[PD] [ggee/notch] / [ggee/bandpass] seem to work at default/fixed samplerate of 44100
Raphaël Ilias
phae.ilias at gmail.com
Sat May 2 22:34:16 CEST 2015
Hello,
I was testing the [bandpass] and [notch] object's from "ggee" library,
which compute coefficients values for vanilla's [biquad~] and discovered
that the center frequency wasn't the one expected, but was shifted
something like 10%.
After a few measurement I found that the real center frequency was around
1.08841 upwards the ferquency value set to [bandpass] or to [notch]
inlets...
...and I later realized that 48000/44100 = 1.088435... and that on my
computer, pd is working at 48000 Hz.
So, apparently these objects are calculating the coefficients with an
supposed samplerate of 44100 Hz.
(i'm using pd-extended 0.43-4)
cheers,
Raphaël
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