HI GW, I would use this method (simple fi.tf2() biquad allpasses in series):
https://www.researchgate.net/publication/224106863_Robust_Efficient_Design_of_Allpass_Filters_for_Dispersive_String_Sound_Synthesis @ARTICLE{AbelAndSmithDAFX06, AUTHOR = "Jonathan Abel and Julius O. " # Smith3, TITLE = "Robust Design of Very High-Order Allpass Dispersion Filters", JOURNAL = dafx06, MONTH = sep, YEAR = 2006 } Cheers, - Julius On Fri, May 28, 2021 at 1:00 PM Gary Worsham <gary.wors...@gmail.com> wrote: > Sorry if this is a repeat but I've just signed up for the mailing list > again, and previous submissions said "you're not registered"... maybe I'm > in some sort of limbo at the moment. > ================================= > I'm interested in messing with some structures suggested by Julian > Parker's work on spring reverb emulation. > https://acris.aalto.fi/ws/portalfiles/portal/13004391/art_10.1155_2011_646134.pdf > > This paper suggests an "interpolating all-pass delay". Initially, I don't > think I would care about modulating these in real time, but of course, > everything is better with envelope modulation so I'd probably try that > eventually. > > The library includes a handful of all passes and of course I can try all > of them, but wondering if a particular one would be particularly swell for > this kind of thing. > > > https://faustcloud.grame.fr/doc/libraries/index.html#thiran-allpass-interpolation > > https://faustcloud.grame.fr/doc/libraries/index.html#fi.allpass_comb > > https://faustcloud.grame.fr/doc/libraries/index.html#fi.allpass_fcomb > > > https://faustcloud.grame.fr/doc/libraries/index.html#fi.allpass_fcomb5-and-fi.allpass_fcomb1a > > Note that I did some experiments in the past with this sort of thing on a > Spin FV-1 and found that chirp block lengths in the 12 to 20 samples range > (at 32768 Hz fs) seemed to work well for this sort of thing. However, the > FV-1 doesn't have enough instructions to generate a very long chirp. I am > really looking to emphasize the dispersion "chirp" in this particular > exercise. > > Thanks! > > GW > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> > <#m_3768652731459431734_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > 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
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