一种改进的子波域语音增强方法

本文基于文献［3］中提出的子波域去噪技术，并针对语音信号的特点提出了一种改进的子波域语音增强方法。该方法采用软限幅函数对语音信号的子波变换系数作阈值处理以达到去噪的目的。同时，为了防止在抑制噪声的过程中对语音的清音段信息造成损失，首先对语音信号进行了清浊音判别，然后针对不同的判别结果对清音段语音和浊音段语音采用不同的阈值处理方法。仿真实验表明，该方法效果良好且简便易行，是一种有效的语音增强技术。

A Modified Wavelet Domain Speech Enhancement Method

This paper proposed a modified speech enhancement method in the wavelet domain based on the one proposed in [3]. That is,using a soft thresholding to remove noise components from the wavelet coefficients of noisy speech. To prevent the quality degradation of the unvoiced sounds during the denoising process,we first separate unvoiced regions from noisy speech and then apply the thresholding method to them in a different way from other regions. Simulation results demonstrate the improved performance of our method.