Abstract
This experiments were made for the purpose of investigation to audibility of ship's acoustic signals. The following became clear after the experiments with the trial acoustic generator. (1) At the distance within 1 N.M., the attenuations of propagation are constant to signal's frequencys from 100 to 700Hz. (2) The attenuations at upwind are proportional to the sixth power law of distance. (3) The attenuations at downwind and crosswind obey geometric diffusion. (4) With aim at audibility above 4 N.M., the required sound pressure level (a point of 20m) of acoustic equipments is more than 120dB, and its frequencys are from 300 to 400Hz.
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