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Microphone array response to speaker movements

Matched filtering and adaptive beamforming are both necessary for efficient speech dereverberation and noise reduction by microphone arrays. This can be achieved by the identification of impulse responses. We show that adaptive microphone arrays are sensitive to the identification errors of the impulse responses, particularly due to speaker movements. We prove that adjusted matched-filtering and permanent tracking of the impulse responses are also necessary. The proposed microphone array responds well to these requirements under realistic conditions.