Importance

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Abstract

In a memory control apparatus for providing various video display functions by means of a video memory into which video data constituting successive units, such as, frames or fields, or video information are written at repeatedly changing write addresses while concurrently reading out the data from repeatedly changing read-out addresses; the video memory is provided with at least four memory areas each having a capacity to store one of the units of video information, impending overtaking of the write and read-out addresses relative to each other is detected, and, in response to such detection, the one of the memory areas in which the data is being written or read-out is changed so as to maintain a separation of the write and read-out addresses sufficient to ensure avoidance of overtaking and consequent disturbance of the displayed image.

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First Claim