JP3827193B2 - Optical disc recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disk recording system configured to record a signal on a disk by a light beam emitted from a laser element incorporated in an optical pickup and perform a reproduction operation of the signal recorded on the disk by the light beam. The present invention relates to a playback device.
[0002]
[Prior art]
Disc players that use optical pickups to read signals recorded on discs have become widespread, but recently, in addition to the playback function, the light emitted from the laser elements incorporated in the optical pickups An optical disc recording / reproducing apparatus configured to record a signal on a disc by a beam has been commercialized.
[0003]
Also, recently, signals can be recorded in a state where the disk is rotationally controlled at a constant high linear velocity such as 2 times, 4 times, 6 times and 8 times the prescribed recording linear velocity. A structured optical disc recording / reproducing apparatus has been developed.
[0004]
[Problems to be solved by the invention]
The optical disk recording / reproducing apparatus is configured to perform a signal recording operation in accordance with a recording command from the computer device side which is a host. Such a recording operation temporarily stores a signal to be recorded on the disk in a buffer RAM, A signal recording operation is performed on the disk by reading a signal stored in the buffer RAM.
[0005]
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 read operation is performed. The recording operation of the signal on the disc is performed in accordance with the amount of the recording signal and the recording state on the disc.
[0006]
When a signal recording operation is in progress, if a pickup tracking error or an abnormality occurs in the rotation characteristics of the disc, the signal recording operation cannot be performed on the disc. After that, the signal recording operation is performed again from the beginning. As a result, there is a problem that not only the signal that has been normally recorded before the recording abnormal state is wasted but also the recording operation is repeatedly performed, so that the efficiency is low.
[0007]
As a technique for improving such a problem, a technique has been developed in which a signal can be recorded following a signal that has been normally recorded on a disk before a recording abnormal state occurs. When a signal is recorded following the signal recorded on the disk before the recording operation is interrupted, a new signal is recorded following the recorded signal, but the rise characteristics of the laser elements that make up the optical pickup Due to the difference, the timing of recording on the disc is shifted, and there is a problem that a gap is generated between signals.
[0008]
The present invention is intended to provide an optical disc recording / reproducing apparatus capable of solving such a problem.
[0009]
[Means for Solving the Problems]
The present invention relates to an optical disk recording / reproducing apparatus configured to read a signal once stored in a buffer RAM and to record the signal on a disk by a light beam emitted from a laser element incorporated in an optical pickup. After the signal read from the buffer RAM is recorded on the disk during the signal recording operation, it is stored and held in the buffer RAM until a new signal is written in place of the signal recorded on the disk. When the recording operation is interrupted, a reproducing operation for detecting a position at which the recording operation is started is performed based on the last address of the normally recorded signal, and the signal reproduced by the reproducing operation and the buffer RAM are If both signals are determined to be the same signal by comparison with the stored signal In addition, the signal stored in the buffer RAM is read after the signal subjected to the comparison operation, and the signal recording is resumed continuously with the signal recorded on the disk before the recording is interrupted. At the same time, the gap between the signals recorded on the disk before and after the interruption of the recording is measured, and the start timing of the start-up operation of the laser element when the recording is resumed can be adjusted so that the gap is narrowed.
[0010]
【Example】
FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a disk placed on a turntable (not shown) that is rotationally driven by a spindle motor (not shown), and is configured to be rotationally driven by the rotation of the turntable. . Also. On the disc 1, position information data is recorded 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 element (not shown) for irradiating the disk 1 with a light beam, and a monitoring diode for monitoring the level of the light beam emitted from the laser element, and reflected from the signal surface of the disk 1. It is an optical pickup incorporating a photodetector that receives a light beam, and is configured to be moved in the radial direction of the disk 1 by a pickup feed motor (not shown).
[0011]
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 reference numeral 4 denotes the signal based on the signal obtained via the RF signal amplifying circuit 3. A pickup control circuit for performing focusing control for focusing the light beam output from the optical pickup 2 on the signal surface of the disc 1 and tracking control for causing the light beam to follow the signal track of the signal surface; a focus servo circuit; A tracking servo circuit is incorporated.
[0012]
Reference numeral 5 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplification circuit 3 and performs demodulation operations of various signals. Reference numeral 6 denotes a digital signal that is processed by the digital signal processing circuit 5. If the information recorded on the disc 1 is an audio signal, it is converted to an analog signal and then output to an amplifier or the like. In the case of a data signal such as computer software, it is digital. The signal is output to the computer device 7 provided as a host as a signal.
[0013]
A system control circuit 8 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. 9 is a signal recording circuit for recording a data signal or the like on the disk 1 by inputting a recording signal such as a test signal or an information signal and controlling the laser irradiation operation by the laser driving circuit 10 in response to the recording signal. It is.
[0014]
Reference numeral 11 denotes a buffer RAM in which a signal recorded on the disk 1 is temporarily stored. A signal output from the computer device 7 is written and a signal storing operation and a reading operation are controlled by a control operation of the system control circuit 8. It is configured to be. The signal stored in the buffer RAM 11 is still stored after being read out to be recorded on the disk 1, and then a new signal output from the computer device 7 is stored at that position. In this way, the information is sequentially overwritten and erased.
[0015]
Reference numeral 12 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 8 and has a function of controlling the rotational drive of a spindle motor that rotationally drives the disk 1. Such a rotational drive control operation can be rotated in a state where the linear velocity is constant such as twice, four times, six times and eight times the prescribed speed as well as the prescribed linear velocity. It is configured.
[0016]
In such a configuration, during the recording operation of the signal to the disk 1, the signal output from the computer device 7 is stored in the buffer RAM 11, and the reading operation of the stored signal is controlled to control the signal to the disk 1. The signal recording operation is controlled. When the signal recording operation on the disk 1 is interrupted and the recording operation is resumed, the signal stored in the buffer RAM 11 and the signal recorded on the disk 1 before the interruption are The comparison operation is performed so that the signal is recorded continuously with the signal recorded before the interruption, that is, the signal is recorded by a method called seamless.
[0017]
Further, while the signal recording operation to the disk 1 is being performed, the memory circuit provided in the system control circuit 8 is configured to store the final address of the position where the normal recording operation has been performed. Yes. If the recording operation is interrupted due to an abnormality during the recording operation, the signal can be recorded seamlessly from the position where it was interrupted based on the final address stored in the memory circuit. Has been.
[0018]
The operation of resuming the recording operation after the signal recording operation on the disk 1 is interrupted is a comparison operation between the signal stored in the buffer RAM 11 and the signal recorded on the disk 1 before the interruption. However, the driving operation of the laser element by the laser driving circuit 10 is set in consideration of the rising characteristics of the laser element. That is, even when a command signal for outputting a signal for driving the laser element to the laser driving circuit 10 is applied from the system control circuit 8, the laser element is in an operating state and the light beam level is transmitted to the disk 1. Although it takes a short time before recording can be performed, a time that cannot be ignored is required, and the time is set in consideration of the delay time.
[0019]
Since the rising characteristics of the laser elements differ depending on the characteristics of the individual laser elements, the timing of the command signal output from the system control circuit 8 to the laser driving circuit 10 can be adjusted by an output adjustment circuit or the like. Yes.
[0020]
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 reproduction operation is output from the computer device 7 to the system control circuit 8 constituting the drive device, the control operation for the reproduction operation by the system control circuit 8 is started. When such a reproduction operation is performed, the laser drive circuit 10 is supplied with a drive current for obtaining a laser output for performing a signal read operation to the laser element incorporated in the optical pickup 2. Is set to
[0021]
When the control operation for such a reproduction operation is started, the spindle motor drive circuit 12 performs a spindle motor rotation control operation. The spindle motor rotation control operation is obtained by decoding a wobble signal. The disk 1 is driven to rotate at a constant linear velocity by comparing the synchronization signal with a reference signal output from a reference signal generation circuit (not shown). Such a control operation is similarly performed during a signal recording operation described later.
[0022]
The rotation control operation of the spindle motor is performed as described above. In the optical pickup 2 that performs the signal reading operation, the focusing control operation and the tracking control operation are started, and the signal from the disc 1 by the optical pickup 2 is started. Although the read operation is started, the read operation of the TOC data recorded in the lead-in area constituting the first session of the disc 1 is performed prior to the reproduction operation.
[0023]
The read / play 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 out by the optical pickup 2 is amplified and waveform-shaped through the RF signal amplifier circuit 3, and then input to the digital signal processing circuit 5, where the signal is demodulated. When signal processing is performed by the digital signal processing circuit 5 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 6.
[0024]
When the information data read from the disk 1 is an audio signal, the signal reproducing circuit 6 converts the information data into an analog signal and outputs it to an amplifier or the like. Is output to the computer device 7 as a digital signal.
[0025]
As described above, the reproduction operation in this embodiment is performed. Next, the signal recording operation on the disk 1 will be described.
[0026]
In the operation of recording a signal on the disk 1, first, a drive current that provides an optimum laser output for the recording operation by recording and reproducing a test signal in a test writing area provided on the disk 1 is supplied to the laser element. Is set as follows. When such a laser output setting operation is performed, an operation of reading information data recorded in an area called a buffer of the disk 1, that is, position information of a signal recorded in the signal recording area is performed.
[0027]
Based on the information data read out in this manner, a data signal recording operation can be performed in the signal recording area provided on the disc 1, and a recognition operation such as where the recording operation is performed is performed. Done.
[0028]
When such a recognition processing operation is completed, the optical pickup 2 is moved to a position where the recording operation on the disk 1 is started, and a recording signal writing operation to the buffer RAM 11 is performed. When a signal writing operation to the buffer RAM 11 is performed, the storage amount of the signal stored in the buffer RAM 11 gradually increases. When the storage amount exceeds a predetermined amount, the signal stored in the buffer RAM 11 is read, and the read signal is input to the signal recording circuit 9. As a result, the control operation of the laser drive circuit 10 by the signal recording circuit 9 is performed, and a signal is recorded on the disk 1.
[0029]
By such an operation, a signal recording operation to the disk 1 is performed, but a signal writing operation to the buffer RAM 11 is performed in accordance with a signal reading operation from the buffer RAM 11. . In a state where the recording operation is normally performed, an operation for storing an address indicating the position, that is, a final address in the memory circuit is performed every time a signal recording operation to the disk 1 is performed.
[0030]
When the signal recording operation to the disk 1 is interrupted, the signal reading operation from the buffer RAM 11 is interrupted. In this case, the signal writing operation to the buffer RAM 11 is also interrupted. It is configured to let you. When an operation for starting a signal recording operation on the disk 1 is performed from such a state, after the optical pickup 2 is displaced to a position where the recording operation is started, that is, a position retracted from a position where the recording operation is interrupted, Playback operation is performed from that position. The position where the recording is interrupted can be easily recognized from the final address stored in the memory circuit every time the normal recording operation is performed, and the optical pickup 2 can be moved to a desired position.
[0031]
The signal reproduced by such a reproduction operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and a signal stored and held in the buffer RAM 11 is performed. When it is determined by such a comparison operation that both are the same signal, reading of the signal stored in the buffer RAM 11 and subsequent to the signal subjected to the comparison operation described above is read. As the operation is performed, the signal is input to the signal recording circuit 9 and the recording operation of the signal on the disk 1 is started. By the above-described operation, the recording interruption operation and the recording resumption operation of the signal to the disc 1 can be performed. By performing such an operation, the signal is continuously supplied to the disc 1 even though the recording operation is interrupted. Recording operation, so-called seamless recording operation can be performed.
[0032]
As described above, the signal recording operation in this embodiment is performed, but the signal is recorded on the disk 1 due to a servo abnormality or the like in the state where the signal recording operation is performed on the disk 1 next. A description will be given of the operation when it becomes impossible to perform the operation.
[0033]
When a signal cannot be recorded on the disk 1 while the signal recording operation is being performed, a signal recording operation on the disk 1 is performed by the function of the system control circuit 8 based on the signal output from the computer device 7. A processing operation for interrupting is performed. Further, when a processing operation for interrupting the signal recording operation to the disk 1 is performed, the signal writing operation to the buffer RAM 11 is also stopped, but the buffer RAM 11 performs recording on the disk 1 before the recording operation is interrupted. The recorded signal and the signal written to be recorded on the disk 1 are stored and held. The final address is stored in the memory circuit incorporated in the system control circuit 8.
[0034]
When the signal recording operation cannot be performed on the disk 1 as described above, the above-described processing operation is performed. The system control circuit 8 performs a recovery operation of the servo circuit that has become abnormal, and the like. A processing operation for resuming the signal recording operation to 1 is performed. When a signal can be recorded on the disk 1 by such a re-setting operation, the recording operation is started at the position where the optical pickup 2 starts the recording operation from the final address stored in the memory circuit, that is, the abnormal operation. After being displaced to a position retracted from the interrupted position, a reproduction operation is performed from that position.
[0035]
A signal reproduced by such a reproducing operation is a signal recorded immediately before the recording operation is interrupted, and a comparison operation between the signal and a signal stored in the buffer RAM 11 is performed. When it is determined by such a comparison operation that both are the same signal, reading of the signal stored in the buffer RAM 11 and subsequent to the signal subjected to the comparison operation described above is read. As the operation is performed, the signal is input to the signal recording circuit 9 and the recording operation of the signal on the disk 1 is started. By the above-described operation, the recording interruption operation and the recording resumption operation of the signal to the disc 1 can be performed. By performing such an operation, the signal is continuously supplied to the disc 1 even though the recording operation is interrupted. Recording operation, that is, seamless recording operation can be performed.
[0036]
As described above, the operation for resuming the recording operation after the recording operation of the signal on the disk 1 is interrupted is performed, but the signal recorded on the disk 1 before the interruption is stored in the buffer RAM 11. The comparison operation with the signal is performed in units of frames constituting the signal to be recorded. When the recording operation is resumed, a signal recorded on the disk 1 is obtained by performing a comparison operation between the signal recorded on the disk 1 before the interruption and the signal stored in the buffer RAM 11 in units of frames. The signal following the signal is read from the buffer RAM 11 and the signal is input to the signal recording circuit 9 to perform a seamless recording operation in which the signal is recorded following the signal recorded on the disk 1.
[0037]
Then, a comparison operation is performed between the signal recorded on the disk 1 before the interruption and the signal stored and held in the buffer RAM 11, and it is recognized that the signal is started from the next frame from the compared signal. Therefore, the time from the leading edge position of the previous frame to the leading edge position of the next frame, that is, the position where the signal recording operation is started can be recognized. Accordingly, in consideration of the relationship between the timing of starting signal recording and the rising characteristics of the laser element, the system control circuit 8 is set at a timing at which the laser driving circuit 10 is brought into an operation state for supplying a driving signal for performing a recording operation to the laser element. Further, it is possible to set so that a command signal is output to the laser driving circuit 10.
[0038]
By setting in this way, it is possible to perform the driving operation of the laser driving circuit 10 in consideration of the time required until the signal recording operation can be performed by the rising characteristics of the laser element, that is, the delay time. As a result, the signal recorded on the disk 1 before the interruption can be continuously recorded without leaving a gap, and a satisfactory seamless recording operation can be performed.
[0039]
The timing adjustment of the command signal output from the system control circuit 8 to bring the laser drive circuit 10 into an operating state is performed by recording the signal on the disk 1 and then reading the signal and measuring the gap between the signals. However, it can be performed by adjusting so that the gap becomes the narrowest.
[0040]
In this embodiment, the case where the signal recording operation on the disk 1 is interrupted due to a servo error has been described. However, the disk 1 is rotated at a high speed such as 8 times the specified speed. When performing the recording operation, there is a shortage of information to be written in the buffer RAM 11, and this lack of information causes a phenomenon that the signal recording operation to the disk 1 is interrupted. The same operation can be performed with respect to the recording resuming operation accompanying this.
[0041]
【The invention's effect】
In the present invention, when a signal reproduced by a reproducing operation for detecting a position for starting a recording operation and a signal stored in the buffer RAM are compared to each other, it is determined that they are the same signal. In addition, the signal stored in the buffer RAM is read after the signal subjected to the comparison operation, and the signal recording is resumed continuously with the signal recorded on the disk before the recording is interrupted. At the same time, the gap between the signals recorded on the disk before and after the recording interruption is measured, and the start timing of the laser element when recording resumes can be adjusted so that this gap is narrowed. In addition to ensuring the continuity of the signal, even if the rise characteristics of the laser elements vary, there is a gap between the signal and the signal that was recorded on the disk before the recording was interrupted. Ku is advantageous to record.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to the present invention.
[Explanation of symbols]
1 Disk 2 Optical Pickup 4 Pickup Control Circuit 5 Digital Signal Processing Circuit 7 Computer Device 8 System Control Circuit 9 Signal Recording Circuit 10 Laser Drive Circuit 11 Buffer RAM

Claims (1)

Signal recording operation in an optical disc recording / reproducing apparatus configured to read a signal once stored in a buffer RAM and record the signal on a disc by a light beam irradiated from a laser element incorporated in an optical pickup After the signal read from the buffer RAM is recorded on the disk, it is stored and held in the buffer RAM until a new signal is written in place of the signal recorded on the disk. When the operation is interrupted, a reproduction operation for detecting a position to start the recording operation is performed based on the final address of the normally recorded signal, and the signal reproduced by the reproduction operation and the buffer RAM are stored and held. When it is determined that both are the same signal by the comparison operation with the signal Following the target became signal較動operation reads the signal stored in RAM for the buffer, as to resume the recording of the signal before recording interruption continuously to the signal recorded on the disc, the recording An optical disc recording / reproducing apparatus characterized in that the gap between the signals recorded on the disc before and after the interruption is measured, and the start operation start time of the laser element at the time of resuming recording can be adjusted so that the gap becomes narrower .

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