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Differential phase is a kind of linearity distortion which affects the color hue in TV broadcasting. == Composite color video signal == Composite color video signal (CCVS) consists of three terms: *Monochrome (luminance) signal *Auxiliary signals (sync pulse and blanking signals ) *Color signal, which is actually a subcarrier modulated by chroma information The first two terms are usually called composite video signal (CVS) The modulation technique of the color subcarrier is quadrature amplitude modulation (QUAM ) both in PAL and NTSC systems. The amplitude of the color signal represents the saturation of the color and the phase lag of the color signal with respect to a certain reference which is called colorburst represents the hue; i.e., each phase lag is assigned for a different color hue. So, in order to reproduce the original color in the receiver, the phase difference between the colorburst and the color signal must be kept constant throughout the broadcasting. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「differential phase」の詳細全文を読む スポンサード リンク
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