An analog to digital wave shaping system comprising, a source of analog signals, adaptive threshold circuitry coupled to said source, said adaptive threshold circuitry having an output selected as a function of the intensity of said analog signal compared to a fixed intensity signal, and, comparator...http://www.google.es/patents/US4091379?utm_source=gb-gplus-sharePatente US4091379 - Analog to digital wave shaping system
