Color television demodulation network

Claim 1

A COLOR-DIFFERENCE VOLTAGE DEMODULATION NETWORK FOR AN EQUIBAND COLOR TELEVISION RECEIVER COMPRISING: FIRST, SECOND, AND THIRD SYNCHRONOUS DEMODULATOR CIRCUITS; A SINGLE SOURCE OF BAND LIMITED CHROMINANCE VOLTAGE, SAID BAND LIMITED CHROMINANCE VOLTAGE HAVING FIRST AND SECOND QUADRATURE RELATED COLOR-DIFFERENCE COMPONENTS AND A THIRD COLOR-DIFFERENCE COMPONENT; A SOURCE OF REFERENCE VOLTAGE OF SUBCARRIER FREQUENCY HAVING PHASE COHERENCE WITH ONE OF SAID TWO QUADRATURE RELATED COLORDIFFERENCE COMPONENTS OR A COMPLEMENT THEREOF; MEANS INCLUDING A PHASE SHIFT NETWORK FOR COUPLING SAID BAND LIMITED CHROMINANCE VOLTAGE AND SAID REFERENCE VOLTAGE TO SAID FIRST AND SECOND DEMODULATOR CIRCUITS FOR DEMODULATION OF SAID QUADRATURE RELATED COLOR-DIFFERENCE COMPONENTS; A RESISTIVE MATRIX NETWORK HAVING FIRST AND SECOND INPUT TERMINALS AND AN OUTPUT TERMINAL; MEANS COUPLING SAID BAND LIMITED CHROMINANCE VOLTAGE FROM SAID SOURCE TO SAID FIRST MATRIX INPUT TERMINAL; MEANS COUPLING A VOLTAGE FROM SAID PHASE SHIFT NETWORK TO SAID MATRIX SECOND INPUT TERMINAL; SAID MATRIX NETWORK ARRANGED FOR PROVIDING AN OUTPUT CHROMINANCE VOLTAGE AT SAID OUTPUT TERMINAL HAVING AN AMPLITUDE WHICH IS PROPORTIONAL TO THE AMPLITUDE OF SAID THIRD COLOR-DIFFERENCE COMPONENT; AND MEANS COUPLING SAID OUTPUT VOLTAGE FROM SAID MATRIX OUTPUT TERMINAL AND SAID REFERENCE VOLTAGE FROM SAID SOURCE TO SAID THIRD DEMODULATOR CIRCUIT FOR DEMODULATION OF SAID THIRD COLOR-DIFFERENCE COMPONENT.