JP2002298361A - Method for controlling recording of optical disk recording playback device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/playback device in which a signal is recordable on the disk with laser beams irradiated from an optical pickup. SOLUTION: In the optical disk recording/reproducing device constituted so that the signal recorded before the recording operation is interrupted is reproduced after the recording operation is interrupted and the recording operation is restarted based on this reproduced signal, the interruption and restart of the recording operation are carried out when a constant angular velocity recording operation is in progress, and the recording characteristics of the recorded signal is detected which is to be reproduced at the time of interruption and restart of the recording operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Disk players for reading signals recorded on a disk using an optical pickup have become widespread, but recently, in addition to a reproducing function, a laser element incorporated in the optical pickup has been developed. 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 light beam irradiated from the optical disk has been commercialized.

[0003]

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

In a state where the signal recording operation to the disk is normally performed, the recording signal output from the computer device is written to the buffer RAM, the signal is read from the buffer RAM, and the signal is read. The operation of recording the output signal on the disk is performed according to the amount of the recording signal and the state of recording on the disk.

In a state where the signal recording operation is being performed, if the amount of the recording signal stored in the buffer RAM is insufficient, the signal recording operation on the disk cannot be performed, that is, a so-called buffer underrun situation occurs. .
As a method for solving such a problem, when the amount of the recording signal stored in the buffer RAM becomes a predetermined value, that is, when the interruption setting value or less, the recording operation on the disk is temporarily stopped,
When the amount of recording signals stored in the buffer RAM becomes larger than a predetermined value, that is, a restart setting value, a technique for restarting the recording operation on the disk has been developed.

As a method of solving the buffer underrun problem, there is a method of performing a recording interruption operation and a recording restart operation. In the recording restart operation, a signal recorded on a disk is reproduced before the recording is interrupted, and the reproduction is performed. The recording operation is restarted based on the received signal.

The recording operation on the disk in the optical disk recording / reproducing apparatus is performed at a constant linear velocity. When the disk is driven to rotate at a constant linear velocity, the inner peripheral side of the disk is closer to the outer peripheral side. The rotation angular velocity of the disk becomes higher than that. Therefore, it is difficult to drive the disk from the inner circumference to the outer circumference at a constant high linear velocity.

As a method for solving such a problem, a technique has been developed which performs a recording operation in a state where the angular velocity is constant. When performing a recording operation at a constant angular velocity, the linear velocity at the recording position becomes higher as the recording position moves toward the outer periphery of the disc. The control operation for improving the recording characteristics in is performed. However, it was not possible to detect whether or not the recording operation was performed normally until the recording operation was completed. Some optical disk recording / reproducing devices are configured to perform not only a recording operation with a constant angular velocity but also a plurality of recording operations with a constant linear velocity.

An object of the present invention is to provide a recording control method suitable for the above-described optical disk recording / reproducing apparatus.

[0010]

According to the present invention, there is provided an optical disc recording / reproducing apparatus configured to reproduce a signal recorded before a recording operation is interrupted after a recording operation is interrupted and restart a recording operation based on the reproduced signal. When a recording operation is performed at a constant angular velocity, a recording interruption / resuming operation is performed, and the recording characteristic of a recorded signal reproduced when the recording interruption / resuming operation is performed is detected.

[0011]

FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a disk mounted on a turntable (not shown) driven to rotate by a spindle motor M, and is configured to be driven to rotate by rotation of the turntable. Also. Position information data is recorded on the disc 1 by a groove called a wobble, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove. A laser element (not shown) 2 for irradiating the disk 1 with a light beam and a monitoring diode for monitoring the level of the light beam radiated from the laser element are incorporated and are reflected from the signal surface of the disk 1. An optical pickup incorporating a light detector for receiving a light beam, and a pickup feed motor (not shown)
Thus, the disk 1 can be moved in the radial direction.

Reference numeral 3 denotes an RF signal amplifying circuit that amplifies an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shapes the waveform, and 4 denotes a signal obtained through the RF signal amplifying circuit 3. A pickup control circuit for performing a focusing control operation for focusing a light beam output from the optical pickup 2 on the signal surface of the disk 1 based on the signal beam and a tracking control operation for causing the light beam to follow a signal track on the signal surface. , A focus servo circuit and a tracking servo circuit.

Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplifier circuit 3 and performs demodulation operations of various signals, and 6 denotes a digital signal processed by the digital signal processing circuit 5. A signal reproducing circuit to which a signal is input. When the information recorded on the disc 1 is an audio signal, the signal is converted into an analog signal and then output to an amplifier or the like, and when the data signal is data such as computer software. Has an operation of outputting a 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 a 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 designates a recording signal such as a test signal or an information signal, and controls a laser irradiation operation by a laser driving circuit 10 in accordance with the signal, thereby transmitting a data signal or the like to the disk 1.
Is a signal recording circuit for recording a signal.

Reference numeral 11 denotes a buffer RAM in which a signal to be recorded on the disk 1 is temporarily stored, in which a signal output from the computer 7 is written, and a signal is stored and read out by a control operation of the system control circuit 8. The operation is configured to be controlled. The signal stored in the buffer RAM 11 is
After being read out to be recorded on the disk 1, it is in a state of being stored and held, and thereafter, a new signal output from the computer device 7 is stored at that position and is sequentially overwritten and erased. . Reference numeral 12 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, which has a function of rotationally controlling a spindle motor M for rotationally driving the disk 1 at a speed for performing a recording / reproducing operation. . The rotation control operation of the spindle motor M by the spindle motor drive circuit 12 is configured to perform not only the drive control operation at a constant angular velocity but also the drive control operation at a plurality of constant linear velocities.

In such a configuration, during a signal recording operation on the disk 1, a signal output from the computer device 7 is stored in the buffer RAM 11, and the read operation of the stored signal is controlled to control the disk operation. 1 is configured to control the operation of recording a signal into the first signal. When the recording operation is resumed after the signal recording operation on the disk 1 is interrupted, the signal stored in the buffer RAM 11 and the signal recorded on the disk 1 before the interruption are resumed. The comparison operation is performed so that the signal is recorded continuously to the signal recorded before the interruption, that is, the signal is recorded in a method called seamless.

Also, while the signal recording operation on the disk 1 is being performed, the final address of the position where the normal recording operation was performed is stored in the memory circuit provided in the system control circuit 8. It is configured. During a recording operation, a buffer underrun state occurs in which the amount of recording signals stored in the buffer RAM is insufficient, and when the recording operation is interrupted, the recording is interrupted based on the last address stored in the memory circuit. It is configured such that a signal can be recorded seamlessly from the position.

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. A system control circuit 8 that constitutes a drive device from a computer device 7
When a command signal for performing a reproducing operation is output to the system controller 8, 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

When the control operation for the reproduction operation is started, the rotation control operation of the spindle motor M by the spindle motor drive circuit 12 is performed. The rotation control operation of the spindle motor decodes the wobble signal. The disk 1 is rotated at a constant linear velocity by comparing the synchronization signal obtained as described above with a reference signal output from a reference signal generation circuit (not shown). The rotation control operation at a constant linear velocity is performed using a synchronization signal, whereas the rotation control operation at a constant angular velocity is performed using a signal generated by rotation of the spindle motor M. The rotation control operation is also performed at the time of a signal recording operation described later.

The rotation control operation of the spindle motor is performed as described above. In the optical pickup 2 which performs a signal readout operation, a focusing control operation and a tracking control operation are started, and the optical pickup 2 is started.
, The reading operation of the signal from the disc 1 is started. Before the reproducing operation, the reading operation of the TOC data recorded in the lead-in area constituting the first session of the disc 1 is performed.

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 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 applied to a signal reproduction circuit 6 after signal processing such as error correction is performed.

When the information data read from the disk 1 is an audio signal, the signal reproducing circuit 6 converts the data into an analog signal and outputs the analog signal to an amplifier or the like. In this case, the digital signal is output to the computer 7 as it is. As described above, the reproducing operation in the present embodiment is performed, but the rotation speed control operation of the disk is performed at a constant angular velocity when performing the reproducing operation at a constant angular velocity, and is performed when the reproducing operation is performed at a constant linear velocity. Is performed at a constant linear velocity and a constant multiple of a predetermined multiple of the linear velocity.

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.

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 in the disk 1. Will be Such a setting operation is performed by recording a test signal while changing the laser output and reproducing the recorded signal.

When such a laser output setting operation is performed, an operation of reading out information data recorded in an area called a buffer of the disk 1, ie, position information of a signal recorded in a signal recording area, is performed. . Based on the information data thus read out, it is determined whether or not the data signal can be recorded in the signal recording area provided on the disk 1 and where the recording operation is to be performed. The operation is performed.

When the recognition processing operation is completed, the optical pickup 2 is moved to a position where the recording operation on the disk 1 is started, and the recording signal is written into the buffer RAM 11. RA for the buffer
When a signal writing operation to 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, and the read signal is input to the signal recording circuit 9. As a result, the control operation of the laser drive circuit 10 by the signal recording circuit 9 is performed, and a signal is recorded on the disk 1.

By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer RAM 11 is performed according to a signal reading operation from the buffer RAM 11. Have been. Then, in a state where the recording operation is normally performed, an operation for storing an address indicating the position, that is, a final address in the memory circuit is performed each time a signal recording operation on the disk 1 is performed.

In the state where the signal is recorded on the disk 1, the amount of the signal output from the computer device 7 and written into the buffer RAM 11 is the amount of the signal read out to be recorded on the disk 1. , The amount of the recording signal 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 occurs, a control operation for interrupting the recording operation on the disk 1 is performed. When such an interruption operation is performed, the operation of reading the signal from the buffer RAM 11 is also interrupted.

In this state, when a recording signal is output from the computer device 7, a control operation of writing the recording signal into the buffer RAM 11 is performed, and the recording signal stored in the buffer RAM 11 is controlled. Will gradually increase. 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 resuming 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 was interrupted, and then the reproducing operation is performed from that position. Done by The position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time a normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.

The signal reproduced by the reproduction operation is a signal recorded immediately before the recording operation is interrupted, and the comparison operation between the reproduction signal and the signal stored and held in the buffer RAM 11 is performed. Do. When it is determined by the comparison operation that the two signals are the same signal, the reading of the signal stored in the buffer RAM 11 and stored subsequent to the signal subjected to the above-described comparison operation is performed. The operation is performed, and the read signal is input to the signal recording circuit 9 to start the signal recording operation on the disk 1. By the above-described operation, the recording interruption operation and the recording resuming operation of the signal on the disk 1 can be performed, and by performing such operations, the signal is continuously recorded on the disk 1 despite the interruption of the recording operation. A recording operation, that is, a so-called seamless recording operation can be performed.

As described above, the signal recording operation in this embodiment is performed. Next, the gist of the present invention will be described.

When the amount of signals stored in the buffer RAM 11 becomes insufficient, that is, when a buffer underrun occurs, the recording interruption operation and the recording restart operation are performed as described above. The operation is
This is performed based on a reproduction operation of a signal recorded on the disk 1. The present invention is configured such that, when a signal reproduced by this reproducing operation, that is, a signal recorded on the disk 1 before recording is interrupted, the recording characteristics of the reproduced signal are detected.

Such a recording characteristic detecting operation can be performed by detecting jitter or a change in a predetermined recording characteristic from a reproduced signal. Then, based on the detected change in the recording characteristics, it is possible to detect the recording characteristics of the signal recorded before the interruption of the recording, and whether the recording operation is normally performed based on the detected characteristics, It is possible to determine whether the recording quality is good.

If it is determined by the operation for detecting the recording characteristics that the recording characteristics are so poor that the signal reproducing operation cannot be performed, an operation of interrupting the recording operation is performed. Then, when it is determined that the recording characteristic is degraded from the optimum characteristic, the recording operation such as laser output for performing the recording operation is changed, and then the recording restart operation is performed. . By performing such an operation of changing the recording conditions, it is possible to maintain good continuity of signals recorded by the recording interruption / restart operation.

The operation described above is a recording control method associated with the occurrence of a buffer underrun. Next, the recording control method of the present invention will be described. The present invention is configured such that in a state where a recording operation is being performed at a constant angular velocity, when the recording position moves to a predetermined position, the recording interruption / restart operation is performed regardless of the occurrence of the buffer underrun described above. ing. Even when such a recording interruption / resumption operation is performed, an operation of detecting a recording characteristic of a signal recorded on the disk 1 before the recording interruption from the reproduced signal is performed. Then, when it is determined by the operation for detecting the recording characteristics that the recording characteristics are so poor that the signal reproducing operation cannot be performed, an operation for terminating the recording operation is performed.

When it is determined that the recording characteristics are worse than the optimum characteristics, the recording condition such as the laser output for performing the recording operation is changed and then the recording restart operation is performed. Have been. By performing such an operation of changing the recording conditions, it is possible to maintain good continuity of signals recorded by the recording interruption / restart operation. Then, the recording speed at the time of resuming the recording is set based on the detected quality of the recording characteristics.

That is, when it is determined that the detected recording characteristic is better than the predetermined characteristic, a control operation for restarting the recording operation at the same constant angular velocity as at the time of interruption is performed. If it is determined that the detected recording characteristic is worse than the predetermined characteristic, a control operation is performed to change to a state in which the recording operation is performed at a constant angular velocity one step lower than the angular velocity at the time of interruption.

When the above-described recording operation at a constant angular velocity is performed, the timing for performing the recording interruption / resuming operation is set by mechanically detecting the recording position, or by using time information reproduced from the disk 1. You can also do it. Further, in a state where the recording operation is being performed, the linear velocity at the recording position is detected, and the recording interruption / resuming operation is performed when the recording linear velocity reaches a predetermined multiple of the prescribed linear velocity. I can do it.

The recording control operation described above is an operation in the case where the recording operation is performed in a state where the angular velocity is constant. Next, the recording operation can be performed not only with the constant angular velocity but also with a plurality of constant linear velocities. A recording control method in the optical disk recording / reproducing apparatus configured as described above will be described.

When the recording operation is performed at a constant angular velocity, the above-described recording interruption operation is performed, and the recording characteristic is detected by reproducing the recorded signal. If the deterioration of the recording characteristics is detected, the linear velocity of the disk 1 is further increased at a position on the outer peripheral side of the position, so that it can be inferred that the recording characteristics are further deteriorated.

In this case, the case where the angular velocity is reduced has been described in the above-described recording control method. However, the state where the recording operation is performed at a constant linear velocity rather than the state where the recording operation is performed at a constant angular velocity. Switch to. Then, the linear velocity set in this case is set to a linear velocity lower than the linear velocity at the position where the recording interruption operation was performed. By performing such a switching operation, the recording operation on the outer peripheral side of the recording interruption position is performed with the set linear velocity constant.

As described above, in the recording state in which the angular velocity is constant, when the deterioration of the recording characteristic is detected, the recording operation is switched to the state in which the recording operation with the constant linear velocity is performed. In the case where the recording is performed when the linear velocity reaches a predetermined multiple of the linear velocity, the recording resume operation is performed by switching to a state where the recording operation is performed at a constant linear velocity one step lower than the linear velocity at the recording interruption position. Will be In this case, the recording operation is performed at a constant linear velocity one step slower than the linear velocity at which the recording characteristics have deteriorated, so that the recording operation with good recording characteristics can be performed.

[0044]

According to the present invention, an optical disk recording / reproducing apparatus configured to reproduce a signal recorded before a recording operation is interrupted after a recording operation is interrupted and to resume a recording operation based on the reproduced signal. In the recording operation with constant angular velocity, the recording interruption / resuming operation is performed, and the recording characteristic of the recorded signal reproduced when performing the recording interruption / resuming operation is detected. This has a great effect when performing.

Further, according to the present invention, the recording conditions at the time of resuming the recording are set based on the detected recording characteristics. Therefore, the recording operation can be resumed under good recording conditions. It can be good.

According to the present invention, the angular velocity at the time of resuming the recording is set based on the detected recording characteristic, so that the deterioration of the recording characteristic can be prevented.

Further, according to the present invention, when the linear velocity at the recording position reaches a predetermined multiple of the prescribed linear velocity, the recording interruption / restart operation is performed. By setting, the recording characteristic detecting operation can be easily performed.

The present invention is configured so that a recording operation with a constant angular velocity and a recording operation with a plurality of constant linear velocities can be performed, and a signal recorded after the recording operation was interrupted and before the recording was interrupted. In the optical disc recording / reproducing apparatus configured to reproduce the data and resume the recording operation based on the reproduced signal, when the recording operation is performed at a constant angular velocity, the recording interruption / resuming operation is performed, and the recording interruption / resuming operation is performed. When the recording characteristic of the recorded signal to be reproduced is detected, and it is determined that the recording characteristic is degraded, the recording operation is switched to a state in which the recording operation is performed at a constant linear velocity lower than the linear velocity at the interruption position. Since the recording operation is restarted, not only can the recording characteristics be prevented from deteriorating, but also the recording operation on the outer peripheral side from the recording interruption position. It can be carried out in stable characteristics.

Further, according to the present invention, when the linear velocity at the recording position reaches a predetermined multiple of the prescribed linear velocity, the recording interruption operation is performed and the linear velocity one step lower than the linear velocity at the time of the recording interruption is performed. Since the recording operation is restarted by switching to a state in which the recording operation is performed at a constant level, a recording operation with good recording characteristics 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.

[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 11 buffer RAM 12 spindle motor drive circuit

Claims (6)

[Claims] 1. An optical disk recording / reproducing apparatus configured to reproduce a signal recorded before a recording operation is interrupted after a recording operation is interrupted and restart a recording operation based on the reproduced signal. Recording operation of an optical disc recording / reproducing apparatus, wherein a recording interruption / resumption operation is performed when a recording operation is performed, and a recording characteristic of a recorded signal reproduced when the recording interruption / resumption operation is performed. Control method. 2. The recording control method according to claim 1, wherein a recording condition for resuming recording is set based on the detected recording characteristics. 3. The recording control method according to claim 1, wherein an angular velocity at the time of resuming recording is set based on the detected recording characteristics. 4. The recording control method according to claim 1, wherein when the linear velocity at the recording position reaches a predetermined multiple of a specified linear velocity, the recording interruption / restart operation is performed. 5. A recording apparatus which is configured to perform a recording operation at a constant angular velocity and a recording operation at a plurality of constant linear velocities, and reproduce a signal recorded before the interruption of the recording after the interruption of the recording operation. In an optical disc recording / reproducing apparatus configured to restart a recording operation based on the reproduced signal, when performing a recording operation at a constant angular velocity, performing a recording interruption / resuming operation, and performing a recording interruption / resuming operation. The recording characteristics of the recorded signal to be reproduced are detected, and when it is determined that the recording characteristics have deteriorated, the recording operation is switched to a state in which the recording operation is performed at a constant linear velocity lower than the linear velocity at the interruption position, and the recording operation is resumed. A recording control method for an optical disk recording / reproducing apparatus, characterized in that the recording control method is performed. 6. When a linear velocity at a recording position reaches a predetermined multiple of a prescribed linear velocity, a recording interruption operation is performed and a recording operation is performed at a constant linear velocity one step lower than the linear velocity at the time of recording interruption. 6. The recording control method according to claim 5, wherein the recording operation is restarted by switching to a state in which recording is performed.