avorable conditions possible. If a sound is produced in still air in open space it spreads in aspherical wave diminishing in intensity as it covers a greater area.The area of a sphere being proportioned to the square of the radius,we arrive at the common law that the intensity of sound in still… … Fig. 1 the whole sphere being carried along. If the air is moving towardthe observer, the sound reaches him in less time than it otherwisewould, therefore spread over a less spherical surface and louder.If, on the other hand, the observer is to windward, the sound hashad to come against the wind,…
Architectural acoustics
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