Abstract
An approximate formula of the space and ensemble averaged reverberation decay curve in a rectangular reverberant room is derived here theoretically. This approximate decay curve is written by the summation of the decay curve in three (oblique, tangential, and axial) types of diffuse fields. This formula contains not only the averaged sound absorption coefficient of the walls but the number of resonance wave modes excited in a rectangular reverberant room. The sound energy distribution rate of three types of diffuse fields at the steady state is determined by the ratio of the number of resonance wave modes constituting each type of diffuse field.
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