| 摘要 |
The PSK demodulator comprises: voltage controlled oscillator means (8) responsive to a control signal; frequency converter means (9) for frequency converting an input PSK signal with the output of the voltage controlled, oscillator means; carrier recovery circuit means (2) for recovering a carrier wave from the output of the frequency converter means; band-pass filter means (4) receiving the carrier wave; phase detector means (1) for phase detecting the output of the frequency converter means with the output of said band-pass filter means and providing a demodulated signal; phase comparator means (6) for detecting the phase difference between the input and output signals of the band-pass filter means; and low-pass filter means (7) responsive to the output of the phase comparator means for providing the control signal. This PSK demodulator is essentially unaffected by frequency fluctuations of the input modulated waves. |
