对含噪正弦波分别强制消噪、默认消噪、给定软阈值消噪等等方法进行消噪，选取不同的小波函数、不同的阈值函数将会产生不同的效果。其中常用的阈值函数包括两种：硬阈值法和软阈值法。-With the method of noise elimination, the default de-noising and the given soft threshold denoising method, the different wavelet function and the threshold function are selected to produce different effects. Among them, two kinds of threshold functions are hard and soft threshold.