JP2003109327A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recorder for continuously recording data on a disk by interrupting recording of the data on the disk and recording the data again from a succeeding part in the case synchronous deviation is detected during recording. SOLUTION: A wobble signal is detected by making a regenerative signal from an optical disk 1 pass through a bandpass filter 9. A signal for data synchronization is outputted from a data signal separated from the wobble signal, a clock generation circuit 13 and a PLL circuit 14 generate a recording clock from the wobble signal, and synchronous deviation is detected on the basis of relation between the signal for data synchronization and the recording clock. In detecting synchronous deviation, recording is interrupted in a data recording unit. Thereafter, continuous data can be recorded on the disk by pulling in synchronism again and starting recording from the next data recording unit of the data recording unit where recording is interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording apparatus for recording information using an optical disc.

[0002]

2. Description of the Related Art In recent years, in a writable optical disc, a guide groove (groove) and a space (land) between the guide grooves are meandered (wobbles) to synchronize a write clock to the disc with a wobble and to write an address on the wobble. Means for holding information data are used.

For example, as shown in FIG. 2, the frequency (A) of the basic constant wobble period is frequency-modulated (B), the phase is shifted by 180 degrees (C), or the land portion is pre-set. -pit is formed (D) to identify whether the data is 1 or 0 and hold the information. (C) is + R specification, + RW
In the specifications, (D) is a DVD-R specification and a DVD-RW specification.

Recording is performed on the optical disc using these wobbles and information data. If these signals can be stably obtained from the optical disc, stable recording can also be performed on the disc. However, if for some reason it is not stable,
Naturally, stable recording will not be possible. For example, when the wobble cannot be obtained correctly, the write clock cannot be correctly generated, and a synchronization shift occurs between the disk and the write clock. It is not preferable to continue recording in such a situation, and it is desirable to temporarily stop recording.

As an example of such a configuration, Japanese Patent Laid-Open No. 2000-82212
Is mentioned. Here, using a DVD-RAM as an example, the first cycle based on the ID position detection timing generated from the physical address position called ID is compared with the second cycle based on the wobble PLL clock, and both are compared. The state is determined based on the cycle of, and if it is determined to be inappropriate, recording is interrupted. Alternatively, recording is interrupted when wobble loss is detected.

[0006]

The conventional technique has a problem in that the synchronization deviation can be detected only in ID units. Then, the synchronization deviation detection becomes slow.

Further, there is no clear definition of the recording break point.
In the text of the embodiment of the invention of the above publication, the recording is immediately interrupted even while the data is being recorded in the predetermined area in the continuous sectors.
Recording can be interrupted even in the middle of a sector where data is being recorded. If the recording is interrupted at a point other than the recording unit, the recording unit becomes uncorrectable by error correction.

Furthermore, although it is preferable that the minimum recording unit always has one ID and recording is performed in the minimum recording unit,
When a plurality of minimum recording units are collected to form a block of product codes for error correction and recording is performed, recording is performed in units of blocks of product codes. In such a case, if the recording is interrupted by the minimum recording unit, if it is not the block boundary of the product code, it can be corrected by the error correction of the inner code, but cannot be corrected by the error correction of the outer code. All data in the block structure of the code will be destroyed. The conventional technology has the above problems.

An object of the present invention is to monitor the relationship between a data synchronization signal detected from a disc and a clock generated by wobble to detect a synchronization deviation quickly, and to interrupt recording at the end of a data recording unit. An object of the present invention is to provide an optical disk recording apparatus that becomes a continuous recording state on a disk by restarting recording from the beginning of the next data recording unit.

[0010]

An optical disk recording apparatus according to the present invention comprises a means for detecting an address bit signal from an optical disk having wobbles with addresses, and a means for generating a clock synchronized with the wobbles. In the optical disc recording apparatus for recording data on the optical disc based on the above, means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the wobble channel clock cycle counter is provided. It is characterized in that the recording on the optical disc is interrupted when the number of times of exceeding a predetermined phase shift range within a predetermined data recording length exceeds a predetermined threshold value.

Further, according to the present invention, data is recorded on the optical disk based on the clock by means for detecting an address bit signal from the optical disk on which wobbles with addresses are formed and means for generating a clock synchronized with the wobble. In an optical disk recording apparatus for recording, a means for generating a data synchronization signal from the address bit signal and detecting a synchronization state of the data synchronization signal and the clock are provided, and within a predetermined data recording length, When the number of times that the data synchronization signal is not detected within the window having the predetermined time width before and after the timing specified by the clock exceeds the predetermined threshold, the recording on the optical disc is interrupted. It is characterized by doing.

Further, according to the present invention, data is recorded on the optical disk based on the clock by means of detecting an address bit signal from the optical disk on which wobbles with addresses are formed and means for generating a clock synchronized with the wobble. In an optical disk recording apparatus for recording, a means for generating a data synchronization signal from the address bit signal and detecting a synchronization state of the data synchronization signal and the clock are provided, and within a predetermined data recording length, When the number of times the data synchronization signal is detected outside the window having the predetermined time width before and after the timing specified by the clock exceeds the predetermined threshold, the recording on the optical disc is interrupted. It is characterized by that.

Further, according to the present invention, data is recorded on the optical disk based on the clock by means for detecting an address bit signal from the optical disk on which wobbles with addresses are formed and means for generating a clock synchronized with the wobble. In the optical disc recording apparatus for recording, comprising means for detecting an address and parity for the address from the address bit signal, when the number of parity check errors within a certain number of times of address detection exceeds a predetermined threshold value, The feature is that recording on the optical disk is interrupted.

Further, according to the present invention, data is recorded on the optical disk based on the clock by means for detecting an address bit signal from the optical disk on which wobbles with addresses are formed and means for generating a clock synchronized with the wobble. An optical disk recording apparatus for recording includes means for detecting an address and a parity for the address from the address bit signal, and the number of times of mismatch between the address and the expected address value within a certain number of times of detecting an address is a predetermined threshold value. It is characterized in that the recording on the optical disk is interrupted when the value exceeds the limit.

The present invention is also directed to the number of times that the predetermined phase shift range is exceeded, the number of times of non-detection within the window, the number of times of detection outside the window, and the parity check. When the total number of times of error and the number of times of mismatch between the address and the expected address value exceeds the predetermined threshold, recording on the optical disk is interrupted. There is.

According to the present invention, data is recorded on the optical disk based on the clock by means of detecting an address bit signal from an optical disk having wobbles with address pits and means for generating a clock synchronized with the wobble. In the optical disc recording apparatus for recording in, to generate a data synchronization signal from the address bit signal,
A means for detecting the synchronization state between the data synchronization signal and the in-wobble channel clock cycle counter is provided, and the number of times of exceeding a predetermined phase shift range within a predetermined data recording length is predetermined. When the threshold value is exceeded, the recording on the optical disc is interrupted.

Further, according to the present invention, data is recorded on the optical disc based on the clock by means for detecting an address bit signal from an optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. In the optical disc recording apparatus for recording in, to generate a data synchronization signal from the address bit signal,
A means for detecting a synchronization state between the data synchronization signal and the clock, within a predetermined data recording length,
When the number of times that the data synchronization signal is not detected within a window having a predetermined time width before and after the timing specified by the clock exceeds a predetermined threshold value, recording on the optical disc is performed. It is characterized by interruption.

Further, according to the present invention, data is recorded on the optical disk based on the clock by means for detecting an address bit signal from an optical disk having wobbles with address pits and means for generating a clock synchronized with the wobble. In the optical disc recording apparatus for recording in, to generate a data synchronization signal from the address bit signal,
A means for detecting a synchronization state between the data synchronization signal and the clock, within a predetermined data recording length,
When the number of times the data synchronization signal is detected outside the window having the predetermined time width before and after the timing specified by the clock exceeds the predetermined threshold, the recording on the optical disc is interrupted. It is characterized by doing.

Further, according to the present invention, data is recorded on the optical disc based on the clock by means of detecting an address bit signal from the optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. In the optical disk recording apparatus for recording according to the above item, means for detecting an address and a parity for the address from the address bit signal is provided, and when the number of parity check errors within a certain number of times of address detection exceeds a predetermined threshold value. The feature is that recording on the optical disk is interrupted.

Further, according to the present invention, data is recorded on the optical disc based on the clock by means for detecting an address bit signal from the optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. In the optical disk recording apparatus for recording in the above, a means for detecting an address and a parity for the address from the address bit signal is provided, and the number of times of disagreement between the address and the expected address value within a certain number of times of address detection is predetermined. It is characterized in that recording on the optical disk is interrupted when the threshold value is exceeded.

The present invention is also directed to the number of times the predetermined phase shift range is exceeded, the number of times of non-detection within the window, the number of times of detection outside the window, and the parity check. When the total number of times of error and the number of times of mismatch between the address and the expected address value exceeds the predetermined threshold, recording on the optical disk is interrupted. There is.

Further, the present invention is characterized in that the position at which the recording is interrupted is a time point when it is judged that the threshold value is exceeded.

Further, the present invention is characterized in that the position at which the recording is interrupted is a predetermined boundary between data recording units on the disk.

Further, the present invention is characterized in that the position at which the recording is interrupted is a time point when the recording of a predetermined data recording unit is completed.

Further, according to the present invention, when the position at which the recording is interrupted is set to a predetermined boundary of data recording units on the disk, at the position at which the recording is interrupted, all the data in the data recording unit are When the recording is completed first, the dummy data is recorded up to the position where the recording is interrupted.

Further, according to the present invention, after interrupting the recording,
Resynchronization of the clock with the data signal is performed, and the recording operation is restarted before the data recording unit in which the recording was interrupted or from the data recording unit in which the recording was interrupted.

Further, according to the present invention, after interrupting the recording,
Re-synchronization of the clock with the data signal is performed, and the recording operation is restarted from the beginning of the data recording unit next to the data recording unit in which the synchronization shift is detected.

In addition, according to the present invention, after the recording is interrupted,
When resynchronizing the clock with the data signal and restarting the recording operation, in the data recording unit area exceeding the threshold, the clock is not synchronized with the data synchronization signal, It is characterized in that the synchronized phase is held by the data recording unit area.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. Control circuit 4,
From the optical disk 1 rotated by the motor 2, the optical head 3
The signal is read at and is supplied to the reproducing circuit 7. The signal that has passed through the reproduction circuit 7 is passed through a bandpass filter 9 to extract ADIP data and a wobble signal,
The address detection circuit 10 detects an address, and the data synchronization signal detection circuit 11 detects a data synchronization signal.

The clock generation circuit 13 and the PLL circuit 14 generate a wobble clock and a recording channel clock. The synchronization deviation is detected from the data synchronization signal output from the data synchronization signal detecting circuit 11 and the recording channel clock, the synchronization deviation is detected by the recording improper state detection circuit 12, and the synchronization deviation is determined by the condition judging circuit 5 in advance. It is determined whether or not it has exceeded. When the condition is satisfied, the recording is interrupted by the internal synchronization circuit 8 and the ligate generation circuit 6. Then, when resuming recording,
The address detection circuit 10, the internal synchronization circuit 8, and the ligate generation circuit 6 start recording from the next data recording unit in which recording was interrupted.

Next, the operation of the embodiment shown in FIG. 1 will be described. Figure 3 shows wobble and ADIP in + R / RW specifications.
FIG. 4 shows a relationship between (Address in Pre-groove) data, and FIG. 4 shows a relationship between ADIP data and a data synchronization signal.

ADIP_word_sync is 52bi
A signal indicating the beginning of a certain ADIP_bit.
_ZERO_bit is data “0”, ADIP_ONE
_Bit indicates data "1", and it can be determined by inputting data of 8 wobbles.

Since the signal reproduced from the disc 1 is superposed with the actually recorded data, the ADIP data and the wobble signal, the bandpass filter 9 is used to separate the ADIP data and the wobble signal. To be extracted. Then, ADIP data is generated with a phase difference of 180 degrees as negative_wobble, and a phase difference of not positive as positive_wobble, and the address detection circuit 10 decodes the address to determine the head position and a data synchronization signal. The detection circuit 11 generates a data synchronization signal. This data synchronization signal is the above-mentioned ADIP_word_sy.
nc, ADIP_ZERO_bit, ADIP_ONE
It is output when any one of the _bits is detected.

As for the clock, the clock generation circuit 13 and the PLL circuit 14 generate a wobble clock and a recording channel clock based on the wobble signal. + R / R
According to the W specification, 32 channel bits are recorded in one wobble cycle, so the recording channel clock is a clock 32 times as long as the wobble clock.

The ADIP data has a period of 93 wobbles, and the above-mentioned ADIP_word_sync and ADIP_
Either ZERO_bit or ADIP_ONE_bit is input. Therefore, by using the rule of 93 wobble cycle, when the data synchronization signal is detected, it is possible to check whether the relationship with the clock is maintained from the data synchronization signal detected immediately before. It can be carried out.

Specifically, a detection window having a width in front and behind is provided for the next data synchronization signal detection point,
It is checked whether the next data synchronization signal is detected in it or not.

In the normal stable state, the data synchronization signal is 9
It can be obtained in three wobble cycles, and based on that, recording on the disc is performed. But for some reason,
Suppose this relationship is broken. For example, when an abnormal rotation speed of the disc occurs or a correct wobble signal cannot be obtained due to scratches on the disc, the wobble clock and the recording channel clock try to follow the wobble signal obtained from the disc. Since they are multiplied by each other, the regular clock is disturbed. Since the tracking is performed gently, the relationship between the data synchronization signal and the 93 wobble clock cycle is broken at that time, and recording continues with a disturbed clock during that time.

Therefore, as described above, the relation between the next data synchronization signal and the detection window is checked, and if it is not detected within the detection window or is detected outside this detection window, the temporary synchronization shift occurs. Is considered to have occurred. However, due to a playback error, it may not be detected within the detection window, or may be detected outside the detection window. Therefore, within the predetermined data recording length, the data synchronization exceeding the predetermined threshold is performed. When a signal is detected, it is recognized that a true synchronization shift has occurred.

Further, instead of the window, the phase relationship with the 32-channel clock cycle counter in wobble (ADIP1 channel clock counter in wobble) at the time of outputting the data synchronization signal is checked, and within a predetermined data recording length, Even when the number of times of exceeding the predetermined phase shift range exceeds the predetermined threshold, it can be considered that the synchronization shift has occurred.

In addition, when the number of parity check errors at the time of address detection within a certain number of address detections exceeds a predetermined threshold value, or the detected address within a certain number of address detections is different from the expected value. When the number of times of recording exceeds a predetermined threshold value, it can be recognized that the recording is inadequate.

Further, the number of times of not being detected within the above-mentioned window, the number of times of being detected outside the window, the number of times when the phase relationship is not supposed to be, the number of address parity errors, and the number of times of disagreement with the expected address value. Even when the total number exceeds a preset threshold value, it can be considered as an improper recording state.

In the case where the above-mentioned synchronization deviation and improper recording occur, if the recording is continued as it is, the recording data will continue to be deviated from the position to be originally recorded on the disc, so that the recording interruption process is performed. You will need it. In that case, either the recording is immediately interrupted or the recording is interrupted at the end of a certain unit.

Immediately, in the case of interruption of recording, it is preferable in that the subsequent data will not be overwritten. However, recording usually means recording in the minimum unit of recording, for example, in sector units. An error correction function is also included in this, and if recording is not performed in this unit, it becomes impossible to correct by error correction, and all data in that sector becomes invalid. Therefore, it is desirable to interrupt recording in recording units.

Next, the minimum recording unit may not be the sector unit but may be the block unit which constitutes the error correction product code by using a plurality of sectors. This is widely used in recording / reproducing systems for digital signals because it makes it possible to strongly correct a reproducing error by using a product code.

In this case, if the recording interruption process is performed in the unit of sector, if it is not the boundary of the unit of block, the first half and the second half of the block are composed of unrelated data. Even if an error is not detected in the code error correction, the error cannot be corrected in the outer code error correction, and as a result, all the data in the block becomes invalid.

Therefore, when the synchronization deviation or the improper recording state is detected, it is desirable to detect the boundary of the data recording unit and then perform the recording interruption process instead of immediately interrupting the recording. By doing so, it becomes possible to restore data in error correction.

However, when the boundary of the recording unit is detected, the boundary detection process actually takes some time inside the circuit, so that point is exceeded. However, in the + R / RW specification, the start and end of recording is 16 from ADIP_SYNC.
The point is 8Chennel_Bit before the wobble delayed phase. Therefore, after detecting ADIP_SYNC, it is sufficient to count up to that point with the conventional clock and perform the recording interruption process there.

After that, the occurrence of the synchronization deviation and the improper recording state means that the end point of the data recording unit from the disc and the final recording Bit of the actually recording data recording unit do not match. When the recording channel clock becomes slower than the value obtained from the original wobble of the disc, the recorded data is left over even if the end point of the data recording unit is detected from the disc.

In such a case, the recording is forcibly interrupted according to the end point of the data recording unit from the disc, and the remaining recording data is discarded. On the contrary, when the recording channel clock is faster than the value obtained from the original wobble signal of the disc, the recording data is insufficient when the end point of the data recording unit is detected from the disc. .

In such a case, the dummy data is recorded up to the end point of the data recording unit on the disk when the recording data is exhausted. Here, the dummy data is all "0" data or a defined pattern, which is recorded as it is or is recorded after being converted into a recording modulation system again.

As a result, when a sync shift or an improper recording state is detected, the recording can be interrupted at the end of the data recording unit from the disc.

Next, since it was forcibly interrupted that it was originally desired to continue recording, the continuation must be recorded. Therefore, in that case, the optical head is made to jump to the inner circumference side of the disk, and synchronization is re-pulled in again. Then, the recording of the following data is restarted from the end of the data recording unit from the disk where the recording was interrupted, that is, the head of the next data recording unit.
By processing in this way, it is possible to record continuous data on the disc.

The above-mentioned recording interruption point is set at the position where the boundary of the data recording unit is detected from the disc. However, if recording is performed again and continuous data is formed on the disc, the recording is interrupted. The point may be a position where synchronization deviation or an improper recording state is detected, or may be after recording data for each data recording unit on the disc, regardless of the data recording unit from the disc. At that time, the end point does not match the data recording unit of the disc, and whether it is long or short, the data recording unit from the disc that detected the synchronization deviation or the improper recording state, or from the disc before that From the data recording unit of
By recording again, continuous data can be recorded on the disc.

The causes of the synchronization deviation and the improper recording state may be scratches or dust on the disc.
In this case, even if the recording is attempted again, the synchronization shift occurs at the same location, an improper recording state occurs, and the recording is interrupted even if the recording is attempted from the data recording unit. Further, even if the recording is started from the next data recording unit, the clock becomes unstable. Therefore, in such a case, the wobble clock and the recording channel clock are not synchronized with the wobble signal in the data recording unit in which the synchronization deviation and the improper recording state are detected. As a result, the synchronization shift detection does not occur, the data recording unit can be passed, and if the clock is synchronized from the next data recording unit, continuous recording on the disk becomes possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described. In the first embodiment, + R / R
Although the W specification has been described, the DVD-R / RW specification can be similarly considered. In this case, LPP (La
nd Pre Pit) method.

FIG. 5 shows wobbles and LPs in the DVD-R / RW specifications.
Fig. 6 shows the relationship of P (Land Pre Pit).
And the data synchronization signal.

The LPP composes SYNC and data with 3 wobbles and exists only in either the EVEN frame or the ODD frame. SYNC EVEN is a code indicating the first EVEN frame of the sector, SYNC ODD is a code indicating the second ODD frame of the sector, and other frames are composed of data 1 or data 0.

In the signal reproduced from the disc 1, actually recorded data, LPP and wobble are superimposed. Therefore, the address detection circuit 10 decodes the address from the LPP to determine the head position, and the data synchronization signal detection circuit 11 generates the data synchronization signal. This data synchronization signal is the same as the SYNC EVEN, SYNCO
It is output when any one of DD, data 1 and data 0 is detected.

As for the clock, the clock generation circuit 13 and the PLL circuit 14 generate a wobble clock and a recording channel clock based on the wobble signal. DVD-R / RW
According to the specifications, 186 channel bits are recorded in one wobble cycle, so the recording channel clock is a clock 186 times as long as the wobble clock.

In the DVD-R / RW, one frame is composed of 8 wobbles and one sector is composed of 26 frames. Since the LPP exists in either the EVEN frame or the ODD frame, the signal for data synchronization is 8 wobbles (ODD frame → EVEN frame) or 16 wobbles (EVEN frame →
(EVEN frame or ODD frame → ODD frame)
It is detected in units of 24 wobbles (EVEN frame → ODD frame). Therefore, by checking the relationship between the detection interval and the number of recording clocks during that interval, it is possible to determine whether the synchronization relationship is maintained.

Specifically, detection windows of widths before and after are provided for the next data synchronization signal detection point,
Check the relationship with the next data synchronization signal. Normal,
The data synchronization signal is detected at a cycle of 8 wobbles × n × 186 recording clocks (n is 1, 2, 3). Therefore, 8
After wobble × 186 recording clocks, it is checked whether the data synchronization signal is detected within the ± detection window.

In the ideal state, the data synchronization signal is obtained in 8 wobbles × n × 186 recording clock cycles. However, this cycle may collapse for some reason. For example, when an abnormal rotation speed of the disc occurs, or when a correct wobble signal cannot be obtained due to scratches on the disc, the wobble clock and recording channel clock try to follow the wobble signal obtained from the disc. In order to match the PLL, the cycle differs from the original recording clock. Following is done gently,
During that time, recording will continue to be performed with the recording clock having a different cycle.

Therefore, as described above, the relationship between the next data synchronization signal and the detection window is checked, and if the signal is not detected within the detection window or is detected outside the detection window, the temporary synchronization is performed. It is considered that a shift has occurred. However, the detection window is opened in 8 wobble cycles, whereas the data synchronization signal is detected in 8 × n wobble cycles, so it is not detected in each detection window. In addition, due to a playback error, it may not be detected within the detection window or may be detected outside the detection window. Therefore, within the predetermined data recording length, the data synchronization is performed by exceeding the predetermined threshold. When a signal is detected, it is recognized that a true synchronization shift has occurred.

Further, instead of the window, the phase relationship with the 186 channel clock cycle counter in the wobble at the time of outputting the data synchronization signal is checked, and the predetermined phase shift range is set within the predetermined data recording length. Even when the number of times of exceeding exceeds the predetermined threshold, it can be considered that the synchronization deviation has occurred.

In addition, when the number of parity check errors at the time of detecting an address within a certain number of times of address detection exceeds a predetermined threshold, or when the number of detected addresses within a certain number of address detection times is different from the expected value. When the number of times of recording exceeds a predetermined threshold value, it can be recognized that the recording is inadequate.

Further, the number of times of not being detected within the above-mentioned window, the number of times of being detected outside the window, the number of times that the phase relationship is not supposed to be, the number of address parity errors, and the number of times of mismatch with the expected address value are included. Even when the total number exceeds a preset threshold value, it can be considered as an improper recording state.

When the above-mentioned synchronization deviation and improper recording occur, if the recording is continued as it is, the recording data will continue to be deviated from the position to be originally recorded on the disc, so that the recording interruption process is necessary. is there. In that case, the recording is immediately interrupted or the recording is interrupted at the end of a certain unit.

In the case of immediate interruption of recording, it is preferable in that the subsequent data will not be overwritten. But,
Normally, recording is performed in the minimum unit of recording, for example, in sector units. Error correction parity is also included in this, and correction cannot be made unless recording is performed in this unit, and all data in that sector becomes invalid.

Next, there is also a block unit in which the minimum unit of recording is not a sector but a plurality of sectors are used to form a product code for error correction. This is widely used in recording / reproducing systems for digital signals because it can strongly correct a reproducing error by using a product code.

In this case, if the recording interruption process is performed in sector units, if it is not a block unit boundary, the first half and the second half of the block are composed of unrelated data, and an error occurs in the inner code. Even if it can be corrected, it cannot be corrected by the outer code, and as a result, all the data in the block becomes invalid.

Therefore, when the synchronization deviation or the improper recording state is detected, it is desirable to detect the boundary of the data recording unit before performing the recording interruption process instead of immediately interrupting the recording. By doing so, it becomes possible to restore data in error correction.

However, the occurrence of the synchronization deviation and the improper recording state means that the end point of the data recording unit from the disk and the final recording bit of the actually recording data recording unit do not match. When the recording channel clock is slower than the cycle obtained from the original wobble of the disc, the record data remains even if the end point of the data recording unit is detected from the disc. In this case, recording is forcibly interrupted according to the end point of the data recording unit from the disc, and the remaining recording data is discarded.
On the contrary, when the recording channel clock is faster than the period obtained from the original wobble signal of the disc, the recording data is insufficient when the end point of the data recording unit is detected from the disc. In this case, the dummy data is recorded up to the end point of the data recording unit on the disc when there is no record data. Here, the dummy data is all 0 data or a defined pattern, which is recorded as it is or is converted to a recording modulation system and recorded again.

As a result, when a sync shift or an improper recording state is detected, the recording can be interrupted at the end of the data recording unit from the disc.

Next, since it was forcibly interrupted that it was originally desired to continue recording, the continuation must be recorded. Therefore, the optical head is made to jump to the inner circumference side of the disk to re-engage the synchronization. Then, the recording of the following data is restarted from the data recording unit in which the recording is interrupted. By processing in this way, it is possible to record continuous data on the disc.

The above-mentioned recording interruption point is the position where the boundary of the data recording unit is detected from the disc. However, if recording is performed again and continuous data is formed on the disc, the recording interruption point is Alternatively, it may be at a position where synchronization deviation or improper recording is detected. Alternatively, the data for each data recording unit may be recorded on the disc instead of the data recording unit position on the disc. Whether the end point does not match the data recording unit of the disc, whether it is long or short, the data recording unit of the disc that has detected synchronization deviation or improper recording, or the data recording unit of the disc before that By recording again, continuous data can be recorded on the disc.

The causes of the synchronization deviation and the improper recording state are scratches and dust on the disk. In this case, even if an attempt is made to record again, the synchronization shift occurs at the same location, an improper recording state occurs, and the recording interruption is repeated. Further, even if the recording is started from the next data recording unit, the recording clock becomes unstable. Therefore, in such a case, the wobble clock and the recording channel clock are not synchronized with the wobble signal in the data recording unit in which the synchronization deviation and the improper recording state are detected. As a result, the data recording unit can be passed without detection of synchronization deviation, and if the clock is synchronized from the next data recording unit, recording can be continuously performed on the disc.

In the previous section, the data synchronization signal is
Although it is assumed that the signal is output when any of VEN, SYNC ODD, data 1 and data 0 is detected, only SYNC EVEN and SYNC ODD may be used as the data synchronization signal. The detection interval is once every two frames in the former, but once in one sector in the latter. Detection frequency decreases, but the number of configured LPPs is SYNC
There are three EVENs and one data 0. Therefore, 1
If it is erroneously detected as LPP, it will be erroneously recognized as data 0. As a result, the number of out-of-window detections described above increases by 1, and the probability of erroneous recording interruption processing increases.

Actually, if there is an in-window detection, the out-of-window detection number is cleared, and if the out-of-window detection number is equal to or more than a set threshold value, it is determined that there is a synchronization deviation, so that it does not usually cause a problem. However, it is effective when there are too many LPP erroneous detections, so if you apply it while making a determination, recording interruption processing and recording restart operation will be performed appropriately as described above,
It is possible to record continuous data on the disc.

[0080]

As described above, according to the present invention, when a sync shift or an improper recording state is detected, the recording is interrupted at the boundary of the data recording unit, and then the synchronization is pulled in again. By recording data from the boundary of the next data recording unit, it is possible to provide an optical disc recording apparatus that enables continuous recording on the disc.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a relationship diagram of wobble frequencies.

FIG. 3 is a relationship diagram between wobble and ADIP data in + R / RW specifications.

FIG. 4 is a relationship diagram between ADIP data and a data synchronization signal in + R / RW specifications.

FIG. 5: Wobble and LP in DVD-R / RW specifications
It is a relationship diagram of P data.

FIG. 6 is a relationship diagram between LPP data and a data synchronization signal in the DVD-R / RW specification.

[Explanation of symbols] 1 optical disc 2 motor 3 optical head 4 control circuit 5 Condition judgment circuit 6 Write gate generation circuit 7 playback circuit 8 Internal synchronization circuit 9 bandpass filter 10 Address detection circuit 11 Data synchronization signal detection circuit 12 Synchronous deviation, improper recording state detection circuit 13 Clock generation circuit 14 PLL circuit

Claims (19)

[Claims] 1. A means for detecting an address bit signal from an optical disk having wobbles with addresses, and a means for generating a clock synchronized with the wobbles.
In an optical disc recording device for recording data on the optical disc based on the clock, a data synchronization signal is generated from the address bit signal, and a synchronization state between the data synchronization signal and the wobble channel clock cycle counter is detected. Means for recording on an optical disc when the number of times the output phase at the clock exceeds a predetermined phase shift range within a predetermined data recording length exceeds a predetermined threshold value. An optical disk recording device characterized by interruption. 2. A means for detecting an address bit signal from an optical disc on which wobbles with addresses are formed, and a means for generating a clock synchronized with the wobbles,
An optical disk recording device for recording data on the optical disk based on the clock, comprising means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the clock, The number of times that the data synchronization signal is not detected within the window having the predetermined time width before and after the timing specified by the clock within the predetermined data recording length exceeds the predetermined threshold. An optical disk recording apparatus, characterized in that recording on an optical disk is interrupted in the event of a failure. 3. A means for detecting an address bit signal from an optical disc on which wobbles with addresses are formed, and a means for generating a clock synchronized with the wobbles,
An optical disk recording device for recording data on the optical disk based on the clock, comprising means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the clock, Within the predetermined data recording length, the number of times the data synchronization signal is detected outside the window having the predetermined time width before and after the timing specified by the clock exceeds the predetermined threshold. In this case, an optical disk recording device characterized by interrupting recording on the optical disk. 4. A means for detecting an address bit signal from an optical disk on which wobbles with addresses are formed, and a means for generating a clock synchronized with the wobbles,
An optical disk recording apparatus for recording data on the optical disk based on the clock, comprising means for detecting an address and a parity for the address from the address bit signal, and the number of the parity check errors within a certain number of times of address detection is preset. An optical disk recording apparatus, wherein recording on an optical disk is interrupted when a predetermined threshold is exceeded. 5. A means for detecting an address bit signal from an optical disc on which wobbles with addresses are formed and a means for generating a clock synchronized with the wobbles are provided.
An optical disc recording apparatus for recording data on the optical disc based on the clock, comprising means for detecting an address and a parity for the address from the address bit signal, and for detecting the address and the expected address value within a certain number of times of address detection. An optical disk recording apparatus, wherein recording on an optical disk is interrupted when the number of times of disagreement exceeds a predetermined threshold value. 6. The number of times that the predetermined phase shift range is exceeded according to claim 1, the number of times that is not detected within the window according to claim 2, and the outside of the window according to claim 3. 5. The number of times detected in
If the total number of times of the parity check errors described above and the number of times of mismatch between the address and the expected address value described in claim 5 exceeds a predetermined threshold value, the optical disc An optical disk recording apparatus characterized by interrupting recording on a disc. 7. An optical disc for recording data on the optical disc based on the clock by means of detecting an address bit signal from an optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. The recording apparatus includes means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the in-wobble channel clock cycle counter, and within a predetermined data recording length. If the number of times the phase shift range exceeds a predetermined threshold value exceeds a predetermined threshold value,
An optical disk recording device characterized by interrupting recording on an optical disk. 8. An optical disc for recording data on the optical disc based on the clock by means for detecting an address bit signal from an optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. The recording device includes means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the clock, and for the data synchronization within a predetermined data recording length. Interrupting the recording on the optical disc when the number of times that the signal is not detected within the window having the predetermined time width before and after the timing specified by the clock exceeds the predetermined threshold. A characteristic optical disk recording device. 9. An optical disk for recording data on the optical disk based on the clock by means for detecting an address bit signal from an optical disk having wobbles with address pits and means for generating a clock synchronized with the wobble. The recording device includes means for generating a data synchronization signal from the address bit signal and detecting a synchronization state between the data synchronization signal and the clock, and for the data synchronization within a predetermined data recording length. If the number of times the signal is detected outside the window having a predetermined time width before and after the timing specified by the clock exceeds a predetermined threshold,
An optical disk recording device characterized by interrupting recording on an optical disk. 10. An optical disk for recording data on the optical disk based on the clock by means for detecting an address bit signal from an optical disk having wobbles with address pits and means for generating a clock synchronized with the wobble. The recording device includes means for detecting an address and parity for the address from the address bit signal, and when the number of parity check errors within a certain number of address detection exceeds a predetermined threshold value, An optical disk recording device characterized by interrupting recording. 11. An optical disc for recording data on the optical disc based on the clock by means of detecting an address bit signal from an optical disc having wobbles with address pits and means for generating a clock synchronized with the wobble. The recording device includes means for detecting an address and a parity for the address from the address bit signal, and the number of times of mismatch between the address and the expected value of the address within a certain number of times of address detection exceeds a predetermined threshold value. In this case, an optical disk recording device characterized by interrupting recording on the optical disk. 12. The number of times of exceeding the predetermined phase shift range according to claim 7, the number of times of not being detected within the window of claim 8, and the outside of the window of claim 9. And the number of times of the parity check error according to claim 10, and
The recording onto the optical disc is interrupted when the total number of times of combination among the number of times of mismatch between the address and the expected value of the address value according to claim 11 exceeds a predetermined threshold value. Optical disc recording device. 13. The optical disk recording apparatus according to claim 1, wherein the position at which the recording is interrupted is a time when it is determined that the threshold value has been exceeded. 14. The optical disk recording apparatus according to claim 1, wherein the position at which the recording is interrupted is a predetermined boundary between data recording units on the disk. 15. The optical disk recording apparatus according to claim 1, wherein the position at which the recording is interrupted is a time point when the recording of a predetermined data recording unit is completed. 16. The dummy data is recorded up to the position where the recording is interrupted when the recording of all the data in the data recording unit is completed first at the position where the recording is interrupted. The optical disk recording device according to claim 14. 17. The recording according to any one of claims 1 to 12, after the recording is interrupted, the clock is resynchronized with the data signal before the data recording unit in which the recording is interrupted, or the recording is interrupted. 13. The optical disk recording apparatus according to claim 1, wherein the recording operation is restarted from the recorded data recording unit. 18. The method according to claim 1, wherein after the recording is interrupted, resynchronization of the clock with the data signal is performed, and the data recording unit next to the data recording unit in which the synchronization deviation is detected is detected. 13. The optical disk recording apparatus according to claim 1, wherein the recording operation is restarted from the beginning. 19. A data recording unit that exceeds the threshold value when the recording operation is restarted by resynchronizing the clock with the data signal after interrupting the recording according to any one of claims 1 to 12. 13. The optical disk recording apparatus according to claim 1, wherein in the area, the clock is not synchronized with the data synchronization signal and the phase synchronized by the immediately preceding data recording unit area is held. .