A circuit receiving a degraded synchronous pulse signal which has missing pulses and phase-shifted pulses, and producing an output signal similar to and at a constant phase angle with the input signal, in which the missing pulses have been replaced and the phase-shifted pulses shifted to the correct...http://www.google.com/patents/US4059812?utm_source=gb-gplus-sharePatent US4059812 - Synchronous pulse generator including flywheel tank circuit with phase locked loop
