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:
Mar. 20, 2007
Filed:
Mar. 25, 2004
Roy D. Cideciyan, Rueschlikon, CH;
Ajay Dholakia, Gattikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Richard L. Galbraith, Rochester, MN (US);
Weldon M. Hanson, Rochester, MN (US);
Thomas Mittelholzer, Zurich, CH;
Travis R. Oenning, Rochester, MN (US);
Michael J. Ross, Rochester, MN (US);
David J. Stanek, Rochester, MN (US);
Roy D. Cideciyan, Rueschlikon, CH;
Ajay Dholakia, Gattikon, CH;
Evangelos S. Eleftheriou, Zurich, CH;
Richard L. Galbraith, Rochester, MN (US);
Weldon M. Hanson, Rochester, MN (US);
Thomas Mittelholzer, Zurich, CH;
Travis R. Oenning, Rochester, MN (US);
Michael J. Ross, Rochester, MN (US);
David J. Stanek, Rochester, MN (US);
Hitachi Global Storage Technologies Netherlands, B.V., Amsterdam, NL;
Abstract
An apparatus for providing dynamic equalizer optimization is disclosed. The present invention solves the above-described problems by providing equalizer coefficient updates that converge towards the same solution as the direct method without having to first write a known pattern to the disk or requiring any prior knowledge of the data already written on the disk. The adaptive cosine function may be used to modify only a DFIR tap set, only the j and k parameters of a cosine equalizer or to modify both the tap set for a DFIR filter and the j and k parameters of the cosine equalizer. Another algorithm, such as the LMS algorithm, may be used to modify parameters not modified by the cosine algorithm.