Dear Federico,
Thank you for the proposal.
I am afraid that the "symmetric" and "periodic" flag names are not
intuitive to me.
Indeed, the generated window is /always/ both periodic and symmetric. It
is anyway "algorithmically seen" as periodic (from a spectral point of
view), since it is regularly sampled, while regular-sampling and
periodicity are FT-dual.
The point is that it is either *open*, or *closed* (what is rather
expected, for a window. Sorry for the (serious) joke :-), with a closing
point at the same level as the opening one.
I know from where these "symmetric" and "periodic" keyworks come from.
But, sorry, i can't resolve myself blindly copy others without
discussion. Badly naming things usually become counterproductive,
noticeably when teaching (here signal processing).
For contribution,
Best regards
Samuel
Le 11/02/2021 à 08:12, Federico Miyara a écrit :
Dear All,
I wonder why windowing functions such as Hann, Hamming, etc., provided
by window(), are only symmetric.
When used for spectral analysis by subsequent use of fft(), the
periodic weighting is better than the symmetric one. The symmetric
window is mainly used in the design of FIR filters, which I guess is a
less frequent application than spectral analysis.
While it is true that an easy workaround to get a periodic window of
length n is, for instance
w = window("hn", n+1)(1:$-1);
a syntax such as this
w = window("hn", n, "per");
would be easier.Setting "sym" as the default option, no backward
compatibility issues would possibly arise.
Regards,
Federico Miyara
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