| 摘要 |
PURPOSE:To eliminate the need to supply a carrier wave signal from a transmission side, by using a phase different detector, sampling circuit, phase shift detector, phase difference estimating circuit, phase difference absorbing circuit. CONSTITUTION:The phase difference detector 1 detects the phase difference between an input signal applied with K-phase phase modulation and the output of a fixed oscillator 10. The output of a detector 1 is supplied to the sampling circuit 2 to obtain its sampled value. The output of the circuit 2 is supplied to the phase shift detector 3 and a delay circuit 8. A detector 3 finds the angular phase display of the rule 2pi/K of the phase shift between sampled values Pi and Pi-1 and adds it the phase angle D1 of the value P1 successively to find its cumulative value. Outputs of the detector 3 is summed up by an adder 4, and multiplied by ti and summed up by a sum-of-products circuit 5. The phase difference estimating circuit 6 finds the initial phase difference and phase difference acceleration of a sampled value sequence Pi from the outputs of the adder 4 and circuit 5. The output of the circuit 6 is supplied to the phase difference absorbing circuit 7 to obtain a demodulated phase-locked with a carrier. |
