, a track jump may occur due to a scratch or the like. The actual occurrence of track jump can be confirmed from the discontinuity of absolute addresses,
The vibration detection output QK of the vibration sensor 110 makes it possible to determine whether the track jump is caused by vibration or the track jump is caused by scratches.

In the case of a track jump caused by vibration, re-recording can be performed as described above. However, in the case of a track jump caused by a scratch, even if the track is returned to the correct track position by seeking, the track jump is performed again. There is a possibility that In this case, referring to the vibration detection output QK of the vibration sensor 110, it can be seen that the track jump is caused by a scratch, so that recording at that position can be stopped.

In the case of a track jump due to this scratch, the vibration sensor 110 cannot be obtained. Therefore, after the track deviation signal TE is generated, the recording position is correct by the position confirmation by the first absolute address every 1/75 seconds. When it is determined that there is no (absolute address discontinuity), the laser power is reduced or reduced to zero, and the recording operation is temporarily stopped.

As will be understood from the above, the data capacity of the buffer memory 31 in the case of this example is the compression corresponding to the time from the occurrence of the track jump to the correct correction of the recording position. The minimum capacity that can store the data da is required. In this example, the buffer memory 31 has a capacity of 1M to 4M bits as described above, and this capacity is selected to have a margin to sufficiently satisfy the above conditions.

[Reproduction System of Recording / Reproduction Device] The disk loaded in the device is rotationally driven by the spindle motor 3. Then, in the same manner as during recording, the motor 3 is driven by the servo control circuit 80 in response to a signal from the pre-groove so that the disc 1 has the same speed as that during recording, that is, a linear velocity of 1.2 to 1.4 m / s. The rotation speed is controlled to be constant. During this playback, the system controller 10
In response to the control from 0, the optical power control circuit 90 sets the laser power of the optical head 5 to a predetermined low value for reproduction.

At the time of reproduction, the optical head 5 detects a focus error by, for example, an astigmatism method by detecting the reflected light of the laser beam applied to the target track, and
For example, in the case of a read-only type optical disc, a tracking error is detected by the push-pull method, and a reproduction signal is detected by utilizing the diffraction phenomenon of light in the pit row of the target track. Detects the reproduction signal by detecting the difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track.

The reproduction of the reproduction data from the disk 1 by the optical head 5 is performed by a fixed amount under the control of the system controller 100, and in this example, intermittently in cluster units.

The output of the optical head 5 is supplied to the RF circuit 60. The RF circuit 60 extracts a focus error signal or a tracking error signal from the output of the optical head 5 and supplies the focus error signal or the tracking error signal to the servo control circuit 80.
The value is converted and supplied to the reproduction decoding circuit 43 of the processing circuit 40.

The servo control circuit 80 controls the focus of the optical system of the optical head 5 so that the focus error signal becomes zero, and also controls the optical system of the optical head 5 so that the tracking error signal becomes zero. Performs tracking control.

The RF circuit 60 also extracts the absolute address code from the pre-probe and supplies it to the absolute address decoding circuit 70. Then, the absolute address information from the decoding circuit 70 is supplied to the system controller 100, and is used for the servo control circuit 80 to control the reproducing position of the optical head 5 in the disk radial direction. The system controller 100 can also use the address information in sector units extracted from the reproduction data to manage the position on the recording track scanned by the optical head 5.

During this reproduction, as will be described later, the disc 1
The compressed data read from is written in the buffer memory 31, read and expanded, but due to the difference in the transmission rate of both data, the timing of intermittent data reading by the optical head 5 from the disk 1 is For example, while being monitored by the memory controller 30 so that the amount of data stored in the buffer memory 31 does not fall below a predetermined amount, the system controller 100 controls the data.

The reproduction decoding circuit 43 of the processing circuit 40 is
Upon receiving the binarized reproduction signal from the RF circuit 60, processing corresponding to the recording / encoding circuit 42, that is, EFM decoding processing, decoding processing for error detection and correction, interpolation processing, and the like are performed. The output data of the reproducing / decoding circuit 43 is supplied to the data encoding / decoding circuit 41.

The data encode / decode circuit 41 includes
It functions as a decoding circuit during reproduction, and decodes the data of the CD-ROM sector structure into compressed data. The output data of the data encoding / decoding circuit 41 is transferred to the buffer memory 31 controlled by the memory controller 30 and written at a predetermined writing speed. The clock for this writing is supplied from the processing circuit 40 side to the memory controller 30.

At the time of this reproduction, if there is no track jump in which the reproduction position jumps due to vibration or the like during reproduction, the memory controller 30 supplies the data from the data compression / expansion processing circuit 20 side. Based on the data read request signal, the data in the compressed state from the data encoding / decoding circuit 41 is sequentially read from the buffer memory 31 at a transfer speed that is about ⅕ the writing speed, and the read data is compressed. /
The data is transferred to the expansion processing circuit 20. In this case, as described above, the memory controller 30 controls the writing / reading of the buffer memory 31 so that the amount of data stored in the buffer memory 31 does not fall below a predetermined value.

When it is detected that a track jump has occurred during reproduction, the system controller 100
Stops writing data from the circuit 40 to the buffer memory 31 and only transfers data to the data compression / expansion processing circuit 20. Then, when the reproduction position is corrected, control is performed so as to restart the data writing from the circuit 40 to the buffer memory 31.

Whether or not a track jump has occurred is detected by the method using the vibration sensor 110 and the track shift signal TE, and recording is performed by superimposing the wobbling signal for tracking control on the pre-groove of the optical disk, as in the recording. It is possible to use the method of using the absolute address code that has been used (that is, the method of using the decode output of the absolute address decoder 70). Further, at the time of this reproduction, as described above, the absolute address information and the sector-unit address information are extracted from the reproduction data, which can be used.

As will be understood from the above, the data capacity of the buffer memory 31 at the time of reproduction corresponds to the time from the occurrence of the track jump to the correct correction of the reproduction position. The minimum capacity that can always store data is required. This is because with such a capacity, data can be continuously transferred from the buffer memory 31 to the data compression / expansion processing circuit 20 even if a track jump occurs. 1M to 4M bits as the capacity of the buffer memory 31 in this example is selected as a capacity having a margin so as to sufficiently satisfy the above condition.

As described above, the memory controller 30 controls the memory so that the buffer memory 31 stores as much predetermined data as the minimum required amount during normal operation. In this case, for example, when the amount of data in the buffer memory 31 becomes equal to or less than a predetermined amount, a data read request is issued to the system controller 100, and the optical head 5 intermittently takes in data from the disk 1. The data is written from the circuit 40, and the memory is controlled so as to always secure a read space of a predetermined data amount or more.

The data compression / expansion processing circuit 20 functions as a data expansion circuit at the time of reproduction, takes in the ADPCM data from the buffer memory 31 into the buffer memory (not shown), and reverses the data compression processing at the time of recording. It is processed and stretched about 5 times.

The digital audio data from the data compression / expansion processing circuit 20 is supplied to the D / A converter 11, converted into a 2-channel analog audio signal, and output from the output terminal 7. In this example,
The digital audio data before D / A conversion can be output from the output terminal 8 as it is.

[0067]

As described above, according to the disk recording apparatus of the present invention, not only the vibration detection output of the vibration sensor but also the track deviation signal obtained from the tracking error and the discontinuity of the absolute address from the pre-groove are obtained. Is detected and the risk of causing a track jump is detected, so that the minimum number of temporary recording stops is required. Therefore, the capacity of the data buffer memory can be minimized, which also contributes to cost reduction.

Further, according to the present invention, the data in which the recording is interrupted is re-recorded from the beginning by utilizing the vacant time of the intermittent recording, so that the data can be surely re-recorded without being lost. .

[Brief description of drawings]

FIG. 1 is a block diagram of a disk recording / reproducing apparatus to which an embodiment of the present invention is applied.

FIG. 2 is a timing chart for explaining an essential part of the present invention.

FIG. 3 is a timing chart for explaining an example of data re-recording according to the present invention.

FIG. 4 is a timing chart for explaining another example of data re-recording according to the present invention.

[Explanation of symbols]

 1 disk 2 disk cartridge 3 spindle motor 5 optical head 11 D / A converter 20 data compression / expansion processing circuit 30 memory controller 31 buffer memory 40 ECC and modulation / demodulation processing circuit 50 magnetic head drive circuit 60 RF circuit 70 absolute address decoding circuit 80 servo circuit 90 optical power control circuit 100 system controller 110 vibration sensor

Claims (4)

[Claims] 1. A disk recording apparatus for rotating a disk, detecting a tracking error from the data recorded on the disk, and recording the data on the disk while performing tracking control. A vibration sensor for detecting vibration. And a detection means for detecting that the tracking error becomes a predetermined value or more within a predetermined time after the vibration is detected by the vibration sensor, and the recording operation is performed by the detection output of the detection means. A disk recording device that is temporarily stopped. 2. A disc for rotating a disc for tracking control, reproducing address information recorded in advance on the disc, and confirming a recording position based on the address information to record data. In the recording apparatus, a vibration sensor for detecting vibration is provided, and a detection unit for detecting that the reproduced address information is not accurate after the vibration is detected by the vibration sensor is provided. , A disk recording device for temporarily stopping the recording operation. 3. A disc is rotated, a tracking error is detected from the data recorded on the disc, tracking control is performed, and address information previously recorded on the disc is reproduced, and based on this address information. A disk recording device for confirming a recording position and intermittently recording compressed data at a predetermined amount. A vibration sensor for detecting vibration is provided and vibration is detected by this vibration sensor. A detection means for detecting that the tracking error signal has exceeded a predetermined value is provided within a predetermined time thereafter, and the recording operation is temporarily stopped by the detection output of this detection means, and recording is performed at the correct recording position. When restarting the operation, the disk is designed to re-record all the predetermined amount of recording data when the recording operation is temporarily interrupted. Recording device. 4. A disc is rotated, a tracking error is detected from the data recorded on the disc, tracking control is performed, and address information previously recorded on the disc is reproduced, and based on this address information. A disk recording device for confirming a recording position and intermittently recording compressed data at a predetermined amount. A vibration sensor for detecting vibration is provided and vibration is detected by this vibration sensor. After that, a detecting means for detecting that the reproduced address information is not accurate is provided, and the recording operation is temporarily stopped by the detection output of the detecting means, and at the time of restarting the recording operation at the correct recording position, A disk recording apparatus for re-recording a predetermined amount of recording data when the recording operation is temporarily interrupted.