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Knowledge of sound absoption theory

Sound absorption is the phenomenon of energy loss after the impact of sound waves on the surface of the material. Sound absorption can reduce the sound pressure level in the room. The index of sound absorption is the absorption coefficient effect, which represents the ratio of the sound energy absorbed by the material to the incoming sound energy. In theory, if a material completely reflects sound, its a = 0; if a material absorbs all the incident sound energy, its a = 1. In fact, a of all materials is between 0 and 1, that is, it is impossible to reflect and absorb all of them.