2 May
2015
2 May
'15
10:34 p.m.
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