Color demodulation apparatus

Abstract From the Canadian patent

Apparatus for demodulating color difference signals from a chroma signal in a color television receiver set includes first and second differential amplifiers and a matrix circuit comprising a constant current circuit. Output terminals of the differential amplifiers and the matrix circuit are connected to a power supply through load resistors of the same resistance, respectively, through which D.C. currents of the same magnitude are passed. Resistors for combining signals are connected to the load resistors and a common chroma signal is applied to the first and second differential amplifiers while sub-carriers of different phase are applied to the first and second differential amplifiers to …