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.

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.

Excuse the naivety, but really how is this any different from a noise gate like so:

input
| \
| [env~]
| |
| [> 60]
| |
| [pack 0 100]
| |
| [vline~]
| |
[*~]
|
[dac~]

bump

a little noise gate gui, fairly configurable and automatable.

http://www.dafe.lukifer.net/pdpatches/crazymachineredux/envelope.pd

looks nice, but where does the threshold go?

I'm sorry, misthought the topic of discussion. I was thinking envelope generator for some reason.

maybe [threshold~]

LP

@ClaudiusMaximus said:

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.

Please could someone post an example patch of a noise gate that's easy for a newbie to understand? I can't get wither of the above to work correctly...

Thanks

there's one in the DIY2 library

check out mono-gate or st-gate

http://puredata.hurleur.com/sujet-1982-diy2-effects-sample-players-synths-sound-synthesis