Time-Domain Simulation of Directive Sources in 3-D Digital Waveguide Mesh-Based Acoustical Models

Hacıhabiboğlu, Hüseyin; Günel, Banu; Kondoz, A.M.

doi:10.1109/tasl.2008.921759

Cited by 14 publications

(12 citation statements)

References 38 publications

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“…Pressure derivative evaluation In order to produce spatial sound, we need to determine the coefficients of the plane wave decomposition using pressure derivatives (Equation 8). The first-order derivative of the pressure field due to elementary source ∂ p lm (x)/∂ x is computed by differentiating the functions involved analytically:…”

Section: Boundary Element Methods (Bem)mentioning

confidence: 99%

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Source and Listener Directivity for Interactive Wave-Based Sound Propagation

Mehra

Antani

Kim

et al. 2014

IEEE Trans. Visual. Comput. Graphics

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We present an approach to model dynamic, data-driven source and listener directivity for interactive wave-based sound propagation in virtual environments and computer games. Our directional source representation is expressed as a linear combination of elementary spherical harmonic (SH) sources. In the preprocessing stage, we precompute and encode the propagated sound fields due to each SH source. At runtime, we perform the SH decomposition of the varying source directivity interactively and compute the total sound field at the listener position as a weighted sum of precomputed SH sound fields. We propose a novel plane-wave decomposition approach based on higher-order derivatives of the sound field that enables dynamic HRTF-based listener directivity at runtime. We provide a generic framework to incorporate our source and listener directivity in any offline or online frequency-domain wave-based sound propagation algorithm. We have integrated our sound propagation system in Valve's Source game engine and use it to demonstrate realistic acoustic effects such as sound amplification, diffraction low-passing, scattering, localization, externalization, and spatial sound, generated by wave-based propagation of directional sources and listener in complex scenarios. We also present results from our preliminary user study.

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Section: Boundary Element Methods (Bem)mentioning

confidence: 99%

“…Interactive wave-based sound propagation techniques [28,16] can handle elementary directional sources such as monopoles, dipoles, quadrupoles, and their linear combinations. Other techniques have been proposed to incorporate measured directivities in wave-based techniques [8,30].…”

Section: Prior Workmentioning

confidence: 99%

Source and Listener Directivity for Interactive Wave-Based Sound Propagation

Mehra

Antani

Kim

et al. 2014

IEEE Trans. Visual. Comput. Graphics

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show abstract

“…Interactive wave-based sound propagation techniques [26] can handle elementary directional sources such as monopoles, dipoles, quadrupoles, and their linear combinations. Other techniques have been proposed to incorporate measured directivities in wave-based techniques [11]. But the source directivity is modeled during the offline simulation stage and its directivity effects on the sound propagation gets baked into the simulation results.…”

Section: Directional Sourcesmentioning

confidence: 99%

Wave-based sound propagation for VR applications

Mehra

Manocha

2014

2014 IEEE VR Workshop: Sonic Interaction in Virtual Environments (SIVE)

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Figure 1: The equivalent source technique accurately models realistic acoustic effects, such as diffraction, scattering, focusing, and echoes, in large, open scenes. It reduces the runtime memory usage by orders of magnitude compared to state-of-the-art wave solvers, enabling real-time, wave-based sound propagation in scenes spanning hundreds of meters: a) reservoir scene (Half-Life 2), b) Christmas scene, and c) desert scene. AbstractRealistic sound effects are extremely important in VR to improve the sense of realism and immersion. It augments the visual sense of the user and can help reduce simulation fatigue. Sound can provide 3D spatial cues outside field of view and help create high-fidelity VR training simulations. Current sound propagation techniques are based on heuristic approaches or simple line of sight-based geometric techniques. These techniques cannot capture important sound effects such as diffraction, interference, focusing. For VR applications, there is a need for high-fidelity, accurate sound propagation. In order to model sound propagation accurately, it is important to develop interactive wave-based propagation techniques. We present a set of efficient approaches to model wave-based sound propagation for VR applications that can handle large scenes, directional sound sources, and generate spatial sound, for a moving listener. Our technique has been integrated in Valve's Source game engine and we use it to demonstrate realistic acoustic effects such as diffraction, high-order reflection, interference, directivity, and spatial sound, in complex scenarios.

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“…Similar source formulations can be found in the closely related simulation paradigm of digital waveguide modeling. 14,15 One advantage of HS over SS excitation is that it allows a more precise control of the outward propagating pressure wave, which facilitates various modeling aims, such as field visualization and response analysis. 16 However, unlike with soft sources, waves propagating back to the source reflect from a hard source node, 17 effectively imposing a severe limit on the available time window.…”

Section: Introductionmentioning

confidence: 99%

Physical and numerical constraints in source modeling for finite difference simulation of room acoustics

Sheaffer

Walstijn

Fazenda

2014

The Journal of the Acoustical Society of America

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In finite difference time domain simulation of room acoustics, source functions are subject to various constraints. These depend on the way sources are injected into the grid and on the chosen parameters of the numerical scheme being used. This paper addresses the issue of selecting and designing sources for finite difference simulation, by first reviewing associated aims and constraints, and evaluating existing source models against these criteria. The process of exciting a model is generalized by introducing a system of three cascaded filters, respectively, characterizing the driving pulse, the source mechanics, and the injection of the resulting source function into the grid. It is shown that hard, soft, and transparent sources can be seen as special cases within this unified approach. Starting from the mechanics of a small pulsating sphere, a parametric source model is formulated by specifying suitable filters. This physically constrained source model is numerically consistent, does not scatter incoming waves, and is free from zero-and low-frequency artifacts. Simulation results are employed for comparison with existing source formulations in terms of meeting the spectral and temporal requirements on the outward propagating wave.

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Time-Domain Simulation of Directive Sources in 3-D Digital Waveguide Mesh-Based Acoustical Models

Cited by 14 publications

References 38 publications

Source and Listener Directivity for Interactive Wave-Based Sound Propagation

Source and Listener Directivity for Interactive Wave-Based Sound Propagation

Wave-based sound propagation for VR applications

Physical and numerical constraints in source modeling for finite difference simulation of room acoustics

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