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Self-Calibration-Based Robust Near-Field Adaptive Beamforming for Microphone Arrays

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3 Author(s)
Wee Ser ; Center for Signal Process., Nanyang Technol. Univ., Singapore ; Huawei Chen ; Zhu Liang Yu

Near-field beamforming using a microphone array has found many applications, such as sound acquisition in small rooms. However, robust near-field adaptive beamforming (NABF) against focal point errors has not been studied much in the literature until recently. In this brief, a robust near-field adaptive beamformer is proposed. The proposed method is developed by combining a new formulation of the point-constrained NABF and a self-calibration technique, in the presence of focal point uncertainties. The proposed method suffers from no loss in the degrees of freedom for interference rejection. Compared with conventional calibration-based adaptive beamformers, the proposed method has the advantage of not needing a noise-free calibration signal. Simulation results demonstrate that the performance of the proposed method is superior to that of the existing methods

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:54 ,  Issue: 3 )