Monday 20 April 2015

frequency spectrum - How to calculate resolution of DFT with Hamming/Hann window?


The frequency resolution of a DFT with a rectangular window of size $N$ is given by $f_s/N$. 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 $1.5 \cdot f_s/N$?





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