Influence of MEMS Microphones Imperfections on the Performance of First-Order Adaptive Differential Microphone Arrays
Sprache des Vortragstitels:
International Conference on Computer Aided Systems Theory (EUROCAST 2017)
Sprache des Tagungstitel:
Besides a number of other factors, the performance of an acoustic beamformer is dependent on the amplitude and phase mismatch between the microphones in a microphone array. Altough Micro-electro-mechanical Systems (MEMS) microphones offer a much better frequency response matching than conventional electric condenser microphones (ECM) there is still room for improvement of the matching between MEMS microphones. In this work the performance of a first-order adaptive differential microphone array (FOADMA) is analyzed, when used in a speech enhancement application. Specifically, we investigate the impact of the number of used microphones, the microphone spacing, the microphone signal-to-noise ratio (SNR) and the microphone mismatch. As an important outcome we will show that by the use of more than two microphones the speech enhancement performance becomes almost independent of the microphone mismatch.