In this paper, a method for modeling diffusion caused by non-smooth boundary surfaces in simulations of room acoustics using finite difference time domain (FDTD) technique is investigated. The proposed approach adopts the well-known theory of phase grating diffusers to efficiently model sound scattering from rough surfaces. The variation of diffuser well-depths is attained by nesting allpass filters within the reflection filters from which the digital impedance filters used in the boundary implementation are obtained. The presented technique is appropriate for modeling diffusion at high frequencies caused by small surface roughness and generally diffusers that have narrow wells and infinitely thin separators. The diffusion coefficient was measured with numerical experiments for a range of fractional Brownian diffusers.
|Number of pages||4|
|Publication status||Published - May 2010|
|Event||Communications, 4th International Symposium on Control and Signal Processing (ISCCSP) - Limassol, Cyprus|
Duration: 01 May 2010 → 01 May 2010
|Conference||Communications, 4th International Symposium on Control and Signal Processing (ISCCSP)|
|Period||01/05/2010 → 01/05/2010|
Kowalczyk, K., & Van Walstijn, M. (2010). Finite difference time domain modeling of phase grating diffusion. 1-4. Paper presented at Communications, 4th International Symposium on Control and Signal Processing (ISCCSP), Limassol, Cyprus. https://doi.org/10.1109/ISCCSP.2010.5463366