Electronic signal gating system with gates operated in response to changes in the signal being gated

Claim 1

A GATING SYSTEM FOR SELECTIVELY COUPLING RF INPUT SIGNALS FROM A PLURALITY OF INPUT CHANNELS TO AN OUTPUT TERMINAL, COMPRISING: A PLURALITY OF GATES, ONE COUPLED BETWEEN THE END OF EACH INPUT CHANNEL AND THE OUTPUT TERMINAL AND MEANS FOR PRODUCING CONTROL SIGNALS FOR THE GATES IN RESPONSE TO THE PRESENCE OF SAID INPUT SIGNALS IN THE RESPECTIVE INPUT CHANNELS, SAID CONTROL SIGNAL PRODUCING MEANS INCLUDING AN RF SMOOTHING FILTER COUPLED TO EACH INPUT CHANNEL TO FORM UNIDIRECTIONAL PULSES HAVING DURATIONS SUBSTANTIALLY EQUAL TO THOSE OF SAID RF INPUT SIGNALS RESPONSIVE TO THE PRESENCE THEREOF IN THE CORRESPONDING CHANNEL, DIFFERENTIATING MEANS COUPLED TO EACH RF SMOOTHING FILTER FOR GENERATING TRIGGER PULSES IN TIME CORRESPONDENCE WITH AND RESPONSIVE TO A PREDETERMINED ONE OF THE EDGES OF SAID UNIDIRECTIONAL PULSES, AND A BISTABLE MULTIVIBRATOR OPERATIVELY COUPLED TO SWITCH IN RESPONSE TO THE TRIGGER PULSES OF THE RESPECTIVE DIFFERENTIATING MEANS AND GENERATE FIRST AND SECOND OPPOSITELY PHASED OUTPUTS INITIATED IN RESPONSE TO THE TRIGGER PULSES OF ONE DIFFERENTIATING MEANS AND TERMINATED IN RESPONSE TO THE TRIGGER PULSES OF THE OTHER DIFFERENTIATING MEANS, SAID MULTIVIBRATOR OUTPUTS RESPECTIVELY COUPLED IN GATING RELATION TO SAID GATES.