Error detection/correction and fault detection/recovery – Pulse or data error handling – Data pulse evaluation/bit decision
Patent
1998-08-31
2000-12-05
Chung, Phung M.
Error detection/correction and fault detection/recovery
Pulse or data error handling
Data pulse evaluation/bit decision
714746, 714794, 375341, H03M 1300
Patent
active
061580279
ABSTRACT:
A noise-predictive data detection method and apparatus are provided for enhanced noise-predictive maximum-likelihood (NPML) data detection in a direct access storage device. A data signal from a data channel in the direct access storage device is applied to a maximum-likelihood detector that provides an estimated sequence signal. A noise bleacher filter having a frequency response of (1+.alpha.D)/1-.beta.D.sup.2) receives a combined estimated sequence signal and data signal and provides a noise filtered signal. A matching and error event filter receives the noise filtered signal and provides an error event filtered signal. An error correction unit receives the estimated sequence signal from the maximum-likelihood detector and receives the error event filtered signal and provides an error corrected estimated sequence signal.
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Bush Gregory S.
Cideciyan Roy D.
Coker Jonathan D.
Eleftheriou Evangelos S.
Galbraith Richard L.
Chung Phung M.
International Business Machines - Corporation
Pennington Joan
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