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为了重现彩色图象,彩色显象管的三个电子束必须由三基色信号电压U′_R、U′_G和U′_B来调制。基色信号电压应有足够的幅度,以保证图象有适当的对比度。怎样利用视频检波输出的低电平彩色电视全信号(经过副载波陷波器吸收掉部分色度信号以后可作为亮度信号U′_Y来使用)和同步检波器输出的低电平色差信号U′_(R-Y)、U′_(B-Y)来产生所需的高电平的三个基色信号U′_R、U′_G和U′_B,就是这一讲所要说明的主要问题。
To reproduce the color image, the three electron beams of the color picture tube must be modulated by the three primary color signal voltages U'_R, U'_G and U'_B. The primary color signal voltage should have enough amplitude to ensure proper contrast of the image. How to use the low-level color television signal output by the video detection (which can be used as the brightness signal U'_Y after the subcarrier notch filter absorbs a part of the chrominance signal) and the low-level color difference signal U 'output by the synchronous detector _ (RY), U'_ (BY) to generate the desired high level three primary color signals U'_R, U'_G and U'_B, are the main issues to be explained.