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On the Preferred Reverberation Time in Auditoriums

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Subjective preference judgements for sound fields simulated by the aid of a computer with various combinations of early reflections and subsequent reverberation were conducted.

Results show that the most preferred reverberation time can be calculated by using the autocorrelation function (ACF) of source signals which may be regarded as a kind of “reverberation“ being contained within themselves.

Also, it is reconfirmed that the most preferred initial time delay (or scale factor for the dimension of rooms) for each total amplitude of both early reflections and the subsequent reverberation can be determined by the ACF.

Zusammenfassung

Subjektive Beurteilungen von Schallfeldern, welche mit Hilfe eines Rechners bei verschiedenen Kombinationen von frühen Reflexionen und folgendem Nachhall simuliert wurden, werden vorgestellt.

Die Ergebnisse zeigen, daß die am meisten bevorzugte Nachhallzeit berechnet werden kann unter Verwendung der Autokorrelationsfunktion (ACF) des Quellensignals, welches als eine Ait von in sich selbst enthaltenen Nachhall angesehen werden kann.

Außerdem ist bestätigt, daß die am stärksten bevorzugte Anfangszeitverzögerung (Skalierungsfaktor für die Größe des Raumes) für die Gesamtamplituden sowohl der früheren Reflexionen als auch des folgenden Nachhalls aus der ACF bestimmt werden kann.

Sommaire

On a effectué des tests de préférence subjective portant sur des champs sonores synthétisés par ordinateur, avec simulation de la réverbération par intervention de diverses combinaisons de trains d'ondes réfléchis à délais brefs.

Les résultats obtenus montrent que les durées de réverbération qui ont recueilli le plus de suffrages peuvent se calculer simplement à partir de la fonction d'autocorrélation des signaux initiaux, comme si une sorte de réverbération était contenue déjà dans le signal à la source.

On a également pu confirmer le fait qu'il est possible de déduire de cette fonction d'autocorrélation les valeurs préférées du retard de la première réflexion (qui équivaut au facteur d'échelle pour la dimension de la salle) en fonction de l'amplitude totale de l'ensemble des signaux réverbérés.
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Document Type: Research Article

Publication date: February 1, 1982

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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