[sdiy] software wavefolding

[Chris Muir]

On Mar 13, 2012, at 10:45 AM, Scott Nordlund wrote:

> The most common software waveshaping technique uses Chebyshev polynomials. You can also use a sine and consider it a special case of FM. I think digital waveshaping isn't done so much since it's often prone to aliasing, and because it's not really very flexible or intuitively controllable. It was explored some in the 60s and 70s, but largely abandoned in favor of FM. Miller Puckette has recently made a guitar signal processor that performs waveshaping on analytic signals (i.e. independent of amplitude), so I think it still has some potential. 		 

The Buchla 259e Twisted Waveform Generator is based on this sort of waveshaping, and yes there is some aliasing involved at some settings. It has some really great timbres available, though. It got a bad rap early in the 200e saga because of the aliasing, but has remained popular in the Buchla community in spite of that, or maybe even because of it. I love mine.

– C

Chris Muir                <-Music   Industry ->                           Eardrill                  
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