Quadrature phase splitting circuit

Claim 1

IN A COLOR TELEVISION RECEIVER A CIRCUIT FOR DERIVING QUADRATURE PHASE COMPONENTS OF A CHROMA SIGNAL COMPRISING A SOURCE OF CHROMA SIGNALS HAVING AN OUTPUT AT WHICH SAID CHROMA SIGNALS APPEAR, A BANDPASS FILTER HAVING AN INPUT AND AN OUTPUT WHICH PROVIES A 90* PHASE SHIFT THEREBETWEEN, MEANS FOR COUPLING THE CHROMA SIGNALS FROM THE OUTPUT OF SAID SOURCE TO THE INPUT OF SAID BANDPASS FILTER, A FIRST SYNCHRONOUS DETECTOR HAVING TWO INPUTS AND AN OUTPUT, MEANS FOR COUPLING THE CHROMA SIGNAL APPEARING AT SAID OUTPUT OF SAID SOURCE TO ONE OF SAID INPUTS OF SAID SYNCRONOUS DETECTOR, A SECOND SYNCHRONOUS DETECTOR HAVING TWO INPUTS AND AN OUTPUT, MEANS FOR COUPLING THE CHROMA SIGNALS AS THEY APPEAR AT THE SAID OUTPUT OF SAID BANDPASS FILTER TO ONE OF SAID INPUTS OF SAID SECOND SYNCHRONOUS DETECTOR, A SOURCE OF REFERENCE WAVES, AND MEANS FOR COUPLING THE REFERENCE WAVES PROVIDED BY SAID LATTER SOURCE TO EACH OF SAID OTHER INPUTS OF SAID FIRST AND SECOND SYNCHRONOUS DETECTORS SO AS TO PRODUCE THE QUADRATURE PHASED COMPONENTS OF SAID CHROMA SIGNAL AT THE OUTPUTS OF SAID FIRST AND SECOND SYNCHRONOUS DETECTORS RESPECTIVELY.