Laser noise cancel circuit and optical disk device

Details Laser noise cancel circuit and optical disk device Laser noise cancel circuit and optical disk device

2006-12-12

2006-12-12

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular component circuitry

Having noise suppression circuitry

C372S038010

Reexamination Certificate

active

07149232

ABSTRACT:
Disclosed herein is a laser noise cancel circuit for reducing laser noises in a reproduction system for an optical disk device including, a gain-variable amplifying noise cancel circuit for amplifying a monitor output signal for laser light, a first low-pass filter for extracting low frequency signal components of a monitor output signal for noise canceling, a second low-pass filter for extracting low frequency signal components, a negative return loop circuit for controlling a gain in the amplifying noise cancel circuit based on the low frequency signal components of the monitor output signal for noise canceling extracted as well as on the low frequency signal components of the reproduced high frequency signal extracted, to determine the low frequency signal component rate of the monitor output signal for noise canceling as identical to the low frequency signal component rate of the reproduced high frequency signal, and an arithmetic circuit for generating the reproduced high frequency signal with the laser noise components cancelled by canceling the laser noise components extracted from the monitor output signal for noise canceling with a low frequency signal component rate determined as identical to the low frequency signal component rate of the reproduced high frequency signal with the laser noise components of the reproduced high frequency signal.

REFERENCES:
patent: 4691308 (1987-09-01), Takagi et al.
patent: 5491682 (1996-02-01), Dohmeier et al.
patent: 5684769 (1997-11-01), Kaneko
patent: 6026071 (2000-02-01), Kimura
patent: 2002/0085468 (2002-07-01), Kobayashi
patent: 10-124919 (1998-05-01), None
Shu-Chuan Huang and Mohammed Ismail, “Novel Fully-Integrated Active Filters Using the CMOS Differential Difference Amplifier” IEEE, Aug. 14, 1989, pp. 173-176.

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