Phase quadrature transmission system with receiver detectors controlled in response to presence of pilot waves appearing as crosstalk

Claim 1

IN A SUPPRESSED CARRIER QUADRATURE MODULATION SYSTEM HAVING A PILOT SIGNAL AT A FIRST FREQUENCY IN ITS DIRECT CHANNEL AND A PILOT SIGNAL AT A SECOND FREQUENCY IN ITS QUADRATURELY RELATED CHANNEL, A RECEIVER COMPRISING CONTROLLABLE MEANS GENERATING A PAIR OF NOMINALLY QUADRATURELY RELATED WAVES, FIRST AND SECOND MODULATING MEANS MODULATING SAID QUADRATURELY RELATED WAVES, RESPECTIVELY, WITH INPUT SIGNALS TO SAID RECEIVER TO PRODUCE FIRST AND SECOND OUTPUTS, RESPECTIVELY, MEANS RESPONSIVE TO SIGNALS AT SAID SECOND FREQUENCY FROM AT LEAST ONE OF SAID OUTPUTS TO CONTROL THE FREQUENCY OF SAID QUADRATURELY RELATED WAVES TO REDUCE TO A MINIMUM LEVEL SAID SECOND FREQUENCY SIGNALS IN SAID FIRST OUTPUT, MEANS RESPONSIVE TO SIGNALS AT SAID FIRST FREQUENCY FROM AT LEAST ONE OF SAID OUTPUTS TO CONTROL THE PHASE DIFFERENCE BETWEEN SAID QUADRATURELY RELATED WAVES TO REDUCE TO A MINIMUM LEVEL SAID FIRST FREQUENCY SIGNAL IN SAID SECOND OUTPUT, OUTPUT TERMINALS, AND MEANS CONNECTING SAID OUTPUT TERMINALS TO SAID FIRST AND SECOND MODULATING MEANS.