ARRANGEMENT FOR COMPENSATING DUTY FACTOR VARIATIONS IN AN OPTICAL VIDEO DISC

摘要

Processing optical video discs may result in modulation of the duty factor of the pits and lands which constitute a spatial representation of a stored carrier signal frequency modulated with program information. Such modulation of duty factor introduces spurious components that are detrimental to image reproduction if the frequency of the stored carrier signal is not at least twice the highest video frequency component to be reproduced. A correction signal is developed and used to at least partially cancel the effect of such spurious components.