A data handling system is described for encoding an input digital data waveform by a pulse code modulation technique useful to obtain optimum packing density for a recording medium. The encoding technique selects the binary one state of the input waveform for processing and generates an encoded waveform...http://www.google.de/patents/US4232388?utm_source=gb-gplus-sharePatent US4232388 - Method and means for encoding and decoding digital data
