Data reproduction method and apparatus

Details Data reproduction method and apparatus Data reproduction method and apparatus

1996-03-20

1997-10-07

Edun, Muhammad N.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 47, 369 50, 360 51, 360 46, G11B 700

Patent

active

056755651

ABSTRACT:
A system for reproducing data recorded in an optical disk as a signal obtained by modulating the data in accordance with a predetermined partial response characteristic, includes an optical head for reproducing the signal from the optical disk, a VCO for generating a clock, an A/D converter for obtaining a sampling value from the reproduction signal in synchronism with the clock, a maximum likelihood decoder for detecting a maximum likelihood decode data on the basis of the sampling value in synchronism with the clock, a demodulator for demodulating the decode data from the maximum likelihood decoder, wherein the maximum likelihood decoder includes a phase error detecting unit for detecting a phase error between the clock and a point of time when the reproduction signal is sampled, and a phase error correcting unit for correcting the detected phase error.

REFERENCES:
patent: 5469415 (1995-11-01), Fujita et al.
patent: 5517476 (1996-05-01), Hayashi

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