| 摘要 |
A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C), wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (y1, y2, y3). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I) (FIG. 1). The relations hold that m>n>=1, p>=1, and that p can vary. Preferably, m=n+1.The device is adapted to convert the 8-bit bit sequence "00010001' in the source signal into the 12-bit bitsequence "100010010010' and to convert the 8-bit bitsequence "10010001' into the 12-bit bitsequence "000010010010', in order to limit the repeated minimum transition runlength in the channel signal. Also other 8-bit sequences require a specific encoding into 12-bit bitsequences in order to limit the k-constraint of the channel signal to 7.Further, a decoding device is disclosed for decoding the channel signal obtained by means of the encoding device.
|
