JP2003123385A - Method for controlling recording on optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling recording on an optical disk recording and reproducing device which is so composed that a signal is recorded on a disk with laser light radiated from an optical pickup. SOLUTION: The method is so composed that an interrupted recording due to a shock is restarted from the interruption position of recording, and a subcode buffer memory 14 which stores a prescribed number of subcodes generated by a subcode generation circuit 13 is provided. The subcode read out of the subcode buffer memory 14 and a signal which is processed by being encoded are combined to restart the recording operation to the disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records a signal on a disc by a light beam emitted from a laser element incorporated in an optical pickup and reproduces a signal recorded on the disc by the light beam. The present invention relates to an optical disc recording / reproducing apparatus configured as described above.

[0002]

2. Description of the Related Art Disc players, which read signals recorded on a disc using an optical pickup, have become widespread, but recently, in addition to a reproducing function, a laser element incorporated in the optical pickup is used. An optical disc recording / reproducing apparatus configured to record a signal on a disc by a light beam emitted from the optical disc has been commercialized.

[0003]

The optical disk recording / reproducing apparatus is configured to perform a signal recording operation in accordance with a recording command from the computer apparatus side which is a host device. Such recording operation is performed on a disk. The signal is temporarily stored in the buffer RAM, and the buffer RAM
The signal recording operation is performed by reading the signal stored in the disc.

When the signal recording operation on the disk is normally performed, the recording signal output from the computer is written into the buffer RAM, the signal is read out from the buffer RAM, and the signal is read. The recording operation of the output signal to the disc is performed according to the amount of the recording signal and the recording condition on the disc.

In the state where the signal recording operation is performed, if the amount of the recording signal stored in the buffer RAM is insufficient, the signal recording operation cannot be performed on the disk, which is a so-called buffer underrun. .
As a method for solving such a problem, when the amount of the recording signal stored in the buffer RAM is equal to or less than a predetermined value, that is, the interruption setting value, the recording operation to the disk is temporarily stopped,
A technique has been developed for restarting the recording operation on the disk when the amount of the recording signal stored in the buffer RAM exceeds a predetermined value, that is, a restart set value.

As a method for solving the problem of buffer underrun, there is a method of performing a recording suspending operation and a recording restarting operation. In the recording restarting operation, a signal recorded on a disk is reproduced before the recording is suspended, and the signal is reproduced. The reference signal included in the signal is synchronized with the recording reference signal, and the recording operation is restarted when the synchronization is performed. However, the recording operation is not immediately restarted when the reference signal and the recording reference signal are synchronized, but the recording operation is restarted when the number of frames forming the recording signal after synchronization reaches a predetermined number. Is configured.

The technique for performing the recording interruption / resumption operation described above is as follows.
Although it was developed to prevent buffer underrun, it is conceivable to use such a technique when the recording operation is interrupted by a shock.

The recording operation in the CD type optical disk recording / reproducing apparatus is configured to encode a recording signal, generate a subcode, and record the signal on the disk by combining these signals. Since the recording suspending / resuming operation performed to prevent the buffer underrun can be arbitrarily set, the subcode generation processing and the encoding processing operation at the time of restarting the recording can be accurately performed. .

In contrast to the recording interruption resuming operation performed to prevent the buffer underrun, the recording interruption operation due to shock cannot be arbitrarily set. When a shock is received during the recording operation, it is determined that the recording operation cannot be performed due to the shock, and the recording interruption operation is performed, but it takes time to perform the interruption operation processing operation. Such time is generally called a time lag, and when the recording operation is restarted, the subcode generation operation needs to be performed in consideration of the time lag. When the subcode is generated at the time of resuming the recording, it takes time to generate the subcode, so that the recording operation cannot be resumed at a good timing.

The present invention is intended to provide a recording control method for an optical disk recording / reproducing apparatus capable of solving such a problem.

[0011]

According to the present invention, when the amount of the signal stored in the buffer RAM in which the recording signal is temporarily stored becomes equal to or less than the interruption set value during the recording operation on the disk, the recording operation on the disk is performed. R for the buffer while interrupting
When the amount of the signal stored in the AM increases to the restart set value, the signal recorded on the disc before the interruption is reproduced, and the recording operation is resumed from the recording interruption position based on the reproduced signal. In the optical disc recording / reproducing apparatus, a recording interruption resuming operation due to a shock can be performed from the recording interruption position, and a subcode buffer memory for storing a predetermined number of subcodes generated by the subcode generation circuit is provided. It is configured to restart the recording operation on the disc by combining the subcode read from the subcode buffer memory and the encoded signal.

[0012]

1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a disk mounted on a turntable (not shown) that is rotationally driven by a spindle motor, and is configured to be rotationally driven by the rotation of the turntable. Also. On the disc 1, position information data is recorded by a groove called a wobble, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. Reference numeral 2 is a laser element (not shown) for irradiating the disk 1 with a light beam, and a monitor diode for monitoring the level of the light beam irradiated by the laser element is incorporated and reflected from the signal surface of the disk 1. An optical pickup with a built-in photodetector that receives a light beam, and a pickup feed motor (not shown)
It is configured so that it can be moved in the radial direction of the disk 1.

Reference numeral 3 is an RF signal amplifier circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and waveform shaping, and reference numeral 4 is a signal obtained through the RF signal amplifier circuit 3. 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 and a tracking control operation for causing the light beam to follow a signal track on the signal surface on the basis of the light beam. , A focus servo circuit and a tracking servo circuit are incorporated.

Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of the signal output from the RF signal amplification circuit 3 and demodulates various signals. Reference numeral 6 denotes a digital signal processed by the digital signal processing circuit 5. This is a signal reproduction circuit to which a signal is input. When the information recorded on the disc 1 is an audio signal, it is converted to an analog signal and then output to an amplifier, etc. Is to output the digital signal as it is to the computer device 7 provided as a host device.

Reference numeral 8 denotes a system control circuit which receives the signal demodulated by the digital signal processing circuit 5 and performs various control operations in accordance with a command signal output from the computer device 7. Reference numeral 9 denotes a recording signal such as a test signal or an information signal which is input, encodes the signal, and generates a recording signal in combination with a sub code described later to control the laser irradiation operation by the laser driving circuit 10. This is a signal recording circuit for recording a data signal and the like on the disk 1 by means of Further, the laser drive circuit 10 incorporates a servo circuit that controls laser output based on a signal obtained from a monitor diode incorporated in the optical pickup 2.

Reference numeral 11 denotes a buffer RAM for temporarily storing the signal recorded on the disk 1, and the signal output from the computer device 7 is written therein and the signal is written and read by the control operation of the system control circuit 8. The operation is configured to be controlled. Then, the signal written in the buffer RAM 11 is in a state of being stored and retained even after being read out for recording on the disk 1, and thereafter, the computer device 7
The new output signal is written to that position so that it is sequentially overwritten and erased.

Reference numeral 12 detects a level change of a servo signal obtained from a servo circuit incorporated in the pickup control circuit 4 and detects whether the level exceeds a predetermined level, that is, an error detection level. It is a shock detection circuit that detects whether or not a shock has been received, and is configured to output a detection output to the system control circuit 8.

Reference numeral 13 is a subcode generating circuit for generating subcodes by the control operation of the system control circuit 8, and the subcodes generated one after another are input to the signal recording circuit 12. . A subcode buffer memory 14 stores subcodes generated by the subcode generation circuit 13, and is configured to store a predetermined number, for example, 10 blocks of subcodes. Such subcode buffer memory 14
The subcode stored in the subcode is the subcode generation circuit 1 described above.
3 is configured to be updated by subcodes generated one after another.

In such a configuration, at the time of recording a signal on the disc 1, the signal output from the computer device 7 is stored in the buffer RAM 11 and the disc is controlled by controlling the read operation of the stored signal. 1 is configured to control the recording operation of the signal to 1. When the recording operation is restarted after the recording operation of the signal on the disc 1 is interrupted, the signal stored and held in the buffer RAM 11 and the signal recorded before the interruption on the disc 1 are recorded. The comparison operation is performed so that the signal is continuously recorded to the signal recorded before the interruption, that is, the signal is recorded by a method called seamless.

Further, during the recording operation of the signal to the disk 1, the final address of the position where the normal recording operation is carried out is stored in the memory circuit provided in the system control circuit 8. It is configured. When the recording operation is interrupted due to an insufficient amount of recording signals stored in the buffer RAM 11 at the time of recording operation and the recording operation is interrupted, it is interrupted based on the final address stored in the memory circuit. The recording operation can be performed seamlessly from the position.

The optical disk recording / reproducing apparatus according to the present invention is constructed as described above. Next, the reproducing operation in the circuit thus constructed will be described. A system control circuit 8 constituting a drive device from the computer device 7
When a command signal for performing the reproducing operation is output to the, the control operation for the reproducing operation by the system control circuit 8 is started. When such a reproducing operation is performed, the laser drive circuit 10 supplies the laser element incorporated in the optical pickup 2 with a drive current for obtaining a laser output for performing a signal read operation. Is set to.

When the control operation for the reproduction operation is started, the spindle motor drive circuit (not shown) performs the rotation control operation of the spindle motor. The rotation control operation of the spindle motor is wobbled. The disk 1 is rotated at a constant linear velocity by comparing a synchronization signal obtained by decoding the signal with a reference signal output from a reference signal generation circuit (not shown) provided in the system control circuit 8. It is done to drive. The rotation control operation of the spindle motor is also performed during the signal recording operation described later.

The rotation control operation of the spindle motor is performed as described above, but in the optical pickup 2 which performs the signal reading operation, the focusing control operation and the tracking control operation by the pickup control circuit 4 are started to cause the optical pickup. Although the signal reading operation from the disc 1 by 2 is started, the TOC data recorded in the lead-in area forming the first session of the disc 1 is read out prior to the reproducing operation.

The reading and reproducing operation of the signal recorded in the signal recording area of the first session recorded on the disc 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 waveform-shaped through the RF signal amplification circuit 3 and then input to the digital signal processing circuit 5 to demodulate the signal. 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 reproducing circuit 6.

When the information data read from the disc 1 is an audio signal, the signal reproduction circuit 6 converts the information data into an analog signal and then outputs the analog signal to a data signal such as computer software. In this case, the digital signal is output to the computer device 7 as it is.

The reproducing operation in this embodiment is performed as described above. Next, the operation of recording a signal on the disc 1 will be described.

The operation of recording a signal on the disk 1 is performed by first recording a test signal in a test writing area provided on the disk 1 to set a laser output most suitable for the characteristics of the disk 1. Be seen. Such a setting operation is performed by recording a test signal and reproducing the recorded signal while changing the laser output, but since such an operation is well known, its description is omitted.

When the laser output setting operation is performed, an operation of reading information data recorded in an area called a buffer of the disk 1, that is, position information of a signal recorded in the signal recording area is performed. . Then, on the basis of the information data thus read, it is possible to recognize whether the recording operation of the data signal can be performed in the signal recording area provided in the disc 1 and where the recording operation is performed. The action is taken.

When the recognition processing operation is completed, the optical pickup 2 is moved to a position on the disk 1 where the recording operation is started, and the recording signal is written in the buffer RAM 11. RA for the buffer
When the signal writing operation to the M11 is performed, the storage amount of the signal stored in the buffer RAM 11 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 11 is read out,
The read signal is input to the signal recording circuit 9. As a result, the signal recording circuit 9 performs the encoding process and the subcode generating circuit 13 performs the subcode generating operation. The signal encoded by the signal recording circuit 9 is combined with the sub-code and output to the laser driving circuit 10. Therefore, the laser driving circuit 10 outputs the optical pickup 2 to the optical pickup 2.
A drive current is supplied to the laser element incorporated in the disk to record a signal on the disk 1.

Although a signal recording operation to the disk 1 is performed by such an operation, a signal writing operation to the buffer RAM 11 is performed according to a signal reading operation from the buffer RAM 11. Has been done. Then, in a state where the recording operation is normally performed, an operation of storing the address indicating the position, that is, the final address in the memory circuit is performed every time the recording operation of the signal to the disk 1 is performed. Also, when the recording operation described above is being performed, the subcode buffer memory 1
In No. 4, the subcode generated by the subcode generation circuit 13 is stored for 10 blocks.

The amount of signal output from the computer device 7 and written in the buffer RAM 11 is the amount of signal read out to be recorded on the disc 1 while the signal recording operation on the disc 1 is being performed. When the number of recording signals is smaller than that of the above, the amount of recording signals stored in the buffer RAM 11 gradually decreases. When the amount of the recording signal stored in the buffer RAM 11 decreases to a predetermined amount, that is, when the buffer underrun state occurs, a control operation for interrupting the recording operation on the disc 1 is performed. When such an interruption operation is performed, the reading operation of the signal from the buffer RAM 11 and the subcode generation operation by the subcode generation circuit 13 are also interrupted.

In this state, when a recording signal is output from the computer device 7, a control operation for writing the recording signal in the buffer RAM 11 is performed, and the recording signal stored in the buffer RAM 11 is performed. The amount of will increase gradually. When the amount of the recording signal stored in the buffer RAM 11 increases and reaches a predetermined amount, a control operation for restarting the recording operation is performed.

In the recording restart operation, first, the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position retracted from the position where the recording operation is interrupted, and then the reproducing operation is performed from that position. Done more. The position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit each time a normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.

The signal reproduced by such a reproducing operation is the signal recorded immediately before the recording operation is interrupted, and the comparison operation between the reproducing signal and the signal stored and held in the buffer RAM 11 is performed. To do. If it is determined by the comparison operation that the both signals are the same signal, the signal stored in the buffer RAM 11 and subsequently to the signal subjected to the comparison operation is read out. The operation is performed, and the subcode generation circuit 13 starts the subcode generation operation. As a result, the signal recording circuit 9 performs the encoding processing operation and the combination processing operation with the sub-code to start the signal recording operation on the disc 1. By the above-described operation, it is possible to perform the recording suspending operation and the recording resuming operation of the signal to the disc 1. By performing such an operation, the disc 1 is continuously supplied with the signal even though the recording operation is suspended. A recording operation, that is, a so-called seamless recording operation can be performed.

As described above, the signal control operation is performed during the recording interruption resuming operation. Next, the control operation for resuming the recording operation from the recording interruption position will be described. Such a control operation performs a read operation of a signal recorded on the disc 1 before the interruption, and detects a reference signal from the read signal. On the other hand, the synchronization processing operation is performed between the recording reference signal generated by the reference signal generation circuit (not shown) and the above-mentioned reference signal, that is, the reference signal obtained from the disc 1. Then, the system control circuit 8 performs an operation of detecting whether or not the two reference signals have been synchronized with the synchronization processing operation.
When the system control circuit 8 detects that the two reference signals are synchronized, the recording operation on the disc 1 is started, and the seamless recording operation described above can be performed.

The recording operation in this embodiment is performed as described above. Next, the gist of the present invention will be described. When the optical disk recording / reproducing apparatus receives a shock from the outside during the recording operation, the level of the tracking servo signal is abnormally increased due to the servo operation by the pickup control circuit 4. Such a signal is called a tracking error signal, and a change in the signal level is detected by the shock detection circuit 12.

When the shock detection circuit 12 detects that the level of the servo signal exceeds the error detection level, the detection output is input to the system control circuit 8. When the detection output from the shock detection circuit 12 is input to the system control circuit 8, the system control circuit 8 determines that the recording operation cannot be continued normally, and interrupts the recording operation. To do.

When the recording interruption operation is performed in this way, a control operation for resuming recording is started. In such a control operation, first, the optical pickup 2 is displaced to a position retracted from the recording interruption position. After that, the reproduction operation is started from that position. Since the position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time the normal recording operation is performed, the optical pickup 2 can be moved to a desired position. Further, when the optical pickup 2 is moved to a desired position, the control operation by the pickup control circuit 4 is performed, and the state where the signal recorded on the disk 1 can be reproduced can be restored.

The signal reproduced by such a reproducing operation is the signal recorded immediately before the recording operation is interrupted, and the comparing operation of the reproducing signal with the signal stored and held in the buffer RAM 11 is performed. To do. If it is determined by the comparison operation that the both signals are the same signal, the signal stored in the buffer RAM 11 and subsequently to the signal subjected to the comparison operation is read out. As the operation is performed, the signal is input to the signal recording circuit 9 to start the signal recording operation on the disc 1. By the above-described operation, it is possible to perform the recording interruption operation and the recording restart operation of the signal to the disc 1, and by performing such an operation, the disc 1
Can perform a so-called seamless recording operation, in which a signal is continuously recorded despite the interruption of the recording operation.

As described above, the recording restart operation is performed when the recording operation is interrupted by the shock,
Next, details of the recording restart operation will be described. When the recording operation is being performed, the disc 1 is combined with the recording signal encoded by the sub-code generation circuit 13.
The subcodes recorded in 1 are sequentially generated and output to the signal recording circuit 9, and are written in the subcode buffer memory 14 to store 10 blocks of subcodes. That is, assuming that the subcode recorded last on the disc 1 is S10, the subcode stored in the subcode buffer memory 14 is the subcode for 10 blocks of S1, S2 to S10.

In such a state, the shock detection circuit 1
When the shock is detected by 2, the system control circuit 8 performs the recording interruption processing operation as described above, and as a result, the recording signal read-out processing operation from the buffer RAM 11 and the encoding processing by the signal recording circuit 9 are stopped. The operation and the sub-code generation circuit 13 performs the sub-code generation operation stop processing operation. When such a stop processing operation is performed, the subcode buffer memory 14 is in a state of storing and holding subblocks of 10 blocks, but by the time the shock is detected, the recording interruption processing operation is performed. There is a time lag, during which the subcode generation circuit 13 generates a subcode following the subcode recorded on the disc 1.

That is, if the recording interruption processing operation is performed due to a shock at the time when the subcode S10 is recorded on the disc 1, it is generated by the subcode generation operation of the subcode generation circuit 13 due to the processing time lag. The subcodes are, for example, S11, S12, and S13, and the generation of the subcodes is stopped at this point. Therefore, in such a state, the subcodes stored in the subcode buffer memory 14 are S4 and S5.
Up to 10 blocks of sub-codes of S10, S11, S12 and S13.

In the state where the recording operation is normally performed,
Since the address indicating the recording position on the disc 1 is stored in the memory circuit incorporated in the system control circuit 8, the sub-record recorded on the disc 1 last by reading the address stored in this memory circuit. The code, that is, S10 can be recognized. Such a subcode recognition operation is performed, and a subcode continuous to the recognized subcode, that is, S11 is generated by the subcode generation circuit 13 and the recording restart operation is performed.
Conventionally, the subcode generated by the subcode generation circuit 13 is S14, so that the signal generation processing operation for generating the subcode S11 is delayed.

In the present invention, since the sub-code S11 used when resuming recording is stored in the sub-code buffer memory 14, the sub-code S11 is read out by the control operation of the system control circuit 8 to record a signal. It is input to the circuit 9 for use. Since the subcode is stored and held in the subcode buffer memory 14 up to S13, the read operation up to S13 is performed, and the subcode generation circuit 13 outputs the subcode S13.
Will be generated from the subcode S14 that follows. The sub-code generation operation by the sub-code generation circuit 13 is performed at the timing of reading the sub-code stored in the sub-code buffer memory 14.

As described above, the subcode used when resuming the recording is generated by reading the subcode stored in the subcode buffer memory 14, so that the recording operation can be resumed at a good timing. . Therefore, even if the recording operation is interrupted by a shock, the recording restart operation can be performed while maintaining the continuity of the recording signal accurately.

[0046]

According to the present invention, when the amount of the signal stored in the buffer RAM in which the recording signal is temporarily stored becomes equal to or less than the interruption set value during the recording operation on the disc, the recording on the disc is performed. When the operation is interrupted and the amount of the signal stored in the buffer RAM is increased to the restart set value, the signal recorded on the disc before the interruption is reproduced, and the recording is started from the recording interruption position based on the reproduced signal. In an optical disk recording / reproducing apparatus configured to restart the operation, a recording interrupt restart operation due to a shock is configured to be performed from the recording interrupt position, and a predetermined number of subcodes generated by the subcode generating circuit are stored. A subcode buffer memory is provided, and the subcode read from the subcode buffer memory is encoded. Since was by combining the signals so as to resume the recording operation to the disk, immediately give it possible sub code used when recording resumes.

Further, according to the present invention, the time lag required for the recording interruption process at the time of the recording interruption due to the shock is detected, and the subcode stored in the subcode buffer memory is selected according to the detected time lag. Accurate recording restart operation can be performed.

Further, according to the present invention, the subcode generation operation by the subcode generation circuit at the time of recording interruption due to shock is interrupted, and the subcode read from the subcode buffer memory by the recording restart operation coincides with the subcode at the time of recording interruption processing. At this time, the subcode generation operation by the subcode generation circuit is started, so that the subcode generation operation of the subcode generation circuit can be efficiently performed.

[Brief description of drawings]

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

[Explanation of symbols]

1 disc 2 Optical pickup 4 Pickup control circuit 5 Digital signal processing circuit 7 Computer equipment 8 system control circuit 9 Signal recording circuit 10 Laser drive circuit 11 Buffer RAM 12 Shock detection circuit 13 Subcode generation circuit 14 subcode buffer memory

Claims (3)

[Claims] 1. A disk recording operation is interrupted when the amount of a signal stored in a buffer RAM for temporarily storing a recording signal is equal to or less than an interruption set value during a disk recording operation. With the buffer RAM
When the amount of the signal stored in the disk has increased to the restart set value, the signal recorded on the disc before the interruption is reproduced, and the recording operation is restarted from the recording interruption position based on the reproduced signal. In the optical disc recording / reproducing apparatus, a recording interruption resuming operation due to a shock can be performed from the recording interruption position, and a subcode buffer memory for storing a predetermined number of subcodes generated by the subcode generation circuit is provided. A recording control method for an optical disk recording / reproducing apparatus, characterized in that a subcode read from a code buffer memory and an encoded signal are combined to restart a recording operation on a disk. 2. The method according to claim 1, wherein a time lag required for the recording interruption process at the time of recording interruption due to a shock is detected, and the subcode stored in the subcode buffer memory is selected according to the detected time lag. The recording control method according to item 1. 3. A subcode when the subcode generation operation by the subcode generation circuit at the time of recording interruption due to shock is interrupted and the subcode read from the subcode buffer memory by the recording restart operation matches the subcode at the time of recording interruption processing. The recording control method according to claim 2, wherein a subcode generation operation by the generation circuit is started.