JP2002279641A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of no increases in a PMA reading success rate by retrial when an RF signal read from a disk does not become an effective binary value because of semiconductor variance even if it is binarized by a binarization circuit. SOLUTION: This device is provided with a slice level setting circuit 5 for setting a slice level when binarization is carried out by a binarization circuit 4, and a track information reading determination means 8 for detecting the reading error of a track information storage area to determine whether the reading of this track information storage area is normal or not. When the track information reading determination means 8 determines that the reading of the track information storage area is not normal, a retrial operation is carried out to read the track information storage area again and, during this retrial operation, the slice level in the binarization by the binarization circuit 4 is changed by the slice level setting circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily recording track information relating to recording data recorded in a program area in a track information storage area until the recording area of the recording data is closed. The present invention relates to a disc recording apparatus in which track information recorded in a track information storage area is recorded as TOC data in a lead-in area.

[0002]

2. Description of the Related Art There is known an optical disk recording apparatus which performs recording by changing the reflectance of a recording layer of an optical disk by irradiating a light beam from an optical head. So-called write-once (writ) that cannot physically erase erased data
e-once) CD (Compac)
CD-R (Recordable) drive devices of the (t Disc) family are well known.

The recording format of a CD-R includes a PMA (Program Memory A) toward the inner circumference of a program area for recording actual recording data on a disk.
rea) and a data structure in which a PCA (Power Calibration Area) is sequentially formed.

The PMA is a track information storage area for temporarily recording track information relating to recording data recorded in a program area until a recording area (for example, a session) of the recording data is closed. Is a test writing area for setting the optimum recording level of the light emission output emitted from the optical head during recording.

In the CD-R drive device, lead-in and lead-out are formed before and after a recording area of recording data recorded on a disc, and a closing process is performed. At the time of the closing process, the data is recorded in the PMA. Based on the track information, TOC (Table
Of Contents) data is recorded.

That is, if the PMA is not read normally, TOC data cannot be recorded, and the recording area of the corresponding recording data is not closed, so that there is a problem that the recording data of the recording area cannot be reproduced.

[0007] Therefore, PMA has five frames of the same content.
Times, and many CD-R drive devices
Even if the PMA cannot be read normally in all the frames, the reading of the PMA is retried.

[0008]

However, even if an RF signal read from a disk is binarized by a binarization circuit, there is a case where a valid binary signal is not obtained due to a variation in semiconductors.

In such a case, the result is the same even if the reading of the PMA is retried, so that the success rate of the reading of the PMA by the retry is not improved at all.

[0010]

According to the present invention, a slice level setting circuit for setting a slice level for binarization by a binarization circuit, and a track information storage area detected by detecting a read error of a track information storage area. A retry operation for determining whether the reading of the area is normal or not, and for rereading the track information storage area when the reading of the track information storage area is not normal by the track information reading determining means. In addition, when performing this retry operation, the slice level setting circuit changes the slice level at the time of binarization by the binarization circuit.

[0011]

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

In FIG. 1, reference numeral 1 denotes an optical head which emits a laser beam for tracing a signal track of a disk, and writes and reads recording data on and from a disk, and 2 denotes a focus control of the laser beam from the optical head 1. And a head servo circuit for performing tracking control.

Reference numeral 3 denotes an RF amplifier for amplifying the RF signal (radio frequency signal) of the received light output obtained by the optical head 1, reference numeral 4 denotes a binarization circuit for binarizing the RF signal, and reference numeral 5 denotes the binarization circuit. 4 is a slice level setting circuit for setting a slice level for binarization by 4; The slice level setting circuit 5 sets a slice level corresponding to the speed at the time of speed switching in high-speed recording and reproduction when the disk rotation speed is higher than the rated speed.

Reference numeral 6 denotes a decoder for decoding a binary signal output from the binarizing circuit 4 in accordance with a data structure defined in the CD system. The decoder 6 is provided with a subcode decoding circuit 7 for decoding a subcode.

Reference numeral 8 denotes a subcode decoding circuit 7 when reading the PMA which is a track information storage area of the disk.
, A CRC (Cyclic Redundancy Code) error signal, which is generated from the PMA, detects a PMA read error, and determines whether or not the read of the PMA is normal. If the PMA reading is not normal due to
Retry control means for rereading the MA.

Next, the operation of reading the PMA in the disk recording / reproducing apparatus thus configured will be described.

When reading the PMA, the optical head 1 accesses the PMA area of the disk and performs the PMA reproduction.

The PMA RF signal read by the optical head 1 is amplified by the RF amplifier 3 and binarized by the binarization circuit 4 to become a binary signal. The binary signal is decoded by the decoder 6 and the extracted subcode is decoded by the subcode decoding circuit 7.

The PMA data thus decoded is stored in the memory 10 so as to be used at the time of the closing process.

When the PMA cannot be read normally and a CRC error signal is generated from the subcode decoding circuit 7, the track information reading determining means 8 determines that the reading of the PMA is not performed normally, and P
Without storing the MA data in the memory 10, the PM
Attempt to read A.

If the reading of the PMA for all five frames has failed, the retry control means 9 controls the PMA to be read again.

The slice level setting circuit 5
The slice level at the time of binarization by the value conversion circuit 4 is changed by one stage.

In this way, the slice level at the time of binarization by the binarization circuit 4 is changed by one stage, and the reading of the PMA is retried. If the reading of the PMA fails even in this retry, the slice level is further changed and the reading of the PMA is retried.

The slice level set by the slice level setting circuit 5 can be changed by one or two steps to different polarities around the standard level.

When the reading of the PMA fails in this way, the slice level is changed by the slice level setting circuit 5 and the reading of the PMA is repeated.

Therefore, if the reading of the PMA fails without being a valid binary signal even if it is binarized by the binarization circuit 4, it becomes a valid binary signal upon retry and becomes a PM signal.
The likelihood of a successful read of A is significantly increased.

The reading of the PMA ends when the reading of the PMA is normally performed and the PMA data is stored in the memory 10, or when the number of retries reaches a preset number of times, the reading of the PMA is stopped. Exit regardless of success or failure.

In the above embodiment, the slice level by the binarizing circuit 4 is changed from the first retry operation for rereading the PMA.
The slice level may be changed after performing the retry operation two or three times at the standard slice level.

[0029]

As described above, according to the present invention, when the reading of the data in the track information storage area fails even if the binarization circuit does not convert the data into a valid binary signal, the data is read. The likelihood of success is significantly increased.

Further, a slice level setting circuit for setting a slice level at the time of speed switching in high-speed recording / reproducing when the disk rotation speed is higher than the rated value sets the slice level at the time of retry of reading the track information storage area data. Therefore, there is no need to newly provide a slice level setting circuit, and the change and increase in the circuit configuration can be achieved.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical head 4 Binarization circuit 5 Slice level setting circuit 6 Decoder 8 Track information reading judgment means 9 Retry control means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G11B 20/18 572 G11B 20/18 572F 574 574F (72) Inventor Kazuya Kogure Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. F term (reference) 5D044 BC02 CC04 DE70 FG06 FG18 5D090 AA01 BB04 CC04 DD03 DD05 EE11 EE14 FF43 HH01

Claims (2)

[Claims] 1. Track information relating to recording data recorded in a program area is temporarily recorded in a track information storage area, and when closing a recording area of recording data, the track information recorded in the track information storage area is recorded. Generates TOC data based on
A disc recording / reproducing apparatus for recording data in a lead-in area, comprising: a binarization circuit for binarizing a read signal read from a disc; and a slice level for binarization by the binarization circuit. A slice level setting circuit to be set, and track information read determining means for detecting a read error of the track information storage area and determining whether or not reading of the track information storage area is normal. When the reading of the track information storage area is not normal, the retry operation for rereading the track information storage area is performed. A disk recording / reproducing apparatus for changing a slice level of a disk. 2. The slice level setting circuit according to claim 1, wherein the slice level setting circuit is used for setting a slice level at the time of speed switching in high-speed recording / reproduction when the disk rotation speed is higher than a rated speed. Disk recording device.