JP2004288274A - Recording control method of optical disk recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording control method of an optical disk recording and reproducing device which can record a signal on a disk. <P>SOLUTION: An error of a disk signal recorded previously on a disk 1 is detected during a recording operation. When a set number of blocks in which errors are detected are detected continuously, the operation of receiving a signal transmitted from a host device is stopped, and the address data indicating the head position of an error start block in which an error is first detected is stored. When it is judged that abnormal recording is caused by abnormal detecting, the recording of the disk 1 is stopped, and when the device is restored to a state in which normal recording can be performed, restart of the recording is controlled on the basis of the stored address data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disc recording device configured to record a signal on a disc by a light beam emitted from a laser element incorporated in an optical pickup and to perform a reproducing operation of a signal recorded on the disc by the light beam. It relates to a playback device.
[0002]
[Prior art]
2. Description of the Related Art Disk players that read signals recorded on a disk using an optical pickup have become widespread, but recently, in addition to a reproducing function, light emitted from a laser element incorporated in the optical pickup has been used. 2. Description of the Related Art An optical disk recording / reproducing apparatus configured to be able to record a signal on a disk by a beam has been commercialized.
[0003]
The recording disk is provided with a groove called a pre-groove, and time information, that is, a disk address can be obtained by demodulating a wobble signal obtained from the pre-groove. The time information recorded by the wobble signal obtained from the pregroove is called ADIP (Address in Pre-groove).
[0004]
The recording operation in the optical disk recording / reproducing apparatus is performed by searching a recording position of a signal by a disk address which is an ADIP obtained from the disk and adding a data address matched with the address to data which is a recording signal. It is configured to record a signal at a position.
[0005]
An optical disk recording / reproducing device called a DVD is configured to perform a signal recording operation on a disk in accordance with a recording command from a computer device as a host device. Such a recording operation is performed in units of one block called an ECC. (For example, see Patent Document 1).
[0006]
[Patent Document 1]
JP, 2002-313027, A
[Problems to be solved by the invention]
The optical disk recording / reproducing apparatus includes a memory called a buffer for temporarily storing a signal transmitted from the host device, reads the signal from the buffer memory, and converts the read signal into a format corresponding to the disk standard. It is configured to perform encoding processing for recording.
[0008]
Further, the recording operation in the optical disk recording / reproducing apparatus is performed while performing a reading operation of a disk address signal obtained from the disk. However, the reading of the disk signal is affected by a change in output of laser light emitted from the optical pickup and jitter. Operation may not be performed properly. Even if the reading operation of the disk signal cannot be performed normally, the recording operation on the disk can be performed, but the recording operation may not be performed normally.
[0009]
Since the optical disk recording / reproducing apparatus has an error correction function as is well known, even if the recording operation cannot be performed normally, the reproduction operation can be performed normally within the error-correctable range, so that there is no problem. However, if a track jump or the like occurs due to an external impact or the like, the recording operation on the disc cannot be performed within a correctable range, so that the recording operation is stopped. When a recording error occurs, it is possible to repair the disk by rewriting the signal in the abnormal recording part of the disk, but the signal stored in the buffer memory where the signal transmitted from the host device is temporarily stored is However, since the data is overwritten and erased by a signal transmitted after the recording operation, there is a problem that the recording operation for correction cannot be performed quickly.
[0010]
An object of the present invention is to provide a recording control method capable of solving such a problem.
[0011]
[Action]
The present invention relates to an optical disk recording / reproducing apparatus comprising a buffer memory for temporarily storing a signal transmitted from a host device, and recording a signal read from the buffer memory on a disk in block units. The device detects an error in the disk signal recorded in advance on the disk during the recording operation, and stops the operation of receiving the signal transmitted from the host device when the set number of blocks in which the error is detected are detected continuously. At the same time, the address data indicating the start position of the error occurrence start block in which the error was first detected is stored, and when it is determined that the recording is in an abnormal recording state by the abnormality detection operation, the recording operation on the disc is stopped and the normal recording operation is performed. When it returns to the state where it can be performed, the data is recorded based on the stored address data. It is configured to control the restarting operation of the operation.
[0012]
【Example】
FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention, and FIG. 2 is a diagram for explaining the operation of the present invention.
[0013]
In FIG. 1, reference numeral 1 denotes a disk which is driven to rotate by a spindle motor (not shown). Position information data is recorded in a groove called a pre-groove, and a signal is recorded based on an ADIP signal obtained from the groove. The reproducing operation is performed. Reference numeral 2 incorporates a laser element (not shown) for irradiating the disk 1 with a light beam and a monitoring diode for monitoring the level of the light beam emitted from the laser element, and is reflected from the signal surface of the disk 1. The optical pickup incorporates a photodetector for receiving a light beam, and is configured to be moved in the radial direction of the disc 1 by a pickup feed motor (not shown).
[0014]
Reference numeral 3 denotes an RF signal amplifying circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shaping the waveform, and reference numeral 4 denotes a RF signal amplifying circuit obtained from the photodetector incorporated in the optical pickup 2. A pickup control circuit for performing a focusing control operation for focusing a light beam output from the optical pickup 2 on a signal surface of the disk 1 based on a signal and a tracking control operation for following the light beam to a signal track on the signal surface And a focus servo circuit and a tracking servo circuit are incorporated.
[0015]
Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of a signal output from the RF signal amplifying circuit 3 and performs demodulation of various signals, and 6 receives a digital signal processed by the digital signal processing circuit 5. A circuit for reproducing a signal which is converted into an analog signal when the information recorded on the disk 1 is an audio signal and then outputted to an amplifier or the like. The function is to output the signal as it is to the computer device 7 provided as a host device.
[0016]
Reference numeral 8 denotes a system control circuit that receives a signal demodulated by the digital signal processing circuit 5 and performs various control operations according to a command signal output from the computer device 7. Reference numeral 9 denotes a recording signal such as a test signal and an information signal, which is input, encodes the signal, supplies the encoded signal to a laser drive circuit 10, and controls a laser irradiation operation by the laser drive circuit 10 to control a data signal and the like. A signal recording circuit for recording a recording signal on the disk 1.
[0017]
Reference numeral 11 denotes a buffer memory in which a signal recorded on the disk 1 is temporarily stored, in which a signal output from the computer device 7 is written, and a signal writing operation and a signal reading operation are controlled by a control operation of the system control circuit 8. It is configured to be. The signal stored in the buffer memory 11 is in a state of being stored and held even after being read for recording on the disk 1, and a new signal output from the computer device 7 is stored at that position. The data is sequentially overwritten and erased.
[0018]
Reference numeral 12 denotes an address memory circuit for storing an address indicating a recording position when a signal is recorded on the disk 1, and the storage operation is controlled by the system control circuit 8. Reference numeral 13 denotes a disk signal decoding circuit for demodulating an ADIP signal, that is, a disk signal, from the signals obtained from the RF signal amplifier circuit 3, and the demodulated signal is connected so as to be input to the system control circuit 8. . An error detection circuit 14 detects an error of the signal demodulated by the disk signal decoding circuit 13 and outputs the presence or absence of the error to the system control circuit 8.
[0019]
In such a configuration, at the time of the signal recording operation on the disk 1, the signal output from the computer device 7 is stored in the buffer memory 11, and the read operation of the stored signal is controlled to control the signal readout from the disk 1. Is configured to control the signal recording operation.
[0020]
As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the reproducing operation in the circuit configured as described above will be described. When a command signal for performing a reproducing operation is output from the computer device 7 to the system control circuit 8 constituting the drive device, a control operation for the reproducing operation by the system control circuit 8 is started. When such a reproducing operation is performed, a driving current for obtaining a laser output for performing a signal reading operation is supplied from the laser driving circuit 10 to the laser element incorporated in the optical pickup 2. Is set to
[0021]
When the control operation for such a reproduction operation is started, the rotation control operation of the spindle motor is performed. The rotation control operation of the spindle motor is performed using a synchronization signal reproduced from the disk 1. Will be. Such a rotation control operation is similarly performed at the time of a signal recording operation described later.
[0022]
The rotation control operation of the spindle motor is performed as described above. In the optical pickup 2 that performs the signal reading operation, the focusing control operation and the tracking control operation are started, and the signal of the signal from the disk 1 by the optical pickup 2 is started. The reading operation is started, but prior to the reproducing operation, the reading operation of the TOC data recorded in the lead-in area provided on the inner peripheral side of the disk 1 is performed.
[0023]
The reading and reproducing operation of the signal recorded in the signal recording area recorded on the disk 1 is performed based on the TOC data recorded in the lead-in area. The signal read by the optical pickup 2 is amplified and shaped by an RF signal amplifying circuit 3 and then input to a digital signal processing circuit 5 where the signal is demodulated. When signal processing is performed by the digital signal processing circuit 5 to extract information data, the information data is subjected to signal processing such as error correction and then applied to the signal reproduction circuit 6.
[0024]
When the information data read from the disk 1 is an audio signal, the signal reproducing circuit 6 converts the information data into an analog signal and outputs the analog signal to an amplifier or the like. Is output to the computer device 7 as a digital signal.
[0025]
As described above, the reproducing operation in this embodiment is performed. Next, the operation of recording a signal on the disk 1 will be described.
[0026]
In the operation of recording a signal on the disk 1, an operation for setting a laser output most suitable for the characteristics of the disk 1 is performed by first recording a test signal in a test writing area provided on the disk 1. Such a setting operation is performed by recording a test signal while changing the laser output and reproducing the recorded signal, but the operation is well-known and will not be described.
[0027]
When the laser output setting operation is performed, an operation of reading information data recorded in the additional recording management area of the disk 1, that is, position information of a signal recorded in the signal recording area, and the like is performed. Then, based on the information data read in this way, it is recognized whether the recording operation of the data signal is possible in the signal recording area provided in the disk 1 and the position where the recording operation is performed is recognized. The operation is performed.
[0028]
When the recognition processing operation is completed, an operation of moving the optical pickup 2 to a position where a recording operation on the disk 1 is started and an operation of writing a recording signal to the buffer memory 11 are performed. The operation of moving the optical pickup 2 to the recording start position is performed by reading an address signal obtained from an ADIP signal recorded on the disk 1 in advance. The address signal is read while moving the optical pickup 2, and when the address value matches the address of the recording start position, the recording operation on the disk 1 is started.
[0029]
On the other hand, when a signal writing operation to the buffer memory 11 is performed, the storage amount of the signal stored in the buffer memory 11 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer memory 11 is read, and the read signal is input to the signal recording circuit 9. As a result, the encoding operation by the signal recording circuit 9, that is, the signal processing operation of adding an address corresponding to the disk address extracted by the disk signal decoding circuit 13 to the signal and setting the format to a standard is performed. . Then, the recording signal processed in this way is supplied to the laser drive circuit 10, and the signal is recorded on the disk 1 by the optical pickup 2 moved to the recording position.
[0030]
By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer memory 11 is configured to be performed according to a signal reading operation from the buffer memory 11. ing. A buffer area provided in the buffer memory 11, that is, an area in which a recording signal transmitted from the computer device 7 is once written stores a signal corresponding to 200 blocks of a signal in ECC unit which is a recording unit. It is configured as follows.
[0031]
The signal transmitted from the computer device 7 is once recorded in the buffer area of the buffer memory 11 and then read and recorded on the disk 1. The read signal is transmitted from the computer device 7 one after another. It is overwritten and erased by the writing operation of the incoming signal. The recording operation in this embodiment is performed in units of a block called ECC.
[0032]
As described above, the recording operation in this embodiment is performed. Next, the control operation of the present invention will be described. As described above, the recording operation on the disc 1 is recorded in units of blocks called ECC. The recording signal is encoded by the signal recording circuit 9 and recorded on the disc 1. The encoding process is performed by adding address information together with an operation of adding an error correction code to a recording signal. This address information is stored in an ADIP signal which is a disk signal recorded in advance on the disk 1. That is, it is generated based on the disk address extracted by the disk signal decoding circuit 13 and recorded on the disk 1.
[0033]
In a state where such a recording operation is being performed, a disk signal extraction operation is being performed by the disk signal decoding circuit 13, but a detection operation of whether or not the signal reading operation is normally performed is an error detection operation. The state has been performed by the circuit 14, and the detection output has been input to the system control circuit 8.
[0034]
The system control circuit 8 controls the operation of generating address data by an address data generating circuit (not shown) based on the disk signal extracted by the disk signal decoding circuit 13, and stores the generated address data in a signal recording circuit. The control operation for adding to the recording signal in the encoding process of No. 9 is performed. The address data is automatically generated by the address data generation circuit even if the disk signal extracted by the disk signal decoding circuit 13 may not be obtained. There is no problem even if the disk signal from 13 disappears. That is, the address which is a disk signal reproduced from the disk 1 and the address data generated to be added to the recording signal are adjusted and controlled so as to coincide with each other at predetermined time intervals.
[0035]
In the recording operation state, the above-described operation is performed, but the error detection operation of the disk signal by the error detection circuit 14 is always performed. When the error detection circuit 14 detects that an error has occurred in the disk signal, the system control circuit 8 recognizes that an error has occurred in the disk signal. Done in
[0036]
The presence / absence of an error is detected for each block. However, when the state immediately returns from the presence of the error to the state of no error, the recording operation is not affected at all and the recording operation is continued. If the operation for detecting the presence or absence of an error is performed in block units, and the operation for detecting the presence of an error continues for a first set number, for example, 50 blocks in succession, it is predicted that the recording operation is a precursor to an abnormality, A control operation for stopping the reception operation of the signal transmitted from the device 7 is performed.
[0037]
When the control operation for stopping the recording signal receiving operation is performed, the system control circuit 8 outputs a notification signal to the computer device 7 indicating that the receiving operation is stopped. When the computer device 7 receives such a signal, the computer device 7 recognizes that the optical disc recording / reproducing device is not in a state of receiving the signal, and performs a control operation for stopping the transmission operation of the recording signal.
[0038]
When the number of error blocks detected by the error detection circuit 14 continues for the first set number, a control operation for stopping the reception operation of the signal transmitted from the computer device 7 is performed. Reference numeral 11 denotes a state in which a signal received and stored before stopping the receiving operation is stored. Therefore, even if the error detection operation is continuously performed for the first set number of blocks and the signal reception operation is stopped, the recording operation on the disk 1 is performed without interruption.
[0039]
As described above, when the number of error blocks detected by the error detection circuit 14 continues for the first set number, the operation of receiving the signal transmitted from the computer device 7 is stopped, but the signal is stored in the buffer memory 11. By performing the signal reading operation, the signal recording operation on the disk 1 is maintained. In such a state, the disk signal extracted by the disk signal decoding circuit 13 has an error in the first set number of blocks continuously, and there is no error before the number of blocks reaches the second set number. , The error detection circuit 14 outputs an error-free detection signal to the system control circuit 8.
[0040]
When such a signal is input, the system control circuit 8 outputs to the computer device 7 a signal indicating that the signal can be received, and outputs the signal to the next area of the signal stored in the buffer memory 11 before the reception was interrupted. Performs a control operation for writing a signal to the. When such an operation is performed, an operation of transmitting a signal following the signal transmitted from the computer device 7 before the interruption of recording to the optical disk recording / reproducing device is performed. The signal transmitted from the computer device 7 is written into the buffer memory 11 by the memory control operation of the system control circuit 8 in the area next to the signal stored before the reception was interrupted.
[0041]
While such an operation is being performed, the recording operation on the disk 1 is being performed, and the recording operation on the disk 1 is continuously performed with the restart of the receiving operation of the signal transmitted from the computer device 7. become.
[0042]
As described above, the signal reception stop operation when the number of error blocks detected by the error detection circuit 14 is the first set number continues and before the number of continuously detected error blocks reaches the second set number. The operation in the case where the error disappears is performed. Next, the case where the error detection operation is continuously performed until the second set number is reached will be described.
[0043]
The second set number is the number of blocks that can be stored in the buffer memory 11 when the reception stop operation is performed, that is, 200. That is, as described above, after the signal receiving operation is stopped by detecting 50 blocks which are the first set number of error blocks continuously, the signal of 150 blocks which is the unrecorded signal stored in the buffer memory 11 is output. Is performed, there is no signal to be recorded on the disk 1. Therefore, in such a case, the control operation for stopping the recording operation is performed by the system control circuit 8.
[0044]
As described above, the recording control operation according to the present invention is performed. Next, the gist of the present invention will be described with reference to FIG.
[0045]
In FIG. 2, an error of the disk signal is detected by the error detection circuit 14 from the block indicated by 1B, an error is continuously detected until a block indicated by 50B, and an error is further detected by blocks indicated by 51B and 52B. The case where it is determined that the recording operation cannot be performed at the position due to a track jump or the like will be described.
[0046]
The determination operation and the detection operation that the recording operation cannot be performed normally due to the influence of the track jump can be performed by monitoring the tracking servo operation by the pickup control circuit 4. For example, the level of the servo error signal is detected, and when the level exceeds a set level, it can be determined that a state in which a normal recording operation cannot be performed is established.
[0047]
In such a case, if it is detected that the block has an error up to the block indicated by 50B, the operation of stopping the reception of the signal transmitted from the computer device 7 and the operation of notifying the computer device 7 of the reception failure are performed as described above. However, the address data indicating the start position of the error occurrence start block 1B where the error is first detected, that is, the position of the point E, is stored and held in the address memory circuit 12. Since it is determined that the recording operation cannot be performed normally, a control operation for stopping the recording operation on the disk 1 is performed. When the control operation for stopping the recording operation is performed, the buffer memory 11 stores the signal before the reception operation is stopped from the signal recorded on the disk 1 before the error occurrence start block 1B. The stored signal is in a state of being stored and held. That is, since signals for 200 blocks can be stored in the buffer area of the buffer memory 11, signals for 200 blocks, which are signals recorded on the disk 1 until the recording operation is stopped, and of course 52 The signal including the signal for the block is stored and held. Further, the address memory circuit 12 is in a state where address data indicating the head position E of the error occurrence start block 1B is stored and held.
[0048]
The recording operation is temporarily stopped by the control operation described above. After the stop operation is performed, the system control circuit 8 performs a control operation for returning to a state where a normal recording operation is performed. In this operation, the rotation control operation of the spindle motor, the focusing control operation and the tracking control operation by the pickup control circuit 4 are performed, and the position of the optical pickup 2 is moved back by a predetermined block, for example, 10 blocks, from the error occurrence start block 1B. The operation of moving to the position is performed.
[0049]
The optical pickup 2 is displaced to a position retracted by 10 blocks from the error occurrence start block 1B, and then a reproducing operation is performed from that position to extract a synchronizing signal from a reproduced signal and perform a signal recording operation. Is performed in synchronization with the recording clock signal. When such an operation is performed, the control operation of the optical pickup 2 by the pickup control circuit 4 is performed. Therefore, the recording operation is performed by the operation of determining whether the servo operation is performed normally and the error detection operation by the error detection circuit 14. An operation of determining whether or not the operation can be performed normally can be performed.
[0050]
If it is determined that the recording operation can be performed normally by such a determination operation, a control operation for starting the recording operation from a position two blocks backward from the error occurrence start block 1B is performed. That is, in FIG. 2, the operation of starting the recording operation from the block 2A is performed.
[0051]
The recording operation is started by such a control operation, and the recording operation is performed from blocks 2A to 1A, 1B, 2B, 3B and so on. The signals recorded in the blocks 2A to 1A, 1B, 2B, 3B and so on are the signals stored and held in the buffer memory 11, that is, the signals recorded on the disk 1 before the recording was interrupted. When the recording operation is started, a signal transmitted from the computer device 7 is received and a notification signal for enabling the signal transmission operation to the computer device 7 is output.
[0052]
As a result of the above operation, the operation of transmitting the recording signal from the computer device 7 is resumed, the operation of receiving the signal is performed, and the operation of writing the received signal to the buffer memory 11 is performed. The operation is performed so as to continue to the position where the previously received signal was recorded.
[0053]
As described above, as a result of restarting the recording operation, the same signal is overwritten on the signals recorded in blocks 2A to 1A, 1B, 2B, 3B to 52B. Accordingly, the signal recorded in the block in which the error is detected by the error detection circuit 14, that is, the block in which it is unknown whether or not the recording operation is normally performed, is rewritten. In this case, the recording signal recorded in the block can be restored. Further, since the recording operation is started from a position two blocks backward from the error occurrence start block 1B, the recording characteristic deteriorates like the block recorded immediately before the error occurrence start block 1B where the error was detected. It is possible to perform an operation of restoring a recording signal recorded in a block that is considered to be in the state.
[0054]
【The invention's effect】
The present invention relates to an optical disk recording / reproducing apparatus comprising a buffer memory for temporarily storing a signal transmitted from a host device, and recording a signal read from the buffer memory on a disk in block units. The device detects an error in the disk signal pre-recorded on the disk during the recording operation, and stops the operation of receiving the signal transmitted from the host device when the set number of blocks in which the error is detected are continuously detected. At the same time, the address data indicating the start position of the error occurrence start block in which the error was first detected is stored, and when it is determined that the recording is in an abnormal recording state by the abnormality detection operation, the recording operation on the disc is stopped and the normal recording operation is performed. When it returns to the state where it can be performed, the data is recorded based on the stored address data. Since so as to control the restarting operation of the operation can be performed repair operation of the recording signal.
[0055]
Further, according to the present invention, since the recording operation is restarted from a position which is retracted by a predetermined number of blocks from the error occurrence start block, it is possible to perform a correcting operation of a block which is highly likely to be abnormally recorded, thereby improving reliability. High recording operation can be performed.
[0056]
Then, according to the present invention, since the same signal as the signal recorded before the stop of recording is recorded in the same location, it is possible to perform a correction operation on a block which is likely to be abnormally recorded, A highly reliable recording operation can be performed.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention.
FIG. 2 is a diagram for explaining a recording control method of the present invention.
[Explanation of symbols]
Reference Signs List 1 disc 2 optical pickup 4 pickup control circuit 5 digital signal processing circuit 7 computer device 8 system control circuit 9 signal recording circuit 10 laser drive circuit 11 buffer memory 12 address memory circuit 13 disk signal decode circuit 14 error detection circuit

Claims (4)

In an optical disc recording / reproducing apparatus, the apparatus includes a buffer memory for temporarily storing a signal transmitted from a host device and is configured to record a signal read from the buffer memory on a disk in block units. During operation, an error of a disk signal recorded in advance on the disk is detected, and when a set number of blocks in which the error is detected are continuously detected, the receiving operation of the signal transmitted from the host device is stopped and the operation is stopped first. Address data indicating the head position of the error occurrence start block where the error was detected is stored, and when it is determined by the error detection operation that an abnormal recording state is set, the recording operation on the disc is stopped and the normal recording operation is performed. When it returns to a state where it can be performed, the recording operation is restarted based on the stored address data. Recording control method of the optical disc recording and reproducing apparatus is characterized in that so as to control the operation 2. The recording control method according to claim 1, wherein the recording operation is restarted from a position retreated by a predetermined number of blocks from the error occurrence start block. 3. The recording control method according to claim 2, wherein the same signal as the signal recorded before the stop of recording is recorded at the same location. 2. The recording control method according to claim 1, wherein when the recording operation is restarted, the receiving operation of the signal transmitted from the host device is restarted.

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