Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Reexamination Certificate
2007-03-20
2007-03-20
Korzuch, William (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
C360S046000, C375S232000
Reexamination Certificate
active
10809230
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.
REFERENCES:
patent: 5060088 (1991-10-01), Dolivo et al.
patent: 5999355 (1999-12-01), Behrens et al.
patent: 6122120 (2000-09-01), Shimoda
patent: 6292511 (2001-09-01), Goldston et al.
Cideciyan Roy D.
Dholakia Ajay
Eleftheriou Evangelos S.
Galbraith Richard L.
Hanson Weldon M.
Chambliss Bahner & Stophel P.C.
Hitachi Global Storage Technologies - Netherlands B.V.
Korzuch William
Lynch David W.
Negrón Daniell L.
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