利用约束LMS方法对正弦信号进行滤波，分别绘制了输入和输出信号，结果显示约束LMS方法对噪声有一定的抑制作用。(The constrained LMS method is used to filter the sinusoidal signal, and the input and output signals are plotted respectively. The results show that the constrained LMS method has a certain inhi