CIRCUIT ARRANGEMENT FOR PROCESSING COLOUR TELEVISION SIGNALS

摘要

A circuit arrangement for processing colour television signals incorporated in a multi-mode type colour TV receiver which is capable of receiving TV signals processed by different television systems such as NTSC and PAL systems. The circuit arrangement for processing colour television signals comprises a first colour demodulator (76) for demodulating a composite colour signal by a first colour subcarrier (B-YCW) having a first phase with respect to a first demodulation axis (B-Y), a second colour demodulator (77) for demodulating said composite colour signal by a second colour subcarrier (R-YCW) having a second phase with respect to a second demodulation axis (R-Y), a matrix circuit (75) for producing a colour demodulation signal having a third phase with respect to a third demodulating axis (G-Y) by vector-synthesizing the colour demodulation signals delivered from said first and second colour demodulators; and means for generating a correction vector signal ((G-Y)UD) so as to correct said third phase of the colour demodulation signal produced by said matrix circuit (75) in such a manner that said correction vector signal is added to said colour demodulation signal of the matrix circuit so as to shift said third phase of the colour demodulation signal with respect to said third demodulation axis.