Apparatus for providing data dependent detection in a data...

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit

Reexamination Certificate

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C360S025000, C360S039000, C360S065000, C360S029000, C375S262000, C375S265000, C375S341000, C714S794000, C714S795000, C714S799000

Reexamination Certificate

active

10683646

ABSTRACT:
An apparatus for providing data dependent detection in a data read channel is disclosed. Parameters in a read channel are dynamically adjusted according to data dependent noise. For example, a comparison in an add-compare-select (ACS) unit of a Viterbi decoder may be adjusted or offset terms in error event filters may be biased to choose a Viterbi sequence with more transitions or to compensate for polarity dependent noise.

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