Лабы / L 1 / L1_3

t=0:0.001:0.1;

y1=sin(2*pi*60*t)

+sin(2*pi*120*t);

A=randn(size(t));

y=y1+A;

plot(t,y1);

pause;

plot(t,y);

pause;

Y=fft(y,256);

Pyy=Y.*conj(Y);

f=1000/256*(0:127);

plot(f,Pyy(1:128))