JP2002222561A - Method for controlling recording of optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device which can record signals on a disk with a laser beam emitted from an optical pickup. SOLUTION: The optical disk recording and reproducing device is constituted so that, when a signal is being recorded on a disk by reading the signal once stored into a buffer RAM and the recording of the signal to the disk is being performed, the recording of the signal to the disk is interrupted by judging that the buffer underrun where the amount of the signal stored into a buffer RAM becomes insufficient occurs and the recording of the signal to the disk is resumed when the amount of the signal stored into the buffer RAM reaches a prescribed amount. When the recording operation is interrupted in the midst of a recording operation with a constant angular velocity, recording is resumed by switching into a state of constant linear velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus configured to record a signal on a disk by a laser radiated from an optical pickup and to reproduce a signal recorded on the disk by the laser. About.

[0002]

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

Recently, a disk is controlled to rotate at a constant high linear velocity such as 2, 4, 6, 8, 10, or 12 times the prescribed recording linear velocity. An optical disk recording / reproducing apparatus configured to record a signal has been developed. In order to perform a recording operation while controlling the rotation speed of the disk at a constant linear velocity, it is necessary to accurately perform the rotation control operation of the spindle motor M, and there is a limit to further increasing the linear velocity. There is. Therefore, recently, a technique has been developed in which the recording speed is increased by performing a recording operation in a state where the disk is rotated at a constant angular velocity.

[0004]

The 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. Is temporarily stored in a buffer RAM, and a signal stored in the buffer RAM is read to perform a signal recording operation on a disk.

In a state where the signal recording operation to the disk is performed normally, 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 such a recording state, if the operation of writing the signal to the buffer RAM is delayed as compared with the operation of recording the signal to the disk, the amount of the signal stored in the buffer RAM becomes insufficient. The signal recording operation is interrupted. Such a state is generally called a buffer underrun, and occurs as the rotational speed of the disk on which the recording operation is performed is increased.

In order to solve such a problem, when a buffer underrun condition occurs, the operation of recording a signal on a disk is temporarily interrupted, the operation of writing a signal to a buffer RAM is performed, and the stored signal is stored. A technique has been developed to restart the recording operation of a signal on a disk when the amount of data reaches a predetermined amount. Such a resuming operation of the recording operation is performed by performing an operation of setting the recording start position of the signal to the interrupted position or a processing operation of controlling the signal to be recorded to be continuous with the signal recorded before the interruption. Done.

When a recording operation is performed at a constant angular velocity, the recording speed increases as the recording position moves toward the outer periphery. Therefore, when the buffer underrun occurs, the buffer underrun frequently occurs as the position moves to the outer peripheral side from the position, and the recording interruption / restart operation is repeatedly performed. As a result, there is a problem that the recording time cannot be shortened even if the recording operation is performed at a high angular speed by performing the recording operation at a constant angular velocity.

An object of the present invention is to provide a recording control method for an optical disk recording / reproducing apparatus which solves such a problem.

[0009]

According to the present invention, the signal stored in the buffer RAM is recorded by reading out the signal once stored in the buffer RAM and recording the signal on the disk when the signal is recorded on the disk. The operation of recording a signal to the disk is interrupted by determining that a buffer underrun in which the amount of the buffer is insufficient occurs, and when the amount of the signal stored in the buffer RAM reaches a predetermined amount, In an optical disc recording / reproducing apparatus configured to restart a signal recording operation, when a recording operation is performed at a constant angular velocity, the recording operation is switched to a constant linear velocity when the recording operation is interrupted. It is configured to perform a restart operation.

[0010]

FIG. 1 is a flowchart showing a recording control method according to the present invention, and FIG. 2 is a block circuit diagram showing one embodiment of an optical disk recording / reproducing apparatus according to the present invention.

In FIG. 2, reference numeral 1 denotes a spindle motor M
The disk is mounted on a turntable (not shown) that is driven to rotate by the rotary table, 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. Reference numeral 2 denotes a laser diode for irradiating the disk 1 with a light beam and a monitoring diode for monitoring light emitted from the laser diode, and a photodetector for receiving the light beam reflected from the signal surface of the disk 1. The optical pickup is incorporated therein, and is configured to be moved in the radial direction of the disc 1 by a pickup feed motor (not shown).

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 of 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 based on the focus servo. A circuit and a tracking servo circuit are incorporated.

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 the function of outputting the digital signal as it is to the computer device 7 provided as a host.

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 denotes a recording signal, such as a test signal or an information signal, which is input and controls a laser irradiation operation by a laser driving circuit (not shown) in accordance with the signal, thereby recording a data signal or the like on the disk 1. This is a signal recording circuit.

Reference numeral 10 denotes a buffer RAM 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 reading operation by a control operation of the system control circuit 8. The operation is configured to be controlled. Reference numeral 11 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8,
Has the function of rotationally controlling the spindle motor M for rotationally driving the spindle motor M. The rotation drive control operation by the spindle motor drive circuit 11 is performed in a state where the linear velocity is constant, such as twice, four times, six times, eight times, and twelve times the prescribed velocity as well as the prescribed linear velocity. , And can be rotated at a plurality of constant angular velocities.

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 RAM 10, 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 amount of the signal stored in the buffer RAM 10 becomes smaller than a predetermined amount, that is, when the buffer underrun occurs, the operation of recording the signal on the disk 1 is interrupted, and the output from the computer 7 is output. When the amount of the signal stored in the buffer RAM 10 increases to a predetermined amount by the operation of writing the signal to be written to the buffer RAM 10, the disk 1
It is configured to perform a control operation for restarting the operation of recording a signal to the.

Such a recording restart operation is performed by the buffer R
A comparison operation is performed between the signal stored in the AM 10 and the signal recorded on the disk 1 before the interruption, so that the signal is recorded continuously to the signal recorded before the interruption, that is, called seamless. It is configured to record signals in a system.

Further, the present invention is configured so that the recording operation on the disk 1 can be performed not only at a constant linear velocity but also at a constant angular velocity. Then, when it is determined that a buffer underrun occurs, the control operation for interrupting the recording and resuming the recording is performed during both the constant linear velocity recording operation and the constant angular velocity recording operation. Then, as described later, in a recording state where the angular velocity is constant, when it is determined that a buffer underrun occurs and a recording interruption operation is performed, the recording is performed by a recording operation with a constant linear velocity lower than the velocity at that position. The switching control operation for restarting the operation is performed.

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, the laser diode incorporated in the optical pickup 2 is supplied with a driving current for obtaining a laser output for performing a signal reading operation from a laser driving circuit. Is set.

When the control operation for such a reproduction operation is started, the rotation control operation of the spindle motor M by the spindle motor drive circuit 11 is performed. The disk 1 is rotated at a constant linear velocity by comparing a synchronization signal obtained by decoding with a reference signal output from a reference signal generation circuit (not shown). Such a control operation is similarly performed at the time of a signal recording operation described later. In addition, when performing a reproducing operation at a constant angular velocity, the spindle motor M is rotationally driven and controlled so as to have a set angular velocity. This control operation is also performed at the time of a signal recording operation described later.

The rotation control operation of the spindle motor M is as follows.
As described above, in the optical pickup 2 performing the signal reading operation, the focusing control operation and the tracking control operation are started, and the signal reading operation from the disk 1 by the optical pickup 2 is started. Prior to the reproduction operation, the TOC recorded in the lead-in area constituting the first session of the disc 1
A data read operation is performed.

The operation of reading and reproducing the signal recorded in the signal recording area of the first session provided 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 information 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 this embodiment is performed. Next, the operation of recording a signal on the disk 1 will be described.

The operation of recording a signal on the disk 1 is performed by first recording and reproducing a test signal in a test writing area provided on the disk 1 so that a drive current for obtaining a laser output optimal for the recording operation is supplied to the laser diode. Set to be supplied. 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, that is, position information of a signal recorded in a signal recording area is performed.

Based on the information data read in this manner, whether a data signal recording operation can be performed in a signal recording area provided on the disk 1, and where the recording operation is to be performed are determined. A recognition operation is performed.

When the recognition processing operation is completed, the optical pickup 2 is moved to the position where the recording operation on the disk 1 is started, and at the same time, the operation of writing the recording signal to the buffer RAM 10 is performed. RA for the buffer
When the operation of writing a signal to M10 is performed, the storage amount of the signal stored in the buffer RAM 10 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 10 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 by the signal recording circuit 9 is performed, and a signal is recorded on the disk 1.

The signal recording operation to the disk 1 is performed by such an operation, but the signal writing operation to the buffer RAM 10 is performed as a normal operation.
It is configured to be performed in response to a signal read operation from the AM 10. In the operation of writing a signal to the buffer RAM 10, when a signal read operation is performed, an operation of newly writing a signal at a position where the read signal is stored is repeatedly performed.

If the signal recording operation on the disk 1 is faster than the signal writing operation on the buffer RAM 10, the amount of signals stored in the buffer RAM 10 decreases. The recording operation cannot be performed, that is, a state called a buffer underrun occurs. In the present invention, when the amount decreases to a predetermined amount, a control operation for interrupting the recording operation of the signal to the disk 1 is performed. Will be done. In the state where the recording operation is interrupted in this manner, the computer device 7
When the operation of outputting the recording signal to the buffer RAM 10 is performed, the amount of the signal stored in the buffer RAM 10 gradually increases.

The amount of signals stored in the buffer RAM 10 increases, and when the amount reaches a predetermined amount, a control operation for restarting the operation of recording signals on the disk 1 is performed. Such a control operation is started by first displacing the optical pickup 2 to a position where a recording operation is started, that is, a position retracted from a position where the recording operation is interrupted, and performing a reproduction operation from that position.

The signal reproduced by the reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and the signal stored in the buffer RAM 10 is performed. 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 10 and subsequently to the signal subjected to the comparison operation is performed. When the operation is performed, the signal is input to the signal recording circuit 9 and the operation of recording the signal on the disk 1 is started. By the above-described operation, an operation of interrupting recording of a signal on the disk 1 and an operation of resuming recording can be performed. By performing such an operation, a signal is continuously written 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 control operation when the signal output from the computer device 7 is insufficient, that is, the operation of interrupting the recording of the signal on the disk 1 and the operation of resuming the recording, are performed. This is performed not only at the time of the recording operation at the constant speed but also at the time of the recording operation at the constant angular speed.

In a recording operation at a high speed, for example, at a constant linear speed of 16 times the specified linear speed, it is difficult to accurately perform the rotation drive control operation of the spindle motor M. The recording operation can be performed at a constant linear velocity. When the signal recording operation is performed at a higher speed, the operation is set to be performed at a constant angular velocity.

In the recording operation at a constant angular velocity, the rotational speed increases as the recording position moves from the inner peripheral side to the outer peripheral side, so that the recording speed on the disc 1 gradually increases. Therefore, when a buffer underrun occurs, the number of times that the buffer underrun occurs gradually increases even if the recording operation is restarted after the recording operation is interrupted. As a result, even if the speed of the recording operation is increased by the recording operation with the constant angular velocity, the recording time cannot be reduced. The present invention improves on such a point,
The recording control method of the present invention will be described with reference to FIG.

An instruction signal for performing a recording operation at a constant angular velocity is sent from a computer device 7 to a system control circuit 8.
Is output, the control operation for performing the recording operation at a constant angular velocity is started, and the recording operation is performed at a constant angular velocity (step A). In such a recording operation state, the amount of the signal stored in the buffer RAM 10 is always detected, and it is determined whether or not a buffer underrun occurs based on the amount of the signal (step B).

If it is determined in step B that the buffer underrun does not occur, it is determined whether or not the recording operation has ended (step C). If it is determined in step C that the recording is not to be ended, the recording operation in step A is continuously performed. If it is determined in step C that the recording has been completed, a control operation for terminating the recording operation is performed (step D).

If the buffer underrun does not occur in step B, the recording operation is performed as described above. Next, the operation when the buffer underrun occurs will be described. If it is determined in step B that a buffer underrun occurs, the recording operation on the disk 1 is interrupted, and the recording operation is switched from a recording operation with a constant angular velocity to a recording operation with a constant linear velocity (step E).

When the switching operation is performed, the spindle motor M is controlled by the spindle motor drive circuit 11 to control the spindle motor M to be driven at a constant linear velocity. The linear velocity is set to be lower than the velocity at the position where the recording operation is interrupted when recording is performed at a constant angular velocity. When such a speed control method is switched from the constant angular velocity to the constant linear velocity, it is determined whether or not the rotation speed has stabilized at the constant linear velocity (step F).

If it is determined in step F that the rotational speed has been stabilized at the set linear velocity, the signal recorded on the disk 1 before the interruption is read out and the signal is recorded continuously to the signal. (Step G). While performing such a control operation, the buffer R
It is determined whether the amount of the signal stored in the AM 10 has reached a predetermined amount, that is, an amount capable of starting the recording operation (step H). When it is determined in step H that the amount of the signal stored in the buffer RAM 10 has reached the predetermined amount, the recording operation on the disk 1 is restarted (step I). The recording operation is resumed in this manner, but such recording operation is performed at a constant linear velocity, and the signal recorded on the disc 1 is continuous with the signal recorded before the interruption. Will be recorded.
Further, in such a recording operation state at a constant linear velocity,
When a buffer underrun occurs, the above-described recording interruption operation and recording restart operation are performed.

When it is determined that a buffer underrun occurs while the recording operation is being performed at a constant angular velocity, the recording operation is interrupted and then resumed at a constant linear velocity. However, if the linear velocity is set to the linear velocity closest to the velocity at the interruption position at the time of recording interruption, the recording operation can be performed efficiently.

[0041]

According to the present invention, when a signal once stored in the buffer RAM is read out to record the signal on the disk and the signal is recorded on the disk, the signal is stored in the buffer RAM. The signal recording operation to the disk is interrupted by judging that a buffer underrun in which the amount of the signal is insufficient occurs, and when the amount of the signal stored in the buffer RAM reaches a predetermined amount, the disk In an optical disc recording / reproducing apparatus configured to restart the recording operation of the signal to the optical disk, when the recording operation is performed at the constant angular velocity, the recording operation is switched to the constant linear velocity when the recording operation is interrupted. When the buffer underrun occurs while performing the recording operation at a constant angular velocity, Since been able to reduce the number of times a buffer underrun occurs later, it is possible to perform the recording operation efficiently.

In the present invention, the linear velocity at the time of resuming recording is set to a linear velocity lower than the velocity at the recording position at the time of interruption of recording, so that the number of times of occurrence of buffer underrun can be reduced.

In the present invention, the linear velocity at the time of resuming the recording is set to the linear velocity closest to the velocity at the recording position at the time of the interruption of the recording, so that the recording operation can be performed most efficiently.

Further, according to the present invention, when the rotational speed of the disk is stabilized at a constant linear velocity and the amount of the signal stored in the buffer RAM reaches a predetermined amount, the signal recording operation on the disk is performed. Since the recording operation is restarted, the recording operation can be started accurately.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a recording control method of the present invention.

FIG. 2 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 10 buffer RAM 11 spindle motor drive circuit

Claims (4)

[Claims] 1. A signal stored in a buffer RAM when a signal once stored in a buffer RAM is read to record the signal on a disk and a signal is recorded on the disk. The recording operation of the signal to the disk is interrupted by judging that the buffer underrun in which the shortage occurs occurs, and when the amount of the signal stored in the buffer RAM reaches a predetermined amount, the signal to the disk is In an optical disc recording / reproducing apparatus configured to restart a recording operation, when a recording operation is performed at a constant angular velocity, the recording operation is switched to a constant linear velocity when the recording operation is interrupted. A recording control method for an optical disk recording / reproducing apparatus, characterized by performing the following. 2. The recording control method according to claim 1, wherein the linear velocity at the time of resuming recording is set to a linear velocity equal to or lower than the velocity at the recording position at the time of recording interruption. 3. The recording control method according to claim 2, wherein the linear velocity closest to the velocity at the recording position when the recording is interrupted is set. 4. A recording operation of a signal on a disk is resumed when a rotation speed of the disk is stabilized at a constant linear velocity and a signal amount stored in a buffer RAM reaches a predetermined amount. 2. The recording control method according to claim 1, wherein: