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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: FFT of chirp signal
Replies: 3   Last Post: Nov 22, 2012 2:12 AM

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naser

Posts: 60
Registered: 3/20/09
FFT of chirp signal
Posted: Jan 31, 2010 10:28 AM
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I generate a chirp signal with matlab. I want to plot FFT of this signal but results is wrong.I think FFt this signal must be a line in a interval frequency.

Would you please help me.

t=[0:1e-6:400/1000];
y=chirp(t,100,.4,100000);
Y = fft(y,1024);
Pyy = Y.* conj(Y) / 1024;
f = 1000000*(0:512)/1024;
plot(f,Pyy(1:513))
title('Frequency content of y')
xlabel('frequency (Hz)')

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