A new cross spectral method to locate sound sources in one dimensional space

概要

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In this paper we describe a new method of locating sound sources in one dimensional space such as in a tube. Several methods have been proposed up to now to locate sound sources using cross spectral or correlation techniques. It is impossible, however, to locate sound sources by such conventional methods in cases where there is more than one sound source or when there are reflecting points in the tube. Therefore, we propose here a new method of locating sound sources using several sensors. In this method, the position of a sound source is first assumed, and the transfer fuctions from the assumed sound source to all the sensors are calculated using the sound velocity and the distances between them. After compensating the transfer characteristics, the cross spectra between all the pairs of sensor outputs are averaged. The assumed source point is scanned all over the tube. If the assumed source point coincides with the actual source point, the magnitude of the averaged cross spectrum takes a large value. However, the magnitude is less if the assumed point does not coincide with the actual point. The usefulness of this method is confirmed by both the computer simulation and the experiments using an electric shaker and a stream of water leaking from a hole in pipe.
社団法人日本音響学会の論文