Electronic acoustic receiver

Claim 1

A CODE OPERATED ELECTRONIC ACOUSTIC RECEIVER COMPRISING: (A) AN ACOUSTIC TRANSDUCER TO PRODUCE ELECTRIC SIGNALS IN RESPONSE TO ACOUSTIC SIGNALS; (B) AN AMPLIFIER CIRCUIT, MEANS FOR CONDUCTIVELY CONNECTING SAID AMPLIFIER CIRCUIT TO SAID TRANSDUCER TO RECEIVE SAID ELECTRIC SIGNALS, MEANS IN SAID AMPLIFIER FOR PRODUCING AN AMPLIFIER OUTPUT INCLUDING TIMESTANDARDIZED AMPLIFIER PULSES GENERATED IN SAID AMPLIFIER IN RESPONSE TO SAID ELECTRIC SIGNALS; (C) AN AUTOMATIC LOCKOUT IN SAID AMPLIFIER CIRCUIT TO PREVENT SAID AMPLIFIER FROM RECEIVING ELECTRIC SIGNALS FROM SAID TRANSDUCER DURING A PREDETERMINED LOCKOUT TIME INTERVAL SUBSEQUENT TO THE RECEIPT OF A FIRST ELECTRIC SIGNAL; (D) A TIME-DELAY CIRCUIT, MEANS FOR CONDUCTIVELY CONNECTING SAID TIME-DELAY CIRCUIT WITH SAID AMPLIFIER CIRCUIT TO RECEIVE A FIRST STANDARDIZED AMPLIFIER PULSE GENERATED IN SAID AMPLIFIER IN RESPONSE TO A FIRST CODED ACOUSTIC SIGNAL, MEANS IN SAID TIME-DELAY CIRCUIT FOR PRODUCING IN RESPONSE TO SAID FIRST STANDARDIZED AMPLIFIER PULSE A PROLONGED TIME-DELAY PULSE OF STANDARD DURATION WHICH SURVIVES SAID LOCKOUT TIME INTERVAL FOR A SHORT TIME; (E) A GATING CIRCUIT, MEANS FOR CONDUCTIVELY CONNECTING SAID GATING CIRCUIT TO SAID TIME-DELAY CIRCUIT TO RECEIVE SAID PROLONGED TIME-DELAY PULSE THEREFROM, MEANS IN SAID GATING CIRCUIT TO DIFFERENTIATE SAID PROLONGED PULSE, AND TO PRODUCE A DIFFERENTIAL PULSE IN RESPONSE TO THE EXPIRATION OF SAID TIME-DELAY PULSE, MEANS FOR CONDUCTIVELY CONNECTING SAID GATING CIRCUIT TO SAID AMPLIFIER CIRCUIT TO RECEIVE A SECOND AMPLIFIER PULSE GENERATED IN SAID AMPLIFIER IN RESPONSE TO A SECOND ACOUSTIC SIGNAL TRANSMITTED TO SAID TRANSDUCER IN CODED RELATIONSHIP WITH SAID FIRST ACOUSTIC SIGNAL, MEANS FOR CONVERTING SAID AMPLIFIER PULSE TO A GATE PULSE, SAID CODE RELATIONSHIP BEING AN INTERVAL OF TIME SEPARATION BETWEEN SAID ACOUSTIC SIGNALS WHICH CAUSES THE PRESENCE OF SAID GATE PULSE IN SAID GATING CIRCDIT TO COINCIDE WITH THE PRODUCTION OF SAID DIFFERENTIAL PULSE, AND MEANS IN SAID GATING CIRCUIT FOR PRODUCING OUTPUT PULSES ONLY IN RESPONSE TO THE COINCIDENT PRESENCE THEREIN OF SAID DIFFERENTIAL AND GATE PULSES; (F) AN OUTPUT CIRCUIT INCLUDING A LOAD DEVICE, POWER SUPPLY MEANS FOR SAID LOAD DEVICE, MEANS FOR CONNECTING SAID OUTPUT CIRCUIT TO SAID GATING CIRCUIT, AND MEANS RESPONSIVE TO SAID OUTPUT PULSE FOR CONNECTING SAID LOAD DEVICE WITH SAID POWER SUPPLY; WHEREBY SAID FIRST AND SECOND CODED ACOUSTIC SIGNAL ARE EFFECTIVE TO OPERATE SAID LOAD DEVICE