Servo error detector for optical disk

Details Servo error detector for optical disk Servo error detector for optical disk

2006-06-06

2006-06-06

Nguyen, Hoa T. (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044110

Reexamination Certificate

active

07057982

ABSTRACT:
A servo error detector usable in an optical disk system is provided. An envelope detecting unit (24) detects the top envelopes and bottom envelopes of RF signals SA–SH, and top envelope signals SAtop–SHtop and bottom envelope signals SAbtm–SHbtm that represent the top envelope waveforms and bottom envelope waveforms of RF signals output from an optical detector. An analog/digital conversion unit (26) converts analog top envelope signals SAtop–SHtop and bottom envelope signals SAbtm–SHbtm corresponding to all input RF signals SA–SH to digital top envelope signals QAtop–QHtop and bottom envelope signals QAbtm–QHbtm, respectively. A digital operation unit (28) performs digital operation treatment for digital top envelope signals QAtop–QHtop and bottom envelope signals QAbtm–QHbtm to generate various servo error signals.

REFERENCES:
patent: 4734799 (1988-03-01), Miyake
patent: 4998234 (1991-03-01), Rees et al.
patent: 5408452 (1995-04-01), Sakemoto et al.
patent: 6526006 (2003-02-01), Yoshimi et al.
patent: 2003/0007439 (2003-01-01), Brunheim et al.

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