Modeling Frequency-Dependent Boundaries as Digital Impedance Filters in FDTD and K-DWM Room Acoustics Simulations


Autoria(s): Kowalczyk, Konrad; Van Walstijn, Maarten
Data(s)

01/07/2008

Resumo

A new method for modeling-frequency-dependent boundaries in finite-difference time-domain (FDTD) and Kirchhoff variable digital waveguide mesh (K-DWM) room acoustics simulations is presented. The proposed approach allows the direct incorporation of a digital impedance filter (DIF) in the Multidimensional (2D or 3D) FDTD boundary model of a locally reacting surface. An explicit boundary update equation is obtained by carefully constructing a Suitable recursive formulation. The method is analyzed in terms of pressure wave reflectance for different wall impedance filters and angles of incidence. Results obtained from numerical experiments confirm the high accuracy of the proposed digital impedance filter boundary model, the reflectance of which matches locally reacting surface (LRS) theory closely. Furthermore a numerical boundary analysis (NBA) formula is provided as a technique for an analytic evaluation of the numerical reflectance of the proposed digital impedance filter boundary formulation.

Identificador

http://pure.qub.ac.uk/portal/en/publications/modeling-frequencydependent-boundaries-as-digital-impedance-filters-in-fdtd-and-kdwm-room-acoustics-simulations(5da72970-d716-45b9-864e-99129dc813cb).html

Idioma(s)

eng

Direitos

info:eu-repo/semantics/closedAccess

Fonte

Kowalczyk , K & Van Walstijn , M 2008 , ' Modeling Frequency-Dependent Boundaries as Digital Impedance Filters in FDTD and K-DWM Room Acoustics Simulations ' Journal of the Audio Engineering Society , vol 56 , no. 7-8 , pp. 569-583 .

Palavras-Chave #/dk/atira/pure/subjectarea/asjc/2200/2201 #Engineering (miscellaneous) #/dk/atira/pure/subjectarea/asjc/3100/3102 #Acoustics and Ultrasonics
Tipo

article