Patent ID: 11862194
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions being executable by a processing circuit to cause the processing circuit to:
receive, from a head, a signal representing data stored on a storage medium;
receive, from an estimator, an estimated signal comprising a superposition of an estimated linear portion of a partial-response equalizer output and an estimated nonlinear portion of the signal;
apply one or more noise whitening filters to a difference between the signal and the estimated signal to produce a filtered signal;
perform one or more branch metric calculations on a metric input signal based on the filtered signal to produce one or more branch metrics;
generate an output stream representing the data based on the one or more branch metrics; and
based on the signal and the output stream, update the estimated signal.