Demodulation circuit for demodulating wobbling signal

Details Demodulation circuit for demodulating wobbling signal Demodulation circuit for demodulating wobbling signal

2007-03-13

2007-03-13

Edun, Muhammad (Department: 2656)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047190, C369S059100, C369S059200

Reissue Patent

active

10640282

ABSTRACT:
A device for demodulating position information that is recorded as track wobbling in a record medium by a BPSK scheme includes a carrier-wave-generation circuit which derives a carrier wave from a wobbling signal obtained from the record medium, a phase-adjustment circuit which generates a phase-comparison signal having a 90° phase difference relative to the carrier wave, a multiplier which multiplies the wobbling signal and the phase-comparison signal to supply a product signal, and a detection circuit which detects a phase error of the carrier wave introduced by the carrier-wave-generation circuit by detecting the phase error between the wobbling signal and the phase-comparison signal based on the product signal.

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