A non-uniformly-spaced multiple microphone array speech enhancement method with small aperture size is proposed and analyzed. The technique utilizes a minimum redundant array structure used in antenna array in order to prevent spatial aliasing for high frequencies and uses phase difference-based dual microphone speech enhancement techniques to implement small-microphone array. It has highly directive features from the low-frequency to high frequencies evenly, and its performance is measured with directivity index. The directivity index (DI) for the proposed approach is about 3 dB higher than that of a multiple microphone approach with the phase-based filter.
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