USA As Represented by Secretary of the Navy

Michael H Stripling

Cabell N Pryor, Jr

Edward H Hug

A line spectrum detector to distinguish motor vehicles acoustically in the resence of background noise. The detector senses periodic signals, such as the firing rates of internal combustion engines, by using a swept phase-lock loop spectrum analyzer and passes the sensed signals to a logic network which measures the frequency stability of the sensed signal to distinguish motor vehicles from aircraft vehicles and the like.

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Silver Spring, MD, United States of America

Michael H Stripling