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Iterative Bestimmung des Schallabsorptionsgrads aus der gemessenen Nachhallzeit beim Hallraumverfahren

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This paper presents a new method to determine the sound absorption coefficient of a test sample from the measured reverberation time. It consists in the iterative solution of the integral equation which governs the distribution of sound energy over the boundary during the decay process, the latter being assumed as exponential. In contrast to Sabine's formula as is usually applied, no requirements concerning the diffusivity of the sound field have to be met. It has to be assumed, however, that the walls reflect the sound energy not only specularly but scatter a certain fraction of it into nonspecular directions. Some results obtained for a cubical reverberation chamber are presented and discussed.

Zusammenfassung

In dieser Arbeit wird ein Iterationsverfahren zur Bestimmung des Schallabsorptionsgrads einer Testfläche aus der gemessenen Nachhallzeit angegeben. Es beruht auf der Integralgleichung für die Verteilung der Schallenergie auf die Raumwände während des als exponentiell vorausgesetzten Nachhallvorgangs. Im Gegensatz zur sonst angewandten Sabineschen Nachhallformel braucht dabei ein diffuses Schallfeld nicht vorausgesetzt zu werden, wohl aber, daß die Raumwände den auftreffenden Schall nicht nur geometrisch, sondern teilweise auch diffus reflektieren. Für einen angenommenen, kubischen Hallraum werden einige Rechenergebnisse vorgestellt und diskutiert.

Sommaire

Dans cet article, nous présentons une méthode itérative pour la détermination du coefficient d'absorption d'un échantillon test à partir de la mesure d'une durée de révérberation. La méthode est basée sur l'exploitation de l' équation intégrate exprimant la distribution de l' énergie acoustique sur les parois d'une salle au cours de l'extinction, que l'on suppose exponentielle. Contrairement à l'approche habituelle de la formule de Sabine, les conditions du champ diffus ne sont pas requises; il ne faut cependant pas que la réflexion sur les parois soit purement géométrique, mais qu'elle inclue une certaine dispersion. On présente et discute les résultats de calculs effectués pour le cas d'une salle réverbérante cubique.
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Document Type: Research Article

Publication date: September 1, 1995

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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