Leakage elimination circuit

Claim 1

A CIRCUIT FOR ELIMINATING THE CARRIER SIGNAL COMPONENT OF A CONTINUOUS WAVE MULTIFREQUENCY SIGNAL HAVING A CARRIER SIGNAL COMPONENT AND A PLURALITY OF SIDEBAND SIGNAL COMPONENTS INCLUDING, A BALANCED MIXER, MEANS FOR APPLYING THE CARRIER SIGNAL COMPONENT AND THE SIDEBAND COMPONENTS AS A COMPLEX SIGNAL TO SAID MIXER, A LOCAL OSCILLATOR FOR GENERATING A SIGNAL THE FREQUENCY OF WHICH MAY BE VARIED IN ACCORDANCE WITH THE VALUE OF A CONTROL SIGNAL, MEANS FOR APPLYING SAID GENERATED SIGNAL TO SAID MIXER, SAID MIXER HAVING AN OUTPUT SIGNAL THE FREQUENCY OF WHICH IS THE DIFFERENCE OF THE COMPLEX SIGNAL AND THE LOCAL OSCILLATOR SIGNAL AND HAVING CHARACTERISTICS OF THE SAID COMPLEX SIGNAL, MEANS FOR FILTERING THE OUTPUT SIGNAL OF THE MIXER AND FOR SEPARATING SAID OUTPUT SIGNAL INTO A FIRST SIGNAL AND A SECOND SIGNAL, THE LOWEST FREQUENCY OF SAID SECOND SIGNAL BEING HIGHER THAN THE HIGHEST FREQUENCY OF SAID FIRST SIGNAL, WHEREBY THE SIGNAL COMPONENT BETWEEN SAID FIRST AND SECOND SIGNALS CORRESPONDS TO SAID CARRIER SIGNAL COMPONENT, MEANS FOR DETECTING THE BANDWITH AND FREQUENCY LEVEL BETWEEN THE HIGHEST FREQUENCY OF SAID FIRST SIGNAL AND THE LOWEST FREQUENCY OF SAID SECOND SIGNAL AND FOR PROVIDING A CONTROL SIGNAL, THE VALUE OF WHICH IS REPRESENTATIVE OF SAID BANDWIDTH AND FREQUENCY LEVEL SO DETECTED, MEANS FOR APPLYING SAID CONTROL SIGNAL TO SAID LOCAL OSCILLATOR, MEANS FOR SUMMING SAID FIRST SIGNAL AND SAID SECOND SIGNAL AND FOR PROVIDING AN OUTPUT CORRESPONDING TO SUCH SUMMED SIGNALS, MEANS FOR AMPLIFYING THE LAST MENTIONED OUTPUT, A SECOND BALANCED MIXER, MEANS FOR APPLYING SAID LAST MENTIONED OUTPUT TO SAID SECOND BALANCED MIXER, AND MEANS FOR APPLYING THE SIGNAL GENERATED BY SAID LOCAL OSCILLATOR TO SAID SECOND BALANCED MIXER WHEREBY SAID SECOND BALANCED MIXER PROVIDES AN OUTPUT DUPLICATING THE SAID SIDEBAND SIGNAL COMPONENTS OF THE SAID COMPLEX SIGNAL.