Design techniques for weakly constrained codes

A general method of constructing run-length limited ( , ) constrained codes from arbitrary sequences is introduced. This method is then combined with the method of guided scrambling for constructing a class of weakly constrained codes. The proposed codes are analyzed for the case of = 0 and are shown to give results which are better or comparable to those of the best available codes, however, at the cost of failure with some very low probability. For 0, the code efficiency of the codes constructed according to the proposed method reduces significantly.