Sorry for the fat-fingers in the original post; wrote quickly on my tiny phone keyboard...
On Mon, Nov 18, 2024, 11:24 Aaron Krister Johnson <akjmi...@gmail.com> wrote: > Hi all, > > Perhaps Julius O. Smith or some expert in filter resonance knows the > answer: > > I have an app I built using the Karplus-Strong example in one of the > "getting started" tutorial. It uses fi.fb_fcomb at its heart -- a comb > filter excited by a burst of noise, then allowed to resonate and decay like > a string. > > It is an _awesome_ sounding "superclav" as I call it; I have been playing > Bach on it, it is expressive and its character is super-perfect for Baroque > music. > > My issue is: I have set up a well-twmpered 12-note gamut using a waveform > table, it works really well. But for some reason, at SR=48000, every > C-sharp in my gamut, regardless of octave played, has an extra bit of > bright "ping" that makes it stand out from the others. I suspect that > particular pitch somehow reinforces, in the combo filter, some resonance > mode and its harmonics. > > Does anyone have any ideas on how to mitigate and work around this? I have > tried post-EQing the signal, but it's tough to do it for each harmonic, and > it ends up doing the reverse: making each C-sharp, if the band-reject EQ > resonance is narrow enough, sound too "pinched". > > Perhaps I need to shift my overall gamut by some constant so that no pitch > hits the resonance peak? That's not ideal, though, so I am wondering if > perhaps it's possible to mitigate this by pre-filyering the noise burst or > similar, in such a way that the peak gets reduced on the excitation-end of > things. > > Any/all ideas here are appreciated, and thanks again to the wonderful devs > for giving us this powerful tool. > > -Aaron > >
_______________________________________________ Faudiostream-users mailing list Faudiostream-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/faudiostream-users
