MATLAB: What is interpolated dft

interpolated dft

Is matlab have any inbulit function for interpolated dft?

Best Answer

Yes, you just zero pad the input by providing the optional NFFT argument to fft()

If you use an NFFT value that is greater than the length of the input data, the DFT is interpolated. Instead of getting DFT coefficients at Fs/N where Fs is the sampling frequency, you get them at Fs/NFFT

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MATLAB: DFT

Hi Lisa, you had a couple problems with your code:

N= 4; 
x=1:4;
for k=0:3
    for n = 0:3;
y(n+1) = x(n+1).*exp(-(1j*2*pi*k*n)/N);
    end
    xdft(k+1)= sum(y);
end

compare to

fft(x)

Best Answer

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