JPH06267072A - Recording/reproducing apparatus for optical disc - Google Patents

Abstract

PURPOSE:To start writing from a position on a disc by forming data of the write starting time based on the previously obtained ATIP data or subcode data when a predicting ATIP generatirng means or a predicting subcode means detects the abnormality of the demodulated ATIP data or subcode data. CONSTITUTION:When recording of data to an optical disc is to be started, data is started to be written to a write/read device 5 by a controlling circuit 6 only when an ATIP synchronizing signal agrees with a subcode synchronizing signal. If a synchronization disagreement signal is output from a synchronization loss detecting circuit 2 after recording of data is started, the circuit 6 stops writing of data to the device 5. In other words, the circuit, 6 permits writing to the device 5 on tone condition that an abnormal signal is not supplied from a tracking/focusing loss detecting circuit 4 and the circuit 2 before writing of data to an optical disc is started. Even if the ATIP data demodulated by an ATIP demodulation circuit 7 is abnormal, writing is started on the basis of a predecting time signal from arm increment circuit 9 for the abnormal occasion.

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 / reproducing apparatus.

[0002]

2. Description of the Related Art In an optical disk device capable of recording information, if an impact or the like is applied when recording information, tracking may be lost and adjacent tracks may be destroyed. To avoid such a situation, track deviation is detected by monitoring the amplitude of the tracking error signal at the start of writing the information, and when the track deviation occurs at the start of the information writing, the information is recorded on the optical disc. An apparatus for interrupting the above is disclosed in, for example, Japanese Patent Publication No. 2-43256. In addition, in order to enable information to be recorded in a form of being added to this information recording area after information has been recorded once on the optical disc, a new disc on which information has not been recorded yet (hereinafter referred to as a raw disc) is previously recorded. An apparatus for temporally matching the written ATIP synchronization signal with the subcode synchronization signal transmitted from the CD encoder and included in the recording information is disclosed in, for example, Japanese Patent Laid-Open No. 4-6497.
No. 6 publication.

[0003]

However, when the recording operation is interrupted during recording, the configuration of the invention disclosed in the above-mentioned Japanese Patent Laid-Open No. 4-64976 has a true or predicted time at the time of interruption. Since there is no function to retain information, the next recordable time becomes unknown. Also, the above ATI
Even when the P-sync signal and the sub-code sync signal are synchronized, the synchronization may be lost due to, for example, dust or a defect on the optical disc. Therefore, during the time information read / write operation, if the start time attached to the location for writing / reading is searched and the location is reached, but the time information itself is incorrect, the information can be read / written. If there is no track, or if a track is lost before reaching that point even if the point to read / write is detected by information other than the time information, the information is recorded in a location different from the target location, or information is recorded from a different location. Read out. Therefore, it is possible that there is no information to be read during the read operation. The present invention has been made to solve such a problem, and it is possible to start recording from an accurate position when recording information,
Optical disc recording / reproducing, in which the IP sync signal and the subcode sync signal are synchronized with each other, and when a track deviation occurs, the time information thereof can be known, and at the time of reading information, the reading of information from an erroneous position is prevented. The purpose is to provide a device.

[0004]

According to the present invention, there is provided a writing / reading means for writing / reading information to / from an optical disc, and a writing / reading means connected to the output side of the writing / reading means and prewritten on the optical disc. ATIP sync signal detecting means for detecting an ATIP sync signal, a CD coding means for sending a subcode sync signal from before the start of recording of information to the optical disc until the end of recording, the ATIP sync signal detecting means and the CD. An output side of the encoding means is connected, and an ATIP subcode synchronizing means and an ATIP subcode synchronizing means for synchronizing the ATIP synchronizing signal and the subcode synchronizing signal from before the start of recording information to the optical disc until the end of recording. Loss detection means connected to the output side of the device for detecting the loss of synchronization between the ATIP synchronization signal and the subcode synchronization signal. Characterized by comprising a and.

With this configuration, the ATIP subcode synchronization means matches the synchronization between the ATIP synchronization signal and the subcode synchronization signal from the start of recording information to the optical disc until the end of recording, so that recording is started. It acts so as to write highly reliable information conforming to the standards not only at the time but also during recording.

Also, an ATIP demodulating means connected to the output side of the writing / reading means, for performing a demodulating operation of the ATIP signal read from the optical disk, and for judging whether the demodulated ATIP data is normal or not. A predictive ATIP generating means connected to the output side of the ATIP demodulating means, for generating predictive ATIP data based on the ATIP data demodulated last time when the ATIP data demodulated by the ATIP demodulating means is judged to be abnormal; Subcode demodulating means connected to the output side of the writing / reading means, for performing demodulation operation of the subcode signal read from the optical disk, and for determining whether the demodulated subcode data is normal, and the subcode. It is determined that the subcode data connected to the output side of the demodulation means and demodulated by the subcode demodulation means is abnormal. A prediction sub-code generating means for generating a prediction subcode data based on the sub-code data the previously demodulated, is connected to the output side of the write and read means,
An abnormality detecting means for detecting an abnormality before writing information to the optical disc or during writing of information and generating an abnormality detection signal;
Can also be provided.

With such a configuration, the prediction ATIP
The generation means or the prediction subcode generation means is the demodulated A
When it is determined that the TIP data or the subcode data is abnormal, the write start time information is generated based on the ATIP data or the subcode data obtained last time. Therefore, even if the demodulated ATIP data is abnormal, the writing start time information is normal. It acts so that the writing of information can be started from a position on the optical disc.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the optical disk recording / reproducing apparatus of the present invention will be described with reference to FIG. The ATIP sync signal detection circuit 11 connected to the output side of the writing / reading device 5 for writing information to and reading information from the optical disc is included in the information read from the optical disc.
The ATIP sync signal recorded in advance on the optical disc is detected. The output side of such an ATIP sync signal detection circuit 11 is connected to the ATIP subcode sync circuit 1.
ATIP obtained by the writing / reading device 5
(Absolute Time In Pre-groove) signal, ATIP
The ATIP sync signal includes the data and the ATIP sync indicating the delimiter, and the signal obtained by extracting the ATIP sync from the ATIP signal is the ATIP synchronization signal. The ATIP sync signal is a signal output for each sector, which is the minimum unit of time, and is usually called an absolute time in pregroove. In this way, the writing / reading device 5
The ATIP sync signal is sent to the ATIP sync signal detection circuit 11, and the ATIP signal is sent to the ATIP demodulation circuit 7 described later.

On the other hand, when the information is recorded on the optical disc, the output side of the CD encoder 12 which sends the subcode synchronizing signal to be recorded on the optical disc together with the information is also the ATIP.
It is connected to the subcode synchronization circuit 1. When writing the subcode synchronization signal to the optical disc, the synchronization with the ATIP synchronization signal pre-recorded on the optical disc should be maintained.
The ATIP subcode synchronization circuit 1 supplies the ATI supplied from before the recording of information to the optical disc until the end of recording.
The operation for matching the synchronization between the P sync signal and the subcode sync signal is performed.

Such an ATIP subcode synchronizing circuit 1
The output side of EFM (Eight to Fourteen) is based on the out-of-sync detection circuit 2 that detects whether the ATIP sync signal and the subcode sync signal are out of sync, and the synchronized ATIP sync signal and the subcode sync signal. It is connected to the EFM generation circuit 3 that performs the operation of generating a modulated signal. The output side of the out-of-synchronization detection circuit 2 is connected to the control circuit 6, and E
The output side of the FM generating circuit 3 is connected to the input side of the writing / reading device 5.

The output side of the writing / reading device 5 is connected to a track / out-of-focus detection circuit 4 for detecting an out-of-track state and an out-of-focus state based on the track error signal and the focus error signal supplied from the writing / reading circuit 5. To be done. The track / out-of-focus detection circuit 4 detects the out-of-track or the out-of-focus state, and outputs the EF.
A control signal for not performing the M operation is sent to the EFM generating circuit 3. Further, when the track / defocus detection circuit 4 detects the track / defocus, it sends a signal to that effect to the control circuit 6.

The output side of the writing / reading device 5 demodulates the supplied ATIP signal and also demodulates A
The TIP data is connected to an ATIP demodulation circuit 7 that determines whether the TIP data is normal using a known technique, and the output side of the ATIP demodulation circuit 7 is demodulated by the ATIP demodulation circuit 7.
Normal TIP when TIP data is determined to be abnormal
In order to generate the data, for example, it is connected to an abnormal time increment circuit 9 which is a predictive ATIP generating means for generating predictive ATIP data by incrementing the demodulated ATIP data immediately before which is determined to be abnormal by one. .

The output side of the writing / reading device 5 demodulates the supplied subcode signal and determines whether the demodulated subcode data is normal by using a known technique. It is connected to the demodulation circuit 8. The output side of the sub-code demodulation circuit 8 is, for example, one that is determined to be abnormal in order to generate normal sub-code data when the sub-code data demodulated by the sub-code demodulation circuit 8 is determined to be abnormal. Is connected to an abnormal time increment circuit 10 which is a prediction subcode generation means for generating the prediction subcode data by incrementing the demodulated subcode data of 1. The signal sent from the writing / reading device 5 to the subcode demodulation circuit 8 is a subcode signal, and the signal sent from the CD encoder 12 to the ATIP subcode synchronizing circuit 1 is a subcode synchronizing signal.

Regarding the ATIP demodulation circuit 7, the subcode demodulation circuit 8 and the like, when the information is recorded on a certain optical disc for the first time, the ATIP from the writing / reading device 5 is performed.
Only the sync signal is sent out, so in this case ATIP
The demodulation circuit 7 and the abnormal increment circuit 9 operate, while both systems such as the ATIP demodulation circuit 7 and the sub-code demodulation circuit 9 operate when information is already recorded and the recording operation is once stopped. The output side of the above-described abnormal time increment circuits 9 and 10 is connected to the control circuit 6.

Before the start of recording information on the optical disc, the control circuit 6 does not supply a signal indicating that the ATIP sync signal and the subcode sync signal do not match in synchronization from the out-of-sync detection circuit 2. That is, when the ATIP sync signal and the subcode sync signal are synchronized with each other, writing of information to the writing / reading device 5 is started. or,
After the start of recording information on the optical disc, the control circuit 6
Stops the writing of information to the writing / reading device 5 when a signal indicating that the synchronization between the ATIP sync signal and the subcode sync signal does not match is supplied from the out-of-sync detection circuit 2. Further, the control circuit 6 stops the operation of the writing / reading device 5 when a signal indicating that the track is out of focus is supplied from the track / defocus detecting circuit 4.

When seeking several sectors, which is the stage before the start of recording information on the optical disc, the control circuit 6 sets the track / focus defocus detection circuit 4 and the desync detection circuit 2 in the operation prohibition state, and after the seek. Until the start of recording and after the start of writing information to the optical disk, the track / defocus detection circuit 4 or the out-of-sync detection circuit 2 is detected based on an abnormal signal sent by the track / defocus detection circuit 4 or the out-of-sync detection circuit 2. Is set to the operation permission state.

Further, the control circuit 6 writes / reads the read / write device 5 on condition that an abnormal signal is not supplied from the track / out-of-focus detection circuit 4 and the out-of-sync detection circuit 2 before the start of writing information on the optical disk. Is set to the write operation enable state.

Further, the control circuit 6 is based on the predicted time information supplied from the abnormal time increment circuit 9 even when the ATIP data demodulated by the ATIP demodulation circuit 7 is abnormal at the time of starting the writing of information to the optical disc. Then, the writing / reading device 5 starts writing information to the optical disc. Therefore, it is possible to prevent the writing of information to the wrong position on the optical disc.

Further, the control circuit 6 stops the writing of information when an abnormal signal is supplied from the out-of-track / focus detection circuit 4 and the out-of-sync detection circuit 2 after the writing of information to the optical disk is started, and at the same time, The type of anomaly indicated by the anomaly signal, such as a track deviation, and time information supplied from the ATIP demodulation circuit 7 when the anomaly signal is supplied are stored.

Further, when the control circuit 6 confirms the time information of the subcode signal before starting the reading of the information from the optical disk, an abnormal signal is supplied from the track / focus defocus detection circuit 4 and the desync detection circuit 2. On the condition that there is not, the writing / reading device 5 is set to the read operation permitting state.

When the control circuit 6 confirms the time information of the subcode signal before starting the reading of the information from the optical disk, the writing / reading device 5 is based on the estimated time information supplied from the abnormal time increment circuit 10. At, the reading of information from the optical disc is started.

The operation of the optical disk recording / reproducing apparatus of this embodiment having the above-mentioned structure will be described below with reference to FIGS. First, the operation of writing information on the optical disc will be described with reference to FIG. To search the position on the optical disc where information is written (hereinafter referred to as seek),
In step (indicated by S in the figure) 1, the writing / reading device 5 is moved under the control of the control circuit 6, and the writing / reading device 5 writes to the control circuit 6 from, for example, a host computer. Seek is performed from a position on the optical disc where a time earlier than the start time information is recorded. In step 2, after the seek, the control circuit 6
For example, a signal for permitting an operation of detecting an out-of-track is sent to the out-of-focus detection circuit 4. As a result, when the track / focus defocus detection circuit 4 subsequently detects an abnormality such as a track defocus, it sends a signal to that effect to the control circuit 6. During the seek operation, the track / out-of-focus detection circuit 4 is prohibited from detecting an abnormality such as an out-of-track state. Even if an abnormality is detected, a signal to that effect is not sent to the control circuit 6. Since the operation of the track / out-of-focus detection circuit 4 can be permitted or prohibited as described above, the operation state can be set only when necessary.

In addition, since seek is performed, ATIP
The sync signal detection circuit 11 detects an ATIP sync signal from the read information supplied from the writing / reading device 5 and sends it to the ATIP subcode sync circuit 1. On the other hand, the subcode synchronization signal attached to the information to be written on the optical disc is supplied to the ATIP subcode synchronization circuit 1, and in step 3, ATIP
The subcode synchronization circuit 1 matches the synchronization of the ATIP synchronization signal and the subcode synchronization signal. Therefore, after this, A
The synchronization of the TIP sync signal and the subcode sync signal,
The non-coincidence is detected by the out-of-sync detection circuit 2, and the coincidence is detected.
A mismatch signal is sent to the control circuit 6.

Next, at step 4, the ATIP signal sent from the writing / reading device 5 is demodulated by the ATIP demodulation circuit 7, and it is judged by using a known inspection method whether or not the ATIP signal is normally demodulated. If the result of the determination is that the demodulated signal is abnormal, the process proceeds to step 5, and the abnormal time increment circuit 9 demodulates the ATI previously determined to be normal.
Predicted AT by incrementing P data by 1, for example
Generate IP data. When it is judged that the demodulation is normal, the abnormal increment circuit 9 does not operate, and
The demodulated ATIP data transmitted by the TIP demodulation circuit 7 is transmitted as it is.

In step 6, it is judged whether or not the synchronization between the ATIP sync signal before writing and the subcode sync signal is in agreement, and if they are in agreement, the process proceeds to step 8 and if they are not in agreement. The control circuit 6 has step 1
Return the action to. In step 7, if the abnormality is incremented, it is determined whether or not there is abnormality detection data from the track defocus detection circuit 4. If there is abnormality, the procedure returns to step 1, and if there is no abnormality, the procedure proceeds to step 6.

The demodulated ATIP data sent from the abnormal increment circuit 9 in this manner is supplied to the control circuit 6. In step 8, the control circuit 6 controls the demodulated A
It is determined whether the time information based on the TIP data matches the write start time information instructed by the host computer or the like. When it is determined that they do not match, the process returns to step 4 again, and when it is determined that they match, the process proceeds to step 9.

In step 9, the control circuit 6 determines the validity of the time information based on the ATIP data. That is,
The control circuit 6 determines whether the time information supplied from the abnormal time increment circuit 9 is generated by being incremented by the abnormal time increment circuit 9 or is directly supplied from the ATIP demodulation circuit 7. . If the time information is generated by incrementing, the control circuit 6 checks in step 10 whether or not the track / focus is defocused at that time. If an abnormality is detected in this check, the control circuit 6 stores the time information at the time when the abnormality is detected in step 11, and returns the operation to step 1. If it is determined in step 9 that the time information is valid, and if it is determined in step 10 that the track / focus is not defocused, the process proceeds to step 12.

In step 12, it is judged whether or not the synchronization between the ATIP sync signal and the subcode sync signal is the same, and if they are the same, the process proceeds to step 13 and the control circuit 6 causes the write / read device 5 to operate. Instructing to write information to the optical disk, and if they do not match, the control circuit 6 returns the operation to step 11.

After the writing of information is started, in step 14, the ATIP demodulation circuit 7 determines whether the time information based on the demodulated ATIP data is normal, as in the operations in steps 4 and 5 described above. If it is determined to be abnormal, the same operation as that shown in step 5 is performed in step 15 and the process proceeds to steps 16 and 17, and in step 14, the time information based on the ATIP data is determined to be normal. Also in this case, the process proceeds to steps 16 and 17.

In step 16, the control circuit 6 determines whether or not an abnormality such as an out-of-track state is detected by the track / focus defocus detection circuit 4. If an abnormality is detected, the process proceeds to step 18, and if no abnormality is detected, a step is performed. Move to 19. In step 17, the control circuit 6 sets A
Whether or not the TIP sync signal and the subcode sync signal are out of sync is determined by the signal supplied from the out-of-sync detection circuit 2. When the ATIP sync signal and the subcode sync signal are in sync, the process proceeds to step 19. If there is no match, the process proceeds to step 18.

If the abnormality is detected and if the synchronization is not coincident, the control circuit 6 records the time information at the time when the abnormality is detected and the type of the abnormality such as the track deviation in step 18. , Ends the operation. If the above abnormality is not detected, or if there is a match in the above synchronization, step 1
At 9, the current time information is compared with the write end time information instructed by the host computer or the like. If they do not match, the control circuit 6 returns the operation to step 14,
If they match, the writing / reading device 5 is set to end writing.

As described above, in the optical disc recording / reproducing apparatus of this embodiment, the ATIP subcode synchronizing circuit 1 receives the ATIP synchronizing signal and the subcode synchronizing signal not only at the start of writing the information but also during the writing of the information. Since it is determined whether there is a synchronization match of, the error of these matches is ±
It is possible to perform a write operation based on the so-called Orange Book standard, which is defined as a 10 EFM frame.
If the time information based on the demodulated ATIP data is incorrect, the abnormal time increment circuit 9 generates the predicted time information, so that the write operation can be reliably performed. Further, during writing, if an abnormality is detected by the track / defocus detection circuit 4, the writing operation is stopped. Therefore, for example, even when an off-track occurs, it is not possible to write information to the wrong track. Can be prevented. Further, when an abnormality occurs, the time information at the time of occurrence of the abnormality and the type of the abnormality are stored in the control circuit 6. Therefore, when writing is started again, the location of the information where the information was written when the abnormality occurred The following information can be written following the end part.

The information read operation will be described below with reference to FIG. In order to seek the position on the optical disc where the information is read, in step 20, the writing / reading device 5 is moved by the control circuit 6 and the writing / reading device 5 is moved.
Seeks from the portion of the optical disc where time information before the read start time information supplied from the host computer or the like is recorded in the control circuit 6. In step 21, after the seek, the control circuit 6 sends a signal to the track / defocus detection circuit 4 to permit the detection of the track out, for example. As a result, when the track / focus defocus detection circuit 4 subsequently detects an error such as a track defocus, the control circuit 6 sends a signal to that effect.
Send to. During the seek operation, the track / out-of-focus detection circuit 4 is prohibited from detecting an abnormality such as an out-of-track state. Even if an abnormality is detected, a signal to that effect is not sent to the control circuit 6. Since the operation of the track / out-of-focus detection circuit 4 can be permitted or prohibited as described above, the operation state can be set only when necessary.

Next, at step 22, the ATIP signal and the sub-code signal sent from the writing / reading device 5 are demodulated by the ATIP demodulation circuit 7 and the sub-code demodulation circuit 8 and a known check is made. Judgment using the method. If the result of the determination is that the demodulated one is abnormal, the process proceeds to step 23, and the ATIP data and subcode data previously demodulated and determined to be normal by the abnormal increment circuits 9 and 10 are incremented, for example, by one. By doing so, predicted ATIP data and predicted subcode data are generated. When it is determined that the demodulation is normal, the abnormal increment circuits 9 and 10 do not operate, and the demodulated ATIP data and subcode data sent by the ATIP demodulation circuit 7 and the subcode demodulation circuit 8 are sent as they are.

In step 24, if the abnormality is incremented, it is judged whether or not there is an abnormality detected by the track defocus detection circuit 4, and if there is an abnormality, step 2
Return to 0, and if there is no abnormality, move to step 25.

The demodulated ATIP data and the demodulated subcode data sent from the abnormal increment circuits 9 and 10 in this manner are supplied to the control circuit 6. Step two
At 5, the control circuit 6 determines whether the time information based on the demodulated ATIP data and subcode data matches the read start time information instructed by the host computer or the like. When it is determined that they do not match, the process returns to step 22 again, and when it is determined that they match, the process proceeds to step 26.

In step 26, the validity of the time information based on the ATIP data and the subcode data is verified by the control circuit 6.
Will be judged by. That is, the abnormal increment circuit 9,
The control circuit determines whether the above-mentioned two pieces of time information supplied from 10 are generated by being incremented by the abnormal time increment circuits 9 and 10, or are directly supplied from the ATIP demodulation circuit 7 and the sub-code demodulation circuit 8. It is judged at 6. If the time information is generated by incrementing, the control circuit 6 checks in step 27 whether or not the track / focus is out of focus up to that point. If an abnormality is detected in this check, the control circuit 6 stores the time information at the time when the abnormality is detected in step 28, and returns the operation to step 20 again. If it is determined in step 26 that the time information is valid, and if it is determined in step 27 that the track / focus is not defocused,
Go to step 29.

In step 29, the control circuit 6 instructs the writing / reading device 5 to read information from the optical disc.

After the reading of the information is started, the ATIP demodulation circuit 7 and the sub-code demodulation circuit 8 in step 30 operate on the demodulated ATIP data and the sub-code data in the same manner as the operations in steps 22 and 23 described above. When it is determined whether the time information is normal, and when it is determined that the time information is abnormal, the same operation as the operation shown in step 23 is performed in step 31, and then the process proceeds to step 32.
When it is determined in step 30 that the time information of the ATIP data and the subcode data is normal, the process also goes to step 32.

In step 32, the current time information is compared with the read end time information instructed by the host computer or the like, and if they do not match, the control circuit 6 returns the operation to step 30, and if they match, Sets the read / write device 5 to end reading.

As described above, in the optical disc recording / reproducing apparatus of the present embodiment, when the time information based on the demodulated ATIP data and the subcode data is erroneous at the start of reading and during reading, it is incremented at abnormal time. By generating the predicted time information in the circuits 9 and 10, it is possible to prevent the read operation from the wrong position. Further, if an abnormality is detected by the track / focus defocus detection circuit 4 during reading, the reading operation can be stopped.

[0042]

As described above in detail, according to the present invention, the ATIP sync signal and the subcode sync signal are synchronized even during the recording of information on the optical disk. It is possible to write highly reliable information conforming to the standard even during recording.

Further, when it is judged that the demodulated ATIP data or subcode data is abnormal, the write start time information is generated based on the ATIP data or subcode data obtained last time, so that it is demodulated. ATI
It is possible to start writing information from a position on the optical disk that would be normal even when P data or subcode data is abnormal.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an optical disc recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart showing a write operation of the optical disc recording / reproducing apparatus shown in FIG.

FIG. 3 is a flowchart showing a read operation of the optical disc recording / reproducing apparatus shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... ATIP subcode synchronization circuit, 2 ... out-of-sync detection circuit, 3 ... EFM generation circuit, 4 ... track / focus defocus detection circuit, 5 ... write / read device, 6 ... control circuit, 7 ... A
TIP demodulation circuit, 8 ... Subcode demodulation circuit, 9, 10 ...
Abnormality increment circuit, 11 ... ATIP sync signal detection circuit, 12 ... CD encoder.

Claims (11)

[Claims] 1. A read / write means for writing / reading information to / from an optical disk, and an ATI connected to the output side of the write / read means for detecting an ATIP sync signal pre-written on the optical disk.
The P synchronization signal detecting means, the CD encoding means for transmitting the subcode synchronization signal from the start of recording information to the optical disc until the end of recording, the ATIP synchronization signal detecting means and the output side of the CD encoding means are connected. Between the start of recording information on the optical disc and the end of recording, an ATIP subcode synchronizing means for synchronizing the ATIP synchronizing signal and the subcode synchronizing signal, and an output side of the ATIP subcode synchronizing means,
An optical disk recording / reproducing apparatus comprising: an out-of-sync detecting means for detecting an out-of-sync between the ATIP sync signal and the subcode sync signal. 2. The output side of the writing / reading means is connected,
ATIP demodulation means for performing a demodulation operation of the ATIP signal read from the optical disc and for judging whether the demodulated ATIP data is normal, and an ATIP demodulation means connected to the output side of the ATIP demodulation means,
When it is judged that the ATIP data demodulated by the P demodulating means is abnormal, the predictive ATIP generating means for generating the predictive ATIP data based on the ATIP data demodulated last time, and the output side of the writing / reading means are connected to the optical disc. Connected to the output side of the sub-code demodulating means for performing the demodulating operation of the sub-code signal read from the sub-code signal and determining whether the demodulated sub-code data is normal, When the sub-code data demodulated by the demodulating means is determined to be abnormal, the predictive sub-code generating means for generating the predictive sub-code data based on the previously demodulated sub-code data is connected to the output side of the writing / reading means. And an abnormality detection means for generating an abnormality detection signal by detecting an abnormality before or during writing of information on the optical disc. Equipped with, the optical disk recording and reproducing apparatus according to claim 1. 3. The ATIP sync signal and the sub-code sync signal are synchronized with each other before being connected to the output side of the out-of-sync detecting means and before the writing of information from the out-of-sync detecting means to the optical disc is started. 2. The optical disk recording / reproducing apparatus according to claim 1, further comprising control means for starting the writing of information to said writing / reading means only when a signal to the effect is supplied. 4. The control means, in addition to the above operation, outputs a signal indicating that the ATIP synchronization signal and the subcode synchronization signal are out of synchronization from the out-of-synchronization detection means after the writing of information to the optical disc is started. 4. The optical disc recording / reproducing apparatus according to claim 3, wherein writing of information to said writing / reading means is stopped when supplied. 5. Before starting the writing of information on the optical disc, when at least the time information sent by the ATIP demodulating means or the sub-code demodulating means does not match the instructed write start time information during the seek operation. The abnormality detecting means and the out-of-synchronization detecting means are prohibited from operating, and the abnormality detecting means is based on an abnormality signal sent by the abnormality detecting means or the out-of-synchronization detecting means before or during writing of information to the optical disc. 5. The optical disk recording / reproducing apparatus according to claim 4, further comprising control means for setting the out-of-synchronization detection means in an operation permitting state. 6. The optical disk recording / reproducing apparatus according to claim 5, wherein the control means sets the write operation permission state after completion of the seek operation before starting the writing of information on the optical disk. 7. The control means starts writing information to the optical disc by the writing and reading means based on the estimated time information supplied from the predicted ATIP generating means when starting writing information to the optical disc. The optical disc recording / reproducing apparatus according to claim 6. 8. The control means causes the writing / reading means to stop writing information when an abnormality signal is supplied from the abnormality detecting means and the out-of-synchronization detecting means after the writing of information to the optical disc is started. The optical disc recording / reproducing apparatus according to claim 7, wherein the abnormal signal and the time information supplied from the ATIP demodulating means are stored together with the abnormal signal. 9. The control means permits the read operation on condition that the abnormality signal is not supplied from the abnormality detecting means when confirming the time information of the subcode signal before starting the reading of the information from the optical disk. The optical disc recording / reproducing apparatus according to claim 2, which generates an operation signal for setting a state. 10. The control means, when confirming the time information of the subcode signal before starting the reading of the information from the optical disk, based on the predicted time information supplied from the predicted subcode generation means, the write / read operation. 10. The optical disc recording / reproducing apparatus according to claim 9, wherein the means starts reading information from the optical disc. 11. The optical disc recording according to claim 4, wherein the abnormality detection means generates the abnormality detection signal based on a track error signal and a focus error signal supplied from the writing / reading means. Playback device.