Distortion reducing modulator

Claim 1

A MODULATOR CIRCUIT INCLUDING A FIRST AND A SECOND MODULATING DEVICE, EACH OF SAID MODULATING DEVICES BEING SUCH THAT THE IMPEDANCE PRESENTED BY SAID MODULATOR TO AN APPLIED MODULATING SIGNAL CHANGES SUBSTANTIALLY IN CORRESPONDENCE WITH THE MAGNITUDE OF THE APPLIED MODULATING SIGNAL, A SOURCE OF MODULATING SIGNAL INCLUDING A FIRST SIGNAL COMPONENT OF VARYING AMPLITUDE AND A SECOND COMPONENT COMPRISING A SUB-CARRIER OSCILLATION THE PHASE OF WHICH IS SIGNIFICANT ADDITIVELY COMBINED THEREWITH, A SOURCE OF CARRIER SIGNAL, CARRIER FEEDING MEANS FOR APPLYING SAID CARRIER SIGNAL TO SAID MODULATING DEVICES, MODULATING SIGNAL FEEDING MEANS FOR FEEDING SAID MODULATING SIGNAL TO SAID MODULATING DEVICES SO THAT THE RESPECTIVE CARRIER FREQUENCY OUTPUTS ARE AMPLITUDE MODULATED THEREBY IN ANTI-PHASE, OUTPUT CIRCUIT MEANS, OUTPUT CIRCUIT FEEDING MEANS FOR FEEDING THE MODULATED CARRIER OUTPUTS OF SAID RESPECTIVE MODULATORS TO SAID OUTPUT CIRCUIT IN WHICH SAID MODULATED CARRIER OUTPUT OSCILLATIONS ARE ADDED IN ANTIPHASE RELATIONSHIP TO PROVIDE AN UNBALANCED CARRIER MODULATION, AND CONTROL MEANS FOR CONTROLLING THE RELATIVE AMPLITUDES OF SAID MODULATING SIGNALS FED TO SAID MODULATING DEVICES, SAID CONTROL MEANS BEING ADJUSTED SO THAT THERE IS SUBSTANTIALLY CANCELLATION IN SAID OUTPUT CIRCUIT OF THE DIFFERENTIAL PHASE SHIFT OF THE MODULATED SUB-CARRIER OSCILLATION COMPONENTS OF THE OUTPUTS OF THE RESPECTIVE MODULATING DEVICES.