Automatic gain controlled plural wave band radio receiver

Claim 1

A PLURAL WAVE BAND RADIO RECEIVER FOR UTILIZING A FIRST CARRIER WAVE AMPLITUDE-MODULATED WITH AUDIO INFORMATION AND HAVING A CARRIER FREQUENCY LYING WITHIN A FIRST WAVE BAND, AND FOR ALSO UTILIZING A SECOND CARRIER WAVE MODULATED WITH AUDIO INFORMATION AND HAVING A CARRIER FREQUENCY LYING WITHIN A SECOND WAVE BAND ABOVE SAID FIRST WAVE BAND IN THE FREQUENCY SPECTRUM, COMPRISING: A FIRST AMPLIFYING CHANNEL HAVING A FIRST TUNED CIRCUIT FOR DEVELOPING THEREACROSS, DURING A CERTAIN INTERVAL AND IN RESPONSE TO THE RECEPTION OF SAID FIRST CARRIER WAVE, AN AMPLITUDE-MODULATED CARRIER SIGNAL HAVING A PREDETERMINED CARRIER FREQUENCY AND HAVING A PEAK AMPLITUDE DETERMINED BY THE STRENGTH OF SAID FIRST CARRIER WAVE; A SECOND AMPLIFYING CHANNEL HAVING A SECOND TUNED CIRCUIT FOR DEVELOPING THEREACROSS, DURING ANOTHER INTERVAL AND IN RESPONSE TO THE RECEPTION OF SAID SECOND CARRIER WAVE, A MODULATED CARRIER SIGNAL HAVING A CARRIER FREQUENCY WHICH IS HIGHER THAN SAID PREDETERMINED CARRIER FREQUENCY AND HAVING A PREDETERMINED PEAK AMPLITUDE DETERMINED BY THE STRENGTH OF SAID SECOND CARRIER WAVE; AN AMPLITUDE MODULATION DETECTOR, INCLUDING ONLY ONE UNIDIRECTIONAL CONDUCTIVE DEVICE, COUPLED TO SAID FIRST TUNED CIRCUIT AND INCLUDING AN AUDIO OUTPUT CIRCUIT FOR DEVELOPING, DURING SAID CERTAIN INTERVAL AND IN RESPONSE TO SAID AMPLITUDE-MODULATED CARRIER SIGNAL, AN AUDIO SIGNAL REPRESENTING THE AUDIO INFORMATION CARRIED BY SAID FIRST CARRIER WAVE, AND INCLUDING A FILTER NETWORK FOR DEVELOPING A D.C. CONTROL POTENTIAL OF A MAGNITUDE DETERMINED BY THE AVERAGE PEAK AMPLITUDE OF SAID AMPLITUDE-MODULATED CARRIER SIGNAL; MEANS, INCLUDING A CAPACITOR, COUPLING SAID SECOND, TUNED CIRCUIT TO SAID UNIDIRECTIONAL CONDUCTIE DEVICE FOR APPLYING, DURING SAID OTHER INTERVAL SAID MODULATED CARRIER SIGNAL WITH SUBSTANTIALLY SAID SAME PREDETERMINED PEAK AMPLITUDE TO SAID AMPLITUDE MODULATION DETECTOR TO PRODUCE IN SAID FILTER NETWORK A D.C. CONTROL POTENTIAL OF A MAGNITUDE DETERMINED BY THE AVERAGE PEAK AMPLITUDE OF SAID MODULATED CARRIER SIGNAL, SAID CAPACITOR PRESENTING A RELATIVELY HIGH IMPEDANCE AT SAID PREDETERMINED CARRIER FREQUENCY TO EFFECTIVELY DECOUPLE SAID SECOND TUNED CIRCUIT FROM SAID AMPLITUDE MODULATION DETECTOR DURING THE RECEPTION OF SAID FIRST CARRIER WAVE; AND MEANS FOR UTILIZING SAID D.C. CONTROL POTENTIALS TO AUTOMATICALLY CONTROL THE GAIN OF SAID RADIO RECEIVER.