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Virtual analog models of the Lockhart and Serge wavefolders
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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Applied Sciences, Volume 7, issue 12
Abstract
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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Esqueda, F, Pöntynen, H, Parker, J D & Bilbao, S 2017, 'Virtual analog models of the Lockhart and Serge wavefolders', Applied Sciences, vol. 7, no. 12, 1328. https://doi.org/10.3390/app7121328