Virtual Analog Models of the Lockhart and Serge Wavefolders†
AbstractWavefolders 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. View Full-Text
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Esqueda, F.; Pöntynen, H.; Parker, J.D.; Bilbao, S. Virtual Analog Models of the Lockhart and Serge Wavefolders. Appl. Sci. 2017, 7, 1328.
Esqueda F, Pöntynen H, Parker JD, Bilbao S. Virtual Analog Models of the Lockhart and Serge Wavefolders. Applied Sciences. 2017; 7(12):1328.Chicago/Turabian Style
Esqueda, Fabián; Pöntynen, Henri; Parker, Julian D.; Bilbao, Stefan. 2017. "Virtual Analog Models of the Lockhart and Serge Wavefolders." Appl. Sci. 7, no. 12: 1328.
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