Oh, here's a version that actually works, and without the one sample delay:
amp_follower_ar(att,rel) = abs <: ((>,at,rt:select2),_:smooth) ~ _ with {
at = tau2pole(att);
rt = tau2pole(rel);
};
And simplified, a bit more generic:
/*****************************************************
lag_ud(up, dn, signal);
Lag filter with separate times for up and down.
*****************************************************/
lag_ud(up,dn) = _ <: ((>,tau2pole(up),tau2pole(dn):select2),_:smooth) ~ _;
/Jonatan
On Sun, Jan 18, 2015 at 4:08 PM, Jonatan Liljedahl <li...@kymatica.com> wrote:
> Hi!
>
> Here's my take on an envelope follower with truly separate attack and
> release times. The release can be shorter than the attack, which is
> not possible with amp_follower_ud from effect.lib
>
> However, it has a built-in delay of one sample. I had to add that
> since the detected state (going up or down) is already delayed, and we
> can't allow any samples into the env filter that doesn't belong to the
> new state (not sure if I'm making myself clear here..)
>
> Any ideas for improvements?
>
> /*****************************************************
> amp_follower_ar(attack, release, signal);
>
> Like amp_follower_ud, but allows release times that are shorter
> than attack time.
> Has a delay of one sample.
> *****************************************************/
>
> amp_follower_ar(att,rel) = abs <: ((_,_,_ <:
> ((_,at,rt:select2),mem:env),_ <: >,_,!) ~ _) : !,_ with {
> env(p,x) = x * (1.0 - p) : + ~ max(x,_) * p;
> at = tau2pole(att);
> rt = tau2pole(rel);
> };
>
>
> --
> /Jonatan
> http://kymatica.com
--
/Jonatan
http://kymatica.com
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