ex2p1.m

关于数字信号处理的一些matlab例程

n=[-5:5];
x=2*impseq(-2,-5,5)-impseq(4,-5,5);
subplot(2,2,1);stem(n,x);title('seqence in problem 2.1a')
xlabel('n');ylabel('x(n)');

n=[0:20];
x1=n.*(stepseq(0,0,20)-stepseq(10,0,20));
x2=10*exp(-0.3*(n-10)).*(stepseq(10,0,20)-stepseq(20,0,20));
x=x1+x2;
subplot(2,2,2);stem(n,x);title('sequency in problem 2.1b')
xlabel('n');ylabel('x(n)');

n=[0:50];
x=cos(0.04*pi*n)+0.2*randn(size(n));
subplot(2,2,3);stem(n,x);title('sequency in problem 2.1c')
xlabel('n');ylabel('x(n)');

n=[-10:9];
x=[5,4,3,2,1];
xtitle=x'*ones(1,4)
xtitle=(xtitle(:))'
subplot(2,2,4);stem(n,xtitle);title('sequency in problem 2.1d')
xlabel('n');ylabel('xtitle(n)');