Re: [LAD] (Modular) Synth and Clipping

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To: Aurélien Leblond <blablack@...>
Cc: Linux Audio Developers <linux-audio-dev@...>
Date: Sunday, June 16, 2013 - 10:57 am

Hi Aur=C3=A9lien,

>- What method of clipping is used will give a "personality" to the

from my experience, there are two main factors determining the
character of waveshaping distortion: one is the hardness of the
clipping transition, the other its +/- symmetry.

A perfectly symmetric clipping function will generate only odd-order
harmonics. Breaking the symmetry gives rise to even-order harmonics,
easily achieved for example through the simple addition of a DC offset
before clipping. At high gain, the degree of symmetry of the clipping
function becomes much more important to the "personality" of the sound
than the softness of the clipping transition.

>- Soft clipping will deform any waves of amplitude -1/1 even if it

You should also consider asymptotic functions, atan for example, that
can be used for clipping with a 'soft' ceiling, never reaching total
saturation. I prefer their sound, but the difference can be subtle.

>- Is there a preferred stage for clipping? In the case of a filter,

The heart of many distortion pedals is a clip|filter|clip chain, but
there are so many ways to vary or extend the scheme. For example, an
interesting approach to digital ladder filters wedges saturation
circuitry between the filter stages.

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Messages in current thread:
[LAD] (Modular) Synth and Clipping, Aurélien Leblond, (Sat Jun 15, 1:56 pm)
Re: [LAD] (Modular) Synth and Clipping, Tim Goetze, (Sun Jun 16, 10:57 am)
Re: [LAD] (Modular) Synth and Clipping, Fons Adriaensen, (Sun Jun 16, 11:58 am)
Re: [LAD] (Modular) Synth and Clipping, Dominique Michel, (Sat Jun 15, 6:50 pm)
Re: [LAD] (Modular) Synth and Clipping, John Rigg, (Sat Jun 15, 8:34 pm)
Re: [LAD] (Modular) Synth and Clipping, Dominique Michel, (Sat Jun 15, 9:33 pm)
Re: [LAD] (Modular) Synth and Clipping, John Rigg, (Sun Jun 16, 10:59 am)
Re: [LAD] (Modular) Synth and Clipping, Dominique Michel, (Sun Jun 16, 7:15 pm)
Re: [LAD] (Modular) Synth and Clipping, Fons Adriaensen, (Sat Jun 15, 9:24 pm)
Re: [LAD] (Modular) Synth and Clipping, John Rigg, (Sat Jun 15, 4:22 pm)