[sdiy] Enveloppe follower

[Peter Pearson]

Wouldn't that be the same idea as the Buchla 296?

On Thu, Dec 5, 2019 at 11:59 AM Richie Burnett <rburnett at richieburnett.co.uk>
wrote:

> Spectral centroid agrees well with human perception of "brightness" if
> that's really what the OP is after. But that's not an envelope follower!
>
> -Richie,
>
> Sent from my Xperia SP on O2
>
> ---- Dave Magnuson wrote ----
>
>
>
>
>
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> *On Behalf Of *Florian
> Anwander
> *Sent:* Thursday, December 5, 2019 11:13 AM
> *To:* synth-diy at synth-diy.org
> *Subject:* Re: [sdiy] Enveloppe follower
>
>
>
> Hi Jean
>
> Am 04.12.19 um 17:31 schrieb Jean Bender:
>
> discovered that most of them was pretty good for following musical
>
> instruments signals, but not so much for more electronic audio
>
> signal..
>
> I mean, i play a lot of ambient and noise stuff, including sounds
>
> without so much attack, even if they have some relief.
>
>
>
> And that's my point :  i'd like to build myself an enveloppe follower
>
> able to be really subtle, and able to be effective even on droning
>
> sounds...
>
> So where should i take a look ? What i have to be careful of ?
>
> Brian wrote all the theory already.
>
> Your main problem is: drones typically don't have a significant change in
> amplitude. On the other side: drones often change the colour of sound, the
> spectrum.
>
> So I think you don't need a simple envelope-Follower, but you might need
> something more complex. I could imagine something like the analysis section
> of a vocoder, with an circuit after it, that outputs a voltage that
> corresponds to the frequency range or frequency weight.
>
> I did not think it completely over, but a first attempt might look like
> this:
>
> A state-variable-filter splits the signal in two signals: high and low.
> Both signals then are fed through an  envelope follower each. Now the
> output voltages of the two env-followers are subtracted. The result would
> be something like:
>
>    - full frequency-spectrum = 0V
>    - only high frequencies = +maxV
>    - only low frequencies = -maxV
>
> I am not sure, whether the result is really interesting or usable, but it
> might be worth a try.
>
>
>
> Florian
>
>
>
> I think Florian has a great point regarding spectrum versus loudness.
>
>  I wonder (brainstorming) if something akin to a “color organ” would be
> interesting here, too?     Divide the input into 3-4 frequency bands and
> provide an envelope follower on each.
>
> Then you could mix / match use each output in a different manner?
>
> Dave
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