DG is a botheration both in NTSC and PAL. But PAL is added sensetive to this affectionate of distortion. System PAL averages appearance differences of blush arresting in two after lines.1 Let \alpha be the appearance lag.
\mbox{f(t)} =\frac{1}{2}(\sin(\omega t+\alpha) +\sin(\omega t-\alpha))= \sin(\omega t)\cdot\cos(\alpha)
So the appearance differences amid two after curve (so alleged cogwheel phase) are adapted to cogwheel accretion distortions. ( Hue is preserved at the accident of decreased saturation)
For example, a cogwheel appearance of 100 introduces an added accretion accident of % 2.
\mbox{f(t)} =\frac{1}{2}(\sin(\omega t+\alpha) +\sin(\omega t-\alpha))= \sin(\omega t)\cdot\cos(\alpha)
So the appearance differences amid two after curve (so alleged cogwheel phase) are adapted to cogwheel accretion distortions. ( Hue is preserved at the accident of decreased saturation)
For example, a cogwheel appearance of 100 introduces an added accretion accident of % 2.
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