The patent relates to a line spectrum detector to distinguish motor vehicles acoustically in the presence 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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    Title :

    Vehicle Detector


    Contributors:
    C. N. Pryor (author) / E. Hug (author) / M. H. Stripling (author)

    Publication date :

    1970


    Size :

    7 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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