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We present a computational model of the Hammond tonewheel organ vibrato/chorus, a musical audio effect comprising an LC ladder circuit and an electromechanical scanner. We model the LC ladder using the Wave Digital Filter (WDF) formalism, and introduce a new approach to resolving multiple nonadaptable linear elements at the root of a WDF tree. Additionally we formalize how to apply the well-known warped Bilinear Transform to WDF discretization of capacitors and inductors and review WDF polarity inverters. To model the scanner we propose a simplified and physically-informed approach. We discuss the time- and frequency-domain behavior of the model, emphasizing the spectral properties of interpolation between the taps of the LC ladder.
|Title of host publication||Proceedings of the 19th International Conference on Digital Audio Effects|
|Editors||Pavel Rajmic, František Rund, Jiří Schimmel|
|Number of pages||8|
|Publication status||Published - 05 Sep 2016|
|Event||19th International Conference on Digital Audio Effects - Brno, Czech Republic|
Duration: 05 Sep 2016 → 09 Sep 2016
|Conference||19th International Conference on Digital Audio Effects|
|Period||05/09/2016 → 09/09/2016|
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