FDM array based dual channel speech enhancement method

With more and more miniature speech communication devices coming out, two-element microphone array draws a lot of attention due to its simplicity and the ability to suppress directional noise. This paper develops a dual channel speech enhancement method by combining the first- order differential microphone (FDM) array and the single-channel spectral enhancement techniques. The method can obtain an estimate of speech signal and noise signal simultaneously, and it corrects the noise spectrum in a real-time manner. Compared with the existing dual channel speech enhancement techniques, the proposed method can achieve 2~6 dB output signal-to-noise ratio (SNR) gain with only 1/3 computational complexity.