JP2005293674A - Recording control method of optical disk recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording control method of an optical disk recording and reproducing apparatus capable of recording a signal onto a disk by using an optical pickup. <P>SOLUTION: The recording method employs a recording buffer memory 15 for temporarily storing a recording signal transmitted from a host device, retries the movement of the optical pickup 4 when the movement to a recording start sector cannot normally be executed in the case of the movement of the optical pickup 4 to the recording start sector on the basis of a recording start instruction, detects the amount of the recording signal stored in the recording buffer memory 15 when the retrial is carried out, and revises the recording start position to a succeeding sector when the amount of the detected recording signal exceeds a prescribed amount. <P>COPYRIGHT: (C)2006,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.

  An optical disk playback device that performs an operation of reading a signal recorded on a disk using an optical pickup is widely used. In addition to the playback function, a signal is recorded on the disk by a laser beam emitted from the optical pickup. An optical disc recording / reproducing apparatus configured so as to be capable of recording is commercially available.

  As an optical disk recording / reproducing apparatus, an apparatus using a disk called CD is widely used. Recently, an apparatus using a disk called DVD is becoming popular. An optical disc recording / reproducing apparatus using such a DVD disc has a feature that a video signal can be recorded for a long time because the recording capacity is larger than that of a CD.

An optical disk recording / reproducing apparatus using a DVD disk is often used by being connected to a computer device which is a host device. Recently, an image signal and an audio signal obtained by receiving a television broadcast are recorded on the disk. Such devices have been commercialized. In such an optical disc recording / reproducing apparatus, the signal recording operation to the disc is performed based on the disc standard. The input recording signal is temporarily stored in a memory called a buffer memory and then read out to the disc. It is made to record (for example, refer patent document 1).
JP 2001-67804 A

  When recording a recording signal composed of a video signal, an audio signal, or the like obtained by receiving a television broadcast on the disc, the input recording signal is not interrupted, that is, continuously input to the optical disc recording / reproducing apparatus. The Therefore, when the recording operation is started, it is necessary to quickly move the optical pickup to the recording start position on the disk, that is, the sector position where recording is started.

  The operation of moving the optical pickup to the recording start sector is rapidly performed using an address obtained from a meandering groove called a pregroove formed on the disk, but the operation of detecting the position of the recording start sector is performed. In some cases, the operation is not normally performed. In such a case, an operation called retry is performed in which the movement operation to the recording start position is performed again. If such a retry operation is repeated, the movement of the optical pickup to the recording start sector is delayed, so the time required to start the recording operation from that position becomes longer, and as a result, the recording signal is temporarily stored. There is a problem in that the recording signal overflows when the recording signal is input in excess of the capacity of the buffer memory provided.

  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 provides a recording buffer memory that temporarily stores a recording signal transmitted from a host device, and the optical pickup moves to the recording start sector based on the recording start command. When the operation cannot be performed normally, a retry operation is performed. When the retry operation is performed, the amount of the recording signal stored in the recording buffer memory is detected. When the amount of the detected recording signal exceeds the predetermined amount The recording start position is changed to the next sector.

  Further, the present invention provides a recording stored in the recording buffer memory based on the amount of the recording signal stored in the recording buffer memory when the operation of changing the recording start position to the next sector is performed. The recording signal is selected from the signals to be recorded on the disc by the recording start operation.

  In the present invention, when the movement operation to the next sector cannot be normally performed, the recording abnormality is processed.

  The present invention provides a recording buffer memory that temporarily stores a recording signal transmitted from a host device, and the optical pickup moves to the recording start sector based on the recording start command. When the operation cannot be performed normally, a retry operation is performed. When the retry operation is performed, the amount of the recording signal stored in the recording buffer memory is detected. When the amount of the detected recording signal exceeds the predetermined amount Since the recording start position is changed to the next sector, it is possible to prevent unnecessary retry operations from being performed.

  Further, the present invention provides a recording stored in the recording buffer memory based on the amount of the recording signal stored in the recording buffer memory when the operation of changing the recording start position to the next sector is performed. Since the selection operation of the recording signal to be recorded on the disk is performed from the signal by the recording start operation, the operation of missing the recording signal can be minimized.

  According to the present invention, when the moving operation to the next sector cannot be normally performed, the recording abnormality is processed, so that a wasteful retry operation can be prevented.

  The present invention is configured to control the movement operation to the recording start sector by detecting the amount of the recording signal stored in the buffer memory in which the recording signal is temporarily stored.

  FIG. 1 is a circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the recording control method of the present invention, and FIG. 2 is an explanatory diagram for explaining the capacity of a buffer memory according to the present invention.

  In FIG. 1, reference numeral 1 denotes a disk placed on a turntable 3 that is rotationally driven by a spindle motor 2. In order to set the laser output on the inner circumference side in accordance with the recording characteristics of the disk when performing a recording operation. A test writing area in which a test signal is recorded is provided. In addition, the disc 1 is configured such that position information data is recorded in a groove called a pregroove, and a signal recording / reproducing operation is performed based on a wobble signal obtained from the groove.

Reference numeral 4 denotes an optical pickup that irradiates a laser beam for performing an operation of reading a signal recorded on the disc 1 and an operation of recording a signal on the disc 1, and although not shown, a laser diode that emits a laser beam, Monitor diode for monitoring the level of laser light emitted from the laser diode, photodetector for receiving laser light reflected from the signal surface of the disk 1, objective lens, and displacement of the objective lens in a direction perpendicular to the disk surface A focusing coil to be moved and a tracking coil for displacing the objective lens in the radial direction of the disk 1 are incorporated as is well known and can be displaced in the radial direction of the disk 1 by a pickup feed motor (not shown). Has been.

  Reference numeral 5 denotes an RF signal amplifying circuit that receives a signal obtained from a photodetector incorporated in the optical pickup 4 and amplifies the signal, and shapes the RF signal and outputs a binarized signal. Is configured to do. Reference numeral 6 denotes a focusing control operation for focusing the laser beam on the signal surface of the disk 1 based on a focus error signal and a tracking error signal generated from a signal obtained from the photodetector, and tracking for causing the laser beam to follow a signal track. A pickup control circuit that performs a control operation, and is configured to output a focusing control signal based on a focus error signal and a tracking control signal based on a tracking error signal.

  Reference numeral 7 denotes a driving circuit to which a focusing control signal and a tracking control signal output from the pickup control circuit 6 are input, and a driving coil based on the input control signal includes a focusing coil incorporated in the optical pickup 4 and The tracking coil is configured to be supplied.

  Reference numeral 8 denotes a digital signal processing circuit that receives the binarized signal output from the RF signal amplifier circuit 5 and performs processing of the signal, and is configured to perform demodulation processing of various signals. Reference numeral 9 denotes a signal reproduction circuit to which the signal demodulated by the digital signal processing circuit 8 is input, and a signal to the reproduction buffer memory 10 provided for performing an error correction processing operation or the like of the reproduced signal. By controlling the writing operation and the reading operation, a signal reproduction operation, that is, a video signal or audio signal demodulation operation is performed.

  Reference numeral 11 denotes a system control circuit for controlling each operation of the optical disk recording / reproducing apparatus. Reference numeral 12 denotes a computer device used as a host device connected to the optical disk recording / reproducing apparatus. A system control circuit 11 is connected. The computer device 12 has a built-in receiver for receiving a television broadcast, and outputs a video signal or an audio signal obtained from the received signal to the optical disc recording / reproducing device via the interface circuit 13. It is configured.

  14 is a signal recording circuit that encodes a signal for recording on the disk 1 while a recording signal output from the computer device 12 is input via the interface circuit 13 and the system control circuit 11, and 15 is a recording signal. This is a recording buffer memory that is temporarily stored, and is configured to perform a recording signal reading operation based on a reading operation of the signal recording circuit 14 based on a control operation of the system control circuit 11. Reference numeral 16 is configured to receive the recording signal encoded by the signal recording circuit 14 and to supply a drive signal, which is a pulse signal corresponding to the recording signal, to a laser diode incorporated in the optical pickup 4. ing.

  Reference numeral 17 denotes a spindle motor drive circuit that rotationally drives the spindle motor 2 and is configured to control the rotation operation of the disk 1 by a control signal output from the system control circuit 11. The rotational drive operation of the disk 1 is performed so that the linear velocity is constant. Such a control operation is performed from a synchronization signal obtained from a pregroove formed on the disk 1 and a reference signal generation circuit (not shown). This is performed by controlling the generated reference clock signal to be synchronized.

  In such a configuration, each control operation such as a recording operation in the optical disc recording / reproducing apparatus is performed based on program software stored in a ROM (not shown) incorporated in the system control circuit 11. A command signal for starting the operation is configured to be output from the computer device 12.

  As described above, the optical disk recording / reproducing apparatus according to the present invention is configured. Next, the operation will be described. When a command signal for reproducing a signal recorded on the disk 1 is output from the computer device 12, the command signal is input to the system control circuit 11 through the interface circuit 13.

  When a command signal for performing such a reproduction operation is input to the system control circuit 11, a control operation based on program software for performing the reproduction operation stored in the ROM is started. Before such an operation for reproduction is performed, an operation for reading the disc information recorded in the lead-in area provided on the inner peripheral side of the disc 1 is performed. That is, such an operation is performed when the disc 1 is placed on the turntable 3 provided in the optical disc recording / reproducing apparatus.

  That is, when the disc 1 is placed on the turntable 3 for performing the reproducing operation, the focus control operation by the pickup control circuit 6 is performed, and the laser light emitted from the optical pickup 4 is focused on the signal surface. An operation for determining whether or not is performed is performed. When it is determined that such a focusing operation has been normally performed, it is recognized that the disc 1 is placed on the turntable 3. When such a recognition operation is performed, the spindle motor driving circuit 17 starts the rotation driving operation of the spindle motor 2 and the pickup control circuit 6 starts the tracking control operation.

  The rotational drive operation by the spindle motor drive circuit 17 is performed so that the linear velocity in the lead-in area falls within a predetermined range. When the focus control operation and the tracking control operation are performed on the disk 1 that is rotationally driven at such a speed, the read operation of the synchronization signal recorded in the pregroove formed on the disk 1 is performed. . When the synchronization signal reading operation is started, the synchronization signal extraction operation is performed in the digital signal processing circuit 8 and the synchronization processing of the synchronization signal and the synchronization signal output from the reference signal generation circuit is performed. Operation will be performed. Since such an operation is performed by a circuit called a PLL as is well known, the description thereof is omitted.

  As a result of the operation described above, it is possible to perform an operation of reading disc information recorded in the lead-in area of the disc 1. Such disc information indicates a recording position of a video signal or the like recorded on the disc 1. Since the position of the signal recorded on the disc 1 can be recognized in this way, a control operation based on a command signal output for performing a reproduction operation of desired information from the computer device 12 can be performed. .

  Such a reproduction operation is performed by using the address data obtained from the disk 1 and moving the optical pickup 4 to a position where a desired signal is recorded. Such an operation is generally called a search operation. ing. When the optical pickup 4 moves to a position where a desired signal is recorded by such a search operation, a signal reading operation from the disk 1 is started. The reproduction signal converted into an electrical signal by the photodetector incorporated in the optical pickup 4 is input to the RF signal amplification circuit 5 and binarized and output to the digital signal processing circuit 8.

When such a signal is input to the digital signal processing circuit 8, the decoding process is performed by the digital signal processing circuit 8, and the decoded reproduction signal is output to the signal reproduction circuit 9. When such a reproduction signal is input to the signal reproduction circuit 9, an error correction processing operation or the like is performed by the signal reproduction circuit 9, and this processing operation is performed by writing the reproduction signal to the reproduction buffer memory 10. And the read operation is repeated.

  As a result of the signal processing operation performed by the signal reproduction circuit 9, a video signal or audio signal is demodulated, and the video signal or audio signal is output to the computer device 12 via the interface circuit 13. . As a result of the reproduction signal being output to the computer apparatus 12, a video signal is displayed on a display provided in the computer apparatus 12, and an audio signal is emitted from a speaker. As a result of such an operation, the user can view a desired video signal or audio signal recorded on the disc 1, that is, for example, a movie.

  As described above, the reproducing operation in this embodiment is performed. Next, the recording operation will be described. When the recording disk 1 is placed on the turntable 3 to perform the recording operation, the focus control operation by the pickup control circuit 6 described above, the rotation drive operation of the spindle motor 2 by the spindle motor drive circuit 17, and the pickup control circuit 6. A tracking control operation is performed to read out the disk information. In this case, the reading operation is performed on a signal recorded in an area called PMA provided on the recording disk.

  In the PMA area provided on the disk 1 mounted on the turntable 3, position information of the signal recorded on the disk 1 is recorded, and the signal is recorded by recognizing such information. It is possible to perform a recognition operation such as where an area that can be recorded is, and how much recording capacity is available.

  When such a recognition operation is performed, an operation for setting a laser output suitable for the recording characteristics of the disk 1 is performed next. Such an operation is performed by recording a test signal while changing the laser output in a test writing area provided on the inner peripheral side of the disc 1 and determining whether the reproduction characteristics of the recorded test signal are good or bad. However, since such an operation can be performed using a known technique, the description thereof is omitted.

  When the operation described above is performed, a signal notifying that the recording operation can be performed is output from the system control circuit 11 to the computer device 12 via the interface circuit 13. By receiving such a signal, the computer apparatus 12 can recognize that the optical disk recording / reproducing apparatus is ready to perform a recording operation.

  In such a state, a recording command signal is output from the computer device 12 to the system control circuit 11, and a video signal or an audio signal received by a television tuner incorporated in the computer device 12 is output as a recording signal. Is done.

  When the system control circuit 11 receives such a command signal, a control operation for performing a recording operation based on program software stored in a ROM incorporated in the system control circuit 11 is started. Such an operation is performed by moving the optical pickup 4 to the recording start position on the disk 1. This operation is performed by the spindle motor driving circuit 17 for rotating the spindle motor 2 and the pickup control circuit 6 for optical driving. This is performed by the control operation of the pickup 4.

Since the recording start position can be obtained from the address information, the rotation speed of the spindle motor 2 can be controlled to be the linear speed at the recording start position. The optical pickup 4 is displaced to the recording start position by the displacement operation of the objective lens, that is, the track jump operation, when the recording start position is on the inner peripheral side, but when the recording start position is on the outer peripheral side, The recording head is displaced to the recording start position by a combination of the movement operation of the pickup body by the rotational drive of the pickup feeding motor and the track jump operation described above.

  The displacement operation to the recording start position of the optical pickup 4 is performed by the above-described operation, and the recording signal transmitted from the computer device 12 during the operation is performed by the interface circuit 13 and the system control circuit 11. And is written to the recording buffer memory 15 by the control operation by the signal recording circuit 14.

  FIG. 2 shows the storage state of the recording signal in the recording buffer memory 15. The hatched portion R indicates a region where the recording signal is stored, and the blank portion P indicates a region where no signal is stored. FIG. 2A shows that the amount of recording signals stored is smaller than that shown in FIG.

  The recording signal stored in the recording buffer memory 15 is read to perform a recording operation when the optical pickup 4 moves to a desired sector position which is a recording start position. The recording signal read from the buffer memory 15 is encoded by the signal recording circuit 14 and converted into a recording signal that conforms to the recording standard of the disc 1.

  The recording signal encoded by the signal recording circuit 14 is input to the laser diode driving circuit 16, and as a result, the laser diode incorporated in the optical pickup 4 from the laser diode driving circuit 16 responds to the recording signal. A drive signal, which is a pulse signal formed in this way, is supplied. Such a drive signal is supplied to the laser diode. Since the level of the drive signal is set to the laser output set by the above-described operation, the laser output that matches the recording characteristics of the disc 1 can be obtained. The recording operation to the disk 1 can be performed.

  As described above, a recording signal composed of a video signal and an audio signal output from the computer device 12 is temporarily stored in the recording buffer memory 15 and then read out, and is encoded by the signal recording circuit 14. To be recorded on the disc 1. While such a recording operation is being performed, a recording signal continuously output from the computer device 12 is continuously written into the recording buffer memory 15. Since the recording signal reading operation is continuously performed, the recording signal stored in the recording buffer memory 15 does not overflow.

  As described above, the operation when the recording operation is normally performed is performed. Next, the recording control method which is the gist of the present invention will be described. The recording operation described above is an operation when the optical pickup 4 is moved to the recording start position performed at the start of recording, that is, when the search operation is promptly performed. An operation in the case where the search operation is not performed promptly due to deterioration of the rotation characteristics or the like will be described.

If the position of a desired sector, which is the recording start position, is not detected despite the movement of the optical pickup 4 to the recording start position, the optical pickup 4 is moved to the recording start sector. Will be repeated. Such an operation is an operation called a retry, and the storage operation of the recording signal in the recording buffer memory 15 is performed even when the retry operation is performed. Accordingly, when a predetermined time elapses, the blank portion P, which is a storable area in the buffer memory 15, disappears, and the recording signal overflows.

  When such an overflow operation is performed, the recording operation of the overflowed recording signal on the disk 1 is not performed, and thus a problem that valuable signals are lost occurs. In order to solve such a problem, in the present invention, when a retry operation is performed, the capacity of the recording signal stored in the recording buffer memory 15 is detected, and the recording start position changing operation is performed based on the detected amount. Is configured to do.

  When the capacity of the recording signal stored in the recording buffer memory 15 is detected, the storage capacity can be recognized by subtracting the storage capacity of the recording signal from the storage capacity of the recording buffer memory 15. In this way, the storable capacity of the recording buffer memory 15 can be recognized, so whether to perform a retry operation or change the recording start position to the next sector according to the recognized capacity. The present invention is configured to select

  For example, in the state shown in FIG. 2A, that is, when there are many storable areas, the recording signal stored in the recording buffer memory 15 before the optical pickup 4 is moved to the recording start position by the retry operation. Since it is determined that there is no overflow, a retry operation to the recording start position is performed, and the state shown in FIG. 2B has a small storable area. Therefore, until the optical pickup 4 is moved to the recording start position by the retry operation. It is determined that the recording signal stored in the recording buffer memory 15 overflows, and an operation of changing the recording start position to the next sector is performed.

  When the optical pickup 4 is moved to the recording start position based on the recording start command, if the movement operation to the recording start position is not normally performed, the optical pickup 4 is moved again to the recording start position. The retry operation is performed. When the retry operation is performed, an operation for detecting the amount of the recording signal stored in the recording buffer memory 15 is performed.

  When the amount of the recording signal stored in the recording buffer memory 15 is the amount shown in FIG. 2A, the recording signal does not overflow during the retry operation. Then, the optical pickup 4 is moved to the recording start position. When the optical pickup 4 is normally moved to the recording start position by such an operation, the recording operation of the recording signal is performed from the recording start position.

  If the optical pickup 4 cannot be moved normally to the recording start position by the retry operation, the retry operation is performed again. In this case as well, the recording signal stored in the recording buffer memory 15 is changed. The operation of detecting the quantity is performed. When the amount of the recording signal is small, the movement operation to the recording start position described above is performed.

  Every time the above-described retry operation is performed, an operation for detecting the amount of the recording signal stored in the recording buffer memory 15 is performed. When the number of such retry operations increases, the operation is stored in the recording buffer memory 15. The amount of the recorded signal increases as shown in FIG. When it is detected by the detection operation that the amount of the recording signal stored in the recording buffer memory 15 is in the state shown in FIG. 2B, an operation for changing the recording start position to the next sector is performed.

When the recording start position is changed to the next sector, the movement of the optical pickup 4 to the changed sector is performed, and when the movement of the optical pickup 4 to the changed sector is normally performed, the change is performed. A recording signal is recorded from the sector. In this way, the recording operation to the disk 1 is started, but the operation of reading the recorded signal from the recording buffer memory 15 is performed based on the amount of the recording signal.

  Such a read operation of the recording signal is performed based on the time required for the movement operation of the optical pickup 4 to the changed sector, that is, when the movement operation to the changed sector is performed, the recording buffer memory 15 is read. Since there is a signal that overflows, the recording operation is performed by reading from the recording signal stored at the position where overflow does not occur. That is, in FIG. 2B, when it is determined that the recording signal stored in R1 overflows from the relationship with the time required for the moving operation of the optical pickup 4 when moving to the changed sector, The read operation of the recording signal stored in R2 is performed, and the change sector is recorded from the signal stored in R2. Similarly, when it is determined that the signals stored in R1 and R2 overflow, the recording signal stored in R3 is read, and recording is performed on the changed sector from the signal stored in R3. It will be.

  As described above, when the operation of changing the recording start position to the next sector is performed, the recording signal selection operation for recording is performed based on the amount of the recording signal stored in the recording buffer memory 15, and as a result It is possible to minimize the amount of signal discarded without performing any operation.

  If the operation of changing the recording start position to the next sector is performed but the optical pickup 4 cannot be moved normally to the changed sector, the recording operation cannot be performed normally. And the processing operation as a recording abnormality is performed. Such a processing operation is performed by outputting a signal notifying that the recording operation cannot be performed to the computer device 12 and switching the recording operation from the stopped state to the stopped state.

  When such a processing operation is performed, the user performs an operation for exchanging the disk and restarting the recording operation.

1 is a circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to a recording control method of the present invention. It is explanatory drawing for demonstrating operation | movement of this invention.

Explanation of symbols

1 disc
2 Spindle motor
4 Optical pickup
5 RF signal amplification circuit
6 Pickup control circuit
8 Digital Signal Processing Circuit 11 System Control Circuit 12 Computer Device 13 Interface Circuit 14 Signal Recording Circuit 15 Recording Buffer Memory 16 Laser Diode Drive Circuit

Claims (3)

A recording control method for an optical disc recording / reproducing apparatus configured to record a recording signal continuously transmitted from a host device on a disc in a sector unit, and recording for temporarily storing a recording signal transmitted from the host device When a movement to the recording start sector cannot be performed normally during the movement operation to the recording start sector of the optical pickup based on the recording start command, a retry operation is performed, and the recording is performed when the retry operation is performed. The amount of the recording signal stored in the buffer memory is detected, and when the detected amount of the recording signal exceeds a predetermined amount, the recording start position is changed to the next sector. Recording control method for optical disc recording / reproducing apparatus. When the operation of changing the recording start position to the next sector is performed, recording is started from the recording signals stored in the recording buffer memory based on the amount of the recording signal stored in the recording buffer memory. 2. The recording control method according to claim 1, wherein the operation of selecting a recording signal to be recorded on the disk is performed. 2. The recording control method according to claim 1, wherein when the moving operation to the next sector cannot be normally performed, the recording is processed as a recording abnormality.

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