JPH0554383A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable satisfactory recording even when a tracking abnormality is generated by restarting the recording in the case when absolute address data before and after stopping the recording due to a tracking abnormality is coincident and the difference between write and read addresses is more than the prescribed value. CONSTITUTION:A tracking abnormality command generation means 13 discriminates the continuity of absolute address reading data 117 at the time of recording to output a tracking abnormality command 119. A recording command generation means 7 receives this, stopping the recording by a recording command 106. The recording is restarted in the case when absolute address storage data 118 before stopping recording and absolute address reading data 117 after stopping recording are coincident and the difference between a write address 104 and a read address 105 are more than the prescribed comparison value. Thus, the recording on a disk 6 can be satisfactorily performed with a constant pencil of lines independent on I/O data rate even when a tracking abnormality is generated in an optical pickup due to the external disturbance such as vibration or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus for recording / reproducing information such as sound on a disc.

[0002]

2. Description of the Related Art In recent years, compact discs in which audio signals are converted into digital signals and recorded on the discs have become very popular. Further, technical announcements have been actively made regarding a disk recorder that records and reproduces digital signals using a disk, and some of them have been commercialized.

On the other hand, the bit rate of an audio signal after digitization is not uniquely determined, and when signals digitized at various sampling frequencies and quantization bit numbers are recorded on the same medium, it depends on the input bit rate. Therefore, there is a demand for an apparatus capable of recording and reproducing at a constant linear velocity and without wasteful empty areas.

A technique for solving this problem is disclosed in, for example, Japanese Patent Application No. 2-305117 already filed by the present applicant. According to this conventional technique, input data is temporarily taken into the memory, the data capacity in the memory is detected by the difference between the write address and the read address, and when the data capacity in the memory is equal to or more than a predetermined comparison value, the recording mode is set. , When the data capacity in the memory is less than or equal to the predetermined comparison value, the still mode is set by the track jump,
It is possible to record on a disc at a constant linear velocity and with no unnecessary empty area even for input signals of all data rates.

[0005]

However, in the above-mentioned conventional configuration, the recording operation is determined only by the data capacity in the memory and a predetermined comparison value, so that the optical pickup is tracked by disturbance such as vibration during the recording operation. When an abnormality occurs, for example, a track jump or the like is caused, the subsequent recording operation may not be performed well, and therefore, there is a problem that the recording is repeated or the recorded data is lost. ..

The present invention solves the above-mentioned conventional problems. Even when a tracking abnormality occurs during recording or reproducing operation due to disturbance such as vibration, recording and reproducing at a constant linear velocity regardless of the input / output data rate. It is an object of the present invention to provide a disc recording / reproducing apparatus capable of satisfactorily performing the above.

[0007]

To achieve this object, a disk recording apparatus of the present invention uses an optical pickup to perform recording on a track of a disk-shaped recording medium to which an absolute address is previously given, and Absolute address reading means for reading an absolute address, absolute address storage means for temporarily storing the absolute address read by the absolute address reading means, memory means for storing digitally encoded input data, and write address of the memory means Write address generating means, a read address generating means for generating a read address of the memory means according to a given recording command, and a difference between the write address and the read address is detected, and the difference is a predetermined comparison value or more. In the case of Command generating means, recording means for recording a signal read from the memory means on the disc in accordance with the recording command; and the optical pickup on-track on the track during recording operation, and based on the recording command. Tracking control means for causing the optical pickup to make a track jump and accessing the optical pickup to a desired track according to a given access command; and tracking abnormality command generation means for detecting a tracking abnormality of the optical pickup and outputting a tracking abnormality command. When the tracking abnormality command is given, the access command generating means outputs an access command to access the desired track to the optical pickup.

Further, the disk reproducing apparatus of the present invention uses an optical pickup to reproduce a digital signal recorded on a track of a disk-shaped recording medium to which an absolute address is previously given, and reads the absolute address. Means, an absolute address storage means for temporarily storing an absolute address read by the absolute address reading means, a reproducing means for demodulating an output signal from the optical pickup, and a reproduction signal demodulated by the reproducing means. A memory means for storing the write address, a write address generating means for generating a write address of the memory means according to a given reproduction command, a read address generating means for generating a read address of the memory means, and the write address and the read address. Detect the difference, Difference is less than or equal to a predetermined comparison value, reproduction command generating means for outputting the reproduction command, and the optical pickup is on-track on the track during the reproduction operation, and the optical pickup is tracked based on the reproduction command. Tracking control means for causing the optical pickup to jump to a desired track in accordance with a given access command, tracking abnormality command generating means for detecting a tracking abnormality of the optical pickup and outputting a tracking abnormality command, and the tracking abnormality command Is provided, an access command generating means for outputting an access command to access the desired track to the optical pickup is provided.

The disc recording and reproducing apparatus of the present invention has a structure of a tracking error generating means for generating a tracking error signal from the output of the optical pickup.

[0010]

According to the present invention, the tracking abnormality command generating means outputs the tracking abnormality command by discriminating the continuity of the absolute address read by the absolute address reading means, and the recording command generating means has the tracking abnormality command. When is input, the recording is stopped by the recording command, the absolute address before the recording stop temporarily stored by the absolute address storage means and the absolute address after the recording stop read by the absolute address reading means match, and the write address By restarting recording when the read address difference is greater than or equal to the specified comparison value, even if tracking error occurs in the optical pickup during recording operation due to disturbance such as vibration, a constant linear velocity is achieved regardless of the input / output data rate. And good recording on the disc with no wasted free area It can be.

Further, according to the present invention having the above-mentioned structure, the tracking abnormality command generating means determines the continuity of the absolute addresses read by the absolute address reading means and outputs the tracking abnormality command, and the reproduction command generating means causes the tracking abnormality command. When a command is input, the reproduction is stopped by the reproduction command, and the absolute address before the reproduction is stopped which is temporarily stored by the absolute address storage means and the absolute address after the reproduction is stopped which is read by the absolute address reading means are coincident with each other and the write address. When the difference between the read address and the read address is less than or equal to the specified comparison value, playback is restarted, so that even if tracking error occurs in the optical pickup during playback due to disturbance such as vibration, the data of the signal recorded on the disc It is possible to favorably reproduce at a constant linear velocity regardless of the rate.

Further, according to the present invention having the above-mentioned structure, the tracking abnormality command generating means determines whether the tracking error signal generated by the tracking error generating means is large or small and outputs the tracking abnormality command, so that a disturbance such as a vibration is generated. Even if a tracking abnormality occurs during the recording or reproducing operation, recording and reproducing can be favorably performed at a constant linear velocity regardless of the input / output data rate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a disk recording apparatus according to the first embodiment of the present invention, FIG. 2 is a block diagram of a tracking abnormality command generating means in the first embodiment, and FIG.
6 is a block diagram of the recording command generating means in the first embodiment, FIG. 4 is a block diagram of the access command generating means in the first embodiment, FIG. 5 is a track pattern diagram recorded by the disk recording apparatus of the first embodiment, and FIG. FIG. 4 is a waveform diagram of each part in the disk recording apparatus of the first embodiment.

In this embodiment, as shown in FIG. 5, a case will be described in which recording is performed from the inner circumference toward the outer circumference in a spiral continuous track formed on a disk. The data rate that can be recorded on the disc must be higher than the input / output data rate.

In FIG. 1, digitally encoded input data 101 is a write address 104 generated by a write address generating means 2 at an input data rate.
Is read out from the memory means 1 according to the read address 105 generated at the recording data rate by the read address generation means 3. Memory output 102 read from the memory means 1
Is input to the recording means 4 and is further output by the recording means 4 as the laser drive signal 103 of the optical pickup 5 to record on the disc 6. Optical pickup 5
The tracking control output 107 from the tracking control unit 8 controls the tracking during recording.

An absolute address is given in advance to the disk 6, and the absolute address reading means 11 reproduces the absolute address reproduction data 1 reproduced from the optical pickup 5.
After 16 is amplified and demodulated, it is output as absolute address read data 117. Also, the absolute address storage means 12
Stores the absolute address read data 117 before recording is stopped according to the recording command 106.

The tracking abnormality command generating means 13 detects the tracking abnormality during the recording operation by judging the continuity of the absolute address read data 117, and outputs the tracking abnormality command 119. FIG. 2 shows a configuration example of the tracking abnormality command generating means 13. In FIG.
The absolute address read data 117 is delayed by one address by the delay unit 24, added by one address by the adder 25, and input to the address abnormality discriminator 26 together with the output 121. The absolute address read data 117 during the recording operation monotonically increases and coincides with the output 121 of the adder 25. The address abnormality discriminator 26 detects the coincidence between the absolute address read data 117 and the output 121 of the adder 25 during the recording operation, that is, when the recording command 106 is at the “H” level, and if they do not coincide, a tracking abnormality occurs. Then, the tracking abnormality command 119 of "H" pulse is output.

Next, an example of the structure of the recording command generating means 7 is shown in FIG.
Shown in. In FIG. 3, the difference between the write address 104 and the read address 105 is calculated by the subtractor 21, and then the comparator 22 compares the difference between the write address 104 and the read address 105. The output 110 of the comparator 22 is input to the synchronization circuit 23, is synchronized by the synchronization clock 111 which is output once for one rotation of the disk 6, and then can be recorded at the “H” level, and at the “L” level. A recordable command 122 that indicates that recording is impossible is output. Further, the absolute address read data 117 and the absolute address storage data 118 before the recording stop stored in the absolute address storage means 12 are input to the coincidence detector 27. The coincidence detector 27 detects the coincidence of both data, and outputs a "H" pulse, for example, when they coincide. The output 123 of the coincidence detector 27 is input to the abnormal stop command generating means 28 together with the tracking abnormal command 119 generated by the tracking abnormal command generating means 13 and the output 110 of the comparator 22. The abnormal stop command generation means 28 uses the tracking error command 119 “H”.
Immediately when a pulse is input, an abnormal stop of the recording operation is instructed, and the coincidence detector 27 detects the coincidence of the absolute address storage data 118 before the abnormal stop and the absolute address read data 117 after the abnormal stop, and the comparator. When it is determined by 22 that the difference between the write address 104 and the read address 105 is not less than the comparison value 109, the abnormal stop command 124 for canceling the abnormal stop of the recording operation and instructing the recording restart is output. The abnormal stop command 124 in this embodiment is
It is assumed that the recording operation is performed at the “H” level and the recording is stopped at the “L” level. Recordable command 122 and abnormal stop command 12
3 is input to the record discriminator 29. The record discriminator 29 is
Both recordable command 122 and abnormal stop command 123 are "H"
If the level is the recording operation, the recording command 106 for prohibiting the recording is output if either one is the "L" level. In the recording command 106 in this embodiment, the recording operation is performed at the “H” level and the recording is prohibited at the “L” level.

Now, the relationship between the setting of the comparison value 109 and the capacity of the memory means 1 will be described. Basically, the capacity of the memory means 1 should be such that the amount of data that can be recorded in the next one revolution of the disk is secured. Therefore, the comparison value 109 is: Dd: amount of recording data written to the disk 6 during the next one rotation of the disk Di: amount of input data written to the memory means 1 during the next one rotation of the disk Dm: current memory means 1 If the stored data capacity R: comparison value 109 is set, R = Dd may be set. In this case, since the recording command 106 is synchronized by the synchronization clock 111 which is output once per one rotation of the disc, a jump operation is performed when Dm is slightly smaller than R, and Di is input during the one rotation. Since the data 101 is written in the memory means 1, the maximum required memory capacity is Dd + Di. On the other hand, since the input data 101 is actually written in the memory means 1 even during data recording on the disc, the comparison value 109 can be set to R = Dd-Di.
The maximum value of the capacity of the memory means 1 in this case is R + Di =
Dd-Di + Di = Dd. However, the track jump of the optical pickup 5 which occurs due to the tracking abnormality during the recording operation is not always canceled by one rotation of the disk and may require several rotations. In that case, the recording operation on the disc 6 is prohibited for several rotations of the disc until the track jump is resolved and the optical pickup 5 returns to the absolute address before the recording was stopped. Here, assuming that the maximum number of rotations of the disk 6 required for the optical pickup 5 to return to the absolute address before recording is stopped is N rotations and a tracking abnormality occurs immediately after the start of recording, the maximum required capacity of the memory means 1 is , M = R +
(N + 1) × Di = Dd−Di + (N + 1) × Di = D
It becomes d + N × Di. Further, considering that the tracking abnormality continuously occurs, the spare capacity of the memory means 1 is further required.

Next, FIG. 4 shows a configuration example of the access command generating means 14. In FIG. 4, the absolute address read data 117 and the absolute address storage data 118 are the subtractor 3
It is input to 0 and the difference between the two is calculated. This subtractor 30
Output 125 is input to the access discriminator 31 and the comparison value 1
A comparison with 26 is made. When the "H" pulse of the tracking abnormality command 119 is input to the access discriminator 31,
According to the value of the output 125 of the subtractor 30, the optical pickup 5
An access command 120 for accessing the absolute address before the abnormal recording stop is output to the tracking control means 8.

Here, the comparison value 126 is: Ab: Absolute address storage data 118 Ai: Absolute address storage data 118 coincides with the disk position in the radial direction, and one track inner circumference absolute address B: Comparison value 126 B = Ab−Ai is set, and for example, the subtracter 3
When the output 125 of 0 is B <Ad <2B, 2
It is determined that the track has jumped to the inner track, and the access command 120 to access the outer track is output. If -3B <Ad <-2B, then 3
It is determined that the track has jumped to the outer circumference of the track, and the access command 120 for accessing the inner circumference of the four tracks is output. The tracking control means 8 repeats track access of the optical pickup 5 according to the input access command 120 until 0 <Ad <B. If the output 125 of the subtractor 30 is already 0 <Ad <B when the “H” pulse of the tracking abnormality command 119 is input, the access command 120 is not output and the absolute address read data 117 is output. It waits until the absolute address storage data 118 before the abnormal recording stop coincides with.

FIG. 5 shows a track pattern recorded by the disk recording apparatus of this embodiment. One track corresponds to one rotation of the disk, a solid line shows a recorded track, and a broken line shows an unrecorded track. First, track numbers n-1, n,
Since the difference between the write address 104 and the read address 105 is equal to or less than the comparison value 109 at the time of recording n + 1, when the recording command 106 becomes “L”, the track jump (the thick solid line portion in FIG. 5) is immediately performed to make one. Return to the inner track and then on track again. Since the difference between the write address 104 and the read address 105 has returned to the comparison value 109 or more when the track number n + 1 has been repeated once again, the recording command 106 becomes “H” again, and the recording mode of the track number n + 2 is entered. Also, during recording of track number n + 2, the absolute address A
When a track jump from the address to the absolute address B occurs (the thick dotted line in FIG. 5), the tracking abnormality command 119 outputs a “H” pulse and immediately sets the recording command 106 to “L” to stop the recording operation. At the same time, according to the access command 120, the track is accessed to the inner circumference of the two tracks, and the track is turned on again. If the difference between the write address 104 and the read address 105 returns to the comparison value 109 or more when the absolute address A is reached again, the recording command 106 is given again.
Becomes "H", track number n + 2, absolute address A
The recording mode from is resumed.

FIG. 6 shows a waveform diagram of this embodiment. In FIG. 6, the remaining data capacity of the memory means 1 is shown at the bottom, and the comparison value 109 used by the comparator 22 in the recording command generation means 7 is shown.
Is indicated by a chain line. In this embodiment, the track number n + 1,
After recording n + 7, n + 16, and n + 19, the difference between the write address 104 and the read address 105 is the comparison value 1
Since the recording command 106 becomes smaller than 09, the recording command 106 becomes "L", and the process jumps to the track jump. In this case, after one rotation of the disc, the track numbers n + 2, n + 8, n + 17, and
Recording from n + 20 is started. Further, in this embodiment,
A track jump has occurred due to a tracking error during recording of track numbers n + 2 and n + 9, and the recording command 106 immediately becomes “L” and the recording is abnormally stopped. Since the optical pickup 5 requires one rotation and two rotations of the disk before returning to the absolute address before the abnormal recording stop, after prohibiting recording during that period, each of them continues after the absolute address before the abnormal recording stop. Track number n +
Recording of 2, n + 9 is resumed.

As described above, according to the present embodiment, the tracking abnormality command generating means 13 determines the continuity of the absolute address read data 117 during the recording operation and outputs the tracking abnormality command 119, and the recording instruction generating means 7 When the tracking abnormality command 119 is input, the recording command 10
6, recording is stopped, the absolute address storage data 118 before the recording stop coincides with the absolute address read data 117 after the recording stop, and the recording is performed when the difference between the write address 104 and the read address 105 is the comparison value 109 or more. By restarting, even if tracking abnormality occurs in the optical pickup 5 during recording operation due to disturbance such as vibration, a constant linear velocity is achieved irrespective of the input / output data rate, and there is no unnecessary empty area on the disk 6. Recording can be performed well. Further, whether or not to record on the disc is determined by the remaining data capacity of the memory means 1 and the comparison value 109, so that the rate ratio between the input data and the recording data can be set arbitrarily, and if only digital audio is used. Instead, it can be applied to the recording of various video information having different data rates depending on the method.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a block diagram of a disk reproducing apparatus according to the second embodiment of the present invention, FIG. 8 is a block diagram of reproduction command generating means in the second embodiment, and FIG.
FIG. 7 is a waveform diagram of each part in the disc reproducing apparatus of the embodiment.

In FIG. 7, the optical pickup 5 reproduces the optical pickup output 112 from the continuously recorded tracks on the disk 6. The optical pickup output 112 is supplied to the reproduction means 9 and, after amplification and demodulation, reproduced data 1
It is written in the memory means 1 as 13. The write address 104 is generated by the write address generating means 2 according to the reproduction data rate. The reproduction data 113 written in the memory means 1 is read according to the output data rate and becomes the output data 114. Read address 1
05 is generated by the read address generating means 3. The optical pickup 5 is subjected to tracking control during reproduction by the tracking control output 107 from the tracking control means 8.

The reproduction command 115 is input to the tracking abnormality command generation means 13 instead of the recording command 106 in the first embodiment shown in FIG. 2, and the reproduction operation is performed by determining the continuity of the absolute address read data 117. Tracking error command 1
19 is output. The detailed operation is the same as that of the first embodiment, and the description is omitted.

FIG. 8 shows an example of the structure of the reproduction command generating means 10. In FIG. 8, the difference between the write address 104 and the read address 105 is calculated by the subtracter 21, and then the comparator 22 compares the difference between them. The output 110 of the comparator 22 is input to the synchronization circuit 23, is synchronized by the synchronization clock 111 output once per one rotation of the disk 6, and is reproducible at "H" level, and at "L" level. A reproducible command 127 for instructing reproducibility is output. Also, the absolute address read data 117 and the absolute address storage data 118 before the reproduction is stopped
Is input to the coincidence detector 27. The coincidence detector 27 performs coincidence detection of both data, and when they coincide, for example, "H"
Output a pulse. The output 123 of the coincidence detector 27 is input to the abnormal stop instruction generating means 28 together with the tracking abnormality instruction 119 and the output 110 of the comparator 22. The abnormal stop command generation means 28 immediately instructs the abnormal stop of the reproducing operation when the "H" pulse of the tracking abnormal command 119 is input, and the coincidence detector 27 causes the absolute address storage data 118 before the abnormal stop and the abnormal stop. A match of the subsequent absolute address read data 117 is detected, and the comparator 22 writes the write address 104 and the read address 105.
If it is determined that the difference is greater than or equal to the comparison value 109, the abnormal stop command 1 for canceling the abnormal stop of the reproduction operation and instructing the restart of the reproduction is issued.
24 is output. Abnormal stop command 124 in this embodiment
Indicates that the reproduction operation is performed at the “H” level and the reproduction is stopped at the “L” level. The reproducible command 127 and the abnormal stop command 123 are input to the reproduction discriminator 32. Reproduction discriminator 29
Outputs a reproduction command 115 for prohibiting reproduction when both the reproducible command 127 and the abnormal stop command 123 are at "H" level, and when either one is at "L" level. The reproduction command 115 in this embodiment is “H”.
The reproduction operation is performed at the level, and the reproduction is prohibited at the “L” level.

Next, the setting of the comparison value 109 and the memory means 1
The relationship between the capacities will be described. Basically, the capacity of the memory means 1 should be such that the amount of data output during the next one rotation of the disk is secured. Therefore, the comparison value 109
Is Dp: amount of data reproduced from the disc 6 during the next one revolution of the disc Do: amount of output data read from the memory means 1 during the next one revolution of the disc R: comparison value 109 M: of the memory means 1 If the maximum required capacity is set, R = Do may be set. In this case, the reproduction command 115 is synchronized by the synchronization clock 111 that is output once per one rotation of the disc, so that the reproduction operation is performed when Dm is slightly smaller than R, and the reproduction of Dp is performed during the one rotation. Data 113 is written in the memory means 1,
Moreover, since the output data 114 of Do is output, the maximum value of the capacity of the memory means 1 is Do + (Dp-Do) = Dp.
Becomes However, the track jump of the optical pickup 5 caused by the tracking abnormality during the reproducing operation is not always resolved by one rotation of the disk and may require several rotations. In that case, the reproduction operation to the disk 6 is prohibited for several rotations of the disk until the track jump is resolved and the optical pickup 5 returns to the absolute address before the reproduction is stopped. Here, assuming that the maximum number of rotations of the disk 6 required for the optical pickup 5 to return to the absolute address before the reproduction is stopped is N rotations and a tracking abnormality occurs immediately after the reproduction is started, the comparison value 1
09 is R = (N + 1) × Do, and the maximum required capacity of the memory means 1 is M = R + (Dp−Do) = (N + 1) × Do.
+ Dp−Do = N × Do + Dp. Further, considering that the tracking abnormality continuously occurs, the comparison value 109 and the spare capacity of the memory means 1 are further required.

FIG. 9 shows a waveform chart of each part of this embodiment. Figure 9
In the figure, the remaining data capacity of the memory means 1 is shown at the bottom, and the comparison value 109 used by the comparator 22 in the reproduction command generating means 10 is shown by a chain line. In this embodiment, since the difference between the write address 104 and the read address 105 after the reproduction of the track numbers n + 2, n + 8, n + 17 and n + 20 is larger than the comparison value 109, the reproduction command 115 is generated.
Becomes "L", and the track jump is started. In this case, here, after one rotation of the disc, the track numbers n + 3, n + 9,
The memory means 1 stores the reproduced data 113 of n + 18 and n + 21.
Write in. Further, in this embodiment, the track number n + 3,
A track jump due to a tracking error has occurred during playback of n + 11, and the playback command 115 immediately becomes “L”.
Next, playback is abnormally stopped. It takes one rotation and two rotations of the disk before the optical pickup 5 returns to the absolute address before the abnormal reproduction stop, so after the reproduction during that period is prohibited, the absolute address before the abnormal reproduction stop is continued. The reproduction of the track numbers n + 3 and n + 11 is restarted.

As described above, according to the present embodiment, the tracking abnormality command generating means 13 determines the continuity of the absolute address read data 117 during the reproducing operation and outputs the tracking abnormality command 119 to reproduce the reproduction instruction generating means 10. Is
When the tracking abnormality command 119 is input, the reproduction command 1
15, the reproduction is stopped, the absolute address storage data 118 before the reproduction stop coincides with the absolute address read data 117 after the reproduction stop, and the reproduction is performed when the difference between the write address 104 and the read address 105 is the comparison value 109 or less. By restarting, even if a tracking abnormality occurs in the optical pickup 5 during a reproducing operation due to a disturbance such as vibration, reproduction is favorably performed at a constant linear velocity regardless of the data rate of the signal recorded on the disk 6. be able to.
Further, whether or not to reproduce from the disc is determined by the data capacity of the memory means 1 and the comparison value 109, so that the rate ratio between the output data 114 and the reproduction data 113 can be set arbitrarily, and it is simply digital audio. As well,
It can also be applied to reproduction of various video information or the like having different data rates depending on the method.

Next, a third embodiment of the present invention will be described with reference to the drawings. 10 is a block diagram of a disk recording apparatus according to the third embodiment of the present invention, FIG. 11 is a block diagram of a tracking abnormality command generating means in the third embodiment, and FIG. 12 is a waveform diagram of each part in the tracking abnormality command generating means. Is shown. In FIG. 10, components having the same configurations and operations as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The tracking error generating means 15 receives the output 128 obtained from the optical pickup 5 as an input and generates a tracking error signal 129 proportional to the off-track amount of the optical pickup 5 and outputs it to the tracking abnormality command generating means 13.

FIG. 11 shows an example of the structure of the tracking abnormality command generating means 13, and FIG. 12 shows an example of the waveform of each part. 11 and 12, the tracking error signal 129 is input to the envelope detector 33 and envelope-detected with a desired time constant (thick line in FIG. 12). The output 130 of the envelope detector 33 is input to the comparator 34, and its magnitude with the comparison value 131 is discriminated. When a tracking abnormality occurs during the recording operation and the optical pickup 5 causes a track jump, the tracking error signal 129 sharply increases. In the comparator 34, during the recording operation, that is, when the output 130 of the envelope detector 33 is equal to or higher than the comparison value 131 when the recording command 106 is at the “H” level, it is determined that a track jump due to a tracking abnormality has occurred, and for example, “H The pulse tracking abnormality command 119 is output. Here, the time constant of the envelope detector 33 is set to a value that can follow a steep increase in the tracking error signal 129 without detection error and can also follow the next track jump without detection error. Further, the comparison value 131 used in the comparator 34 is set to a value that can detect one track jump without fail, without erroneous detection during steady operation.

As described above, according to the present embodiment, the tracking error command generating means 13 uses the tracking error signal 1
By determining the magnitude of 29 and outputting the tracking abnormality command 119, the input / output data rate can be obtained even when a tracking abnormality has occurred in the optical pickup 5 during the recording operation due to a disturbance such as vibration as in the first embodiment. It is possible to satisfactorily perform recording on the disk 6 at a constant linear velocity and without wasteful empty areas regardless of the above. Moreover, since it is not necessary to read the absolute address, the responsiveness to the tracking abnormality is excellent as compared with the first embodiment.

Although not shown in the figure, the same effect can be obtained in the disc reproducing apparatus by the tracking abnormality command generating means 13 having the same configuration and determining the magnitude of the tracking error signal 129 and outputting the tracking abnormality command 119. You can

[0038]

As described above, according to the present invention, the tracking abnormality command generating means outputs the tracking abnormality command by discriminating the continuity of the absolute address read data during the recording operation, and the recording command generating means makes the tracking abnormality command. When is input, the recording is stopped by the recording command, the absolute address storage data before the recording stop coincides with the absolute address read data after the recording stop, and the difference between the write address and the read address is equal to or more than the predetermined comparison value. By restarting recording, even if a tracking abnormality occurs in the optical pickup during recording operation due to disturbance such as vibration, it is a constant linear velocity irrespective of the input / output data rate and there is no wasted empty area. Can be satisfactorily recorded. Therefore, since the recording frequency can be kept constant, the recording circuit can be simplified, and high-density recording can always be performed regardless of the input data rate.

Further, according to the present invention, the tracking abnormality command generating means outputs the tracking abnormality command by judging the continuity of the absolute address read data during the reproducing operation, and the reproduction command generating means receives the tracking abnormality command. Playback is stopped by a playback command, and if the absolute address storage data before playback is stopped matches the absolute address read data after playback is stopped and the difference between the write address and the read address is less than or equal to a predetermined comparison value, playback is restarted. As a result, even if a tracking abnormality occurs in the optical pickup during the reproducing operation due to a disturbance such as vibration, it is possible to favorably reproduce at a constant linear velocity regardless of the data rate of the signal recorded on the disc. Therefore, since the reproduction frequency can be kept constant, the reproduction circuit can be simplified.

Further, according to the present invention, the same effect can be obtained by the tracking abnormality command generating means determining the magnitude of the tracking error signal and outputting the tracking abnormality command. Furthermore, since it is not necessary to read the absolute address, it has excellent responsiveness to tracking abnormalities.

[Brief description of drawings]

FIG. 1 is a block diagram of a disk recording apparatus according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of tracking abnormality command generating means in the first embodiment of the present invention.

FIG. 3 is a configuration diagram of recording command generation means in the first embodiment of the present invention.

FIG. 4 is a configuration diagram of an access command generating means in the first embodiment of the present invention.

FIG. 5 is a track pattern diagram recorded by the disc recording apparatus according to the first embodiment of the present invention.

FIG. 6 is a waveform diagram of each part in the disk recording apparatus of the first embodiment of the present invention.

FIG. 7 is a block diagram of a disk reproducing device according to a second embodiment of the present invention.

FIG. 8 is a configuration diagram of a reproduction command generating means according to a second embodiment of the present invention.

FIG. 9 is a waveform diagram of each part in the disc reproducing apparatus according to the second embodiment of the present invention.

FIG. 10 is a block diagram of a disk recording device according to a third embodiment of the present invention.

FIG. 11 is a configuration diagram of tracking abnormality command generating means according to a third embodiment of the present invention.

FIG. 12 is a waveform diagram of each part in the tracking abnormality command generating means according to the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 memory means 2 write address generation means 3 read address generation means 4 recording means 5 optical pickup 6 disk 7 recording command generation means 8 tracking control means 11 absolute address reading means 12 absolute address storage means 13 tracking abnormality command generation means 14 access command generation means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI technical display location G11B 21/08 Y 8425-5D (72) Inventor Tetsushi Kasahara 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. (72) Inventor Hiroo Oikawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazuhiro Teshirogi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A disk device for performing recording using an optical pickup on a track of a disk-shaped recording medium to which an absolute address has been previously assigned, the absolute address reading means for reading the absolute address, and the absolute address reading. Absolute address storage means for temporarily storing an absolute address read by the means, memory means for storing digitally encoded input data, write address generation means for generating a write address of the memory means, and according to a recording command given Read address generating means for generating a read address of the memory means, and recording command generating means for detecting a difference between the write address and the read address and outputting the recording command when the difference is a predetermined comparison value or more. , Read from said memory means A recording means for recording a signal on the disc in accordance with the recording command, and the optical pickup is on-tracked on the track during a recording operation, and the optical pickup is track-jumped based on the recording command. Tracking control means for causing the optical pickup to access a desired track according to an access command, tracking abnormality command generating means for detecting a tracking abnormality of the optical pickup and outputting a tracking abnormality command, and the tracking abnormality command when the tracking abnormality command is given An access command generating means for outputting an access command to access the pickup to a desired track, wherein the recording command generating means stops recording by the recording command when the tracking abnormality command is input, and address When the absolute address before the recording stop temporarily stored by the storage means and the absolute address after the recording stop read by the absolute address reading means match, and the difference between the write address and the read address is equal to or more than a predetermined comparison value. A disk recorder that resumes recording. 2. A disk device for reproducing a digital signal recorded on a track of a disk-shaped recording medium to which an absolute address has been previously given by using an optical pickup, and an absolute address reading means for reading the absolute address. An absolute address storing means for temporarily storing an absolute address read by the absolute address reading means, a reproducing means for demodulating an output signal from the optical pickup, and a reproducing signal demodulated by the reproducing means Memory means, a write address generating means for generating a write address of the memory means in accordance with a given reproduction command, a read address generating means for generating a read address of the memory means, and a difference between the write address and the read address. Detected and the difference is Reproduction command generating means for outputting the reproduction command when the value is equal to or less than a predetermined comparison value, and the optical pickup is on-tracked on the track at the time of reproduction operation, and the optical pickup is track-jumped based on the reproduction command. A tracking control means for causing the optical pickup to access a desired track according to a given access command, a tracking abnormality command generating means for detecting a tracking abnormality of the optical pickup and outputting a tracking abnormality command, and the tracking abnormality command are given. And an access command generation unit that outputs an access command to access the optical pickup to a desired track, and the reproduction command generation unit,
When the tracking abnormality command is input, the reproduction is stopped by the reproduction command, and the absolute address before the reproduction stop temporarily stored by the absolute address storage means and the absolute address after the reproduction stop read by the absolute address reading means are A disc reproducing apparatus that resumes reproduction when they match and the difference between the write address and the read address is less than or equal to a predetermined comparison value. 3. The disk recording and reproducing apparatus according to claim 1, wherein the tracking abnormality command generating means outputs the tracking abnormality command by determining the continuity of absolute addresses read by the absolute address reading means. 4. A tracking error generation means for generating a tracking error signal from the output of the optical pickup, wherein the tracking abnormality command generation means outputs the tracking abnormality command by determining the magnitude of the tracking error signal. The disk recording and reproducing apparatus according to claim 2.