<div dir="ltr">Wouldn't that be the same idea as the Buchla 296?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 5, 2019 at 11:59 AM Richie Burnett <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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!<br><br>-Richie,<br><br>Sent from my Xperia SP on O2<br><br>---- Dave Magnuson wrote ----<br><br><div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b>From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>> <b>On Behalf Of </b>Florian Anwander<br><b>Sent:</b> Thursday, December 5, 2019 11:13 AM<br><b>To:</b> <a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br><b>Subject:</b> Re: [sdiy] Enveloppe follower<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p>Hi Jean<u></u><u></u></p><div><p class="MsoNormal">Am 04.12.19 um 17:31 schrieb Jean Bender:<u></u><u></u></p></div><blockquote style="margin-top:5pt;margin-bottom:5pt"><pre>discovered that most of them was pretty good for following musical<u></u><u></u></pre><pre>instruments signals, but not so much for more electronic audio<u></u><u></u></pre><pre>signal..<u></u><u></u></pre><pre>I mean, i play a lot of ambient and noise stuff, including sounds<u></u><u></u></pre><pre>without so much attack, even if they have some relief.<u></u><u></u></pre><pre><u></u> <u></u></pre><pre>And that's my point : i'd like to build myself an enveloppe follower<u></u><u></u></pre><pre>able to be really subtle, and able to be effective even on droning<u></u><u></u></pre><pre>sounds...<u></u><u></u></pre><pre>So where should i take a look ? What i have to be careful of ?<u></u><u></u></pre></blockquote><p>Brian wrote all the theory already.<u></u><u></u></p><p>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.<u></u><u></u></p><p>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.<u></u><u></u></p><p>I did not think it completely over, but a first attempt might look like this:<u></u><u></u></p><p>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:<u></u><u></u></p><ul type="disc"><li class="MsoNormal">full frequency-spectrum = 0V<u></u><u></u></li><li class="MsoNormal">only high frequencies = +maxV<u></u><u></u></li><li class="MsoNormal">only low frequencies = -maxV<u></u><u></u></li></ul><p>I am not sure, whether the result is really interesting or usable, but it might be worth a try.<u></u><u></u></p><p><u></u> <u></u></p><p>Florian<u></u><u></u></p><p><u></u> <u></u></p><p>I think Florian has a great point regarding spectrum versus loudness. <u></u><u></u></p><p> 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. <u></u><u></u></p><p>Then you could mix / match use each output in a different manner?<u></u><u></u></p><p>Dave<u></u><u></u></p></div>_______________________________________________<br>
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