Microphones' directivity for the localization of sound sources

Piervincenzo Rizzo; Mahdi Tajari; Antonino Spada

doi:10.1117/12.884626

23 May 2011 Microphones' directivity for the localization of sound sources

Piervincenzo Rizzo, Mahdi Tajari, Antonino Spada

Proceedings Volume 8046, Unattended Ground, Sea, and Air Sensor Technologies and Applications XIII; 804603 (2011) https://doi.org/10.1117/12.884626
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

In a recent paper [P. Rizzo, G. Bordoni, A. Marzani, and J. Vipperman, "Localization of Sound Sources by Means of Unidirectional Microphones, Meas. Sci. Tech., 20, 055202 (12pp), 2009] the proof-of-concept of an approach for the localization of acoustic sources was presented. The method relies on the use of unidirectional microphones and amplitude-based signals' features to extract information about the direction of the incoming sound. By intersecting the directions identified by a pair of microphones, the position of the emitting source can be identified. In this paper we expand the work presented previously by assessing the effectiveness of the approach for the localization of an acoustic source in an indoor setting. As the method relies on the accurate knowledge of the microphones directivity, analytical expression of the acoustic sensors polar pattern were derived by testing them in an anechoic chamber. Then an experiment was conducted in an empty laboratory by using an array of three unidirectional microphones. The ability to locate the position of a commercial speaker placed at different positions in the room is discussed. The objective of this study is to propose a valid alternative to the common application of spaced arrays and therefore to introduce a new generation of reduced size sound detectors and localizers. The ability of the proposed methodology to locate the position of a commercial speaker placed at different positions in the room was evaluated and compared to the accuracy provided by a conventional time delay estimate algorithm.

Citation Download Citation

Piervincenzo Rizzo, Mahdi Tajari, and Antonino Spada "Microphones' directivity for the localization of sound sources", Proc. SPIE 8046, Unattended Ground, Sea, and Air Sensor Technologies and Applications XIII, 804603 (23 May 2011); https://doi.org/10.1117/12.884626

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KEYWORDS

Acoustics

Sensors

Plasma display panels

Signal detection

Solid state lighting

Source localization

Calibration

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