| 摘要 |
PURPOSE:To suppress spurious interruption from power supply effectively without deterioration of video quality, by providing a resistor-capacitance distributed constant circuit as a filter in the transmission line for color difference signal. CONSTITUTION:A chrominance subcarrier signal applied from an input 1 is demodulated with a carrier signal for color demodulation at a multiplier 3 to be a color difference signal (Y-R), and the primary color signal R is produced at an output 9 by being matrix with the luminance signal Y at a transistor 6. In this case, since the signal (Y-R) appeared at the output of the multiplier 3 is transmitted to the transistor 6 via a resistor-capacitor distributed circuit 10, the harmonics of chrominance subcarrier can be suppressed effectively at the circuit 10, allowing to suppress the spurious interference of power supply sufficiently. Since the circuit 10 gives almost no attenuation to a signal near 3.58MHz, the deterioration of the detailed profile reproducibility of color picture is very little. |
