JP2000149263A - Optical disk recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable DRAW by securing continuity of recording data without employing a packet write method even in a situation in which a buffer-under-run error is generated. SOLUTION: In the optical disk recording device, the data corresponding to the light output of an optical head 1 that is set by a light output setting circuit 15 when the recording of data onto a disk is interrupted by a recording control means 20 are stored in a storage means 16, the light output setting circuit 15 is set so that the data stored in the storage means 16 is read out when the recording s resumed by the recording control means 20, and the light beam of the light output corresponding to the data so read out is emitted from the optical head 1. As a result, the recording data are recorded by the light output suitable for the recording of the disk immediately after the resumption of the recording, and the continuity of the recording data is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording input data on a disk by using a light beam emitted from an optical head. And an optical disk recording device.

[0002]

2. Description of the Related Art As a disk recording apparatus for recording recording data on a disk, there is known an optical disk recording apparatus that performs recording by changing the reflectance of a recording layer of a disk by irradiating the disk with a light beam from an optical head. Has been
Such an optical disk recording apparatus handles a so-called write-once medium in which data once recorded cannot be physically erased, that is, a CD-R (Compact Disc) family CD-R ( Reco
rdable) drives are well known.

[0003]

In a write-once medium such as a CD-R, a buffer underrun occurs in which a data transfer rate of input data is slower than a data transfer rate of recording data on the medium. The recording data to be recorded is interrupted and the buffer underrun
If an error occurs, disc at once (disc at
When a group of files to be written in advance is designated, such as once at) or track at once, there is a problem that the recording medium cannot be used.

[0004] This buffer underrun error is caused by C
In the current environment, the recording speed of the DR drive has been increased to 4 times or 8 times the standard speed, and the number of opportunities to operate using the multitasking function on personal computers is increasing. The environment is more likely to occur.

On the other hand, since recording can be performed in packet units by using the packet write method, a buffer underrun error can be prevented from occurring by recording data after recording until the data to be recorded has a packet unit capacity.

Incidentally, it is necessary to maintain compatibility so that a disc recorded by a CD-R drive can be reproduced by a CD-ROM drive. However, it is not always true that a CD-ROM drive is compatible with packet writing. There was a problem in terms of compatibility as well.

[0007] When audio data is recorded in a CD-R drive corresponding to the CD-DA, the CD-DA
The packet write method cannot be adopted from the viewpoint of compatibility with the player.

[0008] In addition, since the packet write needs to form a link block for connection between packets, it is disadvantageous in terms of the storage capacity of the disk.

Therefore, even in a situation where a buffer underrun error occurs, an optical disc recording apparatus capable of performing additional recording while ensuring continuity of recording data without employing a packet write method has been developed. Is desired.

[0010]

SUMMARY OF THE INVENTION The present invention provides a light output setting circuit for controlling a light source driving circuit to set the light output of an optical head, and a light output setting circuit for setting the light output of the optical head. Storage means for storing the corresponding data, and recording control means for controlling recording interruption and resumption of recording of the recording data on the disk, wherein the recording control means interrupts the recording of the recording data on the disk. Data corresponding to the light output of the optical head set by the light output setting circuit is stored in the storage means, and the data stored in the storage means is read out when the recording control means resumes recording. The light output setting circuit is set so that a light beam having a light output corresponding to the data is emitted from the optical head, and the light output of the optical head at the time when the recording is interrupted is recorded. So that the initial value of the light output of the optical head at the time of resumption.

[0011]

FIG. 1 is a circuit block diagram showing an example of a CD-R drive as an embodiment of an optical disk recording apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes an optical head which emits a laser beam for tracing a disk, and writes and reads recording data to and from a disk. An RF amplifier that amplifies an RF signal (high-frequency signal), binarizes the RF signal, and outputs it as digital data, 3 feeds back the output of the optical head 1 via the RF amplifier 2, and outputs a laser beam to a disk signal. A head servo circuit that performs focusing control for focusing on a surface and tracking control for causing a laser beam to follow a signal track of the disk, and also performs thread feed control for sending the optical head 1 itself in the radial direction of the disk.

Reference numeral 4 denotes a decoder for performing signal processing for demodulating digital data output from the RF amplifier 2, and reference numeral 5 denotes a subcode demodulation circuit for demodulating separated subcodes.

6 extracts a wobble component of 22.05 kHz from a pre-groove signal of the disk obtained through the RF amplifier 2, generates a component necessary for controlling the rotation of the disk, and generates a wobble component. ATI from ingredients
ATI that demodulates P (Absolute Time In Pre-groove)
This is a wobble decoder including a P demodulation circuit 7.

Reference numeral 8 denotes an interface for controlling the transfer of data to and from a personal computer 10 serving as a host connected to the outside via the connection terminal 9. Reference numeral 11 records the input data input via the interface 8 on a disk. An encoder 12 for modulating recording data is an input data RAM for storing input data modulated by the encoder 11.

When performing modulation based on the CD-ROM standard, the encoder 11 applies a sync, a header, and EDC (Er Er) of an error detection code for CD-ROM data to input data.
rorDetection Code) and ECC (Error
Correction Code), and then CIRC (Cross Interleaved Reed-Sol
omon Code (short for Eight to Fourteen Modulation)
Processing is performed, and a synchronization signal is added.

Reference numeral 13 denotes an internal RAM provided inside the encoder 11 and used for modulation processing by the encoder 11;
Reference numeral 14 denotes a laser driving circuit for driving a laser light source of the optical head 1 to perform recording on a disk based on the recording data of the EFM data output from the encoder 11.
5 is a laser drive circuit 1 for monitoring the amount of light reflected from the disk and the output of the laser light source of the optical head 1.
A laser output setting circuit for controlling a laser output of the laser beam emitted from the optical head 1 by controlling the laser output 4;
Reference numeral 6 denotes a laser output memory for storing control data for controlling the laser drive circuit 14 by the laser output setting circuit 15.

The laser output setting circuit 15 controls the laser driving circuit 14 based on control data so as to set the laser output of the laser beam emitted from the optical head 1, and controls the laser driving circuit 14 when the laser driving circuit 14 is controlled. The data is stored in the laser output memory 16 independently of the laser output during recording and the laser output during reproduction.

Reference numeral 17 denotes a system control circuit for performing system control relating to recording and reproduction of a disk. The system control circuit 17 includes the laser output memory 16.

The system control circuit 17 includes a subcode address of the absolute time information in the subcode (sub Q data) demodulated by the subcode demodulation circuit 5 and an absolute time information in the ATIP demodulated by the ATIP demodulation circuit 7. An access control means for selectively referring to an ATIP address to control an access; and a data transfer rate for monitoring a data capacity stored in an input data RAM and recording data on a disk by a data transfer rate. A buffer underrun judging means 19 for judging that a buffer underrun in which the transfer rate becomes slow and a state where the buffer underrun occurs is avoided, To control the recording of recorded data on the disc Recording start means 21 for detecting the head of an unrecorded area where no recording data is recorded on the disc and detecting the recording start position at which recording of the recording data is started by the recording control means 20 And the sub-code synchronization signal extracted by the decoder 4 and the sub-Q
A signal synchronizing means for synchronizing recording data to be newly recorded on the disk with the recording data already recorded on the disk.

Reference numeral 23 denotes an EFM output from the RF amplifier 2
A two-phase PLL (Phase) that selectively synchronizes a reproduced clock that reproduces data with a reference clock with crystal oscillation accuracy
This is a system clock generation circuit that generates an operation clock used for system control of the entire operation related to recording and reproduction of the disc by a LockLoop circuit.

The system clock generation circuit 22 includes a reproduction clock system for generating an operation clock using a reproduction clock obtained by reproducing a disk, and a reference clock system for generating an operation clock using a reference clock with crystal oscillation accuracy. The reproduction clock system operates selectively during the reproduction operation, and the reference clock system operates selectively during the recording operation.

In the thus configured disk recording device, an operation for recording data on the disk is performed by the personal computer 10, a command corresponding to the operation is generated, and the command is transmitted to the interface 8.
Is recognized by the system control circuit 17 via the CPU, the recording operation is executed.

When the recording operation is performed, the system clock generating circuit 23 is switched by the signal synchronizing means 22 so that the reference clock system operates, and enters a state of generating a reference clock. It is in a state of operating in synchronization with the clock.

The laser drive circuit 14 is controlled by a laser output setting circuit 15 so as to drive the optical head 1 with a laser output suitable for reproducing a disk. Reading of the groove signal is started.

The pre-groove signal read from the optical head 1 is shaped by the RF amplifier 2 and then the wobble component is extracted by the wobble decoder 6. The ATIP demodulation circuit 7 demodulates the ATIP from the wobble component. become.

Data output from the personal computer 10 to be recorded on the disk is supplied to the encoder 11 via the interface 8 and the encoder 1
1 modulates the recording data into a form to be recorded on the disk.

When the position traced by the laser beam of the optical head 1 reaches the write position on the disk, the recording data is sequentially output from the encoder 11 in EFM frame units, and an address indicating an address corresponding to the output recording data. The data is sequentially updated and stored in an address memory 24 provided in the system control circuit 17.

The laser output setting circuit 15 controls the laser drive circuit 14 by setting control data so that the laser output of the laser beam emitted from the optical head 1 is optimal for disk recording and disk reproduction.

Therefore, in this case, the optical head 1 is driven by the laser drive circuit 14 so as to emit a laser beam having an appropriate laser output to the disk to be recorded.

Then, the recording data output from the encoder 11 is supplied to the laser driving circuit 14, and the laser light source of the optical head 1 is driven by the laser driving circuit 14 based on the recording data. The recording data is recorded.

At the time of recording on the disk, the system clock generating circuit 23 generates a reference clock, and the recording data is recorded in synchronization with the reference clock.

By the way, the transfer speed of the data output from the personal computer 10 cannot keep up with the write speed of the record data recorded on the disk, and
When the data transfer rate input to the encoder 11 becomes lower than the data transfer rate output to the encoder 11, the data capacity stored in the RAM 12 decreases.

If this state continues, the amount of data stored in the RAM 12 will eventually become empty, and when this empty occurs, the buffer underrun determination means 19 will determine that the buffer underrun has occurred, and
A judgment output to that effect is generated.

Then, it is determined by the recording control means 20 that recording on the disk is to be interrupted, the output of recording data from the encoder 11 is interrupted, and the laser drive circuit 14 is controlled by the laser output setting circuit 15. Then, the emission of the laser beam used for recording from the optical head 1 is stopped, and the recording on the disk is interrupted.

Here, when the output of the recording data from the encoder 11 is interrupted, the address data corresponding to the address of the last frame of the recording data output from the encoder 11 immediately before the interruption of the recording is stored in the address memory 24.
And the stored address data is time information of the Q channel data (sub Q data) of the subcode and address information indicating the number of the EFM frame in the time information. Then, the signal synchronization means 22
Is that the address of the recording data of the last frame recorded on the disk by the address data stored in the address memory 24 is the time information in the sub-Q data at what time, what time, what frame, and what number of the EFM in the time information.
It manages whether it is a frame.

When the laser output setting circuit 15 controls the laser drive circuit 14 to stop the emission of the laser beam used for recording from the optical head 1, the laser drive circuit 14 controls the optical head 1 to perform reproduction from the optical head 1. The laser output setting circuit 15 controls the laser beam to be emitted.

The control data corresponding to the laser output of the laser beam at the time of recording immediately before the stop of the emission is stored in the laser output memory 16, and is stored even if the recording is interrupted.

When the next data is input from the personal computer 10, the access control means 18 converts the data recorded on the disk to the ATIP just before the interruption.
Access is made by the ATIP demodulated by the demodulation circuit 7 and the tracing by the optical head 1 is started.

At this time, the optical head 1 is driven by the laser drive circuit 14 under the control of the laser output setting circuit 15 so as to set a laser output suitable for disk reproduction. Is emitted.

When recording data is recorded at the start of tracing, pit signals formed on the disk are read simultaneously, and when EFM data can be obtained from the pit signals, the system clock generating circuit 23 is controlled by the signal synchronizing means 22. EFM from the state that generates the reference clock
The state is switched to a state in which a reproduction clock synchronized with the data is generated, and the circuits in FIG. 1 are operated in synchronization with the reproduction clock, and the modulation processing by the encoder 11 is also performed in synchronization with the reproduction clock. Become.

Here, the encoder 11 is provided with an internal RAM for performing a modulation process, and its internal RA
M is the CIR required for newly input data
When the recording of the recording data is interrupted in order to secure the interleave length of C (maximum of 108 EFM frames), data necessary for the CIRC processing is secured.

When the modulation process by the encoder 11 is performed in synchronization with the reproduction clock, the signal synchronization is performed using the sub-code synchronization signal extracted by the decoder 4 and the sub-Q data demodulated by the sub-code demodulation circuit 5. The recording data outputted from the encoder 11 is synchronized with the recording data already recorded on the disk by the means 22, and the encoder 11 refers to the address data stored in the address memory 24 and records by the recording control means 20. Immediately before the interruption, the apparatus enters a standby state for outputting the recording data of the frame next to the last frame recorded on the disk. When the encoder 11 is in the standby state, the recording start position detecting means 21 refers to the address data stored in the address memory 24 to determine the head position of the unrecorded area immediately after the recorded area in which the recorded data has already been recorded on the disk. Detection is performed.

The start position of the unrecorded area is detected based on the time information of the sub-Q data and the order of the EFM frame in the time information, and the sub-code frame (a set of 98 EFM frames) is detected. The unit is searched by the sub-Q data, and the EFM frame unit is determined by counting the channel bits based on the synchronization signal to determine the end of the last frame of the recording data recorded on the disc.

When the head position of the unrecorded area is detected, the system clock generating circuit 23
Is switched immediately from a state in which a reproduction clock synchronized with EFM data is generated to a state in which a reference clock is generated, and the reference clock becomes an operation clock of the encoder 11.

When the state is switched from the reproduction clock to the state in which the reference clock is generated, recording data is simultaneously output from the encoder 11 by the recording control means 20, and recording on the disk is restarted.

In this case, the recording data already recorded on the disc is synchronized with the recording data output from the encoder 11 by the signal synchronizing means 22, and the recording from the encoder 11 is performed immediately before the recording is interrupted. The recording data of the next frame recorded on the disk up to this point is output. Accordingly, new recording data is recorded from a position that seamlessly follows the last recording data recorded on the disk immediately before the recording is interrupted, and new recording data of a frame following the frame of the last recording data is recorded. Be recorded.

When the head position of the unrecorded area is detected, the laser output setting circuit 15 controls the laser drive circuit 14 using the control data stored in the laser output memory 16 as an initial value, and The disk recording is resumed by the laser beam having the same laser output as that immediately before the recording was interrupted.

Therefore, immediately after the recording of the disk is resumed, the recording data is recorded by a laser beam having a laser output suitable for recording on the disk.

In the above-described embodiment, the reference clock is generated as a system clock used at the time of the recording operation because the configuration is such that the rotation of the disk recorded by the constant linear velocity method is controlled by the method. However, in the case of controlling the rotation of a disk recorded with the constant linear velocity method using the constant angular velocity method, a clock synchronized with the wobble component extracted by the wobble decoder 6 is generated as a system clock used during the recording operation. Just do it.

[0051]

As described above, according to the present invention, when a recording start position at which recording is resumed is detected, a light beam having the same light output as that obtained immediately before recording is interrupted is obtained from the optical head. When the recording of the recording data is resumed immediately after the recording data recorded on the disk until immediately before the recording, the recording of the recording data can be performed by using a light beam having an optical output suitable for recording on the disk immediately after the resumption. I can do it.

The recording data to be newly recorded on the disk is synchronized with the recording data already recorded on the disk, and the recording is performed by detecting the head of an unrecorded area where no recording data is recorded on the disk. Is restarted, so that recording can be reliably restarted from the position following the last recorded data recorded on the disc seamlessly until immediately before the recording is interrupted, and the recorded data recorded continuously It is possible to record reproducible recording data on a disc even in an optical disc reproducing apparatus corresponding to only the disc.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an example of a CD-R drive as an embodiment of an optical disk recording device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical head 4 Decoder 5 Subcode demodulation circuit 6 Wobble decoder 8 Interface 11 Encoder 14 Laser drive circuit 15 Laser output setting circuit 16 Laser output memory 17 System control circuit 19 Buffer underrun determination means 20 Recording control means 21 Recording start position detection means 22 Signal synchronization means

Continued on the front page F term (reference) 5D044 AB01 BC04 CC04 DE42 GK12 5D090 AA01 BB03 BB04 CC01 CC05 CC09 CC16 DD03 DD05 EE02 FF34 GG26 GG29 HH01 KK03 5D119 AA23 BA01 BB02 BB03 DA03 DA13 EA07 HA17 HA36

Claims (2)

[Claims] An optical disk recording apparatus for recording input data on a disk using a light beam emitted from an optical head, comprising: a light source drive circuit for driving a light source of the optical head; and a light source drive circuit for controlling the light source drive circuit. An optical output setting circuit for setting the optical output of the optical head; storage means for storing data corresponding to the optical output of the optical head set by the optical output setting circuit; and interruption and recording of recording data on a disk Recording control means for controlling resumption, when the recording control means interrupts the recording of the recording data on the disk, the data according to the optical output of the optical head set by the optical output setting circuit, The data is stored in the storage means, and when the recording control means resumes the recording, the data stored in the storage means is read out and the light emission corresponding to the data is read out. An optical disc recording apparatus, wherein the optical output setting circuit is set so that a light beam of power is emitted from an optical head. 2. The recording control means according to claim 1, wherein the recording data to be newly recorded on the disk is synchronized with the recording data already recorded on the disk, and the head of an unrecorded area on which no recording data is recorded on the disk is added. 2. The optical disk recording apparatus according to claim 1, wherein the recording is restarted when detected.