A Study of the Effects of Vertical Jitter on Slow-Scan Vidicon Images

Vertical jitter in a television system is caused by variations in sweep rate of the vertical-sweep voltage or current. For the Surveyor TV system, establishing a meaningful tolerance on vertical jitter was the object of a study of the effects of jitter on vertical resolution, signal-to-noise ratio, and line brightness variations, with some emphasis on the results expected for systems utilizing destructive readout and a shuttered mode of operation. The problem was approached by (1) using a mathematical model constructed for the readout and erasure process and applying this model to calculate line brightness variations due to vertical jitter and (2) analyzing the degradation in vertical resolution in terms of scene spectral densities. It was concluded that jitter distortion of the video due to high-frequency vertical-sweep noise could become significant. The results based on spectral densities led to a somewhat more severe jitter requirement than that obtained by the method of setting a limit to allowable line-to-line brightness variation.

Print ISSN

0361-4573

Published

1968-04

Content type

Original Research

DOI

10.5594/J05826