Patent ID: 7218262

Claim:
A modulation method comprising the steps of: generating an L-bit output code word in response to every M-bit input code word by referring to a set of encoding tables, wherein L denotes an integer equal to 6 multiplied by a predetermined natural number N, and M denotes an integer equal to 4 multiplied by the predetermined natural number N, wherein the encoding tables contain output code words assigned to input code words, and contain encoding-table designation information accompanying each output code word, and wherein the encoding-table designation information designates an encoding table among the encoding tables which is used next to generate an output code word immediately following the output code word accompanied with the encoding-table designation information; and sequentially connecting the generated output code words into a sequence of the generated output code words which follows predetermined run length limiting rules (1, k)RLL, wherein “k” denotes a predetermined natural number between 7 and 12.