JP2005196911A - Recording control method of optical disk recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording control method of an optical disk recording and reproducing device in which signals are recorded on a disk by an optical pickup. <P>SOLUTION: A buffer underrun number counting circuit 15 is provided to count the number of recording interruption restart operations caused by buffer underrun while recording operations are conducted in a first signal recording region. When the number of recording interruption restart operations caused by the buffer underrun in the first signal recording region becomes equal to or greater than a prescribed number, the recording operations in a second signal recording region are conducted at a first line speed without changing to a second line speed which is faster than the first line speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording control method for an optical disc recording / reproducing apparatus configured to record a signal on a disc by laser light emitted from an optical pickup and to perform reproduction operation of the signal recorded on the disc by laser light. .

  Disc players that use an optical pickup to read signals recorded on a disc are widely used. In addition to the playback function, a signal can be recorded on the disc by a laser beam emitted from the optical pickup. An optical disc recording / reproducing apparatus configured so as to be able to be made has been commercialized.

  An optical disk recording / playback device used in connection with a computer device is required to perform a recording operation on a disk in a short time, and recently, not only a specified linear velocity but also a specified linear velocity. Thus, the recording operation of the signal can be performed in a state where the rotation of the disk is controlled in a state where the linear velocity is constant such as 4 times or 8 times which is a high speed.

  A recording signal output from the computer device is configured to be temporarily stored in the buffer RAM and then read out from the buffer RAM according to the recording speed on the disk. In such a configuration, if the amount of the recording signal transmitted from the computer device is insufficient with respect to the recording speed to the disc, a phenomenon called buffer underrun occurs, and there is a problem that the recording operation to the disc cannot be performed normally. .

  As a method for solving such a problem, when the buffer underrun state is entered, the recording operation to the disk is temporarily interrupted, and when the amount of the signal stored in the buffer RAM increases, the signal continues from the recording interruption position. A technique for resuming the recording operation has been developed (see, for example, Patent Document 1).

  Further, when the disk rotation control operation is made constant, the disk rotation speed has a characteristic that the inner circumference side is faster than the outer circumference side. If the linear velocity of the disk is the same from the inner circumference side to the outer circumference side and the linear velocity on the outer circumference side is increased, the rotation speed of the spindle motor on the inner circumference side becomes very high, which not only burdens the outer motor. There is a problem that speed control becomes difficult.

As a method for solving such a problem, on the inner periphery side of the disc, the recording operation is performed by rotating the disc at a constant low linear velocity, and the linear velocity of the disc is increased when the recording position is moved to the outer periphery side. For example, a technique called a zone CLV has been developed in which the recording operation is performed by changing to the side (see, for example, Patent Document 2).
JP 2000-40302 A JP 2002-56533 A

In the recording operation by the zone CLV, the signal recording operation is performed while the disk is rotationally driven at a constant low linear velocity on the inner peripheral side, and the disk is rotationally driven at a constant high linear velocity on the outer peripheral side. However, if the capacity of the recording signal transmitted from the computer device is insufficient, a buffer underrun occurs on the inner circumference side, and the recording interruption / resumption operation is performed. Become. The frequency of occurrence of such buffer underrun increases on the outer peripheral side where the recording operation is performed at a constant high linear velocity. When the number of times that such a recording interruption / resuming operation is performed increases, there is a problem that the time required to record the signal transmitted from the computer apparatus on the disk becomes long.

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

  The present invention is configured to record the signal on the disk by reading the signal once stored in the buffer RAM, and the buffer underrun state in which the capacity of the signal stored in the buffer RAM is insufficient The recording operation is interrupted when the recording capacity is reached, and the recording operation can be resumed from the recording interruption position when the signal capacity increases, and the recording operation is performed at the first linear velocity at which the recording position is low. A recording control method for an optical disc recording / reproducing apparatus configured to change a rotational speed of a disc when moving from a one signal recording region to a second signal recording region for performing a recording operation at a high second linear velocity. A buffer that counts the number of times a recording interruption and resuming operation is performed due to a buffer underrun when a recording operation is performed in the signal recording area. An underrun frequency counting circuit is provided so that when the number of times of the recording interruption / resuming operation due to the buffer underrun in the first signal recording area is more than a predetermined number, the recording operation in the second signal recording area is performed at the first linear velocity. It is configured.

  Further, the present invention is configured such that when the recording position reaches the boundary between the first signal recording area and the second signal recording area, the operation of changing the rotational speed of the disk is performed in a state where the signal recording operation is temporarily interrupted. Has been.

  The present invention is configured to start the signal recording operation when the rotational speed of the disc is stabilized at the second linear velocity.

  The present invention is configured to record the signal on the disk by reading the signal once stored in the buffer RAM, and the buffer underrun state in which the capacity of the signal stored in the buffer RAM is insufficient The recording operation is interrupted when the recording capacity is reached, and the recording operation can be resumed from the recording interruption position when the signal capacity increases, and the recording operation is performed at the first linear velocity at which the recording position is low. A recording control method for an optical disc recording / reproducing apparatus configured to change a rotational speed of a disc when moving from a one signal recording region to a second signal recording region for performing a recording operation at a high second linear velocity. A buffer that counts the number of times a recording interruption and resuming operation is performed due to a buffer underrun when a recording operation is performed in the signal recording area. An underrun frequency counting circuit is provided so that when the number of times of the recording interruption / resuming operation due to the buffer underrun in the first signal recording area is more than a predetermined number, the recording operation in the second signal recording area is performed at the first linear velocity. Therefore, it is possible to reduce the number of times that the recording interruption / resuming operation due to the buffer underrun is performed, and as a result, it is possible to shorten the recording time to the disk.

  Further, in the present invention, when the recording position reaches the boundary between the first signal recording area and the second signal recording area, the operation of changing the rotational speed of the disc is performed in a state where the signal recording operation is temporarily interrupted. Therefore, the signal recording characteristics can be improved.

In the present invention, since the signal recording operation is started when the rotational speed of the disk is stabilized at the second linear velocity, the recording operation for maintaining the continuity of the signal can be accurately performed.

  According to the present invention, the recording speed changing operation is controlled by counting the number of times of the recording interruption / resuming operation due to the buffer underrun.

  FIG. 1 is a circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention, and FIG. 2 is a plan view showing the optical disk according to the present invention.

  In FIG. 2, a test writing area A used for setting a laser output for performing a signal recording operation on the disk, position information of signals recorded on the disk, and the like are recorded on the inner peripheral side of the disk 1. PMA region B is provided. A signal recording area in which signals are recorded is provided on the outer peripheral side of the PMA area, and a first signal recording area C in which signals are recorded at a constant first linear velocity and a second speed higher than the first linear velocity. A second signal recording area D is formed in which signals are recorded at a constant linear velocity.

  In FIG. 1, reference numeral 2 denotes a turntable on which the disk 1 is placed, and is configured to be rotationally driven by a spindle motor 3 so that the linear velocity is constant. On the disk 1, position information data indicating the position on the disk is recorded by meandering grooves called pregrooves. In the optical disk recording / reproducing apparatus, a signal recording / reproducing operation is performed based on a wobble signal obtained from the grooves. And a signal recording position recognition operation.

  Reference numeral 4 denotes a laser diode that incorporates a laser diode that emits laser light emitted to the disk 1 and a monitoring diode that monitors the amount of laser light emitted from the laser diode and that is reflected from the signal surface of the disk 1. An optical pickup incorporating a photodetector for receiving light, and configured to be moved in the radial direction of the disk 1 by a pickup feeding motor (not shown). Also, in the optical pickup 4, a focusing coil for displacing an objective lens (not shown) in the surface direction of the disk 1 and a tracking coil for displacing the objective lens in the radial direction of the disk 1 are incorporated as is well known. ing.

  Reference numeral 5 denotes an RF signal amplifying circuit that receives an RF signal obtained from a photodetector incorporated in the optical pickup 4 and amplifies the signal, and outputs a binary signal by shaping the RF signal. Is configured to do. Reference numeral 6 denotes a focusing control operation for focusing the laser light emitted from the laser diode on the signal surface of the disk 1 based on the signal obtained from the photodetector incorporated in the optical pickup 4, and the laser light to the signal surface. A pickup control circuit that performs a tracking control operation to follow the signal track of the tracking signal, and is configured to output a tracking control signal based on the tracking error signal and a focusing control signal based on the focus error signal to the focusing coil and the tracking coil. ing.

  Reference numeral 7 denotes a digital signal processing circuit that receives the binarized signal output from the RF signal amplifier circuit 5 and performs digital signal processing of the signal, and is used to perform recording / reproducing operations for optical disc recording / reproduction. It is configured to perform demodulation operations of various signals.

Reference numeral 8 denotes a signal reproduction circuit to which the digital signal processed by the digital signal processing circuit 7 is input. The signal reproduction circuit outputs a signal corresponding to the signal recorded on the disk 1, that is, a signal to be reproduced. If the audio signal is an audio signal, it is converted to an analog signal and then output to an amplifier or the like. If it is a data signal such as computer software, it is output as a digital signal to a computer device 9 connected as a host. Has been.

  Reference numeral 10 denotes a system control circuit that receives various signals demodulated by the digital signal processing circuit 7 and performs various control operations in accordance with command signals output from the computer device 9. As is well known, a clock signal generation circuit (not shown) that generates a clock signal for signal reproduction, signal recording, or the like based on the synchronizing signal is incorporated. Reference numeral 11 denotes a buffer RAM whose signal writing and reading operations are controlled by the system control circuit 10. The recording signal output from the computer device 9 is temporarily stored and the recording operation to the disk 1 is performed. Accordingly, the stored signal is read out.

  A laser drive circuit 12 supplies a drive signal to a laser diode incorporated in the optical pickup 4. A signal 13 encodes a signal for recording a recording signal on the disk 1 and supplies the signal to the laser drive circuit 12. This is a recording circuit, and is configured to output a test signal at the time of setting operation of laser output and a recording signal output from the computer device 9.

  Reference numeral 14 denotes a spindle motor driving circuit whose operation is controlled by the system control circuit 10, and the spindle motor 3 is set to a state where the first linear velocity is constant and a second linear velocity which is higher than the first linear velocity. And is configured to be rotationally driven.

  In such a configuration, the recording signal output from the computer device 9 is once stored in the buffer RAM 11 and then read out from the buffer RAM 11 and recorded on the disk 1 in accordance with the recording operation on the disk 1. When the capacity of the recording signal stored in the buffer RAM 11 is insufficient, that is, when the buffer underrun state occurs, the recording operation to the disk 1 is interrupted, and when the amount of the recording signal reaches the recordable capacity, the disk 1 The recording operation is resumed.

  Since the recording interruption / resuming operation in the case of the buffer underrun state can be easily performed using the technique described in Patent Document 1, the description thereof is omitted. Reference numeral 15 denotes a buffer underrun count circuit that counts the number of times when the recording interruption resumption operation due to the buffer underrun is performed.

  In such a configuration, in the first signal recording area C, a signal recording operation is performed at a low first linear velocity constant state, and in the second signal recording area D, a high second linear velocity constant state is achieved. Is configured to perform a signal recording operation. The system control circuit 10 performs switching control operations of the digital signal processing circuit 7, the buffer RAM 11, the laser driving circuit 12, the signal recording circuit 13, the spindle motor driving circuit 14, and the like corresponding to the recording speed.

  Further, in the recording operation state, when the recording position reaches the boundary between the first signal recording area C and the second signal recording area D, the recording operation of the signal to the disk 1 is once interrupted, and then the rotation speed of the disk is set to the second speed. The recording operation is changed to a state in which the linear velocity is constant, and the recording operation is resumed when the rotational speed is stabilized in a state in which the second linear velocity is constant.

In the present invention, the buffer underrun count circuit 15 counts the number of times that the recording interruption resumption operation due to the buffer underrun is performed when the signal recording operation to the first signal recording area C is performed, When the number of times reaches a predetermined number, even if the recording position reaches the second signal recording area D, the recording linear velocity is not changed and the recording operation is continued with the first linear velocity constant. It is configured as follows.

  As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the operation will be described. Various operations of the optical disk recording / reproducing apparatus are performed based on a command signal output from the computer apparatus 9, but in the state where the recording operation and the reproducing operation are performed, the light detection incorporated in the optical pickup 4 is performed. A focus error signal and a tracking error signal are generated from a signal obtained from the detector, and a control operation for performing a focusing control operation and a tracking control operation based on the generated error signal is performed by the pickup control circuit 6.

  When each control operation by the pickup control circuit 6 is performed, a drive control signal is output from the pickup control circuit 6 to the focusing coil and the tracking coil. Such a drive control signal displaces the objective lens in a direction to reduce the level of the focus error signal or tracking error signal, so that focusing is performed to focus the laser light emitted from the optical pickup 4 on the signal surface on the disk 1. It is possible to perform a control operation and a tracking control operation that follows the signal track.

  As described above, the focusing control operation and the tracking control operation by the pickup control circuit 6 are performed. Next, the reproduction operation in the circuit thus configured will be described. When a command signal for performing a reproduction operation is output from the computer device 9 to the system control circuit 10 constituting the optical disk recording / reproduction device, the control operation for the reproduction operation by the system control circuit 10 is started. When such a reproduction operation is performed, the laser diode incorporated in the optical pickup 4 is supplied with a drive current from which the laser output necessary for performing the reproduction operation is obtained from the laser drive circuit 12.

  When the control operation for such a reproduction operation is started, the rotation control operation of the spindle motor 3 by the spindle motor drive circuit 14 is performed. The rotation control operation of the spindle motor 3 is performed by decoding the wobble signal. By comparing the obtained synchronization signal with a reference signal output from a reference signal generation circuit (not shown), the disc 1 is kept in the first signal recording area C at the first linear velocity constant and the second signal recording area D. Then, it is performed so as to rotate at a constant second linear velocity. Such a rotational driving operation of the disk 1 is performed in the same manner during a signal recording operation described later.

  The rotation control operation of the spindle motor 3 is performed as described above. In the optical pickup 4 that performs the signal reading operation, the above-described focusing control operation and tracking control operation are performed. As a result of such a control operation, a signal reading operation from the disc 1 by the optical pickup 4 is started, but a reading operation of the TOC data recorded in the lead-in area of the disc 1 is performed prior to the reproducing operation. Done.

  The reading operation of the signal recorded on the disk 1 is performed by moving the optical pickup 4 to a desired position based on the TOC data. A signal reproduced by a photodetector incorporated in the optical pickup 4 is input to the RF signal amplifier circuit 5 to be amplified and binarized and output.

  The binarized signal output from the RF signal amplifier circuit 5 is input to the digital signal processing circuit 7 for digital signal processing, and various signals are demodulated. When digital signal processing is performed by the digital signal processing circuit 7 and information data is extracted, the information data is subjected to signal processing such as error correction and then applied to the signal reproduction circuit 8.

  When the information data read from the disk 1 is an audio signal, the signal reproduction circuit 8 converts the information data into an analog signal and outputs it to an amplifier or the like. Is output to the computer device 9 as a digital signal.

  As described above, the reproduction operation in this embodiment is performed. Next, the signal recording operation on the disk 1 will be described.

  The operation of recording a signal on the disc 1 is started by first setting a laser output optimum for the recording operation by recording a test signal in a test writing area A provided on the disc 1 and then reproducing the signal. However, since such an operation is well known, the description thereof is omitted.

  When the setting operation of the laser output suitable for performing the recording operation is completed, the information data recorded in the PMA area B provided on the disk 1, that is, the signal is recorded in the signal signal recording area which is the area where the signal is recorded. An operation of reading position information of the signal being performed is performed. By reading out such information data, a signal recording operation can be performed in the signal recording area, and a recognition operation such as where the recording operation is performed is performed.

  When such a recognition operation is performed, an operation for moving the optical pickup 4 to the recording start position and a level adjustment operation for the drive signal output from the laser drive circuit 12 to the laser diode are performed. On the other hand, the recording signal output from the computer device 9 is temporarily stored in the buffer RAM 11 and read out in accordance with the signal recording operation on the disk 1.

  The recording signal read from the buffer RAM 11 is input to the signal recording circuit 13, encoded by the signal recording circuit 13, and then input to the laser driving circuit 12. As a result, a drive signal corresponding to the recording signal is supplied from the laser drive circuit 12 to the laser diode, and laser light is emitted from the laser diode. As a result of such laser light being emitted, a signal is recorded in the signal recording area of the disk 1.

  The signal recording operation to the signal recording area of the disk 1 is performed as described above. When the recording operation to the first signal recording area C is being performed, the spindle motor driving circuit 14 drives the spindle motor 3 to rotate. The disc 1 is driven by the control operation at a first linear velocity constant, for example, at a constant linear velocity four times the prescribed linear velocity, and when the recording operation to the second signal recording area D is being performed, the spindle motor is driven. The disk 1 is driven at a constant second linear velocity, for example, a constant linear velocity eight times the specified linear velocity, by the rotational drive control operation for the spindle motor 3 by the circuit 14.

  As described above, since the recording operation on the disc 1 by the zone CLV method is performed, the linear velocity in the first signal recording area C and the linear velocity in the second signal recording area D are different. When the recording position reaches the boundary between the first signal recording area C and the second signal recording area D during the recording operation, an operation for changing the rotational speed of the disc 1 is performed. Such a speed changing operation is performed. During this time, the signal recording operation on the disk 1 is interrupted, and the recording operation on the disk 1 is resumed when the rotational speed of the disk 1 is stabilized at a constant second linear speed after the speed change.

  When the capacity of the recording signal output from the computer device 9 is not insufficient, that is, when the buffer underrun state is not achieved, the recording operation in the first signal recording area C and the second signal recording area D is performed in the zone. Next, the operation when the buffer underrun occurs will be described.

  When the recording operation of the signal to the first signal recording area C and the second signal recording area D is being performed, if the capacity of the recording signal stored in the buffer RAM 11 is insufficient, the recording operation to the disk 1 is continued. Incapable of being buffered, that is, a buffer underrun state. In such a state, a control operation for interrupting the signal recording operation on the disk 1 is performed. In a state in which the recording operation is interrupted, a recording signal output from the computer device 9 is written into the buffer RAM 11, and when the storage capacity reaches a predetermined amount, the recording operation to the disk 1 is resumed.

  The operation of resuming the recording of the signal to the disc 1 is performed by synchronizing the synchronization signal included in the signal recorded on the disc 1 before the recording interruption with the synchronization signal for recording. Since the operation can be performed by using a well-known technique, the description thereof is omitted.

  Even if a buffer underrun occurs, the recording interruption / resumption operation described above can be performed without any trouble, but there is a problem that the recording time becomes long. In the present invention, the number of buffer underruns occurring during the recording operation to the first signal recording area C is counted by the buffer underrun number counting circuit 15, and the second signal recording area D is counted according to the counted number. Whether to change the linear velocity to the second linear velocity is selectively performed.

  That is, in the first signal recording area C in which the signal recording operation is performed in a state where the first linear velocity is lower than the second linear velocity, if the buffer underrun occurs a predetermined number of times or more, the second linear velocity is constant. In the second signal recording area D where the signal recording operation is performed, more buffer underruns occur. Accordingly, when the buffer underrun has occurred a predetermined number of times or more in the first signal recording area C, the linear velocity of the disk 1 is changed to the second linear velocity even if the signal recording position reaches the second signal recording area D. Do not perform any action. That is, in such a case, the rotation speed of the disc 1 in the second signal recording area D as well as the first signal recording area C is set at the first linear velocity constant. Thus, the linear velocity changing operation is not performed, but the signal recording time on the disk 1 is shorter than that when the velocity is changed.

It is a circuit diagram which shows one Example of the optical disk recording / reproducing apparatus based on this invention. 1 is a plan view showing an optical disc according to the present invention.

Explanation of symbols

1 disc
3 Spindle motor
4 Optical pickup
5 RF signal amplification circuit
7 Digital signal processing circuit
9 Computer device 10 System control circuit 11 Buffer RAM
12 Laser drive circuit 13 Signal recording circuit 14 Spindle motor drive circuit 15 Buffer underrun count circuit

Claims (3)

When the signal is stored in the disk by reading the signal once stored in the buffer RAM, and when the buffer underrun state in which the capacity of the signal stored in the buffer RAM is insufficient The first signal recording area is configured so that the recording operation can be resumed from the recording interruption position when the recording operation is interrupted and the signal capacity is increased, and the recording operation is performed at the first linear velocity at which the recording position is low. Is a recording control method for an optical disc recording / reproducing apparatus configured to change the rotational speed of a disc when moving to a second signal recording area for performing a recording operation at a high second linear velocity from the first signal recording area. Buffer undercount that counts the number of times recording is resumed due to buffer underrun when recording is in progress A run count circuit is provided so that when the number of recording interruption and resuming operations due to buffer underrun in the first signal recording area occurs more than a predetermined number, the recording operation in the second signal recording area is performed at the first linear velocity. A recording control method for an optical disc recording / reproducing apparatus. When the recording position reaches the boundary between the first signal recording area and the second signal recording area, the operation of changing the rotational speed of the disc is performed with the signal recording operation temporarily suspended. Item 2. The recording control method according to Item 1. 3. The recording control method according to claim 2, wherein a signal recording operation is started when the rotational speed of the disk is stabilized at the second linear speed.

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