公开(公告)号：DE68926314D1

公开(公告)日：1996-05-30

申请号：DE68926314

申请日：1989-02-15

Applicant: IBM

Inventor： KARABED RAZMIK ,  SIEGEL PAUL HOWARD

IPC: G11B20/10 ,  H03M13/23 ,  H04L25/08 ,  H04L25/49 ,  H04L25/497 ,  H03M13/00 ,  H03M5/14 ,  H03M13/12

Abstract: An improved method is described for coding input strings to improve reliability of partial response channels. This method comprises encoding an input string into an intermediate string using a binary convolutional code, and encoding the intermediate string using a non-linear inner code that repeats and inverts selected bits of the intermediate string. The inner code has a coding rate of less than one. As specifically illustrated, this method provides coding gains for partial response channels of at least 4.8 dB.

公开(公告)号：DE3888418T2

公开(公告)日：1994-10-06

申请号：DE3888418

申请日：1988-05-20

Applicant: IBM

Inventor： MARCUS BRIAN HARRY ,  PATEL ARVIND MOTIBHAI ,  SIEGEL PAUL HOWARD

IPC: H03M7/14 ,  H03M5/14 ,  H03M13/23 ,  H04L25/497

Abstract: There is disclosed a rate 8/9, constrained partial response class IV code having run length limitation parameters (0,3/5) is provided for any partial response (PR) signalling system employing maximum likelihood (ML) detection.

公开(公告)号：DE69027837D1

公开(公告)日：1996-08-22

申请号：DE69027837

申请日：1990-11-07

Applicant: IBM

Inventor： KARABED RAZMIK ,  SIEGEL PAUL HOWARD

IPC: H03M5/14 ,  G11B20/10 ,  G11B20/14 ,  H03M7/14 ,  H03M7/30 ,  H03M13/31 ,  H04L25/49 ,  H04L25/497 ,  H03M13/12

公开(公告)号：DE3888418D1

公开(公告)日：1994-04-21

申请号：DE3888418

申请日：1988-05-20

Applicant: IBM

Inventor： MARCUS BRIAN HARRY ,  PATEL ARVIND MOTIBHAI ,  SIEGEL PAUL HOWARD

IPC: H03M7/14 ,  H03M5/14 ,  H03M13/23 ,  H04L25/497

Abstract: There is disclosed a rate 8/9, constrained partial response class IV code having run length limitation parameters (0,3/5) is provided for any partial response (PR) signalling system employing maximum likelihood (ML) detection.

公开(公告)号：DE68926314T2

公开(公告)日：1996-11-21

申请号：DE68926314

申请日：1989-02-15

Applicant: IBM

Inventor： KARABED RAZMIK ,  SIEGEL PAUL HOWARD

IPC: G11B20/10 ,  H03M13/23 ,  H04L25/08 ,  H04L25/49 ,  H04L25/497 ,  H03M13/00 ,  H03M5/14 ,  H03M13/12

Abstract: An improved method is described for coding input strings to improve reliability of partial response channels. This method comprises encoding an input string into an intermediate string using a binary convolutional code, and encoding the intermediate string using a non-linear inner code that repeats and inverts selected bits of the intermediate string. The inner code has a coding rate of less than one. As specifically illustrated, this method provides coding gains for partial response channels of at least 4.8 dB.

公开(公告)号：DE3577769D1

公开(公告)日：1990-06-21

申请号：DE3577769

申请日：1985-10-17

Applicant: IBM

Inventor： LANGDON JR ,  SIEGEL PAUL HOWARD

IPC: H03M5/16 ,  G11B20/14 ,  G11B20/10 ,  G11B20/12 ,  G11B20/16

Abstract: The present invention relates to apparatus for recording representations of a binary symbol sequence which comprises conversion means (1) for converting the binary symbol sequence into a ternary symbol sequence, and recording means (3, 5, 7) for recording representations of the ternary symbol sequence. In accordance with the invention, the recording apparatus is characterised in that the conversion means comprises mapping means for mapping the binary symbol sequence into a direction constrained run length limited ternary symbol sequence, and the recording means comprises means for recording the ternary symbol sequence as selected recording levels with half transitions and full transitions between recording levels in such a way that each half transition is followed by another half transition of the same polarity. … The present invention also relates to a method of recording representations of a binary symbol sequence utilising recording apparatus as above. … The invention further relates to a combination of recording apparatus as above with means (11 to 16) for recovering the binary symbol sequence from the recorded representations, and to a combination of a method of recording as above with a method of recovering the binary symbol sequence from the recorded representations.