Abstract
Recent experimental results obtained at the National Research Council of Canada confirmed the theoretical prediction that the standard deviation of levels for pure‐tone excitation in a room without moving elements is 5.57 dB. However, contrary to the general belief, the reverberant field created here is not random. Two‐point space‐time cross‐correlation measurements reveal that the field is definitely coherent. This experimental finding is supported by a theoretical analysis based on the modal theory of room acoustics. Some comments and recommendations for the present standards concerning pure‐tone power measurements in reverberation chambers will be given.
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