Radio frequency zero crossing signal generator for optical...

Details Radio frequency zero crossing signal generator for optical... Radio frequency zero crossing signal generator for optical...

2011-03-15

2011-03-15

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S030460, C369S030470, C369S030580, C369S030590, C369S030730, C369S030740, C369S030880, C369S030890, C369S215100, C369S219100

Reexamination Certificate

active

07907500

ABSTRACT:
The invention discloses radio frequency zero crossing signal generators for optical disc drives, comprising a controllable low pass filter, a comparator, and a control circuit. The controllable low pass filter evaluates an average level of the magnitude of a radio frequency ripple from an optical disc drive. The comparator compares the radio frequency ripple to the average level evaluated by the controllable low pass filter to generate a radio frequency zero crossing signal. When the optical disc drive reads a fingerprint defect on an optical disc, the control circuit adjusts a cut-off frequency of the controllable low pass filter to adjust the speed at which the controllable low pass filter evaluates the average level.

REFERENCES:
patent: 6051997 (2000-04-01), Yeung et al.
patent: 2002/0064009 (2002-05-01), Andoh
patent: 2002/0118235 (2002-08-01), Narazaki et al.
patent: 2002/0181374 (2002-12-01), Lai
patent: I258738 (2006-07-01), None

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