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Journal of Sensors
Volume 2017, Article ID 6782176, 20 pages
Research Article

Design Considerations When Accelerating an FPGA-Based Digital Microphone Array for Sound-Source Localization

INDI Department, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium

Correspondence should be addressed to Bruno da Silva;

Received 16 March 2017; Accepted 16 May 2017; Published 20 June 2017

Academic Editor: Paolo Bruschi

Copyright © 2017 Bruno da Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The use of microphone arrays for sound-source localization is a well-researched topic. The response of such sensor arrays is dependent on the quantity of microphones operating on the array. A higher number of microphones, however, increase the computational demand, making real-time response challenging. In this paper, we present a Filter-and-Sum based architecture and several acceleration techniques to provide accurate sound-source localization in real-time. Experiments demonstrate how an accurate sound-source localization is obtained in a couple of milliseconds, independently of the number of microphones. Finally, we also propose different strategies to further accelerate the sound-source localization while offering increased angular resolution.