Device and method for detecting defect signals on an optical...

Details Device and method for detecting defect signals on an optical... Device and method for detecting defect signals on an optical...

2011-06-07

2011-06-07

Hindi, Nabil Z (Department: 2627)

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Reexamination Certificate

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07957241

ABSTRACT:
A device for detecting defect signals on an optical disc includes a finite state machine (FSM) to control a servo system of an optical disk drive. When the FSM is in a DETECT state and defect signals are greater than thresholds, a detection counter is set to a first predetermined value and the FSM enters an ARM state. In the ARM state, when the detection counter counts zero, the FSM enters a KICK state and the detection counter is set to a second predetermined value. In the KICK state, a flag signal XDFCT is asserted. When the detection counter in the KICK state counts to zero, the FSM enters a WAIT state and the detection counter is set to a third predetermined value. When the flag signal XDFCT is asserted, corresponding servo control signals for the servo system are clamped to a programmable constant voltage.

REFERENCES:
patent: 6807137 (2004-10-01), Chuang
patent: 7301871 (2007-11-01), Lai et al.

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