公开(公告)号：HU0103435A2

公开(公告)日：2002-01-28

申请号：HU0103435

申请日：1999-08-31

Applicant: IBM

Inventor： BUSH GREGORY S ,  CIDECIYAN ROY D ,  COKER JONATHAN D ,  ELEFTHERIOU EVANGELOS S ,  GALBRAITH RICHARD L ,  STANEK DAVID J

IPC: G06F11/08 ,  G06F11/10 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  H03M13/00 ,  H03M13/39 ,  H04L25/03 ,  H04L25/497

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 D2) 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.