[CM] piano.scm

eichhoff at statistik.uni-dortmund.de eichhoff at statistik.uni-dortmund.de
Sun Jul 19 09:03:40 PDT 2009

By the way, who has written the piano.scm file or piano.ins? "Scott Van
Duyne" model is written there. He has written the program, too? I ask
myself how to get to the "table" numbers and what each number means:

:detuningFactor-table '(24 5 36 7.0 48 7.5 60 12.0 72 20 84 30 96 100 108
:stiffnessFactor-table '(21 1.5 24 1.5 36 1.5 48 1.5 60 1.4 72 1.3
84 1.2 96 1.0 108 1.0)

Is it possible (as far as you know) to get such factors from real
instruments or are they more artificial and a bit far away from "real
physics"? I have a classical guitar model written in MATLAB where I put in
the string length, density, Youngs Modulus etc. and the output is a tone
in .wav. There I have a direct connection from physical changes (plucking
place etc.) to physics. But if I look at the piano model I see such tables
and factors... but the commuted piano model on which it is based is called
a "physical model". When is a model called "physical"? If it's based on
the wave equation somewhere?

I like to create tones (guitar: plucked at random places (e.g. normal
distributed), piano (vary some parameters) etc.) to get many tones with
which I can do my classification and later to consider the instrument
recognition from short pieces of music. That's why I am looking for
physical models, because there are parameters that can be varied.

There are good physical models (-> pianoteq), but the question is: how god
has a model to be that it's good enough for classification later...
Perhaps I will try it first with this model and if it's too bad for it, I
have to go on searching... or to use pianoteq.

Or do you know other piano-models (saxophone also sounds a bit strange in
comparison to real saxophones)?

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