Beam Forming of Small-Size Microphone Arrays for Audio Applications

Multi-microphone array processing techniques and applications go together with the use of small-size arrays. As far as beamforming in array signal processing performs a type of spatial filtering, dimension of array is related to the frequency of the coming wave. Therefore, small-size arrays are not appropriate for audio signals. In this paper, we introduce a novel technique to use small-size arrays for audio signals. Besides, the problem of low efficiency beamforming due to dealing with wideband signals will be resolved. Constant directivity is another gift of using this technique.

Keywords:

Beamforming , microphone array , delay-and-sum beamformer