I think it’s the type of low pass filter that you have inserted that is the problem. Si.smooth Is an iir, and it’s phase response will cause issues with the tuning I think. There are other variations of low pass filter that you can use that will be better in this respect
On Wed, 14 Oct 2020 at 07:40, Romain Michon <rmnmic...@gmail.com> wrote: > Ah, that makes more sense. First thing first, nMax should be a fixed > number and you're lucky that your code actually works ;). As for the > tuning, that's one of the things with waveguide models: their tuning often > has to be adjusted "by hand." This is due to the fact that extra delay is > added by the various filters in the algorithm. So your best bet here is to > adjust the tuning using an external oscillator and comparing the produced > pitch to it. > > Cheers, > > Romain > > On Tue, Oct 13, 2020 at 11:44 PM Rich Cochrane <rich.cochr...@bigi.org.uk> > wrote: > >> Thanks to both of you for replying -- it was probably unhelpful of me not >> to post the whole code, which I'm attaching here. The whole thing does >> produce a note, but the pitch is off (octaves are very flat). >> However, asking you to pick my altered version of someone else's code isn't >> very reasonable. >> >> Romain -- I'll look at the example you suggested, I imagine that's a >> better starting-point anyway. >> >> Cheers, >> >> Rich >> >> On Tue, Oct 13, 2020 at 3:10 PM Romain Michon <rmnmic...@gmail.com> >> wrote: >> >>> Hi Rich, >>> >>> This indeed won't make any sound. The waveguide object of the physical >>> modeling library in Faust is just 2 delay lines in parallel : it's just a >>> simple waveguide without terminations. For a simple string example, have a >>> look at the openString function: >>> https://github.com/grame-cncm/faustlibraries/blob/master/physmodels.lib#L471 >>> >>> Cheers, >>> >>> Romain >>> >>> On Sat, Oct 10, 2020 at 4:05 AM Julius Smith <julius.sm...@gmail.com> >>> wrote: >>> >>>> Hi Rich, >>>> >>>> I am not familiar with this code, but thanks for the pointers. >>>> >>>> You have the right idea. ma.SR/freq needs to equal the round-trip >>>> delay up and down the waveguide, adding up all delay line lengths, all >>>> filter delays, and the feedback delay from the Faust compiler (there's >>>> always at least one sample of that in any closed loop). >>>> >>>> Cheers, >>>> Julius >>>> >>>> On Fri, Oct 9, 2020 at 6:55 AM Rich Cochrane <rich.cochr...@bigi.org.uk> >>>> wrote: >>>> >>>>> Hello, >>>>> >>>>> I'm trying to learn Faust's physical modeling features "by >>>>> experimentation" so am blundering around a bit. >>>>> >>>>> I found the last example on this page comprehensible: >>>>> "Waveguide-Strings in Faust": >>>>> https://hvc.berlin/Sound_Synthesis/Physical_Modeling/physical-modeling-faust-examples/ >>>>> >>>>> I wanted to be able to play it with a keyboard. I thought this might >>>>> work: >>>>> >>>>> segment(pos) = waveguide(nMax,n) >>>>> with{ >>>>> nMax = ma.SR/freq; >>>>> n = pos * nMax; >>>>> }; >>>>> >>>>> Where freq is the usual frequency value triggered by a MIDI keyboard. >>>>> But the result is a long way out of tune. >>>>> >>>>> I tried "nMax = freq : pm.f2l : pm.l2s;" instead but this appears to >>>>> have the same net effect -- at least, it's also out of tune. >>>>> >>>>> What's the proper way to do this? Or is this base code not the right >>>>> starting point for this? >>>>> >>>>> Cheers, >>>>> >>>>> Rich >>>>> >>>>> >>>>> _______________________________________________ >>>>> Faudiostream-users mailing list >>>>> Faudiostream-users@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/faudiostream-users >>>>> >>>> >>>> >>>> -- >>>> "Anybody who knows all about nothing knows everything" -- Leonard >>>> Susskind >>>> _______________________________________________ >>>> Faudiostream-users mailing list >>>> Faudiostream-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/faudiostream-users >>>> >>> >>> >>> -- >>> >>> Romain Michon >>> +33 (0)7 67 39 72 40http://grame.fr/~michon >>> >>> > > -- > > Romain Michon > +33 (0)7 67 39 72 40http://grame.fr/~michon > > _______________________________________________ > Faudiostream-users mailing list > Faudiostream-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/faudiostream-users >
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