Digital frequency selector

Claim 1

IN A SYSTEM FOR COUNTING INCOMING PULSES RECEIVED OVER AN INPUT CIRCUIT AND FOR ISSUING OVER AN OUTPUT CIRCUIT A SINGLE PULSE RESPONSIVE TO THE ACCUMULATION OF A PRESET TOTAL OF THE INCOMING PULSES, THE COMBINATION OF: A COUNTER, INCLUDING A PLURALITY OF DIGIT COUNTING CIRCUITS, OPERATIVE TO ACCUMULATE SAID INCOMING PULSES; A SELECTOR SWITCHING ARRANGEMENT OPERATIVE RESPONSIVE TO THE RECEIPT OF INFORMATION DENOTING A DESIRED COUNT TO APPLY TO SAID DIGIT COUNTING CIRCUITS COMPLEMENTARY INFORMATION DENOTING A NUMBER WHICH IS THE NINES COMPLEMENT OF THE DESIRED COUNT; CIRCUIT MEANS INCLUDING A GATE CIRCUIT FOR ISSUING A SINGLE TIMING PULSE RESPONSIVE TO THE ACCUMULATION IN SAID COUNTER OF A TOTAL EQUAL TO THE FULL COUNT OF SAID COUNTER, AND A PULSE GENERATOR CIRCUIT COUPLED IN SERIES WITH SAID GATE CIRCUIT FOR PRODUCING AN OUTPUT PULSE DELAYED RELATIVE TO SAID TIMING PULSE BY A TIME PERIOD DURING WHICH AT LEAST ONE INCOMING PULSE IS RECEIVED OVER SAID INPUT CIRCUIT TO PROVIDE TRUE COMPLEMENTARY OPERATION; AND CIRCUIT MEANS FOR EFFECTING RESET OF THE COUNTER RESPONSIVE TO THE ISSUING OF SAID OUTPUT PULSE FROM SAID PULSE GENERATOR CIRCUIT.