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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    Titel :

    Vehicle Detector


    Beteiligte:
    C. N. Pryor (Autor:in) / E. Hug (Autor:in) / M. H. Stripling (Autor:in)

    Erscheinungsdatum :

    1970


    Format / Umfang :

    7 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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