Information reproducing apparatus using maximum likelihood...

Details Information reproducing apparatus using maximum likelihood... Information reproducing apparatus using maximum likelihood...

2007-10-30

2007-10-30

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C714S794000

Reexamination Certificate

active

10882329

ABSTRACT:
An apparatus is provided in which a parameter of Viterbi decoding is adjusted on the basis of a metric difference for evaluation of PRML signal quality to increase the error rate even when using a medium on which recording is performed under a large-distortion condition. When a reproduced signal is binarized by maximum likelihood decoding such that a state transition sequence most probable to be correct of m kinds of state transition sequences from a first state at time n−1 to a second state at time n is selected, a metric difference between the most probable state transition sequence and a second most probable state transition sequence at a predetermined time is computed, and a parameter (a reference amplitude value or a metric) of a maximum likelihood decoder is corrected on the basis of the metric difference to optimize maximum likelihood decoding operation.

REFERENCES:
patent: 5541955 (1996-07-01), Jacobsmeyer
patent: 5729517 (1998-03-01), Fujiwara et al.
patent: 6711111 (2004-03-01), Okamoto et al.
patent: 2003/0067998 (2003-04-01), Nakajima et al.
patent: 2004/0064780 (2004-04-01), Ide
patent: 2003-141823 (2003-05-01), None
patent: 2003-151200 (2003-05-01), None

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