METHOD OF CONVERTING A STREAM OF DATABITS OF A BINARY INFORMATION SIGNAL INTO A STREAM OF DATABITS OF A CONSTRAINED BINARY CHANNEL SIGNAL, A DEVICE FOR CODING, A SIGNAL COMPRISING A STREAM OF DATABITS OF A CONSTRAINED BINARY CHANNEL SIGNAL, A RECORD CARRIER AND DEVICE FOR CODING

摘要

A stream of databits of the binary information signal is divided into n-bit information words. These information words are converted into m1-bit channel words, in accordance with a channel code C1, or m2-bit channel words, in accordance with a channel code C1 , where m1, m2 and n are integers for whoch it holds that m1 m2 = n. The m2-bit channel word is chosen from at least two m2-bit channel words, at least two of which have opposite parities, the concatenated m1-bit channel words and the m2-bit channel words complying with a runlength constraint of the binary channel signal. The coding state of channel code C1 is established in dependence upon an end part of the preceding channel word, the coding state of channel code C2 being established in dependence upon en end part of the preceding channel word.