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The Effects of Adding Pyramidal and Convex Diffusers on Room Acoustic Parameters in a Small Non-Diffuse Room

by Hassan Azad 1,*,†, Julie Meyer 2,†, Gary Siebein 1 and Tapio Lokki 2
1
School of Architecture, University of Florida, Gainesville, FL 32611, USA
2
Department of Computer Science, Aalto University, FI-02150 Espoo, Finland
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Acoustics 2019, 1(3), 618-643; https://doi.org/10.3390/acoustics1030037
Received: 23 June 2019 / Revised: 19 July 2019 / Accepted: 24 July 2019 / Published: 2 August 2019
This paper presents an investigation of the effects of relatively large-scale pyramidal and convex-shaped diffusers on the acoustical properties of a small non-diffuse rectangular room. Room impulse responses (RIRs) were measured in various room configurations to extract the early decay time (EDT), reverberation time (T20), early-to-late arriving sound ratio (C50), and clarity (C80). The difference between the parameters measured in the empty room were chosen to be the reference, and those measured in other room configurations was calculated. Statistical analysis of the measurement results supplements the investigation to determine whether the coverage and type of diffusers contribute significantly to the variation of the acoustical parameters. The results show that adding diffusers in the room generally decreases EDT as well as T20, and increases C50 as well as C80 for both diffuser types. The statistical analysis shows that the coverage of diffusers significantly contributes to the variation of the acoustical parameters in most conditions (octave band, diffuser type). The effect of the diffuser shape is only significant for some of the conditions (at 4 kHz, the number of diffusers). The data presented demonstrate that in a small non-diffuse room the reverberation can be controlled efficiently by redirecting the sound energy towards the most absorbing surfaces. View Full-Text
Keywords: pyramidal diffuser; convex diffuser; non-diffuse room; acoustical parameters pyramidal diffuser; convex diffuser; non-diffuse room; acoustical parameters
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Azad, H.; Meyer, J.; Siebein, G.; Lokki, T. The Effects of Adding Pyramidal and Convex Diffusers on Room Acoustic Parameters in a Small Non-Diffuse Room. Acoustics 2019, 1, 618-643.

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