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A physically-constrained source model for FDTD acoustic simulation

Sheaffer, J, Walstijn, MV and Fazenda, BM 2012, A physically-constrained source model for FDTD acoustic simulation , in: 15th International Conference on Digital Audio Effects (DAFx-12), 17th - 21st September 2012, York, UK. (Submitted)

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    Abstract

    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 form using arbitrarily-shaped functions which do not necessarily obey the physical laws of sound generation. In this paper we formulate a source function based on a small pulsating sphere model. A physically plausible method to inject a source signal into the grid is derived from first principles, resulting in a source with a near- flat spectrum that does not scatter incoming waves. In the final discrete-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.

    Item Type: Conference or Workshop Item (Paper)
    Themes: Built and Human Environment
    Media, Digital Technology and the Creative Economy
    Schools: Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Journal or Publication Title: Proc. of the 15th Int. Conference on Digital Audio Effects (DAFx-12)
    Refereed: Yes
    Depositing User: BM Fazenda
    Date Deposited: 24 Jul 2012 09:25
    Last Modified: 20 Aug 2013 18:29
    URI: http://usir.salford.ac.uk/id/eprint/23028

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