Squelch circuit with discriminator loading such that noise voltage is not passed by interelectrode capacitance of audio section

Claim 1

MEANS FOR LOADING THE AUDIO CHANNEL OF THE DETECTOR SECTION OF A RADIO RECEIVER WHEN THE RECEIVER IS MUTED BY A SQUELCH CONTROL MEANS SO AS TO PREVENT NOISE SIGNAL VOLTAGE FROM BEING APPLIED THROUGH THE INTERELECTRODE CAPACITANCE BETWEEN THE INPUT AND OUTPUT OF THE AUDIO AMPLIFIER SECTION TO A LOAD AND COMPRISING A DETECTOR HAVING AN INPUT AND AN OUTPUT, THE OUTPUT OF THE DETECTOR INCLUDING AN AUDIO CHANNEL AND A SQUELCH CHANNEL, MEANS FOR APPLYING AUDIO MODULATED INPUT SIGNALS TO THE INPUT OF THE DETECTOR WHICH IS OPERATIVE TO DEMODULATE THE INPUT SIGNALS AND TO DEVELOP OUTPUT SIGNAL VOLTAGE INCLUDING NOISE SIGNAL VOLTAGE AND AUDIO SIGNAL VOLTAGE, AN AUDIO AMPLIFIER ELECTRONIC CONTROL DEVICE HAVING AN INPUT AND AN OUTPUT WITH INTERELECTRODE CAPACITANCE PRESENT THEREBETWEEN, THE AUDIO CHANNEL OUTPUT OF THE DETECTOR CONNECTED WITH THE INPUT OF THE CONTROL DEVICE, SQUELCH CONTROL MEANS HAVING AN INPUT AND AN OUTPUT CONNECTED WITH THE SQUELCH CHANNEL OUTPUT OF THE DETECTOR AND THE INPUT OF THE CONTROL DEVICE, RESPECTIVELY, A LOAD CONNECTED ACROSS THE OUTPUT OF THE CONTROL DEVICE, A CONTROLLABLE IMPEDANCE PATH TO THE OUTPUT SIGNAL VOLTAGE CONNECTED ACROSS THE INPUT OF THE CONTROL DEVICE WHEREBY WHEN THE MAGNITUDE OF THE NOISE SIGNAL VOLTAGE EXCEEDS A PREDETERMINED VALUE THE SQUELCH CONTROL MEANS IS OPERATIVE TO APPLY SUFFICIENT CUT-OFF POTENTIAL TO THE INPUT OF THE CONTROL DEVICE TO MUTE THE RECEIVER SO THAT THE CONTROLLABLE IMPEDANCE PATH LOADS THE AUDIO CHANNEL OF THE DETECTOR TO PREVENT NOISE SIGNAL VOLTAGE FROM BEING APPLIED THROUGH THE INTERELECTRODE CAPACITANCE BETWEEN THE INPUT AND OUTPUT OF THE CONTROL DEVICE TO THE LOAD, AND MEANS CONNECTED WITH THE CONTROLLABLE IMPEDANCE PATH FOR DEACTIVATING THE PATH WHEN THE MAGNITUDE OF NOISE SIGNAL VOLTAGE DECREASES BELOW A PREDETERMINED VALUE.