Digital signal reproducing apparatus using a viterbi decoder

Details Digital signal reproducing apparatus using a viterbi decoder Digital signal reproducing apparatus using a viterbi decoder

1995-01-30

1996-05-14

Epps, Georgia Y.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 50, 369 47, 369124, 360 51, G11B 700

Patent

active

055174760

ABSTRACT:
A digital signal reproducing apparatus which can reproduce a digital signal without deteriorating the performance of a Viterbi decoder being deteriorated even if a positional error due to some mechanism causes in reproducing information from a recording medium or amplitude fluctuation in a red signal due to fluctuation in characteristics of the recording medium should occur. The digital signal reproducing apparatus performs an A/D conversion of a read signal read from the recording medium to convert it to a digital sample value series, obtains an amplitude value according to a result of subtraction between a maximum sample value having a maximum level of sample values in the sample value series and a minimum sample value having a minimum level of sample values in said sample value series, and supplies a value obtained by uniformly each of the estimated sample values in a Viterbi decoder by this amplitude value as a final estimated sample value to the Viterbi decoder.

REFERENCES:
patent: 5448544 (1995-09-01), Tsuchinaga et al.

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