The results of a field test to determine the directional characteristics of acoustic waves propagated through a jungle from overflying aircraft are presented. In general, when aircraft are directly over the test site, the sound at a point 20 ft. above the ground arriving from the direction of the ground measures about 6 dB lower than sound arriving from overhead. As the aircraft becomes further from the test site, the difference becomes less. (Author)


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    Title :

    Acoustics Tests in Puerto Rico


    Contributors:

    Publication date :

    1968


    Size :

    23 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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