3D interpolation in wave-based acoustic simulation

Stefan Bilbao*

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract / Description of output

In any acoustics simulation setting relying on computation over a spatial grid, interpolation of the acoustic field is essential in order to accurately model source and receiver positions. Most available approaches to 3D interpolation, such as those used in computer graphics or medical imaging, are based on polynomial or windowed-sinc designs. In this short contribution, it is shown that highly accurate optimised designs are available if particular features of acoustic wave propagation and numerical scheme design are incorporated: performance can be tuned to an acoustic wavenumber range of interest, taking into account numerical dispersion artefacts, and the interdependence of the solution to the acoustic wave equation at neighbouring time steps can be further exploited, leading to extremely compact locally-defined interpolation designs. Numerical results are presented.
Original languageEnglish
Pages (from-to)384-388
Number of pages5
JournalIEEE Signal Processing Letters
Volume29
DOIs
Publication statusPublished - 23 Dec 2021

Keywords / Materials (for Non-textual outputs)

  • FDTD
  • finite difference time domain method
  • 3D interpolation
  • room acoustics
  • wave-based simulation

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