JP3459572B2 - Disk recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once disc recording apparatus, and record data additionally recorded when an address difference between an already recorded address recorded in advance on a blank disc and an address included in the record data occurs. The present invention relates to a disk recording device that performs additional recording so that the data can be reproduced without any trouble.

[0002]

2. Description of the Related Art There is known an optical disk recording apparatus for recording by changing the reflectance of a recording layer of an optical disk by irradiating a light beam from an optical head, and such an optical disk recording apparatus records once. The write once (writ once)
e-once) media as a CD (Compac
The CD-R (Recordable) drive of the t Disc) family is well known.

This CD-R drive is a pre-groove (Pre-groo) formed on a CD-R blank disc.
VE) has an ATIP (Absolute Time In Pre-gro) that is FM-modulated and recorded on a 22.05 kHz wobble.
The recording position is detected by referring to the recorded address called "ove)".

By the way, the writing speed of the CD-R drive has been increased, and recently, a CD-R drive capable of 8 times the standard speed has been commercialized.

When the writing speed is increased as described above, the acceleration / deceleration torque of the spindle motor is apt to be insufficient, and uneven rotation of the disk may occur.

When such rotation unevenness occurs, the synchronization deviation between the ATIP synchronization signal, which should originally be synchronized within a predetermined allowable range, and the subcode synchronization signal included in the CD-R recording data. Will occur.

[0007]

Since the additional recording in the CD-R is performed by referring to the ATIP address, the AT
When recording data is newly recorded after the recording data is recorded in the state where the synchronization signal between the IP synchronization signal and the subcode synchronization signal is generated, the end of the previously recorded recording data and a new recording are performed. A non-recorded area is formed between the recorded data and the start end of the recorded data, or new recording data is overwritten in the previously recorded recording data area.

That is, when the disc rotation speed is slower than that of ATIP, the subcode address recorded on the disc is delayed with respect to the ATIP address, and a non-recorded area is formed in the combined portion of record data by additional recording. On the other hand, when the disc rotation speed is high, the subcode address recorded on the disc advances with respect to the ATIP address, and overwriting of recorded data occurs.

A disc having a non-recorded area formed at a combined portion of recorded data by additional recording is not reproduced when it is reproduced by a disc reproducing device such as a CD-ROM drive which does not have a signal reading function of a pre-groove. There is a problem that the disk rotation control and the tracking control cannot be performed in the recording area, and the reproduction becomes impossible.

On the other hand, a disc on which recording data is overwritten has a problem that a part of the recording data is lost.

According to the present invention, even if additional recording is performed in a state where the synchronization signal between the ATIP synchronization signal and the subcode synchronization signal is generated, the recording position at which additional recording is started so that the above-mentioned problem does not occur. The purpose is to set correctly.

[0012]

According to the present invention, the address difference detecting means detects the address difference between the address data contained in the record data in the last recording area of the record data recorded previously and the recorded address, and the address difference detecting means detects the address difference. A correction address, which is obtained by correcting the address difference detected by the difference detection means, is generated by the recording position setting means, and the recording position at which additional recording is started is compensated with the already-recorded address corresponding to this correction address as a reference. Thus, the recording position at which the additional recording is started is compensated so that a non-recorded area is not formed in the combined portion of the recording data due to the additional recording and overwriting does not occur.

[0013]

1 is a circuit block diagram showing an example of a CD-R drive as an example of a 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 disc and writes and reads recorded data to and from the disc, and 2 is obtained by reading the recorded data on the disc by the optical head 1. An RF amplifier (3) that amplifies an RF signal (high frequency signal) and binarizes the RF signal and outputs it as digital data feeds back the output of the optical head (1) via the RF amplifier (2) and outputs a laser beam to a disc signal. The head servo circuit performs focusing control for focusing on the surface and tracking control for causing the laser beam to follow the signal track of the disk, and thread feeding control for sending the optical head 1 itself in the radial direction of the disk.

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

Reference numeral 6 is an encoder for adding the address data generated by the address generating circuit 7 to the input data, and modulating the input data added with the address data into recording data to be recorded on the disk. Reference numeral 8 is output from the encoder 6. 2 is a laser drive circuit that drives a laser light source that emits a laser beam of the optical head 1 based on recorded data.

Reference numeral 9 denotes an ATIP demodulation circuit 10 for extracting a wobble component from the disc pre-groove signal obtained via the RF amplifier 2 to generate a component necessary for controlling the rotation of the disc and demodulating ATIP from the wobble component. It is a wobble decoder provided.

Reference numeral 11 is a system control circuit for performing system control relating to recording and reproduction of the disc. The system control circuit 11 selects a subcode address of absolute time information in the subcode (Q code) demodulated by the subcode demodulation circuit 5 and an ATIP address of absolute time information in ATIP demodulated by the ATIP demodulation circuit 10. Access control means 12 for controlling access with reference to each other, the subcode address demodulated by the subcode demodulation circuit 5 and the ATIP address demodulated by the ATIP demodulation circuit 10 are compared to detect an address difference between them. An address difference detecting unit 13 and a recording position setting unit 14 for compensating the address difference detected by the address difference detecting unit 13 and setting a recording position for starting additional recording are provided.

In the disc recording apparatus having the above-described structure, when an instruction to execute additional recording is input, a PMA (Prog) provided on the inner peripheral side of the lead-in area of the disc is input.
The final recording area (final data) of the recording data previously recorded by the access control means 12 with reference to the subcode address demodulated by the subcode demodulation circuit 5 based on the address data indicating the final recording position recorded in the ramMemory Area). Block) is accessed.

When the last recording area of the previously recorded recording data is accessed, the recording data is reproduced, and the subcode address and ATIP address in the recording data of the same arbitrary subcode frame are set to the subcode demodulation circuit 5 and Obtained from the ATIP demodulation circuit 10. Then, the address difference between the subcode address and the ATIP address is detected by the address difference detecting means 13.

When the address difference detecting means 13 detects the address difference, the recording position setting means 14 corresponds to the recording position in order to compensate the recording position at which additional recording is started by the encoder 6 according to the address difference. ATI
Set the P address.

When the subcode address included in the record data is delayed with respect to the ATIP address in the last record area of the record data recorded last time, FIG.
As shown in FIG. 5, when the actual recording area where the recording data is actually recorded is shown by the solid line and the unrecorded area where the recording data is not recorded is shown by the broken line, the subcode address matches the ATIP address. In the ideal state where synchronization is achieved, the actual end position P1 where the final end of the actually recorded record data is located is located in front of the ideal end position I1 where the final end of the record data is originally located. Therefore, the address difference between the ATIP address and the subcode address appears as the difference between the ideal end position I1 and the actual end position P1.

In this case, the recording position setting means 14 uses the correction address obtained by subtracting the address difference detected by the address difference detection means 13 from the last recording address stored as the last recording position of the last recorded recording data. It is recognized as the final recording position of the recorded recording data, and the ATIP address corresponding to the corrected address is accessed by the access control means 12 to set the recording position for starting additional recording.

Therefore, the recording position at which the additional recording is started is compensated, and the additional recording is started substantially continuously to the last end of the previously recorded recording data.

Then, the recording position setting means 14 subtracts the address difference detected by the address difference detection means 13 from the ATIP address demodulated by the ATIP demodulation circuit 10 even after the additional recording is started to generate a corrected address.

Therefore, the ATIP address referred to by the recording data to be additionally written corresponds to the correction address generated by the recording position setting means 14, and corresponds to the address difference detected by the address difference detecting means 13. The ATIP address for a fixed value is continuously compensated until the recording by additional recording is completed.

Therefore, even if the subcode address included in the recording data is delayed with respect to the ATIP address, a non-recording area is not formed in the combined portion of the recording data by additional recording, so that the signal reading function of the pre-groove is provided. Even if the disc reproducing apparatus does not include the above, the combined portion of the recorded data can be reproduced without any problem.

On the other hand, when the subcode address included in the record data is advanced with respect to the ATIP address in the last record area of the record data recorded last time, as shown in FIG. When the actual recording area where the recording data is recorded is shown by the solid line and the unrecorded area where the recording data is not recorded is shown by the broken line,
In the ideal state where the subcode address matches the ATIP address and synchronization is achieved, the ideal end position I2 where the final end of the recorded data should originally be located is actually ended where the final end of the recorded data is located. The position P2 is exceeded, and the address difference between the ATIP address and the subcode address appears as the difference between the ideal end position I2 and the actual end position P2.

In this case, the recording position setting means 14 adds a correction address obtained by adding the address difference detected by the address difference detection means 13 from the last recording address stored as the last recording position of the recording data D recorded last time. The recording position at which additional recording is started is set by recognizing the ATIP address corresponding to the corrected address as the final recording position of the recording data recorded last time.

Therefore, the recording position at which the additional recording is started is compensated, and the additional recording is started substantially continuously to the last end of the previously recorded recording data.

Then, the recording position setting means 14 adds the address difference detected by the address difference detection means 13 from the ATIP address demodulated by the ATIP demodulation circuit 10 even after the additional recording is started to generate a correction address.

Therefore, the ATIP address referred to by the recording data to be additionally written corresponds to the correction address generated by the recording position setting means 14, and is constant according to the address difference detected by the address difference detecting means 13. The compensation of the ATIP address for the value is continuously performed until the writing by the additional recording is completed.

Therefore, even if the subcode address included in the recording data advances with respect to the ATIP address, overwriting is not generated in the combined portion of the recording data by the additional recording, so that the recording data previously recorded by the additional recording is not generated. The recorded data in the final recording area of is not damaged.

By the way, when such additional recording is performed, the address generated by the address generation circuit 7 is an address continuous with the final subcode address included in the recording data recorded last time, The address difference detected by the difference detecting means 13 is not compensated. Therefore, when the recorded data on the disc is played back, consecutive subcode addresses are demodulated,
Even a disc reproducing apparatus having a function of detecting an interruption in the continuity of the subcode addresses and detecting an abnormality in disc reproduction can reproduce a disc on which recorded data is additionally recorded without any problem. .

In the embodiment of FIG. 1, the access to the final recording area of the previously recorded recording data, which is performed to detect the address difference by the address difference detecting means 13, is performed.
Although it is performed by referring to the subcode address, in the case of a disc on which recording data including a header indicating the address of a sector is recorded, even if the header is referred to, the last recording area of the recording data recorded last time is recorded. You can access it.

[0036]

As described above, according to the present invention, the address difference between the address data included in the recorded data in the last recorded portion recorded last time and the recorded address is detected by the address difference detection means, and the address difference is detected according to the address difference. Since the recording position at which the additional recording is started is compensated, it is possible to prevent the non-recorded area from being formed in the combined portion of the recording data by the additional recording and the occurrence of the overwriting.

In this case, the recording position for starting the additional recording is set with reference to the already recorded address corresponding to the corrected address obtained by correcting the address difference detected by the address difference detecting means, and the recording position for starting the additional recording is compensated. Even if this happens, there is no need to change the address included in the recorded data, so
It is possible to secure the continuity of the addresses included in the recorded data at the combined portion by the additional recording, and it is possible to reproduce the combined portion by the additional recording in the disc reproducing device without any problem.

Further, when the recording position for starting the additional recording is compensated, the recording by the additional recording is completed by compensating for the fixed value of the recorded address corresponding to the address difference detected by the address difference detecting means. The recorded data recorded by one-time additional recording has a one-to-one correspondence between the already recorded address and the address included in the recorded data, which simplifies the management of the recorded data. You can do it.

Further, when the additional recording is executed, the access control means refers to the address included in the record data to access the address indicating the final recording position of the record data recorded previously, and the access is performed. Since the address difference between the address in the recorded data and the already recorded address is detected, the last recorded area of the previously recorded recorded data can be surely and quickly accessed.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram illustrating a recording state when a subcode address included in recording data is behind an ATIP address.

FIG. 3 is an explanatory diagram illustrating a recording state when a subcode address included in recording data is ahead of an ATIP address.

[Explanation of symbols]

1 Optical head 4 decoder 5 Subcode demodulation circuit 6 encoder 10 ATIP demodulation circuit 12 Access control means 13 Address difference detection means 14 Recording position setting means

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Claims (3)

(57) [Claims] 1. A write-once disc recording apparatus for detecting a recording position by referring to an already-recorded address recorded in advance on a blank disc and writing record data including the address, which has been previously recorded. recording for generating a correction address correction and address difference detection means for detecting the address difference between the address and the already-recorded address included in the recording data in the last recorded area of the recording data, the detected address difference by said address difference detection means position
And a recording means corresponding to the correction address
A disk recording device characterized in that a recording position at which additional recording is started is compensated on the basis of an address . 2. When the recording position for starting the additional recording is compensated, the recording by the additional recording is completed by compensating for a fixed value of the recorded address corresponding to the address difference detected by the address difference detecting means. The disk recording apparatus according to claim 1 , wherein the disk recording apparatus is continuously performed until it reaches the end. 3. When the additional recording is executed, the access control means refers to the address included in the recording data to access the address indicating the final recording position of the recording data recorded last time, and the access is performed. 2. The disk recording apparatus according to claim 1, wherein an address difference between an address in recorded data and an already recorded address is detected.