Friday 22 November 2013

Distributed Multiple Constraints Generalized Side lobe Canceler for Fully Connected Wireless Acoustic Sensor Networks

Abstract:

This paper proposes a distributed multiple constraints generalized side lobe canceler (GSC) for speech enhancement in and node fully connected wireless acoustic sensor network (WASN) comprising microphones. Our algorithm is designed to operate in reverberant environments with constrained speakers (including both desired and competing speakers). Rather than broadcasting microphone signals, a significant communication bandwidth reduction is obtained by performing local beam forming at the nodes, and utilizing only transmission channels. Each node processes its own microphone signals together with the transmitted signals.The GSC-form implementation, by separating the constraints and the minimization, enables the adaptation of the BF during speech-absent time segments, and relaxes the requirement of other distributed LCMV based algorithms to re-estimate the sources RTFs after each iteration.

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