Single sideband receiver having squelch and phase-locked detection means

Claim 1

A DETECTOR FOR AN INCOMING SIGNAL HAVING A CARRIER OF GIVEN FREQUENCY, INCLUDING IN COMBINATION, INPUT CIRCUIT MEANS FOR TRANSLATING THE INCOMING SIGNAL, A FIRST PHASE DETECTOR COUPLED TO SAID INPUT CIRCUIT MEANS, A LOW PASS SUB-AUDIO FREQUENCY FILTER CONNECTED TO SAID FIRST PHASE DETECTOR, REACTANCE CONTROL MEANS COUPLED TO SAID LOW PASS FILTER, OSCILLATOR CIRCUIT MEANS INCLUDING A FIRST OSCILLATOR ADAPTED TO BE CONTROLLED BY SAID REACTANCE CONTROL MEANS, A SECOND OSCILLATOR AND MIXING MEANS CONNECTED TO SAID FIRST AND SECOND OSCILLATOR TO PRODUCE A REFERENCE SIGNAL OF THE GIVEN FREQUENCY, CIRCUIT MEANS FOR APPLYING THE REFERENCE SIGNAL TO SAID FIRST PHASE DETECTOR FOR COMPARISON THEREIN WITH THE CARRIER OF THE INCOMING SIGNAL AND FOR LOCKING THE REFERENCE SIGNAL AND THE CARRIER IN 90* PHASE RELATION, A SECOND PHASE DECTECTOR COUPLED TO SAID INPUT CIRCUIT MEANS AND TO SAID OSCILLATOR CIRCUIT MEANS FOR COMPARISON OF THE CARRIER AND THE REFERENCE SIGNAL, AND OUTPUT CIRCUIT MEANS CONNECTED TO SAID SECOND PHASE DETECTOR AND ADAPTED TO DERIVE THEREFROM INFORMATION OF THE INCOMING SIGNAL.