JP2001014798A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device configured so as to record signals on a disk via a beam of laser irradiated by an optical pickup. SOLUTION: In an optical disk recording and reproducing device configured so as to record a signal on a disk 1 by reading a signal which is once stored, at a specified speed and a speed several times as high as the specified speed, when a signal recording operation is interrupted due to the lack of a signal storage capacity stored in RAM 10 for a buffer during recording operation onto the disk 1 at a high speed, the recording operation is re-started by changing over the rotating speed of the disk 1 to a lower speed side.

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.

In recent years, it has been difficult to record a signal while controlling the rotation of the disk at a constant high linear velocity of 2 times, 4 times, 6 times, and 8 times the prescribed recording linear velocity. An optical disk recording / reproducing device configured to be capable of being developed has been developed.

[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.

Further, when a signal recording operation on a disk is performed at a speed several times higher than a prescribed speed, the amount of a signal to be written is insufficient for the amount of a signal read from a buffer RAM. In such a case,
An operation of interrupting the recording operation of the signal on the disk and restarting the operation of recording the signal on the disk when the amount of the signal stored in the buffer RAM reaches a predetermined amount is performed. According to such a configuration, even if the amount of signals stored in the buffer RAM is insufficient, the processing operation can be performed. However, when a large-capacity signal is to be recorded, the above-described recording interruption and recording restart The operation will be repeated. As a result, there is a problem that the recording time becomes long despite the high-speed recording operation.

An object of the present invention is to provide an optical disk recording / reproducing apparatus which can solve such a problem.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a signal is stored on a disk at a specified speed and at a speed several times higher than the specified speed, and by reading a signal once stored in a buffer RAM. In an optical disk recording / reproducing apparatus configured to record, when a signal recording operation to a disk is performed at a high speed, a signal recording operation to the disk is performed due to a lack of capacity of a signal stored in the buffer RAM. When the recording is interrupted, the rotation speed of the disk is changed to a lower speed, and the recording operation is restarted.

[0009]

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 (not shown), 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. This is an optical pickup 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 amplification circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical pickup 2 and shaping the waveform, and 4 denotes a signal obtained through the RF signal amplification circuit 3. A pickup control circuit for performing focusing control for focusing a light beam of the optical pickup 2 on a signal surface of the disk 1 and tracking control for following the light beam to a signal track on the signal surface based on the focus servo circuit and A tracking servo circuit is incorporated.

Reference numeral 5 denotes a digital signal processing circuit which 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 7 is written, and a signal is stored and read out by a control operation of a system control circuit 8. The operation is configured to be controlled. The signal stored in the buffer RAM 10 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 11 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8, which has an operation of controlling the rotation of a spindle motor for driving the disk 1 to rotate. The rotational drive control operation is performed not only at the specified linear velocity but also at the specified speed 2
It is configured such that it can be rotated at a constant high linear velocity such as double, quadruple, six-fold, and eight-fold.

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 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 recording operation is resumed after the signal recording operation on the disk 1 is interrupted, the signal stored in the buffer RAM 10 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.

In the above configuration, when the signal recording operation is performed at a high speed, for example, eight times the specified speed, instead of the specified speed, the buffer RAM may be used.
When the amount of signals written to the disk 10 becomes insufficient, the disk 1
When the amount of the signal written in the buffer RAM 10 exceeds a predetermined amount, the operation of recording the signal on the disk 1 is restarted.
When a situation occurs in which the amount of the signal written to the M10 is insufficient, the rotation speed of the disk 1 is switched to a low speed side, for example, a state in which the signal recording operation is performed at a rotation speed of six times the specified speed. It is configured.

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 is performed by the spindle motor drive circuit 11. The rotation control operation of the spindle motor decodes the wobble signal. The disk 1 is driven to rotate 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). Such a control operation is similarly 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, the focusing control operation and the 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 of 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 disc 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 the present 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 optimum 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 the position at which the recording operation is 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 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 out,
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.

By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer RAM 10 is performed according to a signal reading operation from the buffer RAM 10. Have been. In the state where the recording operation is normally performed,
Every time a signal is recorded on the disk 1, an address indicating the position, that is, an end address is stored in a memory circuit provided in the system control circuit 8.

When the operation of recording the signal on the disk 1 is interrupted, the operation of reading the signal from the buffer RAM 10 is interrupted. In this case, the writing of the signal to the buffer RAM 10 is performed. The operation is also interrupted. When an operation of starting a signal recording operation on the disc 1 is performed from such a state, the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position where the optical pickup 2 is retracted from a position where the recording operation is interrupted.
The reproduction operation is performed from that position. 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 such a 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. If 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. The operation is performed and the 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 operation of interrupting the recording of the signal on the disk 1 and the operation of resuming the recording can be performed. By performing such an operation, the 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 signal recording operation in this embodiment is performed. Next, the signal recording operation on the disk 1 is not performed at the specified speed but at a rotation speed eight times the specified speed. An operation performed when the amount of signals stored in the buffer RAM 10 is insufficient during a recording operation will be described.

Such a situation occurs when the amount of the signal output from the computer device 7 to the buffer RAM 10 and written therein is smaller than the amount of the signal read from the buffer RAM 10, but such a phenomenon occurs in the computer device 7. This is caused by a delay in the processing operation.

If a signal cannot be recorded on the disk 1 due to a shortage of signals stored in the buffer RAM 10 while a signal is being recorded at a high rotation speed, the computer The operation of the system control circuit 8 based on the signal output from the device 7 causes a processing operation for interrupting the recording operation of the signal on the disk 1 to be performed. Further, when a processing operation for interrupting the recording operation of the signal to the disk 1 is performed, the operation of writing the signal to the buffer RAM 10 also stops. The stored signal is stored and held. The memory circuit incorporated in the system control circuit 8 is in a state where the final address is stored.

When the signal recording operation on the disk 1 cannot be performed, the above-described processing operation is performed. However, the system control circuit 8 increases the rotation speed of the disk 1 by eight times. Then, a processing operation for changing the rotation speed to 6 times the rotation speed and restarting the signal recording operation on the disk 1 is performed. When a signal can be recorded on the disk 1 by such a processing operation, the optical pickup 2 is read from the last address stored in the memory circuit.
Where the recording operation is started, that is, the buffer RAM 1
After the recording operation is displaced to a position retracted from the position where the recording operation was interrupted due to the lack of the signal amount stored in 0, the reproducing operation is performed 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. If 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. The operation is performed and the 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.

In this embodiment, when the signal recording operation is performed at a high rotational speed, the buffer RA
When the recording operation of the signal on the disk 1 is interrupted due to the shortage of the signal written to the M10, the disk 1
Is changed to a lower speed, but the rotation speed is changed when the recording operation is interrupted a predetermined number of times due to a shortage of a signal written in the buffer RAM 10. You can also.

[0035]

According to the present invention, a signal is recorded on a disk at a prescribed speed and at a speed several times higher than the prescribed speed, and by reading out the signal once stored in the buffer RAM. In the configured optical disk recording / reproducing apparatus, when a signal recording operation to a disk is performed at a high speed and a signal recording operation to the disk is interrupted due to insufficient capacity of a signal stored in the buffer RAM. Since the disk rotation speed is changed to a low speed side and the recording operation is restarted,
Since the operation of reading the signal from the buffer becomes slow, the situation that the capacity of the signal stored in the buffer RAM becomes insufficient is reduced, and the number of interruptions of the recording operation can be reduced.

Further, according to the present invention, the processing operation for changing to the low speed side when the recording is interrupted due to insufficient capacity of the signal stored in the buffer RAM is performed when the recording operation is interrupted a predetermined number of times. A processing operation corresponding to the change in the amount of the recording signal can be performed, and the recording operation of the signal can be performed efficiently.

[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 10 buffer RAM 11 spindle motor drive circuit

Claims (3)

[Claims] An optical disk configured to record a signal on a disk by reading a signal once stored in a buffer RAM at a specified speed and a speed several times higher than the specified speed. In a recording / reproducing device,
When the signal recording operation on the disk is performed at a high speed, and when the signal recording operation on the disk is interrupted due to a shortage of the capacity of the signal stored in the buffer RAM, the rotation speed of the disk is reduced to a lower speed. An optical disk recording / reproducing apparatus characterized in that the recording operation is restarted after the change. 2. The optical disk according to claim 1, wherein a signal recording operation is restarted by comparing a signal recorded on the disk with a signal stored in the buffer RAM. Recording and playback device. 3. The optical disk according to claim 1, wherein when the signal recording operation on the disk is interrupted a predetermined number of times, the rotation speed of the disk is changed to a low speed side to restart the recording operation. Recording and playback device.