Sperry Rand Corporation

Kenneth L Pearson

James V Drexler

Alan D Kaske

A time of event recorder in which a Gray Code counter is regularly advanced at a predetermined frequency by a crystal controlled oscillator and the outputs from the counter stages are applied to the digit lines of a MATED FILM memory array, such that when an event associated with a given word line of the memory occurs, the counter contents at the time of occurrence of the event are stored in that memory word register. A second array of MATED FILM elements is also provided which has its digit lines energized at a fixed submultiple of the frequency of the crystal controlled oscillator to provide greater accuracy and resolution than is obtainable from the Gray Code counter. The elapsed time between two events may be obtained by reading out two words from the memory and determining the difference in counts associated with the two events under consideration.

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Burnsville, MN, United States of America

Kenneth L Pearson