公开(公告)号：SG87129A1

公开(公告)日：2002-03-19

申请号：SG200003552

申请日：2000-06-24

Applicant: IBM

Inventor： ROY D CIDECIYAN ,  JONATHAN DARREL COKER ,  EVANGELOS STAVROS ELEFTHERIOU ,  RICHARD LEO GALBRAITH ,  TODD TRUAX

IPC: G11B20/14 ,  G11B20/18 ,  G06F11/10 ,  H03M5/14 ,  H03M7/14 ,  H03M7/42 ,  H03M13/01 ,  H03M13/05 ,  H03M13/31 ,  H04L1/00 ,  H04L25/49

Abstract: A method and apparatus for encoding a plurality of successive m-bit binary data words to produce a plurality of successive of n-bit binary code words, where n and m are positive integers and n is greater than m, for supply to a magnetic recording channel. Each m-bit binary data word is partitioned into a plurality of blocks of bits, and at least one said blocks of bits in each m-bit binary data word is encoded in accordance with a finite-state coding scheme to produce a plurality of successive n-bit binary code words. At least one stage of violation correction which transforms the plurality of successive n-bit binary code words. Violation correction includes detecting the occurrence of any of a plurality of prohibited bit patterns at one or more predetermined locations within each n-bit binary coded word, and replacing any prohibited bit pattern so detected by a corresponding substitute bit pattern. The finite-state coding scheme, the prohibited bit patterns, and corresponding substitute bit patterns are predetermined such that in a serial bit-steam comprising the successive n-bit binary code words, the maximum number of consecutive bits of a first value is limited to a first predetermined number j, where b greater or equal to 2, and the maximum number of consecutive bits of the a second value is limited to a second predetermined number k.