Binaural reproduction of time-domain spectral element method simulations using spherical harmonic spatial encoding

Anastasios Galanopoulos, Finnur Pind, Hermes Sampedro Llopis, Cheol-Ho Jeong

    Research output: Contribution to journalConference abstract in journalResearchpeer-review

    Abstract

    In room acoustic simulations and virtual acoustics, incorporating listener's directivity is crucial for achieving listener's immersion into the simulated sound field and enabling sound localization. Two techniques are presented for extracting spatially encoded signals around a receiver location in a wave-based spectral element method (SEM) numerical scheme. Both are based on the relation between spherical harmonic encoding and the sound field's local pressure gradients. In the first technique, the encoding equations are solved by employing local finite differences incorporated into the SEM scheme. In the second, an SEM numerical discretization of the encoding equations is derived through the weak formulation of the encoding equations and solved inherently in the SEM scheme. Binaural responses areproduced by convolving the computed wave amplitude density with a head-related transfer function. Numerical results from the two techniques are presented, and an excellent agreement is found with finite-difference time-domain simulations. The encoded signal's accuracy in the two SEM techniques is analyzed in terms of the resolution of the numerical discretization. The receiver directivity models run locally, in the time domain, and support interactive auralization with moving and rotating receivers.
    Original languageEnglish
    JournalJournal of the Acoustical Society of America
    Volume149
    Issue numberA20
    ISSN0001-4966
    DOIs
    Publication statusPublished - 2021

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