[PD] selecting triggers once with env~?

[Oded Ben-Tal via Pd-list]

There is a rest detection example in the Pd-help patches which you may want to
look at (depending on what exactly is it you're trying to achieve). 


On Tue, 10 Jun 2014 09:39:27 +0200, IOhannes m zmoelnig via Pd-list wrote
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> On 2014-06-10 08:30, Roman Haefeli via Pd-list wrote:
> > On Mon, 2014-06-09 at 19:53 -0700, Ronni Montoya via Pd-list
> > wrote:
> >> Hi, im tracking the amplitude of my signal with ~env and i need
> >> to send one trigger when my ~env gives 0 , the problem is that if
> >> i do:
> >> 
> >> ~env | select 0
> >> 
> >> 
> >> It send a lot of triggers when my ~env is in 0 and i need to send
> >> just one trigger.
> >> 
> >> any idea how can i send only one trigger ?
> > 
> > There is [change] which only lets changing values pass. Something
> > like this should work:
> > 
> > [env~ ] | [change] | [select 0]
> 
> though in practice you might want to add some additional filtering
> before [change].
> [env~] will give you loads of slightly different values, even when 
> you feed it a rather "constant" signal like a sine:
> e.g.: [osc~ 440] | [env~] | [change] | [print]
> 
> i'd suggest doing something like
> 
> |
> [env~]
> |
> [> 30]
> |
> [change]
> |
> 
> which will give you 0 or 1, instead of the amplitude.
> 
> fgmasdr
> IOhannes
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___________________________________________________
Oded Ben-Tal
http://ccrma.stanford.edu/~oded
oded at ccrma.stanford.edu