A Design Of Speech Enhancement Based On Microphone Array

The main aim of speech enhancement is to pick up speechinformation from the speech signals with noise, in order to obtain highquality speech. But due to the existence of the noise diversity andenvironment reverberation, the speech quality received by microphone isnot so good, which affects the speech intelligibility and the speechprocessing performance. So the effective noise suppression is necessaryto improve the speech signials quality.The work in this paper focuses on two key techniques based onmicrophone array: time delay estimation and beamforming. In the aspectof time delay estimation, the performance of phase transform weightedgeneralized cross correlation method is analyzed. Generalized crosscorrelation algorithm by dual microphones extended up to the multimicrophones is analysed. The performance analysis is given under0dB~10dB SNR. In the aspect of beamforming, an optimization method basedon Kalman-filtering and MVDR adaptive beamforming is analysed.Simulation shows the validity of this method. Finally, this paper presentsa viable microphone array speech enhancement system design. Theimplementation of the software and hardware of the system is dealt with in detail. Microphone array hardware circuit has low power consumptionand expansibility, which can provide multichannel speech signals.