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

1995-01-24

1996-04-16

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 59, 369 32, 360 46, 360 51, G11B 700

Patent

active

055089933

ABSTRACT:
A digital signal reproducing apparatus using a Viterbi decoder, reproduces a digital signal without deteriorating the decoding performance even if a DC component is included in recorded data or the optical characteristics such as a reflection index or a refraction factor of an optical recording medium has altered. The digital signal reproducing apparatus converts read signals read from a recording medium to a digital sample value series by means of A/D conversion, extracts specified sample values from the sample value series to use an average of the specified sample values as an offset level, and uniformly adds a value corresponding to this offset level to each estimated sample value in a Viterbi decoder.

REFERENCES:
patent: 5289190 (1994-02-01), Shimoda et al.
patent: 5440532 (1995-08-01), Yokogawa et al.
patent: 5455813 (1995-10-01), Hayashi

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