SYSTEM FOR THE TRANSMISSION OF INTELLIGENCE BY MEANS OF SCRAMBLED AUDIOSIGNALS

摘要

A system for the transmission of intelligence signals by means of scrambled audio signals comprising a transmitter, that employs the frequency shift generator to also produce a control signal that is added to the scrambled audio signals to be transmitted to the receiver. The receiver separates the control signal from the scrambled audio signals and employs this control signal to synchronize the receiver with the transmitter thereby effecting the demodulation of the scrambled audio signals by the receiver.