Apparatus and method of correcting offset

Details Apparatus and method of correcting offset Apparatus and method of correcting offset

2007-02-06

2007-02-06

Lamarre, Guy J. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S794000, C714S796000, C714S792000, C375S262000, C375S341000, C375S265000

Reexamination Certificate

active

10686472

ABSTRACT:
An apparatus for correcting offset includes an optical pickup converting data recorded on an optical disc to an electrical signal; an AD converter quantizing a reproduction signal for each clock in synchronization with a bit period of the reproduction signal and sequentially outputting the signal as a quantized data column for each clock; an adder adding an offset adjustment amount to the quantized data column serving as an input signal; a Viterbi decoder performing Viterbi decoding on the signal after offset adjustment for binarization; and an offset correction value operating unit calculating the offset adjustment amount so that a value obtained by dividing a standard deviation of path metric difference between a survivor path and another path merged into the survivor path in the Viterbi decoder by an average of the path metric difference is minimized.

REFERENCES:
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patent: 07-122000 (1995-05-01), None
patent: 09-245436 (1997-09-01), None
patent: 10-021651 (1998-01-01), None
patent: 10-038606 (1998-02-01), None
patent: 10-172238 (1998-06-01), None

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