ex3029.m

the file contain many matlab signal source code and many example .

subplot(211)
N=64;n=0:N-1;t=0.01*n;
q=n*2*pi/N;
x=2*sin(4*pi*t)+5*cos(8*pi*t);
y=fft(x,N);
plot(q,abs(y))
%
subplot(212)
N=64;n=0:N-1;t=0.01*n;
q=n*2*pi/N;
x=2*sin(4*pi*t)+5*cos(8*pi*t)+0.8*randn(1,N);
y=fft(x,N);
plot(q,abs(y))