A proposal on a generalized method for constructing the fixed-length adaptive block recording code

A simple and more generalized algorithm is presented for the design of a fixed-length adaptive block recording code, named the (d, k; m, n) code where d and k are the minimum and maximum run-length of the same symbol, and m and n are the dataword and codeword lengths. This algorithm is based on systematic use of both lookback and lookahead informations and an expanded version of the merging rule by Jacoby. Applications of this algorithm to (2, 9; 3, 6) and (2, 8; 4, 8) NRZI waveform codes are demonstrated.