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Measurement Uncertainty in the Determination of the Sound Absorption in a Reverberation Room at Low Frequencies

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Both for the resonance absorber and for the broadband absorber having a large absorption capacity at low frequencies, the values of the sound absorption coefficient as measured in a reverberation room will depend considerably on the positioning of the sound source. For some types and arrangements of absorbers, the 95% confidence ranges for mean values of absorption coefficients are determined which will result when the loudspeaker position is varied. The breadth of these ranges can amount to 40% of the mean value. If one averages in a suitable way over the position of the sound source just as is done for the microphone used in the measurements, the limits of scatter about the mean value may be narrowed. The uncertainty of measuring the simple mean value still remains unsettled.
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Document Type: Research Article

Publication date: September 1, 1975

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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