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#1 2008-07-04 16:05:11
- pineapple
- Member
simple noise gate
Has someone a simple noise gate patch to share?
Release (in ms.), threshold (db), hold (in ms.) and attack (in ms.)
Thanks a lot in advance for your help.
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#2 2008-07-04 23:59:49
- nestor
- Member
Re: simple noise gate
One can be built with [env~] and [>~] for the thresholding, [line~] for the attack and decay, and some signal multiplication. This is the kind of thing that is fun to throw together yourself, but I can post one after work...
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#4 2008-07-05 08:03:23
- slur
- Member
Re: simple noise gate
_think_ there is more than one thing wrong with it
attacktime seems to release it too as soon as > fails
because of the |$1 $2(
also dont like how line~ gets its control msgs
just a feeling
need sleep and stuff
pd redefining mathematics |expr fact(0)|==0
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#5 2008-07-07 17:48:52
- nestor
- Member
Re: simple noise gate
_sure_ there is more than one thing wrong with it. ;-)
Just a hasty example of the elements needed for such a thing.
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#6 2008-07-17 15:13:09
- ClaudiusMaximus
- Moderator
Re: simple noise gate
You can get a continuous envelope from the audio signal with:
in
| \
[*~]
|
[lop~ 10]
|
env
then you can turn it into a digital signal with parameters for a low pass filter for attack/release:
threshold attack coefficient
| |
env [dbtopow~] | release coefficient
| | | |
[expr~ $v1>$v2; if($v1>$v2, $v3, $v4)]
| |
d.env coef
next, you can low pass filter to smooth the signal, at different rates for attack/release:
d.env coef
| |
[pd low-pass-filter] -- check Miller's book on how to build filters using czero~ cpole~ etc
|
l.env
then multiply the input by the envelope :)
in l.env
| |
[*~]
|
out
hold time is more tricky to implement, and I'm not quite sure what that means for a noise gate.
I built a compressor/limiter in a similar way, not a very good one, but enough so that if I'm live-coding I can just feed everything into it and not have to worry too much about adjusting the volume to avoid clipping etc.
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#7 2009-01-06 22:32:01
- arif
- Member
Re: simple noise gate
Excuse the naivety, but really how is this any different from a noise gate like so:
input
| \
| [env~]
| |
| [> 60]
| |
| [pack 0 100]
| |
| [vline~]
| |
[*~]
|
[dac~]
Dual 1.8 IBM G5: Mac OSX 10.4.11 -- Asus eeePC 701: Pure:Dyne / eeeXubuntu GNU/Linux -- myspace.com/thearifd
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#8 2009-01-11 05:14:44
- arif
- Member
Re: simple noise gate
bump
Dual 1.8 IBM G5: Mac OSX 10.4.11 -- Asus eeePC 701: Pure:Dyne / eeeXubuntu GNU/Linux -- myspace.com/thearifd
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#9 2009-01-11 08:13:46
- sunji
- Member
Re: simple noise gate
a little noise gate gui, fairly configurable and automatable.
http://www.dafe.lukifer.net/pdpatches/c … nvelope.pd
any technology distinguishable from magic is insufficiently advanced.
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#10 2009-01-11 20:34:50
- arif
- Member
Re: simple noise gate
looks nice, but where does the threshold go?
Dual 1.8 IBM G5: Mac OSX 10.4.11 -- Asus eeePC 701: Pure:Dyne / eeeXubuntu GNU/Linux -- myspace.com/thearifd
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#11 2009-01-12 05:52:15
- sunji
- Member
Re: simple noise gate
I'm sorry, misthought the topic of discussion. I was thinking envelope generator for some reason.
any technology distinguishable from magic is insufficiently advanced.
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#12 2009-01-12 19:16:07
#13 2012-04-10 18:19:39
- felipe.rodriguez
- Member
Re: simple noise gate
ClaudiusMaximus wrote:
You can get a continuous envelope from the audio signal with:
in
| \
[*~]
|
[lop~ 10]
|
env
then you can turn it into a digital signal with parameters for a low pass filter for attack/release:
threshold attack coefficient
| |
env [dbtopow~] | release coefficient
| | | |
[expr~ $v1>$v2; if($v1>$v2, $v3, $v4)]
| |
d.env coef
next, you can low pass filter to smooth the signal, at different rates for attack/release:
d.env coef
| |
[pd low-pass-filter] -- check Miller's book on how to build filters using czero~ cpole~ etc
|
l.env
then multiply the input by the envelope :)
in l.env
| |
[*~]
|
out
hold time is more tricky to implement, and I'm not quite sure what that means for a noise gate.
I built a compressor/limiter in a similar way, not a very good one, but enough so that if I'm live-coding I can just feed everything into it and not have to worry too much about adjusting the volume to avoid clipping etc.
wow, that's elegant.
[mavg] is too cpu expensive? or at least more expensive than [*~] and [lop~]? I use [mavg] when need a smoother signal.
well, thankyou very much Claudius Optimus et Maximus.
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