中文说明：
小波阈值去噪，小波变换是一种信号的时间——尺度（时间——频率）分析方法，它具有多分辨分析的特点，而且在时频两域都具有表征信号局部特征的能力。
English Description：
Wavelet threshold de-noising, wavelet transform is a time-scale (time-frequency) analysis method of signal, it has the characteristics of multi-resolution analysis, and has the ability to characterize the local characteristics of the signal in both time-frequency domain.