说明：  小波去噪，将信号映射到小波域，根据噪声和噪声的小波系数在不同尺度上具有不同的性质和机理，对含噪信号的小波系数进行处理。
(Wavelet denoising, the signal is mapped to the wavelet domain, according to the noise and noise wavelet coefficients in different scales have different properties and mechanisms, the noise signal of the wavelet coefficients for processing.)