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Wavefolders are a particular class of nonlinear waveshaping circuits, and a staple of the “West Coast” tradition of analog sound synthesis. In this paper, we present analyses of two popular wavefolding circuits—the Lockhart and Serge wavefolders—and show that they achieve a very similar audio effect. We digitally model the input–output relationship of both circuits using the Lambert-W function, and examine their time- and frequency-domain behavior. To ameliorate the issue of aliasing distortion introduced by the nonlinear nature of wavefolding, we propose the use of the first-order antiderivative method. This method allows us to implement the proposed digital models in real-time without having to resort to high oversampling factors. The practical synthesis usage of both circuits is discussed by considering the case of multiple wavefolder stages arranged in series.
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- 1 Finished
1/01/12 → 31/12/16
- 1 Conference contribution
Esqueda, F., Poyntinen, H., Parker, J. & Bilbao, S., 7 Jul 2017, Proceedings of the 14th Sound and Music Computing Conference. Aalto University, 5 p.
Research output: Chapter in Book/Report/Conference proceeding › Conference contributionOpen AccessFile