Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1995-10-20
1998-06-02
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
364825, G11B 509
Patent
active
057609845
ABSTRACT:
A sampled amplitude read channel reads information stored on a magnetic medium by detecting digital data from a sequence of discrete time interpolated sample values, the interpolated sample values generated by interpolating a sequence of discrete time channel sample values generated by sampling pulses in an analog read signal from a magnetic read head positioned over the magnetic medium. A write VFO generates a write clock for writing digital data to the magnetic medium at a predetermined baud rate for a selected zone, and upon read back, the write VFO generates a sampling clock at a frequency slightly higher than the write frequency. A sampling device samples the analog read signal at the sampling clock rate to generate a sequence of discrete time channel samples that are not synchronized to the baud rate, and the channel samples are equalized by a discrete time equalizing filter according to a predetermined partial response (PR4, EPR4, EEPR4, etc.). An interpolating timing recovery circuit, responsive to the equalized channel samples, computes an interpolation interval .tau. and, in response thereto, generates interpolated sample values substantially synchronized to the baud rate. The timing recovery circuit also generates a data clock for clocking a discrete time sequence detector which detects the digital data from the interpolated sample values. In a cost reduced implementation, the interpolation filter coefficients are computed in real time as a function of the interpolation interval .tau..
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Behrens Richard T.
Spurbeck Mark S.
Cirrus Logic Inc.
Psitos Aristotelis M.
Sheerin Howard H.
Shifrin Dan A.
Wamsley Patrick
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