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Ein neuer Hallraum für Sdiallwellen und elektromagnetisdie Wellen

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The new reverberation room of the III. Physikalisches Institut, University of Gottingen, has a volume of 342 m3. This room is reverberant for acoustical waves as well as for electromagnetic waves.

The acoustical reverberation time of the room is 33 s at 100 c/s and 13 s at 1000 c/s. In order to obtain a high degree of diffusity 24 scattering objects — bent Plexiglas plates with 2 m2 surface — are suspended in the room. Parallel walls are avoided by small deviations from the square shape. The expediency of these measures was proved in a number of preliminary model experiments. It was tried to obtain a high degree of sound insulation by using double walls; for the same reason the inner structure of the room is supported on steel springs. The sound insulation thus attained is about 80 dB.

The entire surface of the room is coated with copper foil. The reverberation time for electromagnetic waves is 400 μs at 10 kMc/s corresponding to a quality of 1,7 × 106. No scattering objects are used in this case.
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Document Type: Research Article

Publication date: January 1, 1960

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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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