Finite volume time domain room acoustics simulation under general impedance boundary conditions

Stefan Bilbao*, Brian Hamilton, Jonathan Botts, Lauri Savioja

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

In room acoustics simulation and virtualization applications, accurate wall termination is a perceptually crucial feature. It is particularly important in the setting of wave-based modeling of 3D spaces, using methods such as the finite difference time domain method or finite volume time domain method. In this paper, general locally reactive impedance boundary conditions are incorporated into a 3D finite volume time domain formulation, which may be specialized to the various types of finite difference time domain method under fitted boundary termination. Energy methods are used to determine stability conditions for general room geometries, under a large family of nontrivial wall impedances, for finite volume methods over unstructured grids. Simulation results are presented, highlighting in particular the need for unstructured or fitted cells at the room boundary in the case of the accurate simulation of frequency-dependent room mode decay times.

Original languageEnglish
Article number7327143
Pages (from-to)161-173
Number of pages13
JournalIEEE/ACM Transactions on Audio, Speech, and Language Processing
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Finite difference time domain method
  • finite volume methods
  • room acoustics
  • WAVE-GUIDE MESH
  • FDTD

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