![]() ![]() Furthermore, we observe 37% to 130% improvement in accuracy over a state-of-the-art localization method that does not model diffraction effects, especially when a sound source is not visible to the robot. In our tested cases, our approach can localize a source position with an average accuracy error, 0.7m, measured by the L2 distance between estimated and actual source locations in a 7m*7m*3m room. We have evaluated our algorithm in multiple scenarios consisting of a static and dynamic NLOS sound source. ![]() Our method identifies the convergence region of those generated acoustic rays as the estimated source position based on a particle filter. We precompute the wedges of a reconstructed mesh of an indoor scene and use them to generate diffraction acoustic rays to localize the 3D position of the source. is most apparent when the size of the obstacle or opening (a) and the wavelength of the wave () are of the same order (a ).A shadow is a region behind an obstacle into which a wave does not easily diffract. We combine a ray tracing based sound propagation algorithm with a Uniform Theory of Diffraction (UTD) model, which simulate bending effects by placing a virtual sound source on a wedge in the environment. is the bending or spreading of a wave around an obstacle or through an opening. Our approach exploits the diffraction properties of sound waves as they bend around a barrier or an obstacle in the scene. Lett.Download a PDF of the paper titled Diffraction-Aware Sound Localization for a Non-Line-of-Sight Source, by Inkyu An and 4 other authors Download PDF Abstract:We present a novel sound localization algorithm for a non-line-of-sight (NLOS) sound source in indoor environments. Shao-Ping, Nonlinear acoustic-optical effect and extraordinary diffraction distribution in liquid surface. ![]() Vibration and Sound (McGraw-Hill, New York, 1948), p. Morse, Acoustical Society of America, American Institute of Physics. Fort, Single-particle diffraction and interference at a macroscopic scale. Gautier et al., From bouncing to floating: noncoalescence of drops on a fluid bath. We also explore how constructive and destructive interference patterns are. We investigate qualitatively how diffraction affects sound waves of various frequencies. We head back to the recording studio to study interference and diffraction of sound waves. Su et al., Visualizing detecting low-frequency underwater acoustic signals by means of optical diffraction. Segment D: Sound: Diffraction and Interference. Wang et al., Angle compensation and asymmetry effect of light diffracted by millimeter liquid surface slosh wave. Wang, Small amplitude liquid surface sloshing process detected by optical method. Pingping et al., Low-gravity liquid nonlinear sloshing analysis in a tank under pitching excitation. Empirical acousto-optic sonar performance versus water surface condition, in MTS/IEEE Oceans 2001. Barrier insertion cancels ground effects. For 'Mixed Ground' use a value for G between 0 and 1 that represents the fraction of the ground that is soft. Examples include grass, trees and other vegetation. 31(1), 179–187 (2006)Īntonelli L, Kirsteins I. Soft ground is porous and absorbs sound waves. Antonelli, Experimental detection and reception performance for uplink underwater acoustic communication using a remote, in-air, acousto-optic sensor. Buhrow, Direct measurement of the attenuation of capillary waves by laser interferometry: noncontact determination of viscosity. ![]()
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