Modelling Room Reverberation Directivity using von Mises-Fisher Mixture Distribution

Sound propagation in a reverberation room.

 Room reverberation can be a beneficial phenomenon in imparting a sense of acoustical space to perceived sound, but it can also cause spectral distortions if uncontrolled. Reverberation modelling is necessary to understand the complex behaviour of the reflected soundfield in any enclosure to facilitate efficient control designs. This seminar introduces a novel approach to room reverberation analysis based on the angular power distribution model of the reverberant field developed using a von Mises-Fisher (vMF) mixture function. The statistical features of the complex reverberant power distribution convey the directional strength of inhomogeneous room reflections. The model is primarily designed for directivity study and helps in encapsulating the extensive raw data into a convenient set of parameters of the density function. Initially, the reverberant field power values are determined using the spatial correlation model in the spherical harmonics domain. The proposed technique transforms this data into directional power vectors to estimate the parameters of a convex vMF mixture function. A power distribution model is generated from these parameters to represent the directional characteristics of room reverberation. This seminar briefly discusses the mathematical background of the model and presents its performance evaluation for a test room.



Amy Bastine is a Ph.D. student working with the Audio and Acoustic Signal Processing Group at the College of Engineering and Computer Science, ANU. She received Master of Engineering degree in Digital Systems & Telecommunications from ANU in December 2019. Her research focuses on room acoustics and reverberation modelling.


Date & time

1–2pm 25 Nov 2020


Zoom link: Password: AASP

Internal speakers

Ms Amy Bastine

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