The subjective effects of timing instabilities in television signals have been studied. In Part 1 of the Report, movements of the monochrome picture due to fairly large timing errors are considered, and the effects of the performance of the receiver horizontal-synchronizing circuits are explored. For the simple case in which the timing error is a simple periodic function, a specification is derived for the allowable error for barely perceptible impairment with the worst-case receiver synchronizing circuits expected.nFor the more usual case in which multiple timing errors occur, an objective measure of the subjective impairment cannot readily be found. To facilitate the assessment of equipment, such as video tape recorders, details are given of a simulator providing horizontal synchronizing-circuit performances equivalent to worst-case and typical receivers.
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