Control for noise squelch circuit

Claim 1

IN A RADIO RECEIVER INCLUDING AN ACTIVE AUDIO OUTPUT STAGE, NOISE SQUELCH MEANS FOR MAINTAINING SAID AUDIO STAGE SUBSTANTIALLY AT CUTOFF DURING THE QUIESCENT STATE OF SAID RECEIVER, A SOURCE OF UNIDIRECTIONAL POTENTIAL HAVING A POSITIVE AND A NEGATIVE TERMINAL IN CIRCUIT WITH SAID NOISE SQUELCH MEANS AND SAID AUDIO STAGE, ONE OF SAID TERMINALS BEING AT GROUND POTENTIAL, AND MEANS IN CIRCUIT WITH SAID NOISE SQUELCH MEANS, SAID AUDIO STAGE, AND SAID SOURCE FOR AUTOMATICALLY SELECTIVELY DISABLING SAID NOISE SQUELCH MEANS OR ENABLING SAID AUDIO STAGE IN RESPONSE TO THE RECEPTION OF A CHOSEN ELECTRICAL SIGNAL, SAID LAST NAMED MEANS INCLUDING MEANS FOR ACTIVATING SAID NOISE; SQUELCH MEANS IN THE ABSENCE OF SAID CHOSEN SIGNAL TO MAINTAIN SAID RECEIVER QUIESENT WHENEVER ONE OF SAID TERMINALS IS AT GROUND POTENTIAL, AND MEANS FOR DIRECTLY DISABLING SAID AUDIO STAGE IN THE ABSENCE OF SAID CHOSEN SIGNAL WHEN THE OTHER OF SAID TERMINALS IS AT GROUND POTENIAL, MEANS TO DISABLE SAID MEANS FOR ACTIVATING AND SAID MEANS FOR DISABLING UPON RECEIPT OF SAID CHOSEN SIGNAL TO CONDITION SAID INPUT RECEIVER FOR REPRODUCTION OF A TRANSMITTED SIGNAL.