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An Improved Reverberation Formula

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A new formula of the reverberation time is deduced taking into account the nonuniform distribution of absorption case in rooms. The formula is confirmed by an experimental analysis, that we present on the graphical recordings comparing our results with those of Eyring and Fitzroy.

Also we introduce in this paper a study of the effects of area and location of the absorbing material in a room. The results obtained with the new formula are in good agreement with the experimental measurements of Young, Knudsen and others.


Es wird eine neue Formel für die Nachhallzeit abgeleitet, welche die ungleichförmige Verteilung der Absorption in Räumen berücksichtigt. Die Formel wird durch eine experimentelle Untersuchung bestätigt in der unsere Ergebnisse mit denen von Eyring und Fitzroy verglichen werden.

In dieser Arbeit werden weiterhin die Einflüsse der Fläche und Lage absorbierender Materialien im Raum untersucht. Die Ergebnisse, die mit der neuen Formel erhalten werden, stehen in guter Übereinstimmung mit Meßdaten von Young, Knudsen und anderen.


On présente une formule nouvelle donnant la durée de la réverbération du son dans une salle garnie d'une répartition non-uniforme de panneaux absorbants. La validité de la formule est controlée par une analyse expérimental traduite en enregistrements graphiques où ses résultats sont comparés avec ceux des formules d'Eyring et de Fitzroy.

Dans le même article on développe une étude des effets de la situation et des dimensions des matériaux absorbants disposés dans la salle sur la durée de la réverbération. Les prévisions de la nouvelle formule se trouvent en bon accord avec les résultats expérimentaux de divers auteurs, et notamment avec ceux de Young et de Knudsen.
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Document Type: Research Article

Publication date: 1988-03-01

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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