Howto generate non linear tones ?

Special Interest Groups Audio Processing
1

Héllo,

How can I use Audacity to generate tones which are nolinear based ?

Here some samples draw that I want to generate :
goldenGenerator_square.png
goldenGenerator_sine_half.png
goldenGenerator_sinusoide.png
goldenGenerator_triangle.png

2

Do you have an equation for the waveform ? … https://forum.audacityteam.org/t/expression-generator/45227/1

Or an example you can copy … https://forum.audacityteam.org/t/arbitrary-wavetables/48262/1

3

The first one is easy using “Nyquist” scripting.

Apply this code via the “Nyquist Prompt” effect (See: Nyquist Prompt - Audacity Manual)

(setf bias 0.5)
(setf hz 100)
(setf amplitude 0.8)
(scale amplitude (osc-pulse hz bias))



  • “bias” controls the pulse width and should be between -1 and +1, giving a pulse width from 0% (always at -1) to 100% (always at +1). When bias is zero, a square wave is generated.
  • “hz” controls the frequency.
  • “amplitude” controls the amplitude (0 to 1)

For more complex examples, as Trebor wrote, see this plug-in: Expression Generator - #2 by steve
It is a “Nyquist plug-in”.
Installation instructions for Nyquist plug-inson Linux: https://manual.audacityteam.org/man/installing_effect_generator_and_analyzer_plug_ins_on_linux.html#nyquist_install