Diffraction by a right-angled impedance wedge: An edge source formulation

Hewett, David P.

doi:10.1121/1.4906265

Cited by 4 publications

(1 citation statement)

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“…Finite objects generate higher orders of diffraction waves, which may be computationally challenging to render. Explicit expressions for edge diffraction waves are available only for rigid surfaces, and a few other special cases (Hewett and Morris, 2015). (4) Surface scattering, or diffuse reflection, results when a reflecting surface is not smooth, but rough.…”

Section: A Acoustic Scattering Phenomenamentioning

confidence: 99%

Machine-learning-based estimation and rendering of scattering in virtual reality

Pulkki

Svensson

2019

The Journal of the Acoustical Society of America

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In this work, a technique to render the acoustic effect of scattering from finite objects in virtual reality is proposed, which aims to provide a perceptually plausible response for the listener, rather than a physically accurate response. The effect is implemented using parametric filter structures and the parameters for the filters are estimated using artificial neural networks. The networks may be trained with modeled or measured data. The input data consist of a set of geometric features describing a large quantity of source-object-receiver configurations, and the target data consist of the filter parameters computed using measured or modeled data. A proof-of-concept implementation is presented, where the geometric descriptions and computationally modeled responses of three-dimensional plate objects are used for training. In a dynamic test scenario, with a single source and plate, the approach is shown to provide a similar spectrogram when compared with a reference case, although some spectral differences remain present. Nevertheless, it is shown with a perceptual test that the technique produces only a slightly lower degree of plausibility than the state-of-the-art acoustic scattering model that accounts for diffraction, and also that the proposed technique yields a prominently higher degree of plausibility than a model that omits diffraction.

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Section: A Acoustic Scattering Phenomenamentioning

confidence: 99%