In time-honoured fashion, I worked out an answer to this one shortly after posting to the list. I found a way to get a q value for resonbp from a decay time. My expression, which I got by inverting an expression I found for decay time in terms of q, is as follows:
q(decaytime) = freq / (1 - exp(log(0.001) / (decaytime * ma.SR))) * ma.PI / ma.SR; Comments and other solutions (particularly mind-expanding ones) still welcome. On 10/31/20, James Mckernon <jmcker...@gmail.com> wrote: > Hi all, > > My filter theory isn't very good; perhaps a filter-savvy faust user > can help me out. > > I'm seeking a filter in faust analogous to Ringz in supercollider ( > https://doc.sccode.org/Classes/Ringz.html ); that is, a filter whose > impulse response is a sinusoidal oscillation at a given frequency, > decaying over a given length of time. > > I suspect that fi.resonbp can do such a thing, but I couldn't work out > a scaling that would let me provide a decay time in seconds and > convert this to a Q for resonbp. (I tried plugging in tau2pole, but to > no avail.) > > What would be the easiest way to construct such a filter in faust? > Suggestions welcome. > > Many thanks, > James > _______________________________________________ Faudiostream-users mailing list Faudiostream-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/faudiostream-users
