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Studies on diffusion of sound in a reverberation chamber

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Measurements of sound absorption coefficients of a standard material were carried out in a reverberation chamber at the Central Building Research Institute, Roorkee, to investigate the significance of diffusion of sound. It is well known that the sound absorption coefficient is very sensitive to changes in diffusion. An assessment of diffusion can be made by measuring the variation of sound absorption coefficient (within reasonable limits) with position of the test surface in the chamber. ISO recommendations were followed to achieve adequate diffusion by suspending a number of flat reflecting surfaces in a random fashion. Reasonable agreement with the ISO average value was obtained for the standard material Sillan. A comparison with the results from other laboratories is made on the basis of a constant ratio of the area of the diffusers to the area of the surface on which the material was mounted. In a static situation (where no moving objects are employed to provide diffusion) a random noise source gives less scatter of sound absorption coefficient with position compared to the same band width of warble tone.
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Document Type: Research Article

Publication date: January 1, 1964

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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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