Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate
2006-02-28
2006-02-28
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Binary pulse train information signal
Including sampling or a/d converting
C369S047250
Reexamination Certificate
active
07006421
ABSTRACT:
A method and an apparatus are provided which are capable of evaluating a state of a signal with a fewer number of samples compared with an error rate. A reproducing signal obtained from a magneto-optical disk is subjected to maximum-likelihood decode in a maximum-likelihood decoder, paths coupling with each other in the maximum-likelihood decode is detected by an evaluation index generation unit and, at the same time, a difference of likelihoods (path metrics) of those paths is obtained to adjust a parameter of a recording and reproducing signal or a control signal of an optical pickup based on the likelihood difference. The parameter is, for example, auto-tracking, a gain of an auto-focusing loop, or an offset value, or a gain value of a reproducing signal, a recording power, or a reproducing power intensity.
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