Conference_programme: 18.6 - Acoustics of reverberation chambers
Lecture: Energy decay curves in reverberation chambers and the influence of scattering objects on the absorption coefficient of a sample
Author(s): Balint Jamilla , Nolan Mélanie, Jeong Cheol-Ho, Muralter Florian
Summary:
This work deals with the multi-exponential nature of energy decay curves in reverberation chambers. Impulse response measurements have been carried out with different room and sample configurations to investigate the effect of scattering elements and the position of the absorber on the slopes of the energy decay curve and the absorption coefficient. In this context Annex D of ISO 354 is discussed also. The reverberation time is calculated by fitting a sum of exponential model to the data instead of using conventional parameters obtained with linear regression. The absorption coefficient is calculated with the reverberation time obtained from the initial part of the energy decay. With this method high values of the absorption coefficient are reached already without any scattering objects in the chamber. The results are compared with theoretically obtained values considering the size effect.
Corresponding author
Name: Ms Jamilla Balint
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Austria
