A method of modulating digital data to be used for transmitting or recording N-bit (e.g., 8-bit) data comprises a step of converting the input N-bit data into an M+K-bit data selected out of a group of 2.sup.M M+K-bit data according to a predetermined rule, the group of 2.sup.M M+K-bit data being obtained...http://www.google.co.uk/patents/US6144324?utm_source=gb-gplus-sharePatent US6144324 - Method of modulating and demodulating digital data and digital data modulator/demodulator
