JP2002269912A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device capable of recording signals in a disk by using a laser beam emitted from an optical pickup. SOLUTION: Host equipment monitors a signal quantity stored in RAM 10 for a buffer, and when it judges that the signal quantity is decreased to such a quantity as requires to interrupt recording, the host equipment periodically outputs an instruction signal for obtaining an address indicating a recording interruption position to the optical disk recording and reproducing device.

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, the recording linear velocity has been increased by two times, four times, and six times.
An optical disk recording / reproducing apparatus has been developed which is capable of recording a signal while controlling the rotation of the disk at a constant high linear velocity of 8 times, 8 times, 10 times or 12 times.

[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 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 performing the recording operation increases.

When a buffer underrun condition occurs in order to solve such a problem, 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 read. 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.

As described above, when the amount of the signal stored in the buffer RAM falls below a predetermined amount, the operation of recording the signal on the disk is interrupted, and the amount of the signal stored in the buffer RAM decreases. When the predetermined amount has been reached, a processing operation for restarting the recording operation is performed, but when the recording operation is completed, it is not possible to recognize at which position on the disc the recording interruption / restart operation was performed during the recording operation. An object of the present invention is to provide an optical disk recording / reproducing apparatus capable of solving such a problem.

[0007]

SUMMARY OF THE INVENTION The present invention provides a buffer RA which temporarily stores a recording signal output from a host device.
When the recording signal is read from M, the signal is recorded on the disk, and when the signal is recorded on the disk, the amount of the signal stored in the buffer RAM is insufficient. An optical disc recording / reproducing apparatus configured to suspend the recording operation of the buffer and restart the recording operation of the signal on the disk when the amount of the signal stored in the buffer RAM reaches a predetermined amount. When the amount of the signal stored in the RAM is monitored by the host device, and it is determined that the amount of the signal has decreased to the amount required to perform the recording interruption operation,
The host device periodically outputs a command signal to the optical disk recording / reproducing device for acquiring an address indicating a recording interruption position.

[0008]

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. 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 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 via the RF signal amplifying 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 device 7 is written, and a signal storage / write operation and a signal storage / write operation are performed by a control operation of the system control circuit 8. The reading operation is controlled. Reference numeral 11 denotes a spindle motor driving 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. Such a rotational drive control operation is performed at twice the specified speed, as well as at the specified linear speed.
It is configured to be able to rotate at a constant high linear velocity such as double, six times, eight times, ten times, and twelve times.

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 a read operation of the stored signal is controlled to control the disk. 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, the disk 1
Interrupts the signal recording operation to the computer 7
When the amount of the signal stored in the buffer RAM 10 increases to a predetermined amount by the writing operation of the signal output from the
The control operation for restarting the operation of recording the signal to the CAM is performed.

The 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. If the recording operation is not resumed by the computer device 7 even after a lapse of a predetermined time after the interruption of the recording operation, a processing operation for terminating the recording operation is performed.

The recording interruption / resumption operation in the optical disk recording / reproducing apparatus is performed by the control operation of the system control circuit 8, that is, by detecting the amount of signals stored in the buffer RAM 10. The operation of detecting the amount of the stored signal is always performed by the computer device 7. When it is determined that the amount of signals stored in the buffer RAM 10 is insufficient, that is, when it is determined that the recording interruption operation needs to be performed, the computer device 7 suspends recording on the optical disk recording / reproducing device. When the operation is performed, a command signal for acquiring an address indicating the recording interruption position is periodically output.

When a recording interruption operation is performed, an address indicating the recording interruption position is transmitted from the optical disk recording / reproducing device to the computer device 7, and the recording interruption position is determined by the optical disk recording / reproducing device. When the indicated address is transmitted, a memory means for storing the address is provided in the computer device 7. The operation of storing such an address in the memory means is performed every time the recording interruption operation is performed, and by recognizing the address stored in the storage means, the recording interruption resuming position on the disk 1 is recognized. It is possible to recognize the number of times the recording suspension / resumption operation has been 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. When a command signal for performing a reproducing operation is output from the computer device 7 to a system control circuit 8 constituting the optical disk recording / reproducing device, 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.

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. Will be described.

During the recording operation, the buffer R
When the capacity of the signal stored in the AM 10 becomes insufficient, the recording operation on the disk 1 is interrupted, and when the capacity of the signal stored in the buffer RAM increases to a predetermined amount, the signal recording operation is restarted. When the recording operation on the disk 1 is being performed, the computer device 7 is constantly monitoring the change in the amount of the signal stored in the buffer RAM 10. If the computer device 7 performs an operation of detecting the amount of the signal stored in the buffer RAM 10 and determines that the amount is insufficient, that is, if the recording operation is interrupted by a buffer underrun, the computer device 7, when a recording interruption operation is performed, a command signal for acquiring an address indicating the recording interruption position is periodically output to the system control circuit 8 constituting the optical disk recording / reproducing apparatus.

If the recording interruption operation is performed by the control operation of the system control circuit 8 in a state where such an instruction signal is periodically inputted, the recording operation on the disk 1 is interrupted as described above. At this time, an address indicating the recording interruption position of the disk 1 is output to the computer device 7. When the address is input to the computer device 7 in this manner, the address information indicating the recording interruption position is stored in the memory means incorporated in the computer device 7. Such an operation of storing the address information is performed every time the recording interruption operation is performed.

When it is determined that the amount of signals stored in the buffer RAM 10 is insufficient, when the computer device 7 performs a recording interruption operation on the system control circuit 8 constituting the optical disk recording / reproducing device, A command signal for acquiring an address indicating the recording interruption position is periodically output. However, if the amount of the signal stored in the buffer RAM 10 increases without performing the recording interruption operation, It is configured such that the output operation of the command signal is not performed, and the output operation of the command signal is not performed even when the recording stop operation is performed and the address indicating the recording stop position is received.

As described above, the address indicating the position where the recording interruption / resuming operation has been performed is stored in the memory means provided in the computer device 7.
When the recording operation is completed, it is possible to recognize at which position on the disk 1 the recording interruption / restart operation has been performed, which is convenient when evaluating the recording characteristics. Further, by counting the number of addresses stored in the memory means provided in the computer device 7, the user can perform a recording interruption / resuming operation due to a buffer underrun generated during the recording operation on the disk 1. Can be made to recognize the number that was performed. By recognizing such a number, the user can not only recognize whether the processing capability of the computer device 7 is high or low, but also determine whether it is better to reduce the recording speed and perform the recording operation. Etc. can be determined.

In the present embodiment, the amount of signals stored in the buffer RAM 10 is monitored by the computer device 7 serving as a host device, but is stored in the buffer RAM 10 in the computer device 7. Providing a data buffer for storing data corresponding to the amount of signal present, and determining whether or not it is necessary to perform a recording interruption operation based on the data stored in the data buffer. Can also be. In such a configuration, when it is determined that the optical disc recording / reproducing apparatus needs to perform the recording suspending operation, the computer apparatus 7 transmits the recording suspending operation to the system control circuit 8 constituting the optical disc recording / reproducing apparatus. When the recording is performed, a command signal for acquiring an address indicating the recording interruption position is periodically output, and when the recording interruption operation is performed thereafter, the address information is transmitted from the optical disc recording / reproducing apparatus to the computer 7. Sent. When the address is input to the computer device 7 in this manner, the address information indicating the recording interruption position is stored in the memory means incorporated in the computer device 7. It is performed every time the interruption operation is performed.

[0036]

According to the present invention, the recording signal is read from the buffer RAM in which the recording signal output from the host device is temporarily stored, thereby recording the signal on the disk and recording the signal on the disk. The recording operation of the signal to the disk is interrupted due to the shortage of the signal stored in the buffer RAM,
An optical disk recording / reproducing apparatus configured to restart a signal recording operation on a disk when an amount of a signal stored in the buffer RAM reaches a predetermined amount,
The amount of the signal stored in the buffer RAM is monitored by the host device, and when it is determined that the amount of the signal has decreased to the amount required to perform the recording interruption operation, the host device sends the signal to the optical disk recording / reproducing apparatus. On the other hand, since the command signal for acquiring the address indicating the recording interruption position is periodically output, the operation of transmitting the command signal from the host device can be performed at a necessary time and efficiently.

According to the present invention, a data buffer for storing data corresponding to the amount of signals stored in the buffer RAM is provided in the host device, and the data stored in the data buffer is stored in the host device. When it is determined that the recording interruption operation needs to be performed based on the data, a host device periodically outputs a command signal to the optical disk recording / reproducing device for acquiring an address indicating a recording interruption position. That is, since the host device determines whether or not it is necessary to perform the recording interruption operation, the determination operation can be easily performed.

According to the present invention, when the recording interruption operation is performed, the address indicating the recording interruption position is transmitted to the host device, so that the recording interruption restart operation is performed at any position on the disk. Can be recognized. Therefore, it is convenient to check recording characteristics at that position, for example, characteristics such as continuity of a recording signal.

Further, according to the present invention, the received address is stored in the memory means provided in the host device, so that the recording interruption / resuming operation is performed by counting the number of the stored addresses. This has the advantage that the number can be recognized.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing one 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

Continued on the front page F term (reference) 5D044 BC04 CC04 DE38 EF03 HH02 HH20 JJ01 5D090 AA01 BB03 BB04 CC01 DD03 FF30 FF33

Claims (4)

[Claims] When the recording signal is read from a buffer RAM in which a recording signal output from a host device is temporarily stored, the signal is recorded on a disk, and the signal is recorded on the disk. When the amount of the signal stored in the buffer RAM is insufficient, the operation of recording the signal to the disk is interrupted, and when the amount of the signal stored in the buffer RAM reaches a predetermined amount, the signal to the disk is In the optical disc recording / reproducing apparatus configured to restart the recording operation, the amount of the signal stored in the buffer RAM needs to be monitored by the host device, and the amount of the signal needs to perform the recording interruption operation. When it is determined that the amount has decreased, the host device instructs the optical disc recording / reproducing apparatus to obtain an address indicating the recording interruption position An optical disk recording / reproducing apparatus characterized in that a signal is periodically output. 2. When the recording signal is read from a buffer RAM in which a recording signal output from a host device is temporarily stored, the signal is recorded on a disk and the signal is recorded on the disk. When the amount of the signal stored in the buffer RAM is insufficient, the operation of recording the signal to the disk is interrupted, and when the amount of the signal stored in the buffer RAM reaches a predetermined amount, the signal to the disk is An optical disk recording / reproducing apparatus configured to restart the recording operation of the host device, wherein a data buffer for storing data corresponding to the amount of signal stored in the buffer RAM is provided in the host device, and the data buffer The host device monitors the data stored in the storage device and determines from the data that it is necessary to perform the recording interruption operation. An optical disk recording / reproducing apparatus wherein a command signal for acquiring an address indicating a recording interruption position is periodically output from the host device to the optical disk recording / reproducing apparatus. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein an address indicating a recording interruption position is transmitted to the host device when the recording interruption operation is performed. 4. The optical disk recording / reproducing apparatus according to claim 3, wherein the received address is stored in a memory means provided in the host device.