Signal amplitude derivation from coincidence information

Claim 1

A SIGNAL RECEIVING SYSTEM COMPRISING: A PAIR OF TRANSDUCER MEANS FOR RECEIVING AMPLITUDE MODULATED SIGNAL WAVES ACCOMPANIED BY NOISE SIGNAL WAVES; A PAIR OF RECEIVER MEANS RESPECTIVELY CONNECTED TO THE OUTPUTS OF SAID PAIR OF TRANSDUCER MEANS FOR AMPLIFYING AND FULLY LIMITING SAID AMPLITUDE MODULATED SIGNAL WAVES AND SAID NOISE SIGNAL WAVES IN SUCH MANNER AS TO EFFECT CONVERSION THEREOF INTO PULSES HAVING UNIFORM WIDTH AND AMPLITUDE; MEANS CONNECTED TO THE OUTPUTS OF SAID PAIR OF RECEIVING MEANS FOR PROVIDING A COINCIDENCE OUTPUT PULSE ONLY WHEN THE PULSES FROM SAID RECEIVING MEANS COINCIDE IN TIME; DETECTOR MEANS CONNECTED TO THE OUTPUT OF SAID COINCIDENCE OUTPUT PULSE PROVIDING MEANS FOR PRODUCING A SIGNAL HAVING A LEVEL PROPORTIONAL TO THE DENSITY OF THE COINCIDENCE OUTPUT PULSES THEREFROM, SAID MEANS INCLUDING A CAPACITOR EFFECTIVELY CONNECTED TO THE OUTPUT OF SAID COINCIDENCE OUTPUT PULSE PROVIDING MEANS FOR BEING CHARGE VARIED IN ONE SENSE A FIXED INCREMENT BY EACH OF SAID COINCIDENCE OUTPUT PULSES, AND TIMING MEANS CONNECTED TO SAID CAPACITOR FOR PERIODICALLY VARYING IN ANOTHER SENSE THE CHARGE THEREON; MEANS CONNECTED TO THE OUTPUTS OF SAID PAIR OF RECEIVING MEANS FOR PRODUCING A TIMING PULSE WHENEVER THE OUTPUT PULSES THEREFROM DO NOT COINCIDE IN TIME; AND MEANS CONNECTED BETWEEN THE OUTPUT OF SAID TIMING PULSE PRODUCING MEANS AND AN INPUT OF THE AFORESAID DETECTOR MEANS FOR VARYING THE PERIODICITY OF THE TIMING PULSES FROM SAID TIMING PULSE PRODUCING MEANS IN RESPONSE TO THE ONES THEREOF HAVING A PRESELECTED MINIMUM AMPLITUDE.