... taking the DFT The window makes the peaks look the same and reduces the tails, but broadens the peaks Chapter 9- Applications of the DFT 175 This is also good Third, the window reduces the resolution ... know the value of two parameters: M and fc These are found from the relations: M ' N & , and fc ' s/N , where N is the length of the DFT being used, and s is the number of samples you want on the ... resolution The longer the DFT, the better the ability to separate closely spaced features In these example magnitudes, a 128 point DFT cannot resolve the two peaks, while a 512 point DFT can 174 The...