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Discussion Groups | Matlab DSP | About Frequency and FFT ?

Technical discussion about Matlab and issues related to Digital Signal Processing.

  

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About Frequency and FFT ? - aloha - Feb 20 13:06:00 2001



Hi!

I can get the correct frequency value from below code:

Fs = 100;
n = 1/Fs:1/Fs:2;
x = 0.8*sin(2*pi*10*n);
z = fft(x);
N = length(z);
z = abs(z(1:N/2+1));
freq = [0:N/2]/N*Fs;
stem(freq,z);grid;zoom on;

but, when I use fft(x,N) -- N=2^k, who can I get the correct frequency value? Thanks!



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