The frequency resolution of a DFT with a rectangular window of size N is given by fs/N. However, when using other window functions like a Hamming or Hanning window the resolution gets worse. How can I calculate the frequency resolution of a DFT when using a Hamming/Hanning window of size N?
I found some numbers regarding "effective noise bandwidth (ENBW)" but am not sure what exactly it means. The numbers were 1 for a rectangular window, 1.5 for Hanning and 1.37 for Hamming window. Does that mean the frequency resolution using a Hanning window is 1.5⋅fs/N?
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