Priority‐Driven Acoustic Modeling for Virtual Environments

Min, Patrick

doi:10.1111/1467-8659.00410

Cited by 19 publications

(12 citation statements)

References 33 publications

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“…Over the decades, there has been a significant amount of research on geometric methods, which only differ from each other in the way sound propagation is approximated. Some salient examples are, the image source method [Allen and Berkley 1979], ray-tracing [Krockstadt 1968], beam-tracing [Min and Funkhouser 2000;Tsingos et al 2001;Funkhouser et al 2003;Funkhouser et al 2004;Antonacci et al 2004], or phonontracing [Bertram et al 2005;Deines et al 2006]. …”

Section: Geometric Methodsmentioning

confidence: 99%

Accelerated wave-based acoustics simulation

Raghuvanshi

Galoppo

2008

Proceedings of the 2008 ACM Symposium on Solid and Physical Modeling

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We present an efficient technique to model sound propagation accurately in an arbitrary 3D scene by numerically integrating the wave equation. We show that by performing an offline modal analysis and using eigenvalues from a refined mesh, we can simulate sound propagation with reduced dispersion on a much coarser mesh, enabling accelerated computation. Since performing a modal analysis on the complete scene is usually not feasible, we present a domain decomposition approach to drastically shorten the pre-processing time. We introduce a simple, efficient and stable technique for handling the communication between the domain partitions. We validate the accuracy of our approach against cases with known analytical solutions. With our approach, we have observed up to an order of magnitude speedup compared to a standard finite-difference technique.

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Section: Geometric Methodsmentioning

confidence: 99%

Accelerated wave-based acoustics simulation

Raghuvanshi

Galoppo

2008

Proceedings of the 2008 ACM Symposium on Solid and Physical Modeling

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“…Many CG-related studies address such implementations in real time. Procedures have been described for applying the beam tracing method [20][21][22][23][24] and managing acoustic sources by employing clustering [25].…”

Section: Related Researchmentioning

confidence: 99%

Generating Spark Discharge Sound for Interactive Animation using WM-wave

Matsuyama

Fujimoto

Chiba

2008

The Journal of the Society for Art and Science

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A technology for automatically creating and adding sound to interactive CG animations of spark discharges in an efficient way has been developed. In the procedure proposed in this paper, the user inputs the electric charge distribution, boundary conditions and other parameters affecting the initiation of electric discharges in virtual space. The animation of the discharge is then created by generating and rendering the profile of the discharge pattern. The sound synchronized with the animation is automatically generated in an efficient way. The noises generated by spark discharges are shock waves, which exhibit complicated behavior; however, in this study, an empirical profile for a shock wave is employed to efficiently generate the acoustic waveform. Effective procedures for expressing lightning discharges and continuous discharges are also proposed. In this paper, we present the details of our technique and demonstrate its effect and efficiency by giving many experimental examples. We investigated the parameters and waveforms employed in this study to demonstrate the validity of this procedure.

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“…Although there are generally exponentially many distinct sequences of diffraction through a 3D polyhedral scene, we expect a large number of them to be psychoacoustically insignificant (the amplitude of diffracted contributions quickly drops with the diffraction order), and thus beams are traced in priority order [28], either during an off-line precomputation (as in [12]) or in real-time using multiple asynchronous processes (as in [13]). …”

Section: Beam Construction and Tracingmentioning

confidence: 99%

Modeling acoustics in virtual environments using the uniform theory of diffraction

Tsingos

Ngan

Carlbom

2001

Proceedings of the 28th Annual Conference on Computer Graphics and Interactive Techniques

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152

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Realistic modeling of reverberant sound in 3D virtual worlds provides users with important cues for localizing sound sources and understanding spatial properties of the environment. Unfortunately, current geometric acoustic modeling systems do not accurately simulate reverberant sound. Instead, they model only direct transmission and specular reflection, while diffraction is either ignored or modeled through statistical approximation. However, diffraction is important for correct interpretation of acoustic environments, especially when the direct path between sound source and receiver is occluded.The Uniform Theory of Diffraction (UTD) extends geometrical acoustics with diffraction phenomena: illuminated edges become secondary sources of diffracted rays that in turn may propagate through the environment. In this paper, we propose an efficient way for computing the acoustical effect of diffraction paths using the UTD for deriving secondary diffracted rays and associated diffraction coefficients. Our main contributions are: 1) a beam tracing method for enumerating sequences of diffracting edges efficiently and without aliasing in densely occluded polyhedral environments; 2) a practical approximation to the simulated sound field in which diffraction is considered only in shadow regions; and 3) a real-time auralization system demonstrating that diffraction dramatically improves the quality of spatialized sound in virtual environments.

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Priority‐Driven Acoustic Modeling for Virtual Environments

Cited by 19 publications

References 33 publications

Accelerated wave-based acoustics simulation

Accelerated wave-based acoustics simulation

Generating Spark Discharge Sound for Interactive Animation using WM-wave

Modeling acoustics in virtual environments using the uniform theory of diffraction

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