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
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.