Sweep and function generator employing difference amplifier controlling varaible reactor

Claim 1

A SWEEP AND FUNCTION GENERATOR FOR DEVELOPING SIGNALS OF VARYING WAVE SHAPE AT A FIRST FREQUENCY, FROM A SOURCE OF ALTERNATING CURRENT HAVING A SECOND FREQUENCY HIGHER THAN THE FIRST FREQUENCY, COMPRISING: MEANS, INCLUDING A VARIABLE REACTOR HAVING A CONTROL WINDING, COUPLED TO SAID SOURCE FOR PROVIDING A THIRD ALTERNATING CURRENT SIGNAL OF VARYING MAGNITUDE; RECTIFIER MEANS COUPLED TO THE VARIABLE REACTOR FOR DEVELOPING A DIRECT CURRENT POTENTIAL WHOSE MAGNITUDE VARIES AS THE MAGNITUDE OF THE ALTERNATING CURRENT COUPLED THEREOF; FILTER MEANS COUPLED TO SAID RECTIFIER MEANS, HAVING A PASS BAND CHARACTERISTIC FOR FILTERING SIGNALS AT THE SECOND FREQUENCY AND PASSING TO OUTPUT TERMINALS SIGNALS AT THE FIRST FREQUENCY; MEANS, INCLUDING A FUNCTION GENERATOR, FOR DEVELOPING A VARYING CONTROL VOLTAGE; MEANS, INCLUDING A SOURCE OF CONSTANT CURRENT COUPLED TO A DIFFERENCE AMPLIFIER HAVING A FIRST INPUT COUPLED TO SAID FILTER MEANS AND A SECOND INPUT COUPLED TO SAID FUNCTION GENERATOR, COUPLED TO SAID CONTROL WINDING FOR CAUSING SAID THIRD SIGNAL TO VARY IN MAGNITUDE IN RESPONSE TO VARIATIONS IN SAID FUNCTION GENERATOR CONTROL VOLTAGE, SAID THIRD SIGNAL BEING RECTIFIED AND FILTERED IN SAID RECTIFIER AND FILTER MEANS TO DEVELOP AT SAID OUTPUT TERMINALS SIGNALS OF VARYING WAVE SHAPE AT SAID FIRST FREQUENCY, HAVING A WAVEFORM IDENTICAL TO SAID VARYING CONTROL VOLTAGE FROM SAID FUNCTION GENERATOR.