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Sensors 2012, 12(8), 10584-10603; doi:10.3390/s120810584

Binaural Sound Localizer for Azimuthal Movement Detection Based on Diffraction

1
Division of Electronics & Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, Korea
2
Department of Electrical & Computer Engineering, Mercer University, 1400 Coleman Avenue, Macon, GA 31207, USA
*
Author to whom correspondence should be addressed.
Received: 30 May 2012 / Revised: 10 July 2012 / Accepted: 25 July 2012 / Published: 3 August 2012
(This article belongs to the Section Physical Sensors)
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Abstract

Sound localization can be realized by utilizing the physics of acoustics in various methods. This paper investigates a novel detection architecture for the azimuthal movement of sound source based on the interaural level difference (ILD) between two receivers. One of the microphones in the system is surrounded by barriers of various heights in order to cast the direction dependent diffraction of the incoming signal. The gradient analysis of the ILD between the structured and unstructured microphone demonstrates the rotation directions as clockwise, counter clockwise, and no rotation of the sound source. Acoustic experiments with different types of sound source over a wide range of target movements show that the average true positive and false positive rates are 67% and 16%, respectively. Spectral analysis demonstrates that the low frequency delivers decreased true and false positive rates and the high frequency presents increases of both rates, overall.
Keywords: sound localization; rotation detection; diffraction; interaural level difference (ILD) sound localization; rotation detection; diffraction; interaural level difference (ILD)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kim, K.; Choi, A. Binaural Sound Localizer for Azimuthal Movement Detection Based on Diffraction. Sensors 2012, 12, 10584-10603.

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