基于临界频带的子带滤波语音增强

根据人耳的听觉感知特性,提出了一种基于子带滤波的优化语音增强方法。基于临界频带设计滤波器将输入信号分成若干子带,依据估计出的每个子带的短时信噪比来对相应子带的时域信号逐帧进行独立的自适应处理后再合成。语音增强性能评估结果表明,有效地去除背景噪声的同时还抑制了音乐噪声,减少了语音的听觉失真,提高了增强语音的可懂度。

Speech Enhancement Employing Subband Filter Based on Critical Band

According to the acoustic characteristics of human ears,an optimizing speech enhancement approach is proposed based on subband filters.Input signals are divided into several subbands using filters with critical band,and then in each subband,adaptive processing is made respectively in the time domain according to the short-term SNR.After that processed signals are integrated together to form the final output signal.Evaluation result shows that it greatly reduces background noise and at the same time is free from musical noise and speech distortion,thus the intelligibility of the speech signal can be enhanced.