dcthanshu.m

一个ＤＣＴ函数的程序

t=0:0.001:1;
x=t+sin(2*pi*10*t).*cos(2*pi*t);
y=dct(x);
n=fix(length(y)/20);
y(n+1:length(y))=0;
z=idct(y);
subplot(2,1,1)
plot(t,x)
subplot(2,1,2)
plot(t,z)