JPS62141679A - Light disk processor - Google Patents

Abstract

PURPOSE:To execute reproduction or flag detection even when sector pulse is abnormal by writing bit of bytes having a fixed allowance in an area of flag that indicates abnormality of sector pulse. CONSTITUTION:Sector address of data is set to a comparator circuit 4 and data are written from circuits 2, 3, 5 when the address coincide with sector address from the device. At this time, if a sector pulse abnormality signal 106 is outputted from a sector pulse abnormality detecting circuit 9, a flag 3 is written taking variation of rotation speed into consideration and at redundancy that exceeds error rate of a medium. Further, data same with the data are written in a substitute sector. When reproducing data, if addresses of sectors coincide, and the flag 3 is sensed, data of the sector are not reproduced, and data are read from the substitute sector. Thus, data writing is continued even if the medium is defective, and data can be reproduced correctly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an original disk processing device, and more particularly to a device that performs error handling when there is a defect on the medium and correct positioning cannot be performed.

[Conventional technology]

Conventionally, this type of optical disk processing device writes data to each sector based on the marker generated for each glyph-formatted sector on the medium. Even if the sector marker was abnormal, interpolation was performed using a counter or the like so that the abnormality was not visible.

[Problem that the invention seeks to solve]

The above-described conventional original disk processing apparatus has a drawback that when the rotational speed P of the disk changes, the position of the interpolated sector pulse shifts, making it impossible to accurately position the sector. Therefore, after writing flags and data based on this sector pulse, even if you try to detect the flag or reproduce the data at another cycle, the position of the sector has shifted, making it impossible to reproduce or detect the flag. There was a problem.

The present invention provides a source disk processing device that can perform regeneration or flag detection even if the sector pulse is abnormal.

[Means for solving problems]

The present invention relates to a circuit for writing data to an irreversible medium recorded by changing the characteristics of the medium or removing a portion of the medium by an optical method, a circuit for detecting a sector pulse generated for each sector, and a circuit for detecting a sector pulse generated for each sector. This is a former disk processing device characterized by having a circuit for detecting whether an address is valid, a detection circuit for detecting an abnormality in a sector pulse, and a circuit for writing a sector pulse abnormality flag.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a diagram showing the format of sectors written according to the present invention. FIG. 3 is a time chart showing the operation of the embodiment of the present invention.

FIG. 4 shows the processing flow. In FIG. 2, the addresses are formatted f IJ on the media.

Flag 1 is a flag indicating that a verify operation has been performed after writing data, and can also be used to indicate that data has been written.

Flag 2 indicates that the data is unnecessary. Flag 3 is a flag written when the sector pulse is abnormal, and flag 3 writes bits of the number of bytes that have redundancy exceeding the error rate of the medium and take into account rotational fluctuations of the original disk in the flag area.

In Figure 1, 1 is a microprocessor, and the microprocessor 1 has a function of setting each flag and data write enable, a function of sensing an abnormality in the sector, and a function of setting a sector address for comparison. has.

2 is a data transfer control circuit, and 3 is an FCC generation circuit.

4 is a comparison circuit, and comparison circuit 4 compares the sector address set by the microprocessor with the sector address read from the original disk.

5 is a modulation circuit, 6 is a flag 1 write circuit, 7 is a flag 2 write circuit, and 8 is a flag 3 write circuit. 9 is a sector pulse abnormality detection circuit, and the detection circuit 9 outputs a sector pulse abnormality detection when a sector pulse is detected when the sector address is not enabled. Reference numeral 10 denotes a control circuit for starting writing based on the sector pulse.

11 is a selection circuit, 12 is a sector address enable detection circuit, 13 is a sector pulse detection circuit, and 14 is a circuit that latches the sector address and increments it for each sector pulse. 15 is a flag detection circuit.

In FIG. 3, signal 101 indicates sector /'? signal 101 is a pulse detection signal, even if the physical sector address is bad,
Generates even if the sector address cannot be reproduced. 102
, 103 and 104 are flags 1., 103 and 104, respectively, created based on the sector pulse 101. Flag 2. This is a data writing start signal. Reference numeral 105 is a signal indicating that the sector address is valid; LOW indicates validity, and HIGH indicates that the sector address is invalid, as shown by the dotted line in FIG.

Signal 106 indicates that 105 is high when 101 is occurring.
This signal is sent when the signal is IGH and indicates that the sector address is abnormal. Signal 107 is flag 3
201 is the write data of the E turn of flag 3.

In the embodiment, the processing when data is written in the circuit shown in FIG. 1 and an abnormality occurs in the sector pulse and the processing when reproducing the data will be described.

During the scraping process, as shown in Figures 1 and 4 (a),
As part of the data write process, the microprocessor 1 sets the data sector address in the comparator circuit 4, and when it matches the sector address from the device, the data write signal becomes valid, and the signal 102 is activated by the signal from the sector pulse detection circuit. The data is written from circuit 2.3.5. At this time, when the sector address enable signal 105 is HIGH, the sector pulse abnormality detection circuit 9 turns on the sector pulse abnormality detection 106, allowing the microprocessor 1 to sense it.

After the microprocessor 1 senses the signal 106, it writes a flag 3 indicating that the sector pulse is abnormal, and writes the same data to the alternative sector.

When reproducing data, as shown in Figures 1 and 4 (b), if the addresses of each sector match and flag 3 is sensed, the data in that sector is not reproduced and data is read from an alternative sector. put out.

〔Effect of the invention〕

As explained above, the present invention takes into account fluctuations in rotational speed and writes bits of the number of bytes with redundancy exceeding the error rate of the medium, and when the sector pulse is abnormal, an alternative sector is written. If you write data in advance, even if the sector pulse is abnormal due to a defect in the medium, data writing will continue without stopping processing, and the data will be reproduced correctly during playback. It has the effect of eliminating the impossibility.

[Brief explanation of drawings]

Figure 1 shows one embodiment of the present invention;
The figure shows the sector format used by the present invention. 1...Microprocessor, 6,7.8...Flag writing circuit, 9...Sector pulse abnormality detection circuit, 1
2... Sector address enable detection circuit, 13...
・Sectanosol detection circuit.

Claims (1)

[Claims] (1) A circuit for writing data to an irreversible medium that is recorded by changing the characteristics of the medium or removing a portion of the medium by an optical method, a detection circuit for sector pulses generated for each sector, and a sector pulse detection circuit for each sector. An optical disc processing device comprising: a circuit for detecting whether an address is valid; a detection circuit for detecting an abnormality in a sector pulse; and a circuit for writing a sector pulse abnormality flag.