Wobble detection circuit corresponding to a plurality of...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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Details

C369S044130, C369S044260, C369S044280, C369S124050, C369S124070, C369S124110, C369S275300

Reexamination Certificate

active

06888783

ABSTRACT:
A wobble detection circuit detects a signal by a common photodetector (light receiving) element from several kinds of media having different pre-formats. Further, the wobble detection circuit changes a gain for amplifying the signal in a wobble signal detection process depending on the pre-format of a reproducing or recording medium to obtain a wobble signal.

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