in fft function in matlab, For length N input vector x, the DFT is a length N vector X, with elements N X(k) = sum x(n)*exp(-j*2*pi*(k-1)*(n-1)/N), 1
Dear Reseem,
The increment value of the fft say deltaF = 1/N .. where N is the number of samples in time domain. To play with this increment value, you could append zeros at the end of your signal..
Example if you have 64 samples (N =64) and you apply an fft to that signal, you would get in frequency domain increments for deltaF = 1/N = 1/64.
If you add say 36 zeros in the end of the 64 samples in time domain you would get N = 64 + 36 = 100 and applying fft to that you would get increments of deltaF = 1/100 .
Hope this helps
Dear Reseem Hameed
The equation for the DFT is X(k/NT)=sum(x(nT)exp(-j*2*pi*n*k/N), 0
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