Why do we need DFT when we already have DTFT? We already have DTFT so why do we need DFT?
Please don't write DTFT is used for discrete, aperiodic signal which transfers in the frequency domain to periodic and continuous, but in DFT is discrete periodic transfer in discrete periodic, these things I already know.
The answer is the same to the question: &quot;Why do we need computers to process data when we have paper and pencil?&quot;
DTFT as well as the continuous-time Fourier Transform is a theoretical tool for infinitely long hypothetical signals.
the DFT is to observe the spectrum of actual data that is finite in size.