中文说明：
用matlab仿真，研究不同阈值降噪后的效果，使用penalty阙值降噪后信号，使用Birge_Massart阙值降噪后信号，使用缺省阙值降噪后信号。
English Description：
Matlab simulation is used to study the effect of different threshold denoising. After denoising, the signal is denoised by using the threshold of penalty, and the signal is denoised by using Birge_ Masart threshold denoised signal, using the default threshold denoised signal.