Efficient HRTF-based Spatial Audio for Area and Volumetric Sources

IEEE Transactions on Visualization and Computer Graphics
Carl SchisslerRavish Mehra

Abstract

We present a novel spatial audio rendering technique to handle sound sources that can be represented by either an area or a volume in VR environments. As opposed to point-sampled sound sources, our approach projects the area-volumetric source to the spherical domain centered at the listener and represents this projection area compactly using the spherical harmonic (SH) basis functions. By representing the head-related transfer function (HRTF) in the same basis, we demonstrate that spatial audio which corresponds to an area-volumetric source can be efficiently computed as a dot product of the SH coefficients of the projection area and the HRTF. This results in an efficient technique whose computational complexity and memory requirements are independent of the complexity of the sound source. Our approach can support dynamic area-volumetric sound sources at interactive rates. We evaluate the performance of our technique in large complex VR environments and demonstrate significant improvement over the naive point-sampling technique. We also present results of a user evaluation, conducted to quantify the subjective preference of the user for our approach over the point-sampling approach in VR environments.

References

Jan 21, 2000·The Journal of the Acoustical Society of America·E H Langendijk, A W Bronkhorst
Apr 6, 2007·The Journal of the Acoustical Society of America·Dylan Menzies, Marwan Al-Akaidi
Feb 9, 2010·The Journal of the Acoustical Society of America·Boaz Rafaely, Amir Avni
Mar 22, 2014·IEEE Transactions on Visualization and Computer Graphics·Ravish MehraDinesh Manocha

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Citations

May 3, 2019·The Journal of the Acoustical Society of America·Fabian BrinkmannStefan Weinzierl

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