provision circuitale for demo purpose signal modulation phase

摘要

Apparatus for demodulating phase modulated signals is described. The latter signals are produced by modulation of a carrier or harmonically related carriers. The modulated signal, constituted by consecutive modulation sections, is coupled to an analogue multiplier, the output of which is connected to an integrator. The integrator produces the demodulated signal. A pulse generator produces a sequence of pulses, each of which occurs within a given modulation section. The duration of each pulse equals the reciprocal of the fundamental frequency. A carrier corresponding in frequency and synchronized with the transmitted carrier is produced in the receiver. The transmitted carrier and receiver-produced carrier are coupled to the multiplier. The latter carrier is switched prior to its application to the multiplier using the output of the pulse generator.