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<div class="moz-cite-prefix">Dear Federico,<br>
<br>
Thank you for the proposal.<br>
I am afraid that the "symmetric" and "periodic" flag names are not
intuitive to me.<br>
Indeed, the generated window is <i>always</i> 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.<br>
<br>
The point is that it is either <b>open</b>, or <b>closed</b>
(what is rather expected, for a window. Sorry for the (serious)
joke :-), with a closing point at the same level as the opening
one.<br>
<br>
I know from where these "symmetric" and "periodic" keyworks come
from.<br>
But, sorry, i can't resolve myself blindly copy others without
discussion. Badly naming things usually become counterproductive,
noticeably when teaching (here signal processing).<br>
<br>
For contribution,<br>
<br>
Best regards<br>
Samuel<br>
<br>
<br>
</div>
<div class="moz-cite-prefix">Le 11/02/2021 à 08:12, Federico Miyara
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:c79312b9-0333-cc0e-f7ec-e6cbe0bcf844@fceia.unr.edu.ar">
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<font face="Courier New">Dear All,<br>
<br>
I wonder why windowing functions such as Hann, Hamming, etc.,
provided by window(), are only symmetric.<br>
<br>
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.<br>
<br>
While it is true that an easy workaround to get a periodic
window of length n is, for instance<br>
<br>
w = </font><font face="Courier New">window("hn", n+1)(1:$-1); <br>
<br>
</font><font face="Courier New">a syntax such as this <br>
<br>
w = </font><font face="Courier New">window("hn", n, "per"); <br>
<br>
</font><font face="Courier New">would be easier.</font><font
face="Courier New"> Setting "sym" as the default option, no
backward compatibility issues would possibly arise.<br>
<br>
Regards,<br>
<br>
Federico Miyara<br>
</font>
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