Patent ID: 6710724
Filing Date: 2004-03-23
Classification: G11B,H03M,H04L

Abstract:
A device for encoding a stream of data bits of a binary source into a stream of data bits of a binary channel signal, wherein the bit stream of the source signal is divided into n-bit source words, which device comprises converting means for converting said source words into corresponding m-bit channel words, characterized in that each value of the n-bit source words together with another value of the n-bit source words forms a pair of source words, said device further comprises bit addition means for adding a qth bit at a qth bit position of each n-bit source word such that the values of the source words of said pair of n-bit source words differ only in the bit values of the bits in the qth bit position of the n-bit source words, q being a constant, the pairs of n-bit source words being subdivided into a first part and a remaining part, and the converting means are adapted to convert n-bit source words into m-bit channel words, in such a manner that the conversion of the two source words forming a pair of source words of the first part of the pairs of n-bit source words is parity preserving and the conversion of the two source words forming a pair of source words of the remaining part of the pairs of n-bit source words is parity inverting, wherein the binary channel signal corresponds to information encoded by a record carrier on a track thereof and readable from the track by a reading unit of a decoding device, and said device further comprises an input for interfacing with an output of said decoding device for receiving the binary channel signal from the decoding device, wherein said device only receives and propagates digital signals therein.