USA As Represented by Secretary of the Navy

Robert G Curry, Jr

Edward L Wallace

A system for time-compressing radar video is disclosed to improve the grac presentation thereof on a CRT display. Quantized input video is pipelined as cell pairs into and out of a pair of parallelly-arranged memory banks by means of input and output latches. The memory banks are controlled having alternating read and write modes which are interchanged in synchronism with the video scan period so that a preceding scan is read out of one bank at a controlled read clock frequency while a current scan is written into the other bank at a fixed write clock frequency, the degree of video compression being determined by the ratio of the read-to-write frequencies. A pair of series-connected rate multipliers each are fed 6-bit rate words for varying the read clock frequency on either a linear or non-linear scale. Video integration is provided at the inputs of each memory bank by magnitude comparators which compare stored contents of each range cell in the banks with current input video for the respective cell and steer multiplexers to either retain or rewrite the contents of the cell.

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Severna Park, MD, United States of America

Robert G Curry, Jr