Method and apparatus for detecting wobble defects in optical...

Details Method and apparatus for detecting wobble defects in optical... Method and apparatus for detecting wobble defects in optical...

2010-02-26

2011-12-06

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S053350, C369S059230

Reexamination Certificate

active

08072854

ABSTRACT:
Aspects of the disclosure provide an apparatus. The apparatus includes a pick-up unit, such as an optical pick-up unit, a wobble channel and a defect detector. The pick-up unit generates a push-pull signal corresponding to a wobbled track of a storage medium. The wobble channel includes circuits to receive the push-pull signal, obtain a wobble signal from the push-pull signal, and calculate a wobble amplitude metric based on the wobble signal. The defect detector compares the wobble amplitude metric to a threshold to detect wobble defects.

REFERENCES:
patent: 6683830 (2004-01-01), Eom
patent: 6894964 (2005-05-01), Park et al.
patent: 7483353 (2009-01-01), Mashimo
patent: 2005/0185549 (2005-08-01), Tsai et al.
patent: 2007/0076543 (2007-04-01), Tazaki
patent: 2009/0040888 (2009-02-01), Liow et al.

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