Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1996-04-30
1999-12-07
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 51, 375232, 375326, 375346, 375355, G11B 5035, G11B 509
Patent
active
059993553
ABSTRACT:
A sampled amplitude read channel for magnetic disk recording which asynchronously samples the analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector is disclosed. To minimize interference from the timing and gain control loops, the phase and magnitude response of the adaptive equalizer filter are constrained at a predetermined frequency using an optimal orthogonal projection operation as a modification to a least mean square (LMS) adaptation algorithm. Further, with interpolated timing recovery, the equalizer filter and its associated latency are removed from the timing recovery loop, thereby allowing a higher order discrete time filter and a lower order analog filter.
REFERENCES:
patent: 5060088 (1991-10-01), Dolivo et al.
patent: 5150379 (1992-09-01), Baugh et al.
patent: 5319675 (1994-06-01), Cherubini
patent: 5359631 (1994-10-01), Behrens et al.
patent: 5381359 (1995-01-01), Abbott et al.
patent: 5384725 (1995-01-01), Coifman et al.
patent: 5400189 (1995-03-01), Sato et al.
patent: 5426541 (1995-06-01), Coker et al.
patent: 5430661 (1995-07-01), Fisher et al.
patent: 5450253 (1995-09-01), Seki et al.
patent: 5467370 (1995-11-01), Yamasaki et al.
patent: 5486956 (1996-01-01), Urata
patent: 5487085 (1996-01-01), Wong-Lam et al.
patent: 5559833 (1996-09-01), Hayet
patent: 5561598 (1996-10-01), Nowak et al.
patent: 5585975 (1996-12-01), Bliss
patent: 5602507 (1997-02-01), Suzuki
patent: 5695639 (1997-12-01), Spurbeck et al.
patent: 5781586 (1998-07-01), Tsutsui
William L. Abbott, John M. Coiffi, and Hemant K. Thapar, "Channel Equalization Methods for Magnetic Storage", 1989 ICC '89, Boston, MA., Jun. 1989.
William L. Abbott et al., "A Digital Chip with Adaptive Equalizer for PRML Detection in Hard-Disk Drives", IEEE International Solid-State Circuits Conference, Feb. 18, 1994.
K. Ozeki and T. Umeda, "An Adaptive Filtering Algorithm Using an Orthogonal Projection to an Affine Subspace and Its Properties", Electronics and Communications in Japan, vol. 67-A, No. 5, 1984.
Simon Haykin, Adaptive Filter Theory Second Edition, Prentice Hall, 1991, pp. 383-385.
John M. Cioffi et al., "Adaptive Equalization In Magnetic-Disk Storage Channels", IEEE Communications Magazine, Feb. 1990, pp. 14-29.
Behrens Richard T.
Bliss William G.
Du Li
Dudley Trent O.
Feyh German S.
Cirrus Logic Inc.
Neal Regina Y
Psitos Aristotelis M.
Sheerin Howard H.
Shifrin Dan A.
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