公开(公告)号：EP2361432A1

公开(公告)日：2011-08-31

申请号：EP08876525.0

申请日：2008-12-23

申请人： LSI Corporation

发明人： LEE, Yuan, Xing ,  SAI, Fuminori ,  YANG, Shaohua

IPC分类号： G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B27/30

CPC分类号： G11B20/10009 ,  G11B5/596 ,  G11B20/1217 ,  G11B20/1403 ,  G11B20/1426 ,  G11B27/3027 ,  G11B2020/1287 ,  G11B2020/1476 ,  G11B2220/20

摘要： Methods and apparatus are provided for detecting a syncMark in a read channel, such as a hard disk drive. A syncMark is detected in a sector in an iterative read channel by obtaining a sector signal from a storage media, the sector signal comprising a first syncMark, data and a second syncMark substantially at an end of the sector; determining whether the first syncMark is detected in the sector signal; searching for the second syncMark if the first syncMark is not detected in the sector signal; and detecting and decoding the sector signal based on a detection of the second syncMark. The second syncMark may be positioned, for example, following data in the sector signal. The second syncMark can be searched for in a window within the signal sector that is based on an estimated location of the first syncMark.

公开(公告)号：EP2356655A2

公开(公告)日：2011-08-17

申请号：EP08876524.3

申请日：2008-12-23

申请人： LSI Corporation

发明人： LIU, Jingfeng ,  YANG, Shaohua ,  SONG, Hongwei ,  LEE, Yuan, Xing

IPC分类号： G11B20/18 ,  H03M13/11

CPC分类号： G11B20/18 ,  G11B2020/183 ,  G11B2220/2516 ,  H03M13/1105 ,  H03M13/2948 ,  H03M13/2957 ,  H03M13/6343

摘要： Methods and apparatus are provided for improved physical re-read operations in a hard disk drive. The disclosed methods and apparatus selectively retain data in a hard disk drive, A signal is read in an iterative read channel by assigning a reliability metric to each of a plurality of segments in a read signal; repeating the assigning step for a plurality of read operations; and selectively retaining the segments based on the assigned reliability metric. The read signal can be obtained by positioning a transducer over a storage media. The reliability metric may be based on soft bit decisions; log likelihood ratios or a noise estimation of a given segment.

公开(公告)号：EP2340507A1

公开(公告)日：2011-07-06

申请号：EP09805985.0

申请日：2009-04-02

申请人： LSI Corporation

发明人： LI, Zongwang ,  YANG, Shaohua ,  HAN, Yang ,  ZHONG, Hao ,  LEE, Yuan, Xing ,  TAN, Weijun

IPC分类号： G06K5/04

CPC分类号： H03M13/2957 ,  H03M13/1102 ,  H03M13/1111 ,  H03M13/2948 ,  H03M13/3927 ,  H03M13/458 ,  H03M13/6331 ,  H03M13/6343

摘要： Certain embodiments of the present invention are improved turbo-equalization methods for decoding encoded codewords. In one embodiment, in global decoding iteration i, the magnitude values of all decoder- input LLR values (L
ch ) are adjusted based on the number b of unsatisfied check nodes in the decoded codeword produced by global iteration
i -1. The improved turbo-equalization methods can be used as the sole turbo-equalization method for a given global decoding session, or interleaved with other turbo-equalization methods.

公开(公告)号：EP2425430A1

公开(公告)日：2012-03-07

申请号：EP09844141.3

申请日：2009-04-28

申请人： LSI Corporation

发明人： TAN, Weijun ,  YANG, Shaohua ,  FITZPATRICK, Kelly ,  LI, Zongwang ,  ZHONG, Hao

IPC分类号： G11B20/10 ,  G11B20/14

CPC分类号： G11B20/1803 ,  G11B20/10222 ,  G11B2020/10722 ,  G11B2020/10759 ,  G11B2020/1287 ,  G11B2020/1289 ,  G11B2020/185 ,  H03M13/1111 ,  H03M13/112 ,  H03M13/2957 ,  H03M13/3746 ,  H03M13/6343

摘要： Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing system is disclosed that includes a decoder circuit providing a decoded output, and a dynamic scalar calculation circuit that determines a first dynamic scaling value and a second dynamic scaling value based at least in part on the decoded output. A first multiplier circuit multiplies the decoded output by the first dynamic scaling value and provides a first scaled output. A detector circuit receives the first scaled output and provides a detected output. A second multiplier circuit multiplies the detected output by the second dynamic scaling value and provides a second scaled output.

公开(公告)号：EP2347416A1

公开(公告)日：2011-07-27

申请号：EP09827908.6

申请日：2009-04-17

申请人： LSI Corporation

发明人： YANG, Shaohua ,  LEE, Yuan, Xing ,  RAUSCHMAYER, Richard ,  SONG, Hongwei ,  LIU, Jingfeng ,  TAN, Weijun

IPC分类号： G11B20/24 ,  G11B20/10

CPC分类号： G11B20/24 ,  G11B20/10037 ,  G11B20/10194 ,  G11B20/10527 ,  G11B20/1833 ,  G11B20/1879 ,  G11B2020/1062 ,  G11B2020/10685 ,  G11B2020/10694 ,  G11B2020/10759 ,  G11B2020/183 ,  G11B2020/185 ,  G11B2220/2516 ,  H03M13/1105 ,  H03M13/2948 ,  H03M13/3746 ,  H03M13/6343 ,  H04L1/005 ,  H04L1/0057

摘要： Various embodiments of the present invention provide systems and methods for data processing. For example, some embodiments of the present invention provide noise reduced data processing circuits. Such circuits include a selector circuit, a sample set averaging circuit, and a data detection circuit. The selector circuit provides either a new sample set or an averaged sample set as a sample output based on a select control signal. The sample set averaging circuit receives the new sample set and provides the averaged sample set. The averaged sample set is based upon two or more instances of the new sample set. The data detection circuit receives the sample output, and performs a data detection algorithm on the sample output and provides the select control signal and a data output.