Sunday, 8 March 2015

fft - PSD scaling due to the windowing


I am struggling with the following problem for a while: If I have signal of duration N and I apply window (assume rectangular window) of size M < N how will this influence PSD of that signal after doing fft?


PSD of signal should be scaled (I assume) but by which amount and what is the mathematical explanation behind it?


Thank you for your answers in advance.




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