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Abstract

This report deals with one form of distortion introduced by the reception of colour television using a vestigial-sideband system. In a system such as that of the N.T.S.C. modified to British standards, incoherent detection results in an increase of the luminance signal and a reduction in the chrominance signal. The effect with colour receivers is to reduce the saturation of colours without changing their hues. An extreme case is that of a fully saturated blue signal of maximum amplitude for which the luminance component is increased by 75% and the saturation consequently reduced by 46%. In the case of a fully saturated blue signal of 75% full amplitude, the luminance component is increased by 56% and the saturation reduced by 38%.

The effect with monochrome receivers is to increase the luminance of those parts of the received picture where the original colour is of high saturation; this effect, which cannot be eliminated by using a "notch" filter in the video stage to reduce the chrominance signal amplitude, may in some circumstances have desirable consequences.

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