Abstract
The production of random sound fields in reverberation chambers is very necessary for the determination of sound absorption coefficients and sound transmission losses. Various techniques for randomizing sound fields have been proposed in the past. The aim of this paper is to present experimental results comparing the suitability or otherwise of some of the practices of randomizing sound fields, viz., altering the room geometry by a rotating vane, by fixed scattering surfaces on the walls or in space, or by absorbing patches on the walls. To assess the state of randomness of the sound field three methods were used: the correlation coefficient between two observation points, the standard deviation of reverberation time measurements, and the measurement of the sound absorption coefficient of a standard sample.
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