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Acoustically Similar Models as Auxiliary Means in Room Acoustics

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A model representing a room with a scale factor of 1:10, containing dry air, and provided with walls whose sound absorption coefficients at tenfold frequencies are equal to those of the original room at the lower frequencies, is geometrically and acoustically similar to the room. The sound field in the model is similar to that in the original room if the wavelength of the test sound radiated into the model room is reduced to one tenth by tenfold tape velocity. The sound field can be scanned with particular microphones and recorded on fast running tape, and by playing-back at low velocity the signal can be re-transposed into the audible range and then be judged.

A comparison of the “Meistersingerhalle” in Niirnberg with its acoustically similar model showed good agreement in such objective criteria as reverberation time, reflectograms, distinctness, and loudness level pattern. Furthermore, measurements of the syllable articulation score and the judgement of speech and music records by a group of blind listeners showed very good agreement also subjectively of the model with the original room. The technology of this procedure is now advanced to a state in which it may serve as a reliable auxiliary means for investigating problems in room acoustics.
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Document Type: Research Article

Publication date: January 1, 1967

More about this publication?
  • 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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