Detector for detecting information carried by a signal...

Details Detector for detecting information carried by a signal... Detector for detecting information carried by a signal...

2004-10-06

2008-08-26

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S047310

Reexamination Certificate

active

07417926

ABSTRACT:
A detector for detecting information carried by a wobble signal having a sawtooth-like shape with a base frequency of fwob. The detector includes a first band-pass filter having a center frequency close to 2*fwobfor filtering the wobble signal and generating a first filtered signal, a second band-pass filter having the center frequency close to fwobfor filtering the wobble signal and generating a second filtered signal, first and second comparators for respectively comparing the first and second filtered signal with a reference voltage and generating first and second compared signals, a delay unit for delaying the second compared signal by a time period, and then outputting a delayed signal, and a sampling unit for sampling the first compared signal using the delayed signal as a sampling clock, and for outputting a sampled value representing the information carried by the sawtooth wobble.

REFERENCES:
patent: 6608810 (2003-08-01), Minamino et al.
patent: 6765959 (2004-07-01), Tanaka et al.
patent: 2005/0050406 (2005-03-01), Hsu

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