Differential frequency rate system for providing a pulse train output corresponding to the frequency difference between two input pulse trains

Claim 1

A DIFFERENTIAL RATE SYSTEM HAVING FIRST AND SECOND SETS OF PULSED WAVEFORM SIGNALS APPLIED TO THE INPUT THEREOF FOR DERIVING AN OUTPUT SIGNAL REPRESENTATIVE OF THE DIFFERENCE IN FREQUENCY OF THE TWO SETS OF PULSED INPUT SIGNALS, THE IMPROVEMENT COMPRISING MAIN GATE MEANS HAVING INPUT, OUTPUT AND CONTROL TERMINALS, GATE CONTROL MEANS COUPLED TO CONROL TERMINAL OF SAID MAIN GATE MEANS FOR TURNING OFF THE MAIN GATE MEANS FOR A PREDETERMINED TIME INTERVAL IN THE PRESENCE OF AN ENERGIZING MAIN GATE TURN-OFF SIGNAL TO THE GATE CONTROL MEANS, DELAY MEANS HAVING ITS OUTPUT OPERATIVELY COUPLED TO THE INPUT OF SAID MAIN GATE MEANS AND HAVING ITS INPUT OPERATIVELY COUPLED TO THE FIRST SET OF PULSED WAVEFORM INPUT SIGNALS, MEMORY MEANS HAVING TWO STABLE STATES OF OPERATION AND HAVING AN INPUT OPERATIVELY COUPLED TO AND CONTROLLED BY THE SECOND SET OF PULSED WAVEFORM INPUT SIGNALS AND ITS OUTPUT OPERATIVELY CONTROLLING ENERGIZATION OF SAID GATE CONTROL MEANS, SAID MEMORY MEANS BEING SWITCHED TO A FIRST STABLE STATE OF OPERATION THEREBY SWITCHED TO A TION OF SAID GATE CONTROL MEANS UPON OCCURRENCE OF A SECOND SIGNAL PULSE, AND MEANS FOR RESETTING SAID MEMORY MEANS TO ITS SECOND STABLE STATE UPON THE OCCURRENCE OF THE NEXT SUCCEEDING FIRST SIGNAL PULSE, SAID MEMORY MEANS IN ITS SECOND STABLE STATE ALLOWING TRANSMISSION OF SIGNAL PULSES THROUGH THE DELAY MEANS AND THE MAIN GATE MEANS TO THE OUTPUT THEREOF.