The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2015
Filed:
Apr. 15, 2014
International Business Machines Corporation, Armonk, NY (US);
Katherine T. Blinick, Tucson, AZ (US);
Robert A. Hutchins, Tucson, AZ (US);
Thomas Mittelholzer, Zurich, CH;
Sedat Oelcer, Kilchberg, CH;
International Business Machines Corporation, Armonk, NY (US);
Abstract
In one embodiment, a method includes passing a signal through an adaptive noise whitening filter, wherein one or more noise whitening coefficients used in the noise whitening filter are updated using a noise whitening filter coefficient updater, wherein the noise whitening filter is configured to process the signal according to a transfer polynomial: W(D)=1−(pD+ . . . +pD), where p. . . pare noise whitening coefficients, where a tape channel is characterized by a transfer polynomial F(D)=1+fD+ . . . +fDwhere D is delay corresponding to bit duration, with 2being a number of states of the tape channel, wherein a soft detector has a total of 2states, the noise whitening filter comprises 2states, λ' is greater than λ, L represents a memory length of the tape channel, and λ represents a memory length of the noise whitening filter.