Independent sideband transmission system

Claim 1

A COMMUNICATION TRANSMISSION SYSTEM FOR THE SIMULTANEOUS TRANSMISSION OF TWO INDEPENDENT SIDEBANDS OF A COMMON CARRIER WHICH COMPRISES: (A) A PAIR OF IDENTICAL CHANNELS EACH HAVING CONNECTED IN SERIES THEREIN: (1) MEANS FOR LIMITING THE AMPLITUDE AND FREQUENCY BANDWIDTH OF AN INPUT SIGNAL, (2) A DOUBLE BALANCED MODULATOR, (3) AN UPPER PASSBAND FILTER, (4) A BALANCED MODULATOR, (B) A SOURCE OF AUDIO FREQUENCY OSCILLATIONS CONNECTED TO BOTH OF SAID DOUBLE BALANCED MODULATORS FOR PRODUCING THEREFROM A LOWER AND UPPER SIDEBAND SIGNAL DEVOID OF SAID AUDIO FREQUENCY, (C) A FIRST SOURCE OF OSCILLATION OF A FREQUENCY ABOVE THE AUDIO SPECTRUM CONNECTED TO ONE OF SAID BALANCED MODULATORS FOR PRODUCING THEREFROM A LOWER AND UPPER SIDEBAND OUTPUT, (D) MEANS CONNECTED TO SAID ONE OF SAID BALANCED MODULATORS FOR FILTERING AND REMOVING FROM THE OUTPUT THEREOF SAID UPPER SIDEBAND, (E) A SECOND SOURCE OF OSCILLATIONS OF A FREQUENCY ABOVE THE AUDIO SPECTRUM DIFFERING IN FREQUENCY FROM SAID FIRST SOURCE AND CONNECTED TO THE OTHER OF SAID BALANCED MODULATORS FOR PRODUCING THEREFROM A LOWER AND UPPER SIDEBAND OUTPUT, (F) MEANS CONNECTED TO SAID OTHER BALANCED MODULATOR FOR FILTERING AND REMOVING FROM THE OUTPUT THEREOF SAID LOWER SIDEBAND, (G) LINEAR SUMMING MEANS CONNECTED TO RECEIVE THE OUTPUT OF BOTH SAID MEANS FOR FILTERING FOR COMBINING THE SAME, (H) TRANSMISSION MEANS CONNECTED TO SAID SUMMING ELECTROMAGNETIC ENERGY, (I) WHEREBY WHEN TWO DISTINCT AND SEPARATE INTELLIGENCE SIGNALS ARE APPLIED TO SAID MEANS FOR LIMITING SAID INTELLIGENCE SIGNALS WILL BE RADIATED AS TWO INDEPENDENT SIDEBANDS.