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Light disk signal processing method and light disk device

A signal processing and signal technology, applied in the direction of recording signal processing, optical disc, optical recording/reproduction, etc., can solve the problems of high power consumption and high cost

Inactive Publication Date: 2003-07-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacture of multi-bit high-speed A / D converters requires a special process, which has the problems of high cost and high power consumption

Method used

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  • Light disk signal processing method and light disk device
  • Light disk signal processing method and light disk device
  • Light disk signal processing method and light disk device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The optical disc device of Embodiment 1 of the present invention is shown in figure 1 , and its signal waveform is shown in image 3 .

[0022] figure 1 Among them, the light detection unit 4 is composed of an optical disc 1 , a motor 2 for rotating the optical disc 1 , and a detector (optical head) 3 for reading a signal from the optical disc 1 . Optical disc 1 is a rewritable optical disc with a land groove recording method with a phase change film. A pre-pit is engraved on the sector header, and an ID signal is arranged at the junction of the land and the groove. The latter have recorded signals as crystalline and amorphous marks. The optical head 3 irradiates the laser spot for focusing and tracking control on the flat land or groove of the optical disc 1, and the reflected light of the optical disc is received by a plurality of PIN diodes, converted into electrical signals and output. The differential amplifier 6 takes as its input the tracking signal 5 among t...

Embodiment 2

[0063] First, the optical disc device of the second embodiment in which the ID signal is selected from the difference signal will be described. The signal waveform diagram is shown in Figure 5 .

[0064] The description of the same configuration of the second embodiment as that of the first embodiment will be omitted, and only the differences between the two will be described. figure 2 in addition with figure 1 Frames with the same numbers have the same functions as those in Embodiment 1.

[0065] figure 2 Among them, the light detection unit 4 converts the signal recorded on the optical disc into a plurality of electrical signals for output. A difference signal 7 is generated by a differential amplifier 6 . Such as Figure 5 As shown in (c), the difference signal 7 is preceded by an ID signal and followed by a wobble signal of a single frequency. The ID signal is composed of two parts with different polarities, and the figure shows the situation opposite to that of E...

Embodiment 3

[0085] The optical disc device of Embodiment 3 of the present invention is shown in Figure 6 , and its signal waveform is shown in Figure 8 .

[0086] The description of the same parts of the third embodiment and the second embodiment is omitted, and only the different parts are described. Figure 6 in addition with figure 2 Blocks with the same numbers have the same functions as in Embodiment 2.

[0087] Figure 6 Among them, the light detection unit 4 converts the signal recorded on the optical disc into a plurality of electrical signals for output. Here, the detection method of the tracking signal 5 will be described.

[0088] Such as Figure 7 As shown, the optical head 3 uses a split detector 94 composed of detectors 3a to 3d arranged close to each other, and a receiving beam 95 is arranged at the junction thereof. The detection signals of the four detectors are output as t1-t4 signals.

[0089] Figure 6 Among them, the signal added by t1 and t4 is the tracki...

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Abstract

A method and a device of processing a signal to solve the problem that a multi-bit and high-speed A / D converter for converting an analog regenerated signal into a digital signal on an optical disk is costly. In the method of processing a signal using a sum signal (22) or a difference signal (7) of a plurality of electric signals detected by an optical detection unit (4), an ID signal and a recording signal contained in the sum signal or the difference signal are selected and time-multiplexed, the polarity of the ID signal is adjusted to the polarity of the recording signal, the DC levels of the polarity-adjusted ID signal and recording signal are controlled and maintained at a constant level, and a series of the polarity and DC-level-adjusted signals are A / D converted. Thus, the dynamic range of the multiplexed signal is reduced, and both the sum and the difference signals are digitized by a single A / D converter having the minimum number of bits.

Description

technical field [0001] The present invention relates to an optical disc signal processing method and an optical disc device for reproducing a rewritable optical disc. Background technique [0002] Rewritable optical discs are being developed and commercialized as external storage devices for computers and AV discs for video and audio because they can record and reproduce high-density information. It is known that in a high-density rewritable optical disc, a groove (guide groove) and a land (land) (between grooves) are provided for beam tracking control, and a land groove in which reproduced information is recorded in both the land and the groove is used. Internal recording technology. [0003] In the optical disc, the recording track is divided according to each predetermined amount of information, which is called a sector as a recording unit. Usually, in the header of each sector, an ID signal pre-recording the sector address and various attributes is set. Aspect method ...

Claims

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Application Information

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IPC IPC(8): G11B7/0037G11B7/005G11B7/007G11B20/10
CPCG11B7/00718G11B20/10G11B7/0037G11B7/005G11B20/10037G11B2220/2537
Inventor 古宫成久门裕二
Owner PANASONIC CORP
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