DIGITAL TYPE PHASE SYNCHRONIZER TOWARD SAME FREQUENCY SIGNALAND PARTICULARLY SIGNAL DEMODULATOR

摘要

One of the signals (B) at the same frequency which are to be submitted to phase synchronization is generated at multiple frequency (A) by a frequency generator 11, and then submitted to frequency division in a frequency divider 6. A phase detector 13 detects the phase error between the above mentioned signals and a digital phase error detector 9 transforms said phase error into a digital control signal for a lead/lag circuit 5 for advancing or delaying the commutation instants of digital signals, which circuit 5 is interposed between said frequency generator 11 and said frequency divider 6. The signal B forms a reconstructed carrier for demodulating received signal M by beating 7 and filtering 12, e.g. in a television.