Pulse selecting circuit

Claim 1

A PULSE SELECTION CIRCUIT FOR SELECTING A PERIODIC PULSE GROUP HAVING A PREDETERMINED PULSE REPETITION RATE FROM THE PULSES OF A SERIES OF RANDOM PULSE TRAINS CONTAINING SAID PERIODIC PULSE GROUP COMPRISING: AN EXTERNALLY SYNCHRONIZED FREE RUNNING OSCILLATOR HAVING A PULSE REPETITION RATE EQUAL TO THAT OF SAID PERIODIC PULSE GROUP MEANS FOR TRIGGERING SAID OSCILLATOR WITH THE PULSES OF SAID RANDOM PULSES DURING THE PERIOD DETERMINED BY SAID PREDETERLATOR, ONCE TRIGGERED, BEING INSENSITIVE TO SUBSEQUENT RANDOM PULSES DURING THE PERIOD DETERMINED BY SAID PREDETERMINED REPETITION RATE; A GATING CIRCUIT HAVING AN INHIBITING INPUT AND A NORMALLY-THROUGH INPUT; A NEGATIVE FEEDBACK PATH FROM THE OUTPUT OF SAID OSCILLATOR THROUGH SAID NORMALLY-THROUGH INPUT OF SAID GATING CIRCUIT TO THE INPUT OF SAID OSCILLATOR FOR INHIBITING THE TRIGGERING OF SAID OSCILLATOR IN THE ABSENCE OF A SIGNAL ON SAID INHIBITING INPUT OF SAID GATING CIRCUIT; AND MEANS FOR APPLYING THE PULSES OF SAID RANDOM PULSE TRAINS TO SAID INHIBITING INPUT OF SAID GATING CIRCUIT; WHEREBY WHEN THE PULSES OF SAID PULSE TRAINS ARE COINCIDENT WITH SAID OSCILLATOR OUTPUT PULSES SAID NEGATIVE FEEDBACK CIRCUIT IS WITHOUT EFFECT.