Abstract
Measurements of the reverberation time of a small (29 m3) room have been made using the Schroeder impulse response method while the air in the room was agitated by a 0.65-m-diam, 14-bladed, 2.6-kW fan and compared with similar measurements made with the fan off. The decay times were found to be shorter when the fan was on and this decay time difference is ascribed to an effective extra attenuation α1, due to scattering of the sound field by the fan-generated turbulence. Only order-of-magnitude estimates of α, are possible; α1 ∼ 10−3 m−1 and is frequency-independent from 600 Hz to 5 kHz. The results agree to an order of magnitude with recent turbulence scattering theories. Some of the implications of these measurements for present theories and future experiments are discussed.
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