A novel method for modeling frequency-dependent boundaries in finite-difference time-domain (FDTD) room acoustic simulations offers a significant improvement over the conventional one-dimensional approach. The method incorporates a digital impedance filter resulting in multidimensional formulation. Reflecting sound waves approximate the theoretical reflectance for any value of wall impedance and angle of incidence, especially at low frequencies. Both phase and amplitude are preserved. Results obtained from numerical experiments confirm the validity of the approach.

Authors: Kowalczyk, Konrad; Walstijn, Maarten van
Affiliation: Sonic Arts Research Centre (SARC), School of Electronics, Electrical Engineering and Computer Science, Queen’s University, Belfast, UK
JAES Volume 56 Issue 7/8 pp. 569-583; July 2008
Publication Date: August 21, 2008

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