The differential phase refers to the phase change of the color carrier component caused by the change in the luminance signal amplitude associated with chrominance. In the NTSC system, the change in the vector angle of the color signal represents the change in hue, so the effect of the differential phase on the signal is very serious. The PAL system uses the progressive phase inversion technique, so the self-compensation effect replaces the change in hue with the change of color saturation. In general, the differential phase is a parameter used to describe the effect of the amplitude variation of the luminance signal on the color hue.
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