Microphones’ Directivity for the Localization of Sound Sources

Antonino Spada, Piervincenzo Rizzo

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In a recent paper [P. Rizzo, G. Bordoni, A. Marzani, and J. Vipperman, “Localization of Sound Sources byMeans of Unidirectional Microphones, Meas. Sci. Tech., 20, 055202 (12pp), 2009] the proof-of-concept of anapproach for the localization of acoustic sources was presented. The method relies on the use of unidirectionalmicrophones 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 beidentified.In this paper we expand the work presented previously by assessing the effectiveness of the approach for thelocalization of an acoustic source in an indoor setting. As the method relies on the accurate knowledge of themicrophones directivity, analytical expression of the acoustic sensors polar pattern were derived by testing them inan anechoic chamber. Then an experiment was conducted in an empty laboratory by using an array of threeunidirectional microphones. The ability to locate the position of a commercial speaker placed at different positionsin the room is discussed.The objective of this study is to propose a valid alternative to the common application of spaced arrays andtherefore to introduce a new generation of reduced size sound detectors and localizers. The ability of the proposedmethodology to locate the position of a commercial speaker placed at different positions in the room was evaluatedand compared to the accuracy provided by a conventional time delay estimate algorithm.
Lingua originaleEnglish
Numero di pagine7
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • ???subjectarea.asjc.2500.2504???
  • ???subjectarea.asjc.3100.3104???
  • ???subjectarea.asjc.1700.1706???
  • ???subjectarea.asjc.2600.2604???
  • ???subjectarea.asjc.2200.2208???


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