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acoustic shadow
An acoustic shadow or sound shadow is an area through which sound waves fail to propagate, due to topographical obstructions or disruption of the waves via phenomena such as wind currents, buildings, or sound barriers.
== Short distance acoustic shadow ==
A short distance acoustic shadow occurs behind a building or a sound barrier. The sound from a source is shielded by the obstruction. Due to diffraction around the object, it will not be completely silent in the sound shadow. The amplitude of the sound can be reduced considerably however, depending on the additional distance the sound has to travel between source and receiver.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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