Re: [Audacity-nyquist] van der pol equation was Gliding Stretch Plugin?

[paul b. <sni...@fa...>]

Hello David,

This quick MP3 mimicks radio squeal by changing the sine frequency. 
http://www.proviewlandscape.com/prop/chaos.mp3
The frequency change might be a doppler effect where the properties of
the ionisphere change as the earth rotates. It does not sound exactly
like a frequency sweep since this is nonlinear and causes amplitude
modulation. 

Paul

On Fri, 9 Nov 2007 07:06:27 -0800 (PST), "David R. Sky"
<dav...@sh...> said:
> Hi paul,
> 
> What's the van der pol equation used for in audio?
> 
> Thanks
> 
> David
> 
> On Fri, 9 Nov 2007, paul beach wrote:
> 
> > Hello
> >
> > This is one of the shorter versions of the Van der Pol equation,
> >
> > Amplitude =  a cos phi - ( e a^3 / 32 ) sin 3 phi
> >
> > Where a = 0.1 * exp(t/2) /sqrt ( 1 + 0.1^2 / 4 * exp(t*10 - 1
> > ))(exp(t/2) / ( t + 1))
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> >
> 
> -- 
> David R. Sky
> http://www.shellworld.net/~davidsky/
> 
> 
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  paul beach
  sni...@fa...