中文摘要：

针对硬阈值函数不连续性、软阈值函数中存在恒定偏差的问题，基于2种改进的阈值函数，构造了一种新阈值函数，提出了一种基于小波变换的新阈值函数语音去噪方法。分别用硬阈值处理方法、软阈值处理方法及新阈值处理方法对系统信号和纯净语音信号进行去噪仿真实验。实验结果表明，新阈值去噪方法能减小信号失真，使重构信号逼近原始信号，达到了良好的去噪效果，比传统方法更具优越性和有效性。

英文摘要：

In view of the discontinuity of hard threshold function and the constant bias in soft threshold function,a new threshold function based on two improved threshold functions is constructed,and a new function speech denoising method based on wavelet transform is proposed.Hard threshold processing method,soft threshold processing method and the new threshold processing method are used for the system signal and pure speech signal denoising simulation experiment.The ex-perimental results show that the new threshold denoising method can reduce signal distortion,make the reconstructed signal approximation to the original signal,and achieve good denoising effect.It is better than the traditional method in superiority and effectiveness.