why is periodogram(y,w) not periodogram(y.*w)
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why is periodogram(y,w) not the same as periodogram(y.*w), where y is the signal and w the window. For a rectangular window it is the same but for a hanning window there is a difference that has something to do with the mean and variance of the window I guess. What exactly is this difference? And why is this difference there? Same holds for pwelch.
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Wayne King
il 6 Feb 2014
Modificato: Wayne King
il 6 Feb 2014
The difference is that the syntax periodogram(y,w) uses the window normalization constant explained here:
Read about the modified periodogram.
While periodogram(y.*w) does not use that normalization because you are using a rectangular window
I would recommend using
periodogram(y,w)
However, if you look at the two periodograms, you'll see that one is simply a scaled version of the other and that scaling is due to window normalization you get with
periodogram(y,w)
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