Superregenerative receiver with automatic squelch

Claim 1

A RADIO RECEIVING SDYSTEM COMPRISING A SUPPERREGENERATIVE DETECTOR ADAPTED TO RECEIVE AN EXTERNAL SIGNAL AND GENERATE OUTPUT AUDIO AND QUENCH FREQUENCY SIGNALS; AN AUDIO STAGE, SAID AUDIO STAGE INCLUDING AN ACTIVE ELEMENT FOR FIRST AMPLIFYING THE AUDIO SIGNAL AND WHICH ELEMENT HAS A CONTROL ELECTRODE FOR CONTROLLING FLOW OF SIGNAL THROUGH SAID ACTIVE ELEMENT; A SERIES-CONNECTED CAPACITOR AND INDUCTOR SERVING AS A COMBINED FREQUENCY DISCRIMINATOR AND QUENCH VOLTAGE AMPLIFIER CONNECTED TO RECEIVE THE OUTPUT QUENCH SIGNAL OF SAID SUPERREGENERATIVE DETECTOR, THE SERIESCONNECTED CAPACITOR AND INDUCTOR HAVING A RESONANT FREQUENCY WHICH IS DIFFERENT FROM THE FREQUENCY OF THE QUENCH SIGNAL; MEANS FOR RECTIFYING AND SMOOTHING THE AMPLIFIED QUENCH SIGNAL FROM THE SERIES-CONNECTED CAPACITOR AND INDUCTOR; AND MEANS FOR APPLYING THE RECTIFIED, SMOOTHED QUENCH SIGNAL FROM THE RECTIFYING AND SMOOTHING MEANS TO SAID CONTROL ELECTRODE TO TURN ON AND OFF THE FLOW OF AUDIO SIGNAL THROUGH SAID AUDIO STAGE IN RESPONSE TO SHIFT IN QUENCH FREQUENCY OCCASIONED BY THE PRESENCE AND ABSENCE OF SAID EXTERNAL SIGNAL.