Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Reexamination Certificate
2011-03-01
2011-03-01
Olson, Jason C (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
C360S065000, C360S039000
Reexamination Certificate
active
07898756
ABSTRACT:
A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of read signal samples when reading a training data sequence recorded on the disk, and an equalizer comprising a plurality of coefficients equalizes the read signal samples to generate a sequence of equalized samples. A sequence detector detects an estimated data sequence from the equalized samples, wherein the sequence detector operates according to a target response comprising a plurality of target values. Control circuitry adapts the target values by computing error values in response to a difference between expected samples and the equalized samples, computing a gradient in response to a correlation of the training data sequence with the error values, and adjusting at least one of the target values in response to the gradient.
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Olson Jason C
Western Digital Technologies Inc.
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