Interstage network using cancellation trap

Claim 1

IN A TELEVISION RECEIVER INCLUDING A FIRST ELECTRON DISCHARGE DEVICE HAVING AN OUTPUT ELECTRODE, A SECOND ELECTRON DISCHARGE DEVICE HAVING AN INPUT ELECTRODE, SAID FIRST ELECTRON DISCHARGE DEVICE DEVELOPING INTERMEDIATE SIGNAL FREQUENCIES AT SAID OUTPUT ELECTRODE IN RESPONSE TO WAVES RECEIVED BY SAID RECEIVER, SAID INTERMEDIATE FREQUENCY SIGNALS INCLUDING PICTURE INTERMEDIATE FREQUENCY SIGNAL COMPONENTS OCCUPYING A PREDETERMINED BAND OF FREQUENCIES AND A MODULATED SOUND CARRIER COMPONENT, SAID SOUND CARRIER APPEARING AT AN INTERMEDIATE FREQUENCY OUTSIDE SAID PREDETERMINED BAND, A COUPLING NETWORK FOR COUPLING SAID OUTPUT ELECTRODE TO SAID INPUT ELECTRODE, SAID COUPLING NETWORK COMPRISING A FIRST RESONANT CIRCUIT CONNECTED TO SAID OUTPUT ELECTRODE, A SECOND RESONANT CIRCUIT CONNECTED TO SAID INPUT ELECTRODE, AND A SECOND CARRIER TRAP CIRCUIT UTILIZED TO COUPLE SAID FIRST RESONANT CIRCUIT TO SAID SECOND RESONANT CIRCUIT, SAID SOUND CARRIER TRAP CIRCUIT COMPRISING AN INPUT TERMINAL COUPLED TO SAID FIRST RESONANT CIRCUIT, AN OUTPUT TERMINAL COUPLED TO SAID SECOND RESONANT CIRCUIT, A PAIR OF MUTUALLY INDUCTIVELY COUPLED WINDINGS CONNECTED IN SERIES BETWEEN SAID INPUT TERMINAL AND SAID OUTPUT TERMINAL, A PARALLEL RESONANT CIRCUIT COMPRISING AN INDUCTANCE ELEMENT IN SHUNT WITH A CAPACITANCE ELEMENT, SAID INDUCTANCE ELEMENT HAVING A PLURALITY OF TERMINALS, MEANS FOR CONNECTING ONE OF SAID INDUCTANCE ELEMENT TERMINALS TO A POINT OF REFERENCE POTENTIAL, AND MEANS FOR CONNECTING ANOTHER OF SAID INDUCTANCE ELEMENT TERMINALS TO THE POINT OF COMMON CONNECTION OF SAID PAIR OF WINDINGS, THE INDUCTANCE VALUE OF SAID WINDINGS BEING CHOSEN RELATIVE TO ANY CAPACITANCE ASSOCIATED THEREWITH IN SAID NETWORK SUCH THAT SAID WINDINGS ARE EFFECTIVELY TUNED TO A FREQUENCY SUFFICIENTLY REMOTE FROM SAID PREDETERMINED PASSBAND THAT SAID WINDINGS APPEAR AS EFFECTIVELY UNTUNED WINDINGS WITH RESPECT TO SAID INTERMEDIATE FREQUENCY SIGNALS.