Amplifier control system

Claim 1

A CONTROL CIRCUIT FOR PARAMETRIC DEVICES COMPRISING: (1) A PARAMETRIC DEVICE HAVING A GIVEN GAIN INCLUDING (A) A STABLE OSCILLATOR, (B) A VARIABLE ATTENUATOR COUPLED TO THE OUTPUT OF SAID OSCILLATOR, AND (C) A VARIABLE REACTANCE CIRCUIT COUPLED TO THE OUTPUT OF SAID VARIABLE ATTENUATOR HAVING A SIGNAL INPUT MEANS AND A SIGNAL OUTPUT MEANS; (2) A SOURCE OF INTELIGENCE SIGNALS COUPLED TO SAID INPUT MEANS FOR AMPLIFICATION OF THE SIGNAL THEREOF IN SAID DEVICE; (3) MEANS COUPLED TO SAID OUTPUT MEANS TO REMOVE AMPLIFIED SIGNALS OF SAID SOURCE OF INTELLIGENCE SIGNALS THEREFROM; (4) A SIGNAL GENERATOR COUPLED TO SAID INPUT MEANS TO GENERATE SIGNALS HAVING A PREDETERMINED FREQUENCY; (5) MODULATOR MEANS COUPLED TO SAID SIGNAL GENERATOR TO MODULATE THE SIGNALS OF SAID GENERATOR; (6) A FIRST DETECTOR COUPLED TO SAID INPUT MEANS TO DETECT THE ENVELOPE OF THE MODULATED SIGNAL OF SAID GENERATOR AT SAID INPUT MEANS; (7) A SECOND DETECTOR COUPLED TO SAID OUTPUT MEANS TO DETECT THE ENVELOPE OF THE MODULATED SIGNAL OF SAID GENERATOR AT SAID OUTPUT MEANS; (8) AN ATTENUATOR COUPLED TO SAID SECOND DETECTOR TO ATTENUATE THE OUTPUT SIGNALS THEREFROM BY AN AMOUNT EQUAL TO SAID GIVEN GAIN; (9) A COMPARISON CIRCUIT COUPLED IN COMMON TO THE OUTPUT OF SAID FIRST DETECTOR AND THE OUTPUT OF SAID ATTENUATOR TO COMPARE THE AMPLITUDE OF THE OUTPUT SIGNALS THEREFROM TO PRODUCE A CONTROL SIGNAL PROPORTIONAL TO VARIATIONS IN SAID GIVEN GAIN; AND (10) MEANS TO COUPLE SAID CONTROL SIGNAL TO SAID VARIABLE ATTENUATOR TO VARY THE POWER OF THE OUTPUT SIGNAL OF SAID STABLE OSCILLATOR IN ACCORDANCE WITH SAID CONTROL SIGNAL TO COMPENSATE FOR SAID VARIATIONS IN SAID GIVEN GAIN.