Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1994-09-21
1997-01-07
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 65, G11B 509, G11B 5035
Patent
active
055923402
ABSTRACT:
An adaptive, analog filter system of a PRML [PARTIAL RESPONSE MAXIMUM LIKELIHOOD ] read channel of a disc drive comprising an adaptive, analog transversal equator connected in series with an adaptive, analog prefilter. The prefilter is comprised of a plurality of serially connected, adaptive, analog filter stages having variable transfer functions determined by adaptive parameter signals received by the filter stages. The transversal equalizer is comprised of a delay circuit, comprised of a plurality of serially connected, adaptive, analog sixth order low pass filters, that is tapped to either side of each low pass filter, a plurality of analog multipliers that receive signals at the tap locations of the delay circuit, and a summing circuit that receives the outputs of the multipliers. The transfer functions of the sixth order low pass filters are continuously variable in relation to adaptive parameter signals received by the low pass filters and the gains of the multipliers are continuously variable in relation to tap weights received by the multipliers.
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Kovner Vladimir
Minuhin Vadim B.
Surendran Srinivasan
Heller III Edward P.
McCarthy Bill D.
McCarthy Randall K.
Seagate Technology Inc.
Sniezek Andrew L.
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