Virtual analog models of the Lockhart and Serge wavefolders

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number1328
JournalApplied Sciences (Switzerland)
Volume7
Issue number12
StatePublished - 20 Dec 2017
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • Native Instruments GmbH
  • University of Edinburgh

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.

    Research areas

  • Acoustic signal processing, Antialiasing, Circuit modeling, Music, Nonlinear waveshaping, Synthesis

Download statistics

No data available

ID: 16820113