Privacy communication system

Claim 1

A PRIVACY SIGNALING SYSTEM COMPRISING A TRANSMITTING STATION AND A RECEIVING STATION CONNECTED BY A WAVE TRANSMISSION MEDIUM, SAID TRANSMITTING STATION COMPRISING A SOURCE OF SIGNAL WAVES TO BE TRANSMITTED AND A SIGNAL TRANSLATING DEVICE HAVING INPUT TERMINALS CONNECTED TO SAID SOURCE AND OUTPUT TERMINALS CONNECTED TO SAID MEDIUM, SAID RECEIVING STATION COMPRISING SIGNAL REPRODUCING MEANS AND A SIGNAL TRANSLATING DEVICE SUBSTANTIALLY IDENTICAL WITH THE SIGNAL TRANSLATING DEVICE AT THE TRANSMITTING STATION, HAVING ITS INPUT TERMINALS CONNECTED TO SAID MEDIUM AND ITS OUTPUT TERMINALS CONNECTED TO SAID SIGNAL REPRODUCING MEANS, EACH OF SAID TRANSLATING DEVICES COMPRISING FILTERING MEANS IN ITS INPUT FOR SELECTING A GIVEN BAND OF FREQUENCIES FROM THE INPUT WAVES APPLIED TO ITS INPUT TERMINALS, MEANS FOR PRODUCING FROM THE SELECTED BAND TWO CONTIGUOUS FREQUENCY BANDS EACH CARRYING THE INTELLIGENCE OF THE SELECTED BAND AND VARYING IN FREQUENCY IN ACCORDANCE WITH A PREDETERMINED SECRET CODE, SYNCHRONIZED AT THE TWO STATIONS, MEANS FOR SELECTING FROM THE RESULTING WAVE A FREQUENCY BAND OF WIDTH EQUAL TO THAT OF SAID SELECTED BAND INCLUDING CONTIGUOUS PORTIONS OF SAID TWO CONTIGUOUS FREQUENCY BANDS, MEANS TO SHIFT THE LATTER SELECTED BAND TO THE SAME POSITION IN THE FREQUENCY SPECTRUM AS THE FIRST SELECTED BAND AND TO SUPPLY THE FREQUENCY BAND SO SHIFTED TO THE OUTPUT TERMINALS OF THE DEVICE.