| Re: bug in IDL's hanning() window-generating function [message #26179 is a reply to message #26002] |
Fri, 10 August 2001 09:16   |
Jaco van Gorkom
Messages: 97
Registered: November 2000
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Member |
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bennetsc@NOSPAMucs.orst.edu wrote:
> Jaco van Gorkom <j.c.van.gorkom@fz-juelich.de> wrote:
>> function Harris, n, _EXTRA=extra
>> return, (hanning(n+1, _EXTRA=extra))[0:n-1]
>> end
>>
> That looks like it should work for Hann, Hamming, and other
> raised cosine windows. I am not prepared to vouch for that method
> for all windows.
Well, I inherited *some* of the functionality from the built-in
HANNING() function. Therefore this is not very likely to produce other
types of windows, symmetric or not.
> So a Hann window, and other windows I've seen so far, should not
> include a repetition of its first coefficient as the last coefficient.
Thanks to all for the explanations and examples. I am now definitely a
convert to 5.5-style hanning windows. Even though I will certainly never
encounter an 80 dB signal-to-noise ratio...
Jaco
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