[music-dsp] Q about compressors
didid at skynet.be
Fri Mar 9 15:56:55 EST 2007
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
> 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
> 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.
> ----- 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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