Pseudo-passive universal communicator system

摘要

An apparatus is described for two-way communication between a controller and a communicator. The controller comprises a series of means adapted to generating a carrier signal and to deal with said signal to produce an informational signal. The communicator likewise comprises a series of means directed at producing a electromagnetic wave signal. In accordance with the invention the first means of the controller comprise means to vary the frequency or phase of said carrier signal, and the means for demodulating a second modular carrier signal include means for mixing said carrier signal with said modulated carrier signal.