Distributed Multiple Constraints Generalized Sidelobe Canceler for Fully Connected Wireless Acoustic Sensor Networks
Shmulik Markovich‐Golan, Sharon Gannot, Israel Cohen · IEEE Transactions on Audio Speech and Language Processing · 2012
This paper proposes a distributed multiple constraints generalized sidelobe canceler (GSC) for speech enhancement in anN-node fully connected wireless acoustic sensor network (WASN) comprisingMmicrophones. Our algorithm is designed to operate in reverberant environments with constrained speakers (including both desired and competing speakers). Rather than broadcastingMmicrophone signals, a significant communication bandwidth reduction is obtained by performing local beamforming at the nodes, and utilizing only transmission channels. Each node processes its own microphone signals together with the N + P 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. We provide a full convergence proof of the proposed structure to the centralized GSC-beamformer (BF). An extensive experimental study of both narrowband and (wideband) speech signals verifíes the theoretical analysis.