Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2007-10-09
2007-10-09
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
Reexamination Certificate
active
10899127
ABSTRACT:
A wobble signal detecting circuit for an optical disk reproducing device configured to reproduce an optical disk which has a track including a snaking portion at a specific period, including an optical detecting unit which detects a signal written on the track, first and second band-pass filters which have different pass bandwidths and extract respectively a first and second wobble frequency components of the snaking portion based on outputs from the optical detecting unit, and a wobble signal determining unit determines that a wobble signal is present if a frequency difference or a frequency ratio of the first and second wobble frequency components is equal to or less than a prescribed value. Preferably, a higher frequency side shoulder of a bandwidth of the first band-pass filter and a lower frequency side shoulder of a bandwidth of the second band-pass filter are located on a wobble frequency.
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Funai Electric Co. Ltd.
Hindi Nabil
Morgan & Lewis & Bockius, LLP
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