Finite difference time domain modeling of phase grating diffusion

Konrad Kowalczyk, Maarten Van Walstijn

Research output: Contribution to conferencePaper

1 Citation (Scopus)
337 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages1-4
Number of pages4
DOIs
Publication statusPublished - May 2010
EventCommunications, 4th International Symposium on Control and Signal Processing (ISCCSP) - Limassol, Cyprus
Duration: 01 May 201001 May 2010

Conference

ConferenceCommunications, 4th International Symposium on Control and Signal Processing (ISCCSP)
CountryCyprus
CityLimassol
Period01/05/201001/05/2010

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  • Cite this

    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