ex2p2.m

关于数字信号处理的一些matlab例程

n=-2:10;
x=[1:7,6:-1:1];
[x11,n11]=sigshift(x,n,5)
[x12,n12]=sigshift(x,n,-4)
[x1,n1]=sigadd(2*x11,n11,-3*x12,n12);
   subplot(2,1,1);
   stem(n1,x1);
   title('sequency in example 2.2a');
   xlabel('n');
   ylabel('x1(n)');

[x21,n21]=sigfold(x,n);
[x21,n21]=sigshift(x21,n21,3);
[x22,n22]=sigshift(x,n,2);
[x22,n22]=sigmult(x,n,x22,n22);
% [x2,n2]=sigadd(x21,n21,x22,n22);
subplot(2,1,2);stem(n2,x2);
   title('sequency in example 2.2b');
   xlabel('n');
   ylabel('x2(n)');