Demodulator for phase modulated carrier pulse signals or phase codes in which the pulses are coded according to a plurality of N phases of the carrier. It comprises a digital phase lock loop system for locking to a frequency equal to N times the carrier frequency which includes at least a two input phase...http://www.google.com/patents/US4059805?utm_source=gb-gplus-sharePatent US4059805 - Phase lock loop carrier generator for receiver of phase modulated carrier pulse signals
