There is no problem in principle with Lagrange interpolation of any order at any modulation speed, because it's FIR interpolation. If there is a divide-by-zero issue, it's probably a bug. If you can find a simple failing case, I'll take a look at it. - Julius
On Thu, Feb 21, 2019 at 2:45 AM Dario Sanfilippo <sanfilippo.da...@gmail.com> wrote: > Thanks, Julius. > > Would the other interpolation algorithms be more stable? For example, the > allpass ones? I'd assume that the linear interpolation one is always stable > and perhaps they could be alright for infrasonic rate modulations. > > Cheers, > Dario > > <http://dariosanfilippo.tumblr.com> > > > On Wed, 20 Feb 2019 at 07:13, Julius Smith <j...@ccrma.stanford.edu> wrote: > >> Did you try -double ? >> >> It sounds like you may be pushing fdelayltv farther than anyone else to >> date, so that could be where the trouble is. We may need to protect it >> from small denominators. >> >> - Julius >> >> On Tue, Feb 19, 2019 at 2:32 PM Dario Sanfilippo < >> sanfilippo.da...@gmail.com> wrote: >> >>> Hello, list. >>> >>> I am experiencing some problems with NANs and I sometimes don't >>> understand where they come from. >>> >>> I have replaced all divisions with the condition that if the divisor is >>> 0, the output is 0, otherwise it is x1/x2. >>> >>> I'm working with a self-oscillating FDN which uses tanh function for >>> stability processing. There are also 6th-order fdelayltv units and the >>> other processing in the system is mainly about 1-pole and 1-p-1-z filters >>> that I have implemented in Faust. So there is arithmetic, some >>> trigonometric functions and some other math like abs, min, max, sqrt and >>> pow. >>> >>> I've tested the tanh function by putting it within a feedback loop with >>> a huge feedback coefficient and it simply clips to 1. >>> >>> Are the fdalyltv likely to produce NANs is the signal setting the delay >>> is not within the expected range? >>> >>> In your experience, what else is likely to produce NANs? >>> >>> Thanks, >>> Dario >>> _______________________________________________ >>> Faudiostream-users mailing list >>> Faudiostream-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/faudiostream-users >>> >> >> >> -- >> >> Julius O. Smith III <j...@ccrma.stanford.edu> >> Professor of Music and, by courtesy, Electrical Engineering >> CCRMA, Stanford University >> http://ccrma.stanford.edu/~jos/ <http://ccrma.stanford.edu/> >> > -- Julius O. Smith III <j...@ccrma.stanford.edu> Professor of Music and, by courtesy, Electrical Engineering CCRMA, Stanford University http://ccrma.stanford.edu/~jos/ <http://ccrma.stanford.edu/>
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