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Methods of sound di usion assessment presented in literature require information on directional properties of the sound eld in stationary state. These methods are complicated and not often applicable in measurement practice. Measurement of the sound eld di usivity during its formation can be assessed from sound level decay curve deviation from a linear shape. With this method, the degree of di usivity has been determined in three rooms. Measurements were performed in rooms di ering in volumes and sound absorption. Changes in sound decay uniformity were noted, which can be translated into di usion coe cient changes. Results indicate that di usion increases as room absorption decreases. Di usion does not depend on room volume. Changes of sound decay uniformity follow trends that are well described by power function.

Sound Field Diffusivity Assessment in Non-Stationary State by Measuring Nonuniformity of Sound Decay Curve