University Of Tasmania
Henham et al Acoustics 2016 paper157.pdf (1.84 MB)
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Broadband acoustic scattering with modern aesthetics from random 3D terrain surfaces generated using the Fourier Synthesis algorithm

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conference contribution
posted on 2023-05-23, 11:53 authored by Henham, W, Damien HollowayDamien Holloway, Lilyan Panton
Acoustic diffusers are designed to scatter sound to create diffuse sound fields, ideally providing a uniform acoustic experience over a broad frequency range within a listening space. Standard diffuser designs, such as Schroeder diffusers, while effective, may be considered by some to have a design aesthetic that does not conform to particular architectural styles. In this paper the Fourier Synthesis algorithm for procedural 3D random terrain generation is investigated as an alternative for diffuser surface geometry, providing scattering in two dimensions, and scope to vary the bandwidth through a surface smoothness parameter. The scattering properties of a prototype diffuser are investigated experimentally and through numerical modelling using a boundary element method (BEM) program called FastBEM. Good agreement between these is achieved, providing solid validation of the numerical model from which the performance of the diffuser can be assessed. The scattering properties are quantified using polar plots, 3D plots, and the diffusion coefficient. As expected, the Fourier Synthesis diffuser provides good diffusion when the wavelength of the incident sound is comparable to the wavelength of periodicity of the diffuser geometry. A preliminary investigation into the performance of the diffuser for various levels of surface roughness is made, showing that high diffusion can be extended to higher frequencies by increasing the surface roughness of the diffuser.


Publication title

Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies Conference


IDM Hillock & DJ Mee






Tasmanian Institute of Agriculture (TIA)


Australasian Acoustical Societies

Place of publication


Event title

Acoustics 2016: The Second Australasian Acoustical Societies Conference

Event Venue

Brisbane, Australia

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Date of Event (End Date)


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  • Open

Socio-economic Objectives

Expanding knowledge in engineering

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    University Of Tasmania