A new subband structure for an acoustic beamformer with leaky adaptive filters in the blocking matrices

In this paper, a new subband adaptive beamformer is proposed that is specifically applicable to microphone arrays that can allow up to ±30° target direction of arrival (DOA) range. The proposed subband beamformer contains a blocking matrix (BM) that uses leaky subband adaptive filters to resolve the problem of the signal blocking capability in the BM when the input signals to the microphone array are highly colored. Simulation results show that this proposed subband beamformer is able to give a better interference suppression than the equivalent fullband beamformer.