JP3969937B2 - Recording control method for optical disc recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disk recording / reproducing apparatus configured to record a signal on a disk with a laser beam irradiated from an optical pickup and perform a reproducing operation of the signal recorded on the disk with the laser beam.
[0002]
[Prior art]
Disc players that use an optical pickup to read out the signals recorded on the disc have become widespread, but recently, in addition to the playback function, signals are recorded on the disc by laser light emitted from the optical pickup. An optical disk recording / reproducing apparatus configured so as to be able to be used has been commercialized.
[0003]
As an optical disc recording / reproducing apparatus capable of recording a signal on a disc, a method called CD-R, that is, a method capable of recording a signal only once, and a method called CD-RW, ie, recording a repetitive signal. There is something that can be done.
[0004]
[Problems to be solved by the invention]
An optical disc recording / reproducing apparatus capable of repeatedly recording a signal stores information data indicating the position of the signal recorded on the disc in a buffer area called PMA provided inside the lead-in area provided on the disc. Recording is performed, and a signal recording operation is performed based on the recorded signal. In such an apparatus, the operation of erasing the signal recorded on the disk is performed by erasing the information data recorded in the buffer area. That is, the signal is actually recorded in the signal recording area provided on the disc, but the information data indicating the recording position is erased, so that the disc has no signal recorded. It becomes the same state.
[0005]
An operation in the case of recording a signal on a disk on which a signal erasing operation has been performed by the above-described operation will be described with reference to the recording format shown in FIG. FIG. 3A shows a disk from which information data recorded in the buffer area B has been erased. A lead-in area L is provided on the outer peripheral side of the buffer area B, and the outer side thereof is shown in FIG. A signal recording area in which signals are recorded is provided. In FIG. 3A, the signal recording area is provided with a pause portion P1 of 2 seconds and a signal of the first track N1 is recorded from T1 to T2, and a pause portion P2 is provided on the outside thereof from T3. A signal of the second track N2 is recorded.
[0006]
A case will be described in which a signal is recorded on a disc in which a signal is recorded as shown in FIG. First, the case where the recording time of a signal newly recorded as the first track is longer than the recording time previously recorded as the first track N1 will be described.
[0007]
In such a recording operation, a pause portion P1 of 2 seconds is provided outside the lead-in area L, and a signal newer than the outside, that is, the position of T1, is recorded as the first track S1. FIG. 3B shows the state recorded in this way, and a new signal is recorded from the position T1 to the position T4. As is clear from this figure, the signal that has been recorded as the first track N1 so far is overwritten with the signal of the first track S1, and is erased. On the other hand, a part of the signal recorded as the second track N2, that is, the signal recorded outside the position of T4 is not overwritten, so it is not erased and remains as a recording signal on the disc. It becomes a state.
[0008]
A new signal is recorded as the first track S1, and when the signal recorded on the first track S1 is reproduced, the signal of the second track N2 is reproduced at the position T4. In this case, since the track number recorded as information data changes from 1 to 2, it is recognized that the signal of the first track S1 has been recorded up to the position of T4. Therefore, the position information of T4 can be recorded as information data in the buffer area B, and a new signal can be recorded as the second track outside T4 based on the recorded signal.
[0009]
The operation when the recording time of the signal newly recorded as the first track is longer than the recording time previously recorded as the first track N1 is performed as described above. Next, the signal newly recorded as the first track The operation when the recording time is shorter than the recording time previously recorded as the first track N1 will be described.
[0010]
In such a recording operation, a pause portion P1 of 2 seconds is provided outside the lead-in area L, and a signal newer than the outside, that is, the position of T1, is recorded as the first track M1. FIG. 3C shows the state recorded in this way, and a new signal is recorded from the position T1 to the position T5. As is apparent from the figure, the recorded signal of the portion from T1 to T5 in the signal that has been recorded as the first track N1 until then is overwritten and thus erased, but from T5 to T2 Since the signal recorded on the disc is not overwritten, it is not erased and remains on the disc as a recording signal.
[0011]
A new signal is recorded as the first track M1, and when the reproduction operation of the signal recorded in the first track M1 is performed, the signal of the first track N1 is reproduced at the position T5. In this case, since the track number recorded as the information data is 1 and the position information data is continuously reproduced, it is impossible to recognize where the first track M1 has ended. Therefore, there is a problem that the position information of T5, which is the end position of the first track M1, cannot be recorded as information data in the buffer area B.
[0012]
The present invention is intended to provide a recording control method for an optical disc recording / reproducing apparatus that solves such problems.
[0013]
[Action]
The present invention records information data indicating the position of a signal recorded after performing a signal recording operation on the disk in a buffer area provided on the disk, and based on the information data recorded in the buffer area. In the optical disk recording / reproducing apparatus configured to perform the signal recording operation and to erase the signal recorded on the disk by erasing the information data recorded in the buffer area, the buffer area When the signal is recorded again at the position where the information data recorded in is erased, the recording start position is shifted and recorded by shifting the absolute time address of the recording start position with respect to the signal recorded so far, the newly recorded signal and discontinuous relative time addresses starting from the recording start position of the recording once was signals so far new It is to recognize the recording end position of the Ku recorded signal tracks.
[0014]
【Example】
FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus according to the present invention, and FIG. 2 is a recording format for explaining a recording control method of the present invention.
[0015]
In FIG. 1, reference numeral 1 denotes a disk that is placed on a turntable 3 that is rotationally driven by a spindle motor 2 and that is rotationally driven by the rotation of the turntable 2. Position information data is recorded by grooves called wobbles. The signal recording / reproducing operation is performed based on the wobble signal obtained from the groove. Reference numeral 4 denotes a laser element for irradiating the disk 1 with a laser beam and a monitoring diode for monitoring the laser beam irradiated from the laser element, and a photodetector for receiving the laser beam reflected from the signal surface of the disk 1. An optical pickup incorporated therein is configured to be displaced in the radial direction of the disk 1.
[0016]
5 RF signal amplifier circuit for waveform-integer form amplifies the RF signal obtained from the photodetector incorporated in the optical pickup 2, 6 based on a signal obtained via the RF signal amplifier circuit 5 It is a pickup control circuit that performs a focusing control operation for focusing the laser light emitted from the optical pickup 4 on the signal surface of the disk 1 and a tracking control operation for causing the laser light to follow a signal track on the signal surface.
[0017]
7 is a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplification circuit 5 and performs demodulation operations of various signals, and 8 is a digital signal input by the digital signal processing circuit 7. The signal reproduction circuit incorporates a DA converter that converts an input digital signal into an analog signal, and the output signal is output to an amplifier.
[0018]
An operation circuit unit 9 is provided for switching the operation of the optical disc recording / reproducing apparatus, and has a function for editing the recording operation. Reference numeral 10 denotes a recording signal input circuit to which a recording signal output from an external device is input. Reference numeral 11 denotes a signal demodulated by the digital signal processing circuit 7 and is output from the operation circuit unit 9. A buffer RAM 12 for temporarily storing a recording signal input from the recording signal input circuit 10 is incorporated. The system control circuit performs various control operations in response to the operation switching control signal.
[0019]
Reference numeral 13 denotes a laser driving circuit for supplying a driving signal to a laser element incorporated in the optical pickup 4, and 14 denotes a laser output control circuit whose operation is controlled by the system control circuit 11. It is configured to set the output of the laser by controlling. Reference numeral 15 denotes a test signal or a recording signal read from the buffer RAM 12, and controls the laser driving operation of the laser driving circuit 13 in response to the signal to thereby output the recording signal to the disk 1. This is a signal recording circuit to be recorded.
[0020]
Reference numeral 16 denotes a spindle motor drive circuit that drives and controls the rotation speed of the spindle motor 2 so as to be a linear speed suitable for a recording operation. The spindle motor drive circuit 16 is configured to be controlled by the system control circuit 11.
[0021]
In such a configuration, the recording signal input via the recording signal input circuit 10 is temporarily stored in the buffer RAM 12, and then read out from the buffer RAM 12 and recorded on the disk 1. It is configured.
[0022]
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 the switching signal for reproduction output from the operation circuit unit 9 is input to the system control circuit 11, the control operation for the reproduction operation by the system control circuit 11 is started. When such a reproduction operation is performed, a laser drive circuit 13 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 4. Is set to
[0023]
When the control operation for the reproduction operation is started, the spindle motor drive circuit 16 performs the rotation control operation of the spindle motor 2 and the optical pickup 4 starts the focusing control operation and the tracking control operation. A signal reading operation from the disk 1 by the optical pickup 4 is started. The signal read out by the optical pickup 4 is input to the digital signal processing circuit 7 through the RF signal amplification circuit 5, and the signal is demodulated. When signal processing is performed by the digital signal processing circuit 7 and a signal is extracted, the signal is subjected to signal processing such as error correction and then applied to the signal reproduction circuit 8. The signal reproduction circuit 8 converts an input digital signal into an analog signal by a DA converter and then outputs the analog signal to an amplifier. Therefore, the user can reproduce and listen to music and other signals recorded on the disc 1.
[0024]
In such a circuit configuration, when the disk 1 is inserted into the disk mounting portion in order to perform a signal recording operation, a laser output setting operation is performed. Such a laser output setting operation is performed based on a program stored in a memory circuit provided in the system control circuit 11. In the setting operation of the laser output, the magnitude of the drive current supplied from the laser drive circuit 13 to the laser element incorporated in the optical pickup 4 by the control signal output from the laser output control circuit 14 is stepwise. The test signal is recorded in a test writing area provided on the inner peripheral side of the disc 1 while the recorded signal is reproduced while changing the signal.
[0025]
When the magnitude of the drive current supplied to the laser element is changed stepwise, the output of the laser beam output from the laser element changes, and the level of the signal recorded on the disk 1 also changes. Then, the level of the signal recorded on the disk 1 with respect to the laser output is detected, and when the level of the reproduced signal reaches a desired value, the laser output at that time is set as the laser output for performing the recording operation. Since the laser output setting operation described above can be performed using a known technique, the description thereof is omitted.
[0026]
The recording operation of the signal to the signal recording area is started by the laser output set in this way. When such a signal recording operation is performed, a change in the laser beam reflected from the disk 1 is monitored. By doing so, the value of the drive current supplied from the laser drive circuit 13 to the laser element is changed, and the laser output is always adjusted to be optimal for the recording operation.
[0027]
As described above, the test signal recording operation in the test writing area and the signal recording operation in the signal recording area are performed. In order to perform such a recording operation, the laser driving circuit 13 supplies the laser element to the laser element. A control operation by a laser servo circuit (not shown) is always performed on the drive signal.
[0028]
A recording signal output from an external disk player or the like is stored in the buffer RAM 12 via the recording signal input circuit 10. The recording signal stored in the buffer RAM 12 is read out and input to the signal recording circuit 15 when performing a recording operation on the disk 1. As a result of the recording signal input to the signal recording circuit 15 being applied to the laser driving circuit 13, a driving signal corresponding to the recording signal is supplied from the laser driving circuit 13 to the laser element constituting the optical pickup 4 and the disk. The signal recording operation to 1 is performed.
[0029]
As described above, the recording operation in this embodiment is performed. Next, the recording control method which is the gist of the present invention will be described with reference to the recording format shown in FIG.
[0030]
FIG. 2A shows a disk from which the information data recorded in the buffer area B has been erased. A lead-in area L is provided on the outer peripheral side of the buffer area B, and the outside thereof is shown in FIG. A signal recording area in which signals are recorded is provided. In FIG. 2A, a signal recording area is provided with a pause portion P1 of 2 seconds and a signal of the first track A1 is recorded from T1 to T2, and a pause portion P2 is provided outside thereof from T3. A signal of the second track A2 is recorded.
[0031]
The operation for recording the signal on the disc in which the signal is recorded as shown in FIG. 2A is performed as follows. Since the information data recorded in the buffer area B provided on the disk 1 has been erased, it cannot be recognized whether or not a signal is recorded in the signal recording area of the disk 1.
[0032]
In such a case, since the start position of the signal recording area provided on the disk 1 is defined by the format, the optical pickup 4 is moved to that position to start the signal reproduction operation. When a signal is recorded on the first track A1 when such a reproduction operation is started, the signal is output from the RF signal amplifier circuit 5, and therefore the absolute time that is information data is demodulated by demodulating the signal. That is, the absolute time address AT which is the elapsed time starting from the start position T0 of the signal recording area and the relative time, that is, the recording start position T1 of the first track A1.
The relative time address At, which is the elapsed time starting from, can be read.
[0033]
By subtracting the relative time address At from the absolute time address AT thus read, the absolute time address A that is the absolute time of the recording start position T1 of the first track A1 can be recognized. The absolute time address A of the recording start position T1 of the first track A1 recognized in this way is stored in a memory circuit (not shown) incorporated in the system control circuit 11.
[0034]
After performing the above-described operation, a signal recording operation is performed. Such a recording operation is a physical position obtained by increasing the absolute time address by α to the absolute time address A recognized by the above-described operation. It starts from the position of T4. In such a case, the recording operation is such that a pause portion P3 that is longer than α by 2 seconds is provided outside the lead-in area L, and a signal newer than the outside, that is, the position of T4 is recorded as the first track C1. . FIG. 2B shows the state recorded in this way, and a new signal is recorded from the position T4 to the position T5.
[0035]
As apparent from the figure, the recording signal of the portion from T1 to T5 in the signal that has been recorded as the first track A1 so far is overwritten and thus erased, but from T5 to T2. Since the signal recorded on the disc is not overwritten, it is not erased and remains on the disc as a recording signal.
[0036]
A new signal is recorded as the first track C1, and when the signal recorded on the first track C1 is reproduced, the signal of the first track N1 is reproduced at the position T5. In this case, although the track number recorded as information data is the same as 1, the address that is position information data, that is, the relative time is different, the reproduced relative time address is discontinuous. Therefore, it is possible to recognize where the first track C1 has ended, and the position information of T5, which is the end position of the first track C1, can be recorded as information data in the buffer area B.
[0037]
As described above, even if the recording end position of the first track is located on the first track that has been recorded, the absolute position address of the recording start position is shifted. Information data can be recorded in the buffer area B, and a new signal can be recorded as the second track on the outer peripheral side of T5 based on the recorded signal.
[0038]
As described above, the absolute position address of the recording start position of the first track C1 is added to the absolute position address A of the recording start position T1 of the first track A1 recorded so far. α is set by the number of frames. That is, in the disc standard called CD, the signal recording start position of the signal recording area is defined as 2 to 3 seconds from the start position T0 of the signal recording area. That is, the time of the pause portion P1 is defined to be 2 to 3 seconds.
[0039]
In this embodiment, the case where the start position of the first track is shifted to the outer peripheral side from the start position of the signal recorded so far has been described. However, when the first track can be shifted to the inner peripheral side, that is, the inner peripheral side. If the time of the pause portion P1 does not become 2 seconds or less even after shifting the predetermined number of frames, it can be shifted to the inner circumference side.
[0040]
【The invention's effect】
In the present invention, when the signal is recorded again at the position where the information data recorded in the buffer area is erased, the recording start position is shifted by shifting the absolute time address of the recording start position with respect to the signal recorded so far. The recording end position of the newly recorded signal track is recognized due to the discontinuity of the relative time address between the newly recorded signal and the previously recorded signal. Even if the track number of the recorded signal is the same as the track number of the signal recorded so far, it is possible to reliably recognize the recording end position of the newly recorded signal track. Therefore, a signal can be recorded on the disc from which the information data recorded in the buffer area has been erased, and the recording operation of the information data indicating the position of the recorded signal in the buffer area can be performed without any trouble.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing an embodiment of an optical disc recording / reproducing apparatus according to a recording control method of the present invention.
FIG. 2 is a recording format for explaining a recording control method of the present invention.
FIG. 3 is a recording format for explaining a conventional recording control method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc 2 Spindle motor 4 Optical pick-up 6 Pick-up control circuit 7 Digital signal processing circuit 9 Operation circuit part 10 Recording signal input circuit 11 System control circuit 13 Laser drive circuit

Claims (2)

After performing a signal recording operation on the disc, information data indicating the position of the recorded signal is recorded in a buffer area provided on the disc, and a signal is recorded based on the information data recorded in the buffer area. In an optical disc recording / reproducing apparatus configured to perform an operation and to erase the signal recorded on the disc by erasing the information data recorded in the buffer region, the data recorded in the buffer region is recorded. When the signal is recorded again at the position where the information data is erased, the recording start position is shifted by shifting the absolute time address of the recording start position with respect to the signal that has been recorded so far, and newly recorded newly recorded is the signal discontinuous relative time addresses starting from the recording start position of the signal recorded so far Recording control method of the optical disc recording and reproducing apparatus being characterized in that the to recognize recording end position of the signal track. To claim 1, characterized in that the absolute time address or we rewrite signal shifted a predetermined number of frames with respect to the absolute time address of the recording start position of the signal recorded on a position for recording signals to be recorded The recording control method described.

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