Abstract
Existing subjective results relating to the effect of undistorted echo in television have been applied to determine the psychophysical relationship between subjective picture quality and the objective measure of linear waveform distortion, termed the `K-rating?. Values of the coefficients G and KM are given, which, starting with a known value of K, permit estimates to be made of mean picture quality and of subjective impairment in summable (imp) units.
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