Steerable Distributed Large-Aperture Audio Array Using Low-Power Wireless Acoustic Sensor Nodes
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.
KeywordsWireless communication acoustic beamforming in-network aggregation
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