Patent ID: 6265994
Filing Date: 2001-07-24
Classification: H03M

Abstract:
A device for encoding a stream of databits of a binary source signal into a stream of databits of a binary channel signal, the binary source signal comprising a sequence of consecutive n-bit source words and the binary channel signal comprising a sequence of consecutive m-bit channel words, the device comprisinginput means for receiving the binary source signal,merging means for receiving a first input signal that equals the binary source signal or a shuffled version thereof, and for merging a q-bit merging word each time between subsequent groups of y consecutive bits in said first input signal, in response to a control signal,control signal generator means for generating said control signal,shuffling means for receiving a second signal that equals said binary source signal or said binary source signal merged with said q-bit merging words in said merging means, and for carrying out a shuffling operation on each second group of said groups of y consecutive bits, the combined steps of merging in said merging means and shuffling in said shuffling means resulting in a shuffled composite binary source signal, comprising a sequence of n-bit words, y, n and q being integers for which holds: y>1, n>1 and q.gtoreq.1,converting means for converting the shuffled composite binary source signal into said binary channel signal, by converting subsequent blocks of p consecutive n-bit words in said shuffled composite binary source signal into corresponding subsequent blocks of p consecutive m-bit channel words in said binary channel signal, m and p being integers for which hold: m>n, p.gtoreq.1, and where p can varyoutput means for supplying said binary channel signal, the shuffling operation comprising the step of repositioning in each of said second groups of y consecutive bits, q bits in the group into another position in the said group, such that, except for the n-bit words comprising a merging word, the n-bit words in said shuffled composite binary source signal, required for conversion into m-bit channel words, are aligned with the n-bit source words in said shuffled composite binary source signal, and that n=2q.