Accepted Papers

Robust beamformer design against mismatch in microphone characteristics and acoustic environment

Lara Nahma, Hai Huyen Dam and Sven Nordholm

Curtin University

Broadband beamformers are known to be sensitive not only to mismatches in microphone characteristics but also in the acoustic environment. In this work, we propose a robust broadband beamformer design using weighted least square optimization technique, which takes into account the room reverberation as well as the mismatches in microphone gain and phase characteristics. The robust design procedure optimize the mean performance of the beamformer with the room impulse response estimated using the image source method. Design examples demonstrateperformance improvement in terms ofsignificant reduction in error sensitivity for the robust design formulation.