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Optic disc replaying device, optic disc recording and replaying device and laser noise clearing circuit

A replay device, optical disc recording technology, applied in optical recording/reproduction, optical recording/reproduction/erasing method, optical recording head, etc., capable of solving problems such as difficult handling of AGC circuits

Inactive Publication Date: 2002-08-21
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Therefore, this conventional method for eliminating laser noise requires an AGC (Automatic Gain Control) circuit, and it is difficult for this AGC circuit to perform correct processing because of the aforementioned various laser noise variation factors needing to be considered

Method used

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  • Optic disc replaying device, optic disc recording and replaying device and laser noise clearing circuit
  • Optic disc replaying device, optic disc recording and replaying device and laser noise clearing circuit
  • Optic disc replaying device, optic disc recording and replaying device and laser noise clearing circuit

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Embodiment Construction

[0044] Embodiments of an optical disk reproducing apparatus, an optical disk recording and reproducing apparatus, and a laser noise canceling circuit according to the present invention will be described below with reference to the accompanying drawings. The following description takes an example in which an optical disc reproducing apparatus, an optical disc recording and reproducing apparatus and a laser noise canceling circuit are applied to, for example, an optical disc reproducing apparatus or an optical disc recording and reproducing apparatus employing a DVD as a recording medium according to the present invention. Condition.

[0045] FIG. 1 is a schematic diagram for explaining an optical disk reproducing apparatus (hereinafter simply referred to as an optical disk apparatus) according to this embodiment. In FIG. 1, an optical disc 100 is, for example, a DVD on which software such as movies is recorded. As various optical disc devices, the optical disc device according...

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PUM

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Abstract

A first multiplier 251 multiplies a reproduced RF signal rf(t) by a DC component of an APC monitoring output signal m(t), which component is an output signal from an LPF 252, and then supplies a signal resulting from the multiplication to an arithmetic unit 255. A second multiplier 254 multiplies the reproduced RF signal rf(t) by a laser noise component of the APC monitoring output signal m(t), which component is an output signal from an HPF 253, and then supplies a signal resulting from the multiplication to the arithmetic unit 255. The arithmetic unit 255 subtracts the signal from the multiplier 254 from the signal from the multiplier 251 to thereby remove both an additive noise component and a modulated noise component of laser noise.

Description

technical field [0001] The present invention relates to a laser noise canceling circuit in an optical disc device using various optical discs such as DVD (Digital Versatile Disc) and CD (Compact Disc) as recording media. Background technique [0002] Playback devices and recording and playback devices using optical discs as recording media are widely used. For example, DVD players and CD players are widely used in ordinary households. For example, it is possible to record on DVD-R (DVD Recordable), DVD-RW (DVD Rewritable), CD-R (CD Recordable), CD-RW (CD Rewritable), etc. The optical disc recording and playback device is widely used as a data recording device for personal computers. [0003] In such an optical disc device as an optical disc playback device or an optical disc recording and playback device, a reproduced radio-frequency signal (reproduced radio frequency signal) obtained from the optical disc includes laser noise caused by laser light ...

Claims

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Application Information

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IPC IPC(8): G11B7/004G11B7/005G11B7/125G11B7/126G11B7/135G11B20/10G11B20/24
CPCG11B7/126G11B7/005G11B20/24G11B7/0943G11B20/10009G11B20/10101G11B7/004
Inventor 小林伸嘉
Owner SONY CORP
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