Phase coincidence detector control circuit

Claim 1

A COINCIDENCE DETECTOR CIRCUIT FOR CONTROLLING DISPLAY APPARATUS AS A FUNCTION OF PHASE COINCIDENCE COMPRISING A PAIR OF TRANSISTOR ELEMENTS, EACH OF SAID TRANSISTOR ELEMENTS COMPRISING AN EMITTER ELECTRODE, A BASE ELECTRODE, AND A COLLECTOR ELECTRODE, MEANS FOR APPLYING PULSE SIGNALS OF SELECTED FREQUENCY TO THE BASE ELECTRODE OF ONE OF SAID TRANSISTOR ELEMENTS, MEANS FOR APPLYING OTHER PULSE SIGNALS OF SUBSTANTIALLY LIKE FREQUENCY BUT SUBJECT TO PHASE SHIFT TO THE BASE ELECTRODE OF THE OTHER TRANSISTOR ELEMENT, AN OUTPUT CIRCUIT FOR EACH OF SAID TRANSISTOR ELEMENTS, INCLUDING AN INDUCTIVE ELEMENT, A SIGNAL COMBINING CIRCUIT FORMING AN "AND" CIRCUIT CONNECTED TO RECEIVE THE SIGNAL OUTPUTS DEVELOPED FROM EACH TRANSISTOR ELEMENT ACROSS THE INDUCTIVE ELEMENTS, A THIRD TRANSISTOR ELEMENT HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE, MEANS FOR CONNECTING THE BASE ELECTRODE THEREOF TO RECEIVE THE COMBINED OUTPUT FROM THE FIRST TWO TRANSISTOR ELEMENTS, A LOAD CIRCUIT CONNECTED TO THE EMITTER ELECTRODE OF SAID THIRD TRANSISTOR ELEMENT, AND A DAMPING UNILATERAL CONDUCTOR CONNECTED INJ SHUNT WITH EACH INDUCTIVE ELEMENT WHEREBY INTERRUPTIONS OF PULSE INPUTS TO EACH OF THE FIRST PAIR OF TRANSISTOR ELEMENTS INTRODUCES A RINGING IN THE INDUCTIVE ELEMENT WHICH IS DAMPENED BY THE UNILATERAL CONDUCTOR AND A PULSE INPUT IS SUPPLIED TO THE THIRD TRANSISTOR ELEMENT DURING PERIODS OF COINCIDENCE OF OUTPUTS OF EACH OF THE FIRST PAIR OF TRANSISTOR ELEMENTS.