TY - CONF
T1 - A Physically-Constrained Source Model For FDTD Acoustic Simulation
AU - Sheaffer, Jonathan
AU - Van Walstijn, Maarten
AU - Fazenda, Bruno
PY - 2012/9
Y1 - 2012/9
N2 - The Finite Difference Time Domain (FDTD) method is becoming increasingly popular for room acoustics simulation. Yet, the literature on grid excitation methods is relatively sparse, and source functions are traditionally implemented in a hard or additive formusing arbitrarily-shaped functions which do not necessarily obey the physical laws of sound generation. In this paper we formulatea source function based on a small pulsating sphere model. A physically plausible method to inject a source signal into the gridis derived from first principles, resulting in a source with a near-flat spectrum that does not scatter incoming waves. In the finaldiscrete-time formulation, the source signal is the result of passing a Gaussian pulse through a digital filter simulating the dynamics of the pulsating sphere, hence facilitating a physically correct means to design source functions that generate a prescribed sound field.
AB - The Finite Difference Time Domain (FDTD) method is becoming increasingly popular for room acoustics simulation. Yet, the literature on grid excitation methods is relatively sparse, and source functions are traditionally implemented in a hard or additive formusing arbitrarily-shaped functions which do not necessarily obey the physical laws of sound generation. In this paper we formulatea source function based on a small pulsating sphere model. A physically plausible method to inject a source signal into the gridis derived from first principles, resulting in a source with a near-flat spectrum that does not scatter incoming waves. In the finaldiscrete-time formulation, the source signal is the result of passing a Gaussian pulse through a digital filter simulating the dynamics of the pulsating sphere, hence facilitating a physically correct means to design source functions that generate a prescribed sound field.
M3 - Paper
T2 - 15th International Conference on Digital Audio Effects Conference (DAFx-12)
Y2 - 17 September 2012 through 21 September 2012
ER -