Speech enhancement for adaptive microphone arrays via a blocking matrix using leaky adaptive filters

This paper presents a new broadband adaptive beamformer structure specifically applicable to microphone arrays. The proposed beamformer structure contains a blocking matrix (BM) that uses leaky adaptive filters (LAF) to limit the attenuation of the noise signal at the output of the BM while maintaining high target signal cancellation in the look direction. Simulation results show that the interference suppression of this proposed beamformer can be as much as 10 dB better than the beamformer in Goh et al. (2003), and it still superior by 5 dB when the signal-to-noise ratio (SNR) is as low as -5 dB.