Read system for implementing PR4 and higher order PRML signals

Details Read system for implementing PR4 and higher order PRML signals Read system for implementing PR4 and higher order PRML signals

1995-09-05

1998-06-16

Chin, Wellington

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375290, 364140, 360 46, G11B 509, G11B 2010

Patent

active

057683204

ABSTRACT:
A read system for implementing PR4 and higher order PRML signals includes: a continuous time programmable filter, for receiving a read signal representative of a binary signal from a storage medium and for shaping the read signal into a PR4 shaped read signal; an analog finite impulse response (AFIR) filter, responsive to the continuous time programmable filter, for sampling and forming the PR4 shaped read signal into a PR4 shaped multilevel read signal; an analog to digital converter, responsive to the AFIR filter, for converting the PR4 shaped multilevel read signal from analog to digital; a data sequence filter, responsive to the analog to digital converter, for transforming the PR4 shaped multilevel digital read signal to a predetermined order PRML signal; and a Viterbi detector, responsive to the data sequence filter, for detecting the binary signal from the predetermined order PRML signal.

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