Abstract
This study presents a kurtosis analysis of room impulse responses as a potential room
diffuseness measure. In the early part of an impulse response, sound pressure samples do not
constitute a Gaussian distribution due to the direct sound and strong reflections. Such
deterministic reflections are extreme events, which prevent the pressure samples from being
normally distributed, leading to a high kurtosis. As the reflections are sparser and stronger, the
sound field becomes less diffuse and the kurtosis systematically increases, indicating that it can
be used as a diffuseness measure. The kurtosis converges to zero, as the reflection overlap
becomes heavier, which is an important condition for a perfect diffuse field. Two rooms are
analyzed. A small rectangular room shows that a non-uniform surface absorption distribution
tends to increase the kurtosis significantly. A full scale reverberation chamber is also tested with
many different diffuser settings. Results show that the kurtosis from a broad band impulse
response has a good correlation with the equivalent absorption coefficient according to ISO 354.
diffuseness measure. In the early part of an impulse response, sound pressure samples do not
constitute a Gaussian distribution due to the direct sound and strong reflections. Such
deterministic reflections are extreme events, which prevent the pressure samples from being
normally distributed, leading to a high kurtosis. As the reflections are sparser and stronger, the
sound field becomes less diffuse and the kurtosis systematically increases, indicating that it can
be used as a diffuseness measure. The kurtosis converges to zero, as the reflection overlap
becomes heavier, which is an important condition for a perfect diffuse field. Two rooms are
analyzed. A small rectangular room shows that a non-uniform surface absorption distribution
tends to increase the kurtosis significantly. A full scale reverberation chamber is also tested with
many different diffuser settings. Results show that the kurtosis from a broad band impulse
response has a good correlation with the equivalent absorption coefficient according to ISO 354.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 22nd International Congress on Acoustics |
| Number of pages | 10 |
| Publication date | 2016 |
| Publication status | Published - 2016 |
| Event | 22nd International Congress on Acoustics : Acoustics for the 21st century - Catholic University of Argentina, Buenos Aires, Argentina Duration: 5 Sep 2016 → 9 Sep 2016 http://ica2016.org.ar/ |
Conference
| Conference | 22nd International Congress on Acoustics |
|---|---|
| Location | Catholic University of Argentina |
| Country/Territory | Argentina |
| City | Buenos Aires |
| Period | 05/09/2016 → 09/09/2016 |
| Internet address |
Keywords
- Diffuse sound field
- Diffuseness
- Kurtosis
- ISO 354