[PD] overdriven speaker

Mathieu Bouchard matju at artengine.ca
Mon Oct 18 16:23:21 CEST 2010

On Sat, 16 Oct 2010, Martin Schied wrote:

> field) and also time variant (temperature) and modulation (doppler 
> effect / amplitude modulation) effects. I don't know which effects have 
> a stronger or weaker influence,

for a sinewave, a peak of ±1 millimètre at 1 kiloHertz travels like

   y = 0.001*sin(2000πt)  mètres
   dy/dt = 2π*cos(2000πt) mètres/seconde

so, the peak speed is ±2π m/s while the speed of sound is roughly 343 m/s, 
thus the doppler effect would be ±1.83 %, creating a vibrato of ±32 cents, 
but this vibrato is so fast, that it actually sounds like something else, 
because it runs at the same frequency as the input signal.

I tried it, and it sounds like related to waveshaping (although it's not). 
So maybe that's closer to what "fallen_devil" wants, because it has a 
quite richer sound than the usual [expr~ tanh($v1)].

I did it using [vd~]. (I imagine that I will soon retry with a natural 
spline version of it...)

| Mathieu Bouchard ------------------------------ Villeray, Montréal, QC

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