Pulse duration modulator

Claim 1

A TIME SYNCHRONIZED PULSE DURATION MODULATOR COMPRISING A SATURABLE CORE HAVING SUBSTANTIALLY SQUARE HYSTERESIS LOOP CHARACTERISTICS, AN INPUT WINDING ON SAID CORE AND A VOLTAGE CONTROLLED SWITCH MEANS, MEANS APPLYING AN INPUT SIGNAL OF TIME VARYING AMPLITUDE TO SAID INPUT WINDING AND THROUGH SAID SWITCH MEANS WHEREBY SAID INPUT SIGNAL IS APPLIED TO SAID INPUT WINDING WHEN THE SWITCH MEANS IS CLOSED, REPETITIVELY OPERATING MEANS FOR CYCLICALLY ENERGIZING SAID SWITCH MEANS TO CLOSE FOR FIXED TIME INTERVALS THEREBY TO PARTIALLY SATURATE THE CORE DURING EACH SAID TIME INTERVAL IN PROPORTION TO THE AMPLITUDE OF THE TIME VARIABLE INPUT SIGNAL, SECOND ENERGIZING MEANS REPETITIVELY OPERABLE IN RESPONSE TO AND AFTER THE TERMINATION OF EACH OF SAID FIXED TIME INTERVALS TO RESET THE CORE TO ITS INITIAL STATE OF SATURATION BY APPLYING THERETO AN IMPULSE OF CONSTANT AMPLITUDE AND RELATIVELY LONG DURATION, AND AN OUTPUT WINDING ON SAID CORE FOR PRODUCING A SERIES OF CONSTANT AMPLITUDE OUTPUT PULSES DURING THE APPLICATION OF EACH OF SAID RESET PULSES WITH EACH PULSE AND HAVING A TIME DURATION PROPORTIONAL TO THE AMPLITUDE OF SAID APPLIED INPUT SIGNAL DURING THE PREVIOUSLY APPLIED FIXED TIME INTERVAL, SAID SWITCH MEANS INCLUDING A TRANSISTOR AND SAID FIRST ENERGIZING MEANS INCLUDING A MAGNETIC PULSE FORMER PRODUCING A FIXED WAVEFORM IMPULSE, SAID MEANS FOR APPLYING THE INPUT PULSE TO SAID INPUT WINDING INCLUDING A THERMISTOR FOR COMPENSATING FOR THE CHANGE IN CHARACTERISTICS OF THE MODULATOR WITH TEMPERATURE VARIATION.