Abstract
The measurement of sound-power level in semireverberant rooms is discussed. The standard equations for calculating sound-power level in reverberant and semireverberant rooms are compared. It is shown that for many practical measurements, the two equations produce essentially the same result. In particular, when the area of the room is equal to four times the area of the hemisphere surrounding the source, the results are identical under normal room conditions. This is also true for a cube-shaped room, if the distance from the source is one-half the wall dimension. Sound-power-level measurements made in three semireverberant rooms on a small electric motor are reported to illustrate this result. The effect of a partial enclosure on the sound-power level is also discussed.
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