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| operating system = [[Linux]], [[OS X]], [[Microsoft Windows|Windows]], [[Unix]]
| genre = Functional programming language for audio signal processing
| repo = {{URL|https://github.com/grame-cncm/faust/}}
| programming language = [[C++]]
| license = [[GNU General Public License|GPL]]
| website = {{URL|faust.grame.fr}}
}}
{{Portal|Free and open-source software}}
'''FAUST''' (Functional AUdio STream) is a [[___domain-specific language|___domain-specific]] [[purely functional programming|purely functional]] [[programming language]] for implementing [[signal processing]] [[algorithms]] in the form of [[Library (computing)|libraries]], [[audio plug-ins]], or standalone applications. A FAUST program denotes a signal processor: a mathematical function that is applied to some input signal and then fed out.
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==Example code==
FAUST programs define a <code>process</code> function that operates on incoming data. This is analogous to the <code>main</code> function in most programming languages. The following is an example that produces silence:
<syntaxhighlight lang="haskell">
process = 0;
</syntaxhighlight>
The second example copies the input signal to the output. It involves the <code>_</code> primitive that denotes the [[identity function]] for signals:
<syntaxhighlight lang="haskell">
process = _;
</syntaxhighlight>
Another example sums a stereo signal into a mono signal using the <code>+</code> primitive:
<syntaxhighlight lang="haskell">
process = +;
</syntaxhighlight>
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Using the sequential composition operator <code>:</code> the output of <code>+</code> can be routed to the input of <code>abs</code> to compute the [[absolute value]] of the signal:
<syntaxhighlight lang="haskell">
process = + : abs;
</syntaxhighlight>
Here is an example of parallel composition using the <code>,</code> operator that arranges its left and right expressions in parallel. This is analogous to a stereo cable.
<syntaxhighlight lang="haskell">
process = _,_;
</syntaxhighlight>
These operators can be
<syntaxhighlight lang="haskell">
process = _,0.5 : *;
</syntaxhighlight>
The above may be rewritten in [[currying|curried]] form:
<syntaxhighlight lang="haskell">
process = *(0.5);
</syntaxhighlight>
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{| class="wikitable"
|+ Some architecture files available for FAUST
! File
| alsa-gtk.cpp || ALSA application + GTK▼
! Architecture
|-
▲| alsa-gtk.cpp || ALSA application + [[GTK]]
|-
| alsa-qt.cpp || ALSA application +
|-
| android.cpp || Android applications
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| au.cpp || Audio Unit plug-in
|-
| ca-qt.cpp || CoreAudio application +
|-
| ios-coreaudio.cpp || iPhone and iPad applications
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| jack-gtk.cpp || JACK application + GTK
|-
| jack-qt.cpp || JACK application +
|-
| ladspa.cpp || LADSPA plug-in
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| max-msp.cpp || Max MSP plug-in
|-
| pd.cpp ||
|-
| q.cpp || Q language plug-in
|-
| supercollider.cpp ||
|-
| vst.cpp || VST plug-in
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| year = 2011
}}
* {{cite journal
|first1=Pierre
|last1=Jouvelot
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|url=http://faust.grame.fr/images/faust-doc/papers/faust-elsevier2011.pdf
|year=2011
|volume=37
|issue=3
|pages=113–131
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| year = 2011
}}
* {{cite journal
|first3=Dominique
|last3=Fober
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|url=http://faust.grame.fr/images/faust-doc/papers/faust-CFA-2010.pdf
|year=2010
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
| first3 = Dominique
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| year = 2010
}}
* {{cite journal
|first1=Jérôme
|last1=Barthélemy
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|pages=369–372
|year=2010
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
| first1 = Pierre
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| url-status = dead
}}
* {{cite journal
|first3=Dominique
|last3=Fober
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|url=http://faust.grame.fr/test/images/faust-doc/papers/faustLAC09.pdf
|year=2009
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite book
| first1 = Pierre
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| url = http://smc2009.smcnetwork.org/programme/pdfs/232.pdf
| year = 2009
| archive-date = 2012-04-25
| access-date = 2011-10-11
| archive-url = https://web.archive.org/web/20120425061241/http://smc2009.smcnetwork.org/programme/pdfs/232.pdf
| url-status = dead
}}
* {{cite book
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| year = 2009
}}{{Dead link|date=December 2019 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
|first3=Dominique
|last3=Fober
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|url=http://faust.grame.fr/images/faust-doc/papers/jack-faust-multicore.pdf
|year=2008
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
| first = Albert
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| year = 2004
}}{{Dead link|date=December 2019 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
|first1=Nicolas
|last1=Scaringella
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|url=http://faust.grame.fr/images/faust-doc/papers/JIM2003vect.pdf
|year=2003
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
|first3=Stéphane
|last3=Letz
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|url=http://faust.grame.fr/images/faust-doc/papers/faust-jim2002.pdf
|year=2002
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
* {{cite journal
|first3=Stéphane
|last3=Letz
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|url=http://faust.grame.fr/images/faust-doc/papers/faust-icmc2002.pdf
|year=2002
}}{{dead link|date=December 2016 |bot=InternetArchiveBot |fix-attempted=yes }}
{{Refend}}
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{{Commons category|FAUST (programming language)}}
* {{Official website|faust.grame.fr}}, online compiler, support, documentation, news, etc.
* {{GitHub|grame-cncm/faust}}
[[Category:Audio programming languages]]
[[Category:Programming languages created in 2002]]
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