Why can the absorption coefficient be greater than one? How to deal with reference absorbers
* Presenting author
Abstract:
Sound absorption is the most important input factor to room acoustic calculations. The measurement of diffuse sound absorption is carried out in accordance to ISO 354, unfortunately the measured values are not as accurate as the planner would like. The ISO 354 is currently being revised, with a variety of approaches to improv the accuracy of the measurement.Sound absorption can not only be measured, but also calculated. In particular, the combination of calculation and measurement of normal incidence absorption provides an exact prediction of a perfectly diffuse absorption, just as it is used in a planning due to Sabine's equation.Therefore, the aim should be to modify the reverberation chamber in such a way that the theoretically known, perfectly diffuse, sound absorption of a reference absorber is also measured in the reverberation chamber, further corrections are obsolete.