Data recording/reproducing apparatus having viterbi decoder and

Details Data recording/reproducing apparatus having viterbi decoder and Data recording/reproducing apparatus having viterbi decoder and

1995-02-16

1997-08-19

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

H03M 700

Patent

active

056593090

ABSTRACT:
A data recording/reproducing apparatus and method therefor having a Viterbi decoder which stores operation result values of an inputted reproduced signal and the reference value when the peak value of the reproduced signal is updated, compares this value with the reproduced signal in amplitude, updates the stored value when the result satisfies the predetermined condition, detects a change in the polarity of the comparison result, controls the clock counter depending on the status of the peak value updating signal, sets 1 in the shift register at the position indicated by the counter according to the detected polarity inversion signal when the peak value is updated, and accordingly makes the updating and detecting operations independent of operations of addition and subtraction of the current reproduced signal and reference value and operations of addition and subtraction of amplitude comparison.

REFERENCES:
patent: 5291523 (1994-03-01), Bergmans et al.

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