Envelope generator: Difference between revisions

[[File:ADSR parameter.svg|thumb|300px|The amplitude over time of an ADSR envelope. Only the positive half of the signal is shown.]] Sound synthesis techniques often employ an '''envelope generator''', '''contour generator''' or '''transient generator''' that controls some parameters of a signal or control voltage at any point in its duration. When it controls a [[VCA]] these together form an envelope shaper or loudness contour.<ref>''Synthesizers for musicians'' by R A Penfold, PC Publishing, 1989, {{ISBN |1-870775-01-5}}, p.21</ref><ref>''Beginning Synthesizer'' by Helen Casabona, David Frederick, Tom Darter, Alfred Publishing Company Inc, 1986, {{ISBN |0882843532}}</ref>

Most often the envelope generator is an ADSR (Attack Decay Sustain Release), which may be applied to overall [[amplitude]], [[frequency]], or [[Voltage controlled filter|filter]]. It is usually triggered by a [[gate]] signal from the keyboard.<ref name="q109">Synthesizers.com [httphttps://wwwweb.archive.org/web/20130622031327/http://synthesizers.com/q109.html Q109 Envelope Generator]</ref>

For shorter envelopes at higher [[pitch]], as happens in [[acoustic instruments]], a master [[CV]] is taken from the same voltage as used for [[VCO]] pitch.<ref>Description of the [https://web.archive.org/web/20120815070312/http://www.cgs.synth.net/modules/cgs116_env.html Serge Extended ADSR Envelope Generator]</ref>

* ''The Complete Guide to Synthesizers'' by Devarahi, Prentice Hall, 1982, {{ISBN |0-13-160630-1}}, pages 74-9174–91

* [https://web.archive.org/web/20130725070530/http://www.synthesizers.com/egpunch.html Q109 Envelope Generator Punch]

* [https://githubweb.comarchive.org/micjamkingweb/synth-secrets20190430214247/blobhttps:/master/part-3www.mdsoundonsound.com/techniques/modifiers-controllers Synth Secrets, Part 3: Modifiers & Controllers] by Gordon Reid, Sound on Sound, Jul 1999 - archived

* [https://githubweb.comarchive.org/micjamkingweb/synth-secrets20190422232353/blobhttps:/master/part-7www.mdsoundonsound.com/techniques/envelopes-gates-triggers Synth Secrets, Part 7: Envelopes, Gates & Triggers] by Gordon Reid, Sound on Sound, Nov 1999 - archived

* [https://githubweb.comarchive.org/micjamkingweb/synth-secrets20180902014325/blobhttps:/master/part-8www.mdsoundonsound.com/techniques/more-about-envelopes Synth Secrets, Part 8: More About Envelopes] by Gordon Reid, Sound on Sound, Dec 1999 - archived

* Muff's Modules & More Forum:[https://www.muffwigglermodwiggler.com/forum/viewtopic.php?t=83193 CEM3310 equivalent circuit], Mod Wiggler forum, Apr 2013

* MFOS [httphttps://wwwweb.archive.org/web/20190614005053/http://musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=ADSR001%2FADSR001252FADSR001.html&MAINTAB=SYNTHDIY&VPW=1150&VPH=777 ADSR Envelope Generator]

* MFOS [httphttps://wwwweb.archive.org/web/20190614005048/http://musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=DUALARGENERATOR%2FDUALARGENERATOR252FDUALARGENERATOR.html&MAINTAB=SYNTHDIY&VPW=1150&VPH=777 Dual Attack Release Envelope Generator]

* [https://web.archive.org/web/20120815070312/http://www.cgs.synth.net/modules/cgs116_env.html Serge Extended ADSR Envelope Generator]

'''==== Readily available analogue IC and discrete component based''' ====

* ''[https://driveweb.googlearchive.comorg/fileweb/d20190613221410/0Bx5_5krPS9HMcThRRHRObjRwMUkhttps://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf ADSR the Easy Way]'' by Thomas Henry, Polyphony, March/Apil 1982, pp. &nbsp;22,23,30,3I.