Phase analyzer with fft~ or pfft~

aliatzori's icon
Max Patch
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Hello!
I want to build a phase analyzer patch with fft and cartopol but i think i'm missing something about phase response theory because all i see is a random response.

in this patch i modified the plot~ help file.
Can you point the errors in the patch?
I have to use a different source than noise~ to see plots like this?
http://www.analog.com/library/analogdialogue/archives/43-09/active_filters.html

Any help would be appreciated.
Thanks.