Abstract
Knowledge of sound absorption properties of typical building materials is essential for all tasks
related to room acoustic design. The Sabine absorption coefficient is measured in a reverberation
chamber according to the international standard ISO 354. It is known that inter-laboratory
reproducibility of these results is poor, which leads to uncertainties in prediction and
nonconformity with building contracts. It is assumed that differences in the diffuse field
conditions between laboratories are the main cause of the poor reproducibility. Achieving a
diffuse sound field is the most important requirement for the reverberation chamber. Diffusing
elements are therefore typically installed in reverberation chambers. In this study, the effects of
hanging panel diffusers and hanging spherical volume diffusers on the diffusivity of the sound
field in a reverberation chamber are investigated. The sound field diffusivity is characterized
based on the equivalent sound absorption area of a highly sound absorptive sample and the diffuse
field factor, which is the ratio of the measured spatial standard variation of the reverberation time
to the theoretical spatial standard variation under diffuse field conditions. The results indicate that
the diffuse field factor, as a potential diffuse field indicator, is suitable for rough estimation of the
diffuse sound field conditions but does not constitute a reliable measure of the diffusivity in a
reverberation chamber.
Original language | English |
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Title of host publication | Proceedings of EuroNoise |
Number of pages | 6 |
Publication date | 2015 |
Publication status | Published - 2015 |
Event | EuroNoise 2015: 10th European Congress and Exposition on Noise Control Engineering - Maastrict, Netherlands Duration: 31 May 2015 → 3 Jun 2015 Conference number: 10 |
Conference
Conference | EuroNoise 2015 |
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Number | 10 |
Country/Territory | Netherlands |
City | Maastrict |
Period | 31/05/2015 → 03/06/2015 |