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
CN1365105AInactive Publication Date: 2002-08-21SONY CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SONY CORP
Publication Date
2002-08-21
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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