[PD] subnormal numbers explained

João Pais jmmmpais at googlemail.com
Wed Apr 3 19:35:51 CEST 2013

I add some very very very low noise to the audio signal, it really doesn't  
affect the audio. something like

[lop~ 5]
[*~ 0.0001]

it's dirty, but it works (?). Do you have any arguments against it?


> Quoth katja, on 13/03/2013 10:14:
>> Subnormal numbers are a pain in the ass, they cause substantially  
>> increased CPU load without doing anything useful for audio DSP.  
>> Unfortunately it can happen in some Pd objects (notably [freeverb~]),  
>> and spoil the performance of a Pd patch.
> Yes I eventually found this out and started putting [freeverb~] in a  
> subpatch with a [env~] connected to [sel 0] and then to a [switch~]  
> object to turn off dsp when the reverb tail has finished. The logic  
> ended up getting quite complicated but it did the job!
> James
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