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Sensors 2015, 15(11), 28742-28763; doi:10.3390/s151128742

Near-Field Sound Localization Based on the Small Profile Monaural Structure

Division of Electronics & Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, Korea
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Academic Editor: Vittorio M. N. Passaro
Received: 14 September 2015 / Revised: 2 November 2015 / Accepted: 9 November 2015 / Published: 13 November 2015
(This article belongs to the Section Physical Sensors)
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Abstract

The acoustic wave around a sound source in the near-field area presents unconventional properties in the temporal, spectral, and spatial domains due to the propagation mechanism. This paper investigates a near-field sound localizer in a small profile structure with a single microphone. The asymmetric structure around the microphone provides a distinctive spectral variation that can be recognized by the dedicated algorithm for directional localization. The physical structure consists of ten pipes of different lengths in a vertical fashion and rectangular wings positioned between the pipes in radial directions. The sound from an individual direction travels through the nearest open pipe, which generates the particular fundamental frequency according to the acoustic resonance. The Cepstral parameter is modified to evaluate the fundamental frequency. Once the system estimates the fundamental frequency of the received signal, the length of arrival and angle of arrival (AoA) are derived by the designed model. From an azimuthal distance of 3–15 cm from the outer body of the pipes, the extensive acoustic experiments with a 3D-printed structure show that the direct and side directions deliver average hit rates of 89% and 73%, respectively. The closer positions to the system demonstrate higher accuracy, and the overall hit rate performance is 78% up to 15 cm away from the structure body. View Full-Text
Keywords: sound localization; angle of arrival; monaural localization; acoustic resonance; cylindrical pipe; fundamental frequency; Cepstrum; single microphone; near-field sound localization; angle of arrival; monaural localization; acoustic resonance; cylindrical pipe; fundamental frequency; Cepstrum; single microphone; near-field
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kim, Y.; Kim, K. Near-Field Sound Localization Based on the Small Profile Monaural Structure. Sensors 2015, 15, 28742-28763.

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