彩色电视是基于把红(R)、绿(G)、蓝(B)三种基色光按各种不同比例组合,迭加成各种不同彩色的原理而工作的.考虑到能与黑白电视广播兼容,彩色电视广播采用了把对应于红、绿、蓝三种颜色的色信号,经过编码转换成包含有亮度(Y)和色度(C)信号的彩色全电视信号的办法,再以全电视信号调制高频载波而发射的. 当黑白电视机接收彩色电视广播信号时,可显示出其中的亮度信号,而色度信号仅为不甚明显的斜网状干扰.对于彩色电视机来说,它的亮度通道可显示黑白电视节目;而在接收彩色电视广播时,通过解码电路等把彩色全电视信号恢复成红、绿、蓝三个色信号,经彩色显象管转换成彩色图象,从而达到接收彩色与黑白电视广播的兼容.工作正常的彩色电视机因在亮度通道设有副载波吸收回路,可消除色度信号干扰,故干扰可见度大为减少.如果彩色电视机的制式不同, Color television is based on the red (R), green (G), blue (B) three kinds of primary colors in various combinations according to different combinations, superimposed into a variety of different colors of the principle and work to consider with black and white television broadcasting Compatible with color television broadcasting, a color television signal corresponding to three colors of red, green and blue is encoded and converted into a full-color television signal including luminance (Y) and chrominance (C) signals, Television signals modulated high-frequency carrier and transmit.When the black and white TV receiver color television broadcast signal, which can show one of the brightness signal, and the chrominance signal is only not obvious oblique reticular interference.For color TV sets , Its brightness channel can display black and white television programs; and in the reception of color television broadcasting, through the decoding circuit to restore full color television signals into red, green and blue three color signals, the color picture tube into a color image , So as to achieve the compatibility of receiving color and black and white television broadcasting.A normal color TV set with subcarrier absorption circuit in the luminance channel can eliminate the interference of chrominance signal and greatly reduce the interference visibility.If the color TV sets have different formats ,