自適應噪聲對消器.doc

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1、自適應噪聲對消器clearallclc??????????????t=0:1/1000:10-1/1000;s=sin(2*pi*t);snr=10;s_power=var(s);??????????????%var函數(shù):返回方差值linear_snr=10^(snr/10);factor=sqrt(s_power/linear_snr);noise=randn(1,length(s))*factor;x=s+noise;???????????????????%由SNR計算隨機噪聲x1=noise;????????????????????%噪聲

2、源輸入x2=noise;w1=0;???????????????????????%權系數(shù)初值w2=0;e=zeros(1,length(x));y=0;u=0.05;?????????????????fori=1:10000?????????????????%LMS算法????y=w1*x1(i)+w2*x2(i);????e(i)=x(i)-y;????w1=w1+u*e(i)*x1(i);????w2=w2+u*e(i)*x2(i);???endfigure(1)subplot(3,1,1)plot(t,x);title('帶噪聲正弦信號'

3、)axis([010-1.21.2]);subplot(3,1,2)plot(t,noise);title('噪聲信號')axis([010-1.21.2]);subplot(3,1,3)plot(t,e);title('自適應噪聲對消器')axis([010-1.21.2]);