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From: | Jerry |
Subject: | Re: discuss [bug #43305] Hamming etc. windows are wrong |
Date: | Fri, 2 Jan 2015 17:38:10 -0700 |
On Dec 30, 2014, at 10:48 AM, Doug Stewart <address@hidden> wrote: I just moments ago wrote a response to Doug Stewart's note in a related thread, "Ltfat tria window", in which he gets a window (triangle in his case) which is rotated from what might be expected. That is, the triangle window is high at the ends and low in the middle. Of course this is convenient if one wants to apply it to a normally-indexed DFT result (0 .. N - 1) whereby the high frequencies are attenuated more than the low frequencies. As I note there, both types of windows are applicable, typically unrotated windows for applying to time series and rotated windows for applying to (unrotated) frequency series. So while we are attending to fixing up Octave's window functions I think we should add another option to return a rotated version. I suppose it's obvious but by rotated I mean circularly shifted by N / 2 or N / 2 - 1 depending on the direction of the shift. Jerry P.S. Here's a clarification on my name(s). Sorry for any confusion. |
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