Optical storage device decoding method

Details Optical storage device decoding method Optical storage device decoding method

2008-01-29

2008-01-29

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

C341S050000

Reexamination Certificate

active

07324023

ABSTRACT:
A decoding method for optical storage device, which decodes channel bits upon a disc by partial response maximum likelihood (PRML) detection, is proposed. Unlike the conventional skills, the present method does not decode the detected RF signals directly, but adjusts values of parts of detected RF signals to their original ideal values before channel decoding instead, thereby reducing the decoding error rate of channel bits. The decoding method includes the step of: retrieving a first sequence of RF signals; identifying if the first sequence of RF signals contains a signal combination which satisfies a particular condition; adjusting a plurality of RF signals in the first sequence of RF signals to some pre-determined RF signals' value and then forming a second sequence of RF signals; and decoding the second sequence of RF signals. In a preferred embodiment of the invention, the method is applied to an optical storage system of PR (1,2,2,2,1) channel.

REFERENCES:
patent: 6859761 (2005-02-01), Bensky et al.
patent: 7049815 (2006-05-01), Itskovich et al.

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