In case it's of interest, I implemented a piano model some years ago for a course. The code is here:
https://github.com/radarsat1/stk-piano It's a bit old so ymmv. It would be cool to port it to Faust ;) cheers, Steve On Mon, May 27, 2019, 9:55 AM Scott R. Looney <scottrloo...@gmail.com> wrote: > thanks Julius! i'll see what i can find out on this front when i have some > time. i'm not interested in a toy piano per se but a moderately accurate > standard piano string model. actually in my web research i was surprised > not to see very much out there in terms of useable code demos. there's > loads of useful information on CCRMA in your amazing and excellent free > book, but i'm a total math dunce - as in 'dragged myself kicking and > screaming through algebra' math dunce. > > so i'm looking for an existing object (Csound opcode, PD object (not Max > object), C++ i could possibly port, Faust code) that has a moderately > convincing real time piano string model. about the best example i found is > this object for ChucK called Sympia, by Julian Faust ( > https://sites.google.com/site/julianfaust/projects/coupled-piano-strings). > there's also the prepiano opcode and the ppiano~ object in Max from Stefan > Bilbao but that's a prepared piano not a standard one. i found a Ruby based > physical model from Scott Van Duyne (with additive synthesis i think) here: > https://ccrma.stanford.edu/software/snd/snd/piano.rb > > i'm imagining you're likely familiar with all of these, as well as most of > the papers on the subject. > > so if i'm starting from Romain's examples in the faustlib, the closest one > i can think of is this one, the steel string model. i found the code in the > library folder: > > elecGuitar_ui_MIDI = > elecGuitar(stringLength,pluckPosition,1,gain,gate)*outGain > with{ > f = hslider("v:elecGuitar/h:[0]midi/[0]freq[style:knob]",440,50,1000,0.01); > bend = > hslider("v:elecGuitar/h:[0]midi/[1]bend[hidden:1][midi:pitchwheel][style:knob]" > ,1,0,10,0.01) : si.polySmooth(gate,0.999,1); > gain = hslider("v:elecGuitar/h:[0]midi/[2]gain[style:knob]",0.8,0,1,0.01); > s = hslider("v:elecGuitar/h:[0]midi/[3]sustain[hidden:1] > [midi:ctrl 64][style:knob]",0,0,1,1); > pluckPosition = hslider("v:elecGuitar/[1]pluckPosition[midi:ctrl > 1]",0.8,0,1,0.01) : si.smoo; > outGain = hslider("v:elecGuitar/[2]outGain",0.5,0,1,0.01); > t = button("v:elecGuitar/[3]gate"); > gate = t+s : min(1); > freq = f*bend; > stringLength = freq : f2l; > }; > > but it seems to me that a piano string would be stiffer and of course > have between one and three actual strings played by a struck hammer for a > designated pitch, rather than a pluck. i do know that Romain has physical > components - his Bi-Directional Utilities and Elements in the physmod > library could likely be applicable but i have no idea how to hook these > together. i'm figuring it's not as easy as just running this example > through a dispersion allpass filter. i did find this lecture by Romain > which might contain some clues worthy of study: > https://ccrma.stanford.edu/~rmichon/faustTutorials/#simple-virtual-string-example > > my eventual goal is to use this as a starting point for creating an > instrument that would be controllable inside PD that would be able to > explore further boundaries timbrally and expressively beyond that of > 'semi-accurate piano string model'. i have had some creative fun in PD with > a percussively-oriented Karplus model i found which i duplicated three > times and added a Spread control to detune the frequencies of the allpass > which occasionally can sound barely like a honky tonk piano in certain > registers. i did also find a PD object that is a port of a Mutable > Instruments oscillator module called Plaits that has a stiff string model > in it. i looked through the code and it does appear to reference a > dispersion allpass filter. it's definitely not trying to sound like a piano > string, but does have variable inharmonicity. > > at any rate, any help you or anyone can offer is certainly appreciated! > > best, > scott > > On Sat, May 25, 2019 at 2:40 PM Julius Smith <j...@ccrma.stanford.edu> > wrote: > >> Hi Scott, >> >> I added the piano dispersion filter to the library because it was so >> easy to encapsulate that nice paper (cited in the comments) in >> ready-to-use form. We should all do this! I'm not using it yet >> myself, but I hope to when I circle back around to piano modeling. If >> you send me a clean toy piano example without a dispersion filter in >> its waveguide strings, I'll send it back to you with a tested >> dispersion filter installed, and I'll add it to the examples if nobody >> objects. >> >> Romain Michon has written many examples with strings, so I'd start >> with (or just find) one of those. >> >> Cheers, >> - Julius >> >> On Tue, May 21, 2019 at 10:51 AM Scott R. Looney <scottrloo...@gmail.com> >> wrote: >> > >> > hey there, just joined the list and i am a complete newbie to FAUST, >> having attended a one day seminar about two years ago @ CCRMA. additionally >> i have no math skills to speak of and only a smattering of programming >> experience in C++ - i mostly script in C#. >> > >> > so, i was wondering if some generous soul were working on modelling >> piano strings and used the dispersion filter in FAUST in a working example. >> i can see the filter listed there and its ostensible usage, but i have >> absolutely no clue how to apply it. i would like to use it to model both a >> normal string behavior as well as being able to tweak, twist and mangle the >> output to get more unusual results. >> > >> > i'm not feeling a lot of interest in the list, as i searched for >> 'dispersion' and came up with exactly one mention - when the filter code >> was incorporated into the FAUST library, which was about 11 years ago. >> would be really nice if someone made an example piano instrument to play >> around with, but i'm not holding out a lot of hope.... >> > >> > best, >> > scott >> > _______________________________________________ >> > 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/ >> > _______________________________________________ > Faudiostream-users mailing list > Faudiostream-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/faudiostream-users >
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