[PD] smoothing things ...

[ix at replic.net]

> curves. Another prerequisite is that the filter is
> able to recognise parameter jumps that exceed a
> certain threshold and doesn't interpolate these jumps.
> I realise that this is probably impossible to
> accomplish.

certainly not impossible, dynamics compressors/expanders operate on this concept, only mangling the signal when (or when there isnt) an abrupt change. most of them use a small blocksize-or-two lookahead to get better results.. maybe you want to involve a gate of some sort, and flip on and off the lowpass/interpolation/compression depending on some threshold of recent change..

>  
> > a simple non-linear (IIR) low-pass filter is
> > x[n]=a*x[n-1]+(1-a)*y[n]
> > (with 0<=a<=1)
> So this would basically be lop~ , but not in the
> frequency domain? I'm a bit confused about the y[n],
> shouldn't that be x[n] as well?
> Sorry, I'm totally new to this ...
> 
> thank you,
> thoralf (quite confused).
> 
> 
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