一种近场环境下的麦克风阵列语音增强方法

针对语音源位于阵列近场而干扰噪声源位于阵列远场的声学环境,本文提出了一种基于近场双自适应波束形成的麦克风阵列语音增强方法。该方法利用近场声波波前的特点,主通道采用最小方差无失真响应准则的近场优化波束形成器,辅助通道采用双自适应波束形成技术,从而有效地抑制了混响和噪声对语音信号的影响。仿真实验结果表明,在房间混响条件下,本文方法具有良好的噪声抑制性能。

Speech Enhancement based on Microphone Array for the Near-field Environments

Considering the acoustical environment where a desired speech source locates in the near field of the array and other interference sources locate in the far field of the array,a new near-field double adaptive beamforming method for microphone array speech enhancement is introduced in the paper.It takes full advantage of spherical nature of the sound wavefront in the minimum vari- ance distortionaless response(MVDR)beamformer.By using the optimal near-field beamformer based on MVDR the in the main chan- nel and double adaptive beamforming in the auxiliary channel,the proposed method attenuates the effects of reverberation and noise on the speech.Simulation results demonstrate that compared with other methods,the proposed microphone array speech enhancement meth- od exhibits the better noise reduction performance in a small room.