3aEA1. A DSP implementation of source location using microphone arrays.

Session: Wednesday Morning, May 15

Time: 8:05

Author: Daniel V. Rabinkin
Author: Richard J. Ranomeron
Author: Art Dahl
Author: Joe French
Author: James L. Flanagan
Location: Ctr. for Comput. Aids for Industrial Productivity, Rutgers Univ., P.O. Box 1390, Piscataway, NJ 08855-1390
Author: Michael H. Bianchi
Location: Bell Commun. Res., Morristown, NJ 07960-6438


The design, implementation, and performance of a low-cost, real-time DSP system for source location is discussed. The system consists of an eight-element electret microphone array connected to a Signalogic DSP daughterboard hosted by a PC. The system determines the location of a speaker in the audience in an irregularly shaped auditorium. The auditorium presents a nonideal acoustical environment; some of the walls are acoustically treated but there still exist significant reverberation and a large amount of low-frequency noise from fans in the ceiling. The source location algorithm is implemented in a two-step process: The first step determines time delay of arrival (TDOA) for select microphone pairs. A modified version of the cross-power spectrum phase method [M. Omologo and P. Svaizer, Proceedings of IEEE ICASSP 1994 (IEEE, New York, 1994), pp. II273--II276] is used to compute TDOAs and is implemented on the DSP daughterboard. The second step uses the computed TDOAs in a least-mean-square gradient descent search algorithm implemented on the PC to compute a location estimate. [Work supported by a contract with Bell Communications Research.]

from ASA 131st Meeting, Indianapolis, May 1996