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Published in:
2010 | OriginalPaper | Chapter
Steerable Distributed Large-Aperture Audio Array Using Low-Power Wireless Acoustic Sensor Nodes
Authors : János Sallai, Ákos Lédeczi, Xenofon Koutsoukos, Péter Volgyesi
Published in: Networked Digital Technologies
Publisher: Springer Berlin Heidelberg
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Recent advancements in low-power wireless communication technologies allow for rapid deployable embedded monitoring applications with a deployment lifetime of several weeks of months. In this work, we present a work-in-progress wireless audio streaming solution that uses a network of small wireless microphone arrays to form a distributed steerable large-aperture array. To keep the application’s communication bandwidth requirements manageable, we use a hierarchical data fusion algorithm that allows for delay-and-sum style beamforming to be carried out in-network, streaming the audio data along a routing tree to a base station. With the proposed distributed beamforming approach, it is sufficient to communicate as few as
log
(
n
) data streams for a network of
n
sensors, which is a significant reduction from a centralized approach that would require all
n
streams to be routed to the base station.