Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

2006-07-25

2009-10-06

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S124040

Reexamination Certificate

active

07599262

ABSTRACT:
To detect an MSK modulation mark from an MSK-modulated wobble signal without fail. A wobble signal of an optical disk is supplied to an address decoding circuit. The address decoding circuit performs exclusive-OR operation of a binarized wobble signal and a reference clock signal generated from the wobble signal by an PLL circuit, to thus compute a proportion of the exclusive-OR result assuming a value of one every half period of a reference clock signal. When there are continuously present a predetermined number of sections or more where a proportion becomes a predetermined threshold proportion or more, the sections are detected as an MSK modulation mark. A system controller changes the threshold proportion in accordance with crosstalk from an adjacent track.

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Notice of Grounds for Rejection (JP) dated Mar. 18, 2008, issued in corresponding Japanese Application No. 2005-215279.

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