Color television receiver including transistorized color killer

Claim 1

IN A TELEVISION RECEIVER ADAPTED TO RECEIVE BOTH COLOR AND BACK AND WHITE TELEVISION SIGNALS, SAID COLOR SIGNAL INCLUDING A CHROMINANCE VIDEO SIGNAL COMPONENT IN THE FORM OF A PHASE AND AMPLITUDE MODULATED SUBCARRIER WAVE OF A GIVEN FREQUENCY AND COLOR SYNCHRONIZING BURSTS COMPRISING SEVERAL CYCLES OF SAID SUBCARRIER WAVE FREQUENCY AND HAVING A FIXED AMPLITUDE, THE COMBINATION COMPRIISING: A FIRST TRANSISTOR AMPLIFIER PROVIDED WITH INPUT AND OUTPUT CIRCUITS AND HAVING SAID COMPOSITE TELEVISION SIGNAL IMPRESSED UPON ITS INPUT CIRCUIT AND ADAPTED TO AMPLIGY AND DEVELOP IN ITS OUTPUT CIRCUITS SUBSTANTIALLY ONLY SIGNALS IN THE FREQUENCY RANGE OF SAID SUBCARRIER WAVE AND ITS MODULATION SIDEBANDS; A SECOND TRANSISTOR AMPLIFIER PROVIDED WITH INPUT AND OUTPUT CIRCUITS AND HAVING ITS INPUT CIRCUIT COUPLED TO THE OUTPUT CIRCUIT OF SAID FIRST TRANSISTOR AMPLIFIER AND ADAPTED TO AMPLIFY AND DEVELOP IN ITS OUTPUT CIRCUIT SUBSTANTIALLY ONLY SIGNALS IN THE RANGE OF SAID SUBCARRIER WAVE AND ITS MODULATION SIDEBANDS; MEANS COUPLED TO SAID FIRST TRANSISTOR AMPLIFIER TO DEVELOP A UNDIRECTIONAL CONTROL SIGNAL REPRESENTATIVE OF THE AMPLITUDE OF SAID COLOR SYNCHRONIZING BURSTS; MEANS TO IMPRESS SAID CONTROL SIGNAL ON THE INPUT CIRCUIT OF SAID FIRST TRANSISTOR AMPLIFIER TO VARY ITS GAIN INVERSELY TO THE AMPLITUDE OF SAID COLOR SYNCHRONIZING BURSTS; A COLOR KILLER CIRCUIT INCLUDING A COLOR KILLER TRANSISTOR; MEANS RESPONSIVE TO CURRENT FLOW IN SAID FIST TRANSISTOR AMPLIFIER TO BIAS SAID COLOR KILLER TRANSISTOR SO THAT THE CURRENT IN SAID FIRST TRANSISTOR AMPLIFIER PRODUCED IN THE ABSENCE OF SAID MODULATED SUBCARRIER WAVE EFFECTS CURRENT CONDUCTION OF A FIRST MAGNITUDE IN SAID COLOR KILLER CIRCUIT AND SO THAT THE CURRENT IN SAID FIRST TRANSISTOR AMPLIFIER PRODUCED IN RESPONSE TO A MODULATED SUBCARRIER WAVE EFFECT CURRENT CONDUCTION OF A SECOND MAGNITUDE IN SAID COLOR KILLER CIRCUIT; AND MEANS RESPONSIVE TO CURRENT FLOW IN SAID COLOR KILLER CURCUIT TO BIAS SAID SECOND TRANSISTOR AMPLIFIER SO THAT SAID SECOND TRANSISTOR AMPLIFIER IS RENDERED IN OPERATIVE IN RESPONSE TO SAID FIRST MAGNITUDE OF CURRENT CONDUCTION IN SAID COLOR KILLER CIRCUIT AND IS RENDERED OPERATIVE TO AMPLIFY SAID CHROMINANCE VIDEO SIGNAL COMPONENT IN RESPONSE TO SAID SECOND MAGNITUDE OF CURRENT CONDUCTION IN SAID COLOR KILLER CIRCUIT.