Color demodulation apparatus

专利名称：Color demodulation apparatus发明人：Namio Yamaguchi,Yasuyuki Sato申请号：US05/791002申请日：19770426公开号：US04122491A公开日：19781024

摘要：Apparatus for demodulating color difference signals from a chroma signal in acolor television receiver set includes first and second differential amplifiers and a matrixcircuit comprising a constant current circuit. Output terminals of the differential

amplifiers and the matrix circuit are connected to a power supply through load resistorsof the same resistance, respectively, through which D.C. currents of the same magnitudeare passed. Resistors for combining signals are connected to the load resistors, and acommon 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 toeffect synchronous detection to demodulate color difference signals of differentdemodulation axes across the load resistor. With this arrangement, a plurality of stablecolor difference signals of uniform D.C. level can be produced and the number ofterminal pins required can be reduced so that the demodulation apparatus is readilyimplemented in an integrated circuit structure.

申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

代理机构：Stevens, Davis, Miller & Mosher

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