一种改进的手机双麦克风消噪系统

An improved dual microphone noise suppression system for handset

针对现有手机双麦克风消噪系统无法应对多种复杂噪声环境、在消除噪声的同时会引起语音失真等问题,本文提出一种新的手机双麦克风消噪系统。该系统将时域与频域处理结合,在噪声估计和消除两方面均有改进,结合单、双麦克风的噪声估计算法,提高了噪声估计的准确性。此外,将基音检测与消噪处理结合,在语音帧中估计语音基音频率,确定语音和噪声频率点,根据语音和噪声频率点分别调整维纳滤波器参数,在滤除噪声的同时尽可能地保留语音频率点,从而减少语音失真。实验结果表明,与现有双麦克风消噪系统相比,本系统在抑制噪声的同时能够有效减少消噪算法对语音造成的损害,提高了手机通话质量,对于方向性的语音干扰也起到很好的抑制效果。

Existing dual microphone speech enhancement systems cause speech degradation under some complicated noise environments in handset applications.In order to solve this problem,this paper proposes an improved dual microphone speech enhancement system by combining both time and frequency processing.Mainly the system integrates both dual microphone and single microphone processing to improve both noise estimate and noise suppression.In addition,the system introduces a pitch frequency estimate and further accurately detects both bin-wise speech and noise and then controls the parameters of Winner filter to get less speech degradation while more noise suppression.Experiments demonstrate the improved system can get better performance in terms of both noise suppression and speech degradation for not only diffuse noise but also directional spot interference.