Generation of amplitude levels for a partial response maximum likelihood (PRML) bit detector
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United States of America Patent
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Jun 6, 2006
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app pub date -
Mar 31, 2003
filing date -
Sep 18, 1998
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Abstract
An apparatus for deriving amplitude values from an input information signal, which amplitude values can he used as reference levels for the states of a finite state machine, which are needed for the computation of the likelihood functional in a partial response maximum likelihood bit detection apparatus. The apparatus includes an input for receiving the input information signal, a conversion device that derives a digital signal from the input information signal, a detection device for repeatedly detecting a state from subsequent sequences of n subsequent bits in the digital signal, a sample value determining mechanism for deriving sample values from input information signal, a processing mechanism for processing the sample values belonging to sequences of n bits of the same state, an output mechanism for supplying the processed signal values for each possible state as the amplitude values that can be used in the partial response maximum likelihood bit detection apparatus.
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