Adaptive Speech Enhancement for Microphone Array
Xu Ji · 2015
In a complex speech environment, microphone array speech enhancement techniques can effectively extract target speech signals and eliminate noise. In a conventional microphone array, the beam forming weighting coefficients are fixed. To flexibly control the beam forming direction of the microphone array and eliminate residual noise due to side-lobes, this paper presents an adaptive enhancement technique for microphone array speech. A microphone array with an adaptive filter is used to form a controllable generalized sidelobe canceller(GSC), followed by improved spectral subtraction with a Chebyshev window function. Simulation results show that the proposed method can effectively remove noise, improving the performance by about 3.5 d B with respect to the ordinary GSC.