Abstract
Recent improvements in theoretical methods for predicting air-to-ground sound propagation are briefly reviewed and predictions compared with field observations previously reported in the literature. The remaining problems in theoretical methods are considered and preliminary models outlined for making practical engineering predictions of air to ground propagation loss. Representative noise source spectra are used to illustrate the expected trend in attenuation versus distance for various types of single number noise scales under a variety of atmospheric conditions. [This research has been sponsored, in part, by the Army Research Office.]
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