Multifrequency signal receiver

Claim 1

A SIGNAL RECEIVER FOR CONVERTING PAIRS OF SUBSTANTIALLY SIMULTANEOUS MULTIFREQUENCY INPUT SIGNALS INTO D.-C. OUTPUT SIGNALS COMPRISING, IN COMBINATION, A FIRST NETWORK FOR INPUT SIGNALS WITHIN A FIRST PRESELECTED BAND OF FREQUENCIES; A SECOND NETWORK FOR INPUT SIGNALS WITHIN A SECOND PRESELECTED BAND OF FREQUENCIES; EACH OF SAID NETWORKS COMPRISING A RESPECTIVE PLURALITY OF SIGNAL PATHS; EACH OF SAID PATHS INCLUDING A RESPECTIVE TUNED CIRCUIT RESONANT AT A RESPECTIVE PRESELECTED FREQUENCY, A RESPECTIVE ONE OF A PLURALITY OF DETECTOR CIRCUITS AND A RESPECTIVE OUTPUT POINT, MEANS RESPONSIVE TO A COINCIDENCE OF PREASSIGNED DURATION BETWEEN AN OUTPUT FROM ONE OF SAID DETECTORS IN EACH OF SAID NETWORKS FOR GENERATING A TRIGGERING SIGNAL; MEANS RESPONSIVE TO SAID TRIGGERING SIGNAL FOR GENERATING A TIMING SIGNAL HAVING A PRESELECTED DURATION; MEANS IN EACH OF SAID PATHS JOINTLY RESPONSIVE TO SAID TIMING SIGNAL AND TO A SIGNAL FROM A RESPECTIVE ONE OF SAID DETECTOR CIRCUITS FOR APPLYING AN OUTPUT SIGNAL TO A CORRESPONDING ONE OF SAID OUTPUT POINTS; MEANS IN EACH OF SAID SIGNAL PATHS FOR APPLYING A PART OF SAID OUTPUT SIGNAL FROM A RESPECTIVE ONE OF SAID OUTPUT POINTS TO THE INPUT OF A CORRESPONDING ONE OF SAID DETECTORS, WHEREBY, FOR EACH OF SAID INPUT SIGNAL PAIRS, A D.-C. OUTPUT SIGNAL HAVING A DURATION EQUAL TO SAID TIMING SIGNAL, IRRESPECTIVE OF THE DURATION OF SAID INPUT SIGNAL, IS APPLIED TO A RESPECTIVE ONE OF SAID OUTPUT POINTS IN EACH OF SAID NETWORKS.