The potential for finite difference time domain in room acoustics

• Autores: Javier Redondo Pastor, Rubén Picó, Mark Avis
• Localización: Proceedings of the ISRA 2007 Seville, Vol. 3, 2008 (Oral Session Communications), ISBN 9788469082676
• Idioma: español
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• Resumen

  • Since the invention of sound diffusers three decades ago a substantial effort has been made to predict the acoustic behaviour of these structures in response to the large costs inherent in anechoic measurements. Volumetric methods such as Finite Element Methods (FEM) or the Finite Difference Time Domain method (FDTD) are not often used, due to their large computational cost. However Near Field to Far Field Transformations (NFFFT) can overcome that problem. The main advantages of the FDTD method are that a single calculation is sufficient to study a wide frequency band, and that the time domain behaviour of the reflected sound can be directly inspected. On the other hand the inclusion of the well separators vibration can be made in a straightforward way, in order to estimate its significance on the scattering provided by diffusers. Additionally, active elements can be easily introduced in the simulation in order to evaluate directly the performance of an active diffuser. In the present paper we estimate the potential of FDTD to predict the acoustic behaviour of sound diffusers.