%1)已知位置向量同为n=0:6的以下三个序列:%x=[2,-1,4,7,0,-3,5];y=[-2,8,0,-3,6,2,-4];w=[7,0,-9,-3,4,2,-1];%请用MATLAB计算(a)u=x+y(b)v=x.*w(c)z=x-y.*wx=[2,-1,4,7,0,-3,5];y=[-2,8,0,-3,6,2,-4];w=[7,0,-9,-3,4,2,-1];u=x+yv=x.*wz=x-y.*w>>u=07446-11v=140-36-210-6-5z=16-14-2-24-71>>%(2)用MATLAB计算下列序列的线性卷积并作图:(可用conv函数求卷积,用stem%函数作图)%^a)x(n)=δ(n),h(n)=R5(n)%(b)x(n)=R3(n),h(n)=R4(n)%(c)x(n)=δ(n-2),h(n)=(n)x1=[1];h1=[11111];y1=conv(x1,h1)figure(1)stem(y1)x2=[111];h2=[1111];y2=conv(x2,h2)figure(2)stem(y2)x3=[001];h3=[];y3=conv(x3,h3)figure(3)stem(y3)结果:>>y1=11111y2=123321y3=>>%(3)设滤波器差分方程为y(n)=x(n)+x(n-1)+1/3y(n-1)+1/4y(n-2),%请用MATLAB计算并作图。%(a)系统的频率响应(数值与图形0~π共512点)。(可用freqz函数)%(b)设抽样频率为10kHz,输入正弦波幅度为5,频率为1kHz,记录长度5ms,求%系统输出。(可用filter函数)B=[1,1];A=[1,-1/3,-1/4];[H,w]=freqz(B,A,512);Hf=abs(H);Hx=angle(H);clffigure(1)plot(w,Hf)title('离散系统幅频特性曲线')figure(2)plot(w,Hx)title('离散系统相频特性曲线')n1=0::;t=n1;x=5*sin(2*pi*1000*n1);y=filter
数字信号处理数字信号实验1 来自淘豆网m.daumloan.com转载请标明出处.
