Method of maximum likelihood decoding and digital information pl

Details Method of maximum likelihood decoding and digital information pl Method of maximum likelihood decoding and digital information pl

1996-06-21

1998-02-17

Edun, Muhammad N.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 47, 369124, 360 48, G11B 700

Patent

active

057198438

ABSTRACT:
A digital information playback apparatus comprises A/D converter that converts a playback signal into digital data, a maximum likelihood decoder that decodes the quantized data output from the A/D converter to obtain the original digital information, and a timing signal extractor that generates a sampling clock used in the A/D converter, and wherein the maximum likelihood decoder detects the response characteristic of the record/playback system and obtains level fluctuations contained in the playback signal, based on the survival path obtained as a maximum likelihood decoding result, to control the expected multilevel equalized values used in the maximum likelihood decoder, the timing signal extractor obtains level fluctuations, based on the survival path obtained as a maximum likelihood decoding result, and obtains the component of the level fluctuations due to phase shifts of the sampling clock of the VCO to control the phase of the sampling clock of the VCO.

REFERENCES:
patent: 5095392 (1992-03-01), Shimazaki et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5400189 (1995-03-01), Sato et al.

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