[music-dsp] Q about compressors

[Didier Dambrin]

thanks to everyone, that made things a bit clearer





> Hi Didier
>
> I have always used dBs for the gain, and the TimeConstant units for 
> envelope response, just because when I was studying analog compressors in 
> the dark ages, that was the conventional terminology in papers/books I 
> found.
>
> Bogac's advice and references look good.
>
> I think of the ratio simplistically like: If the ratio is 10:1, then if 
> the input goes up 10 dB, the output goes up only 1 dB. The gain in the 
> circuit or algorithm is just arranged to do whatever is necessary to 'make 
> that happen'. Maybe that only seems 'natural' because it is old habitual 
> thought.
>
> On the TimeConstant thing, if one expects that a 10 ms attack means that 
> the attack envelope will rise to 63% of its ultimate value in 10 ms, and 
> rise to 86% of its value in 20 ms, etc, then that also makes sense. 
> Perhaps that old definition of the attack and release knob-markings has 
> evolved to mean something different on modern compressors, dunno.
>
> I only thread-drift into the TimeConstant topic because it might be viewed 
> as 'unintuitive' as the dB thing.
>
> JCJR
>
> ----- Original Message ----- 
> From: "Didier Dambrin" <didid at skynet.be>
>
>> so you do multiply the gain in dB, that is, past the threshold, a 3:1 
>> will divide the gain in dB by 3, that's what I find weird. It's as weird 
>> as adding in the linear scale.
>
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