Nyquist Audio Programming

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Revision as of 19:25, 3 July 2012 by Galeandrews (talk | contribs) (audacity.SF.net "Download Nyquist Plug-ins" no longer has plug-in lists (and changing this to an ednote))
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This page is a list of suggested "how-to" and explanatory articles for Nyquist programmers. Nyquist is a LISP-based programming language for audio synthesis and analysis written by Roger B.Dannenberg. A number of effects and analysis tools shipped with Audacity are written in Nyquist. Audacity interfaces to Nyquist using the somewhat stripped-down and modified Libnyquist library.
Many articles herein are still to be written. Feel free to request other topics by clicking the discussion tab at the top of this page. If you are looking for extra Nyquist plug-ins to use, see Nyquist Plug-ins.
Related article(s):

If you are especially interested in Nyquist in Audacity, we strongly recommend subscribing to our audacity-nyquist mailing list .

Basic Experiments

Experiments from the Audacity Nyquist prompt:

Advanced topics

Please note: The notation in the current Nyquist 3.02 Reference Manual from the links above emphasizes SAL syntax, although the underlying functions are the same. SAL only works in Audacity 1.3.8 or later.

Use the Nyquist 2.37 Manual from the links above if you would like to see functions described using LISP syntax. These work in any Audacity version.

We are currently working on unifying the old Nyquist plug-in documentation on the main Audacity web site and the updated information in the German forum into one single place here in the Wiki. The outdated list of Nyquist plug-ins at http://audacity.sourceforge.net/download/nyquistplugins has now been removed. The only disadvantage of this is that the potential (unused) mechanism for translating the plug-ins list is lost. Translating the list was never a priority as the plug-ins themselves are in English. Possibly we could in time add (at least, German) translations of Wiki Nyquist pages, or even links to German versions of these plug-ins?

Very advanced topics

  • Multiple echoes with different delay times - reverb effect
  • The relations between timeshift and frequency response
  • Frequency-dependent delays with comb and allpass filters - reverb, chorus, phaser, etc.
  • Dynamics processing - how to derive control signals from volume behaviour
  • Auto-equalizing - how to derive control signals from frequency behaviour