A Computational model of the Hammond Organ Vibrato/Chorus Using Wave Digital Filters

Kurt James Werner, W. Ross Dunkel, François G. Germain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)
339 Downloads (Pure)

Abstract

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.
Original languageEnglish
Title of host publicationProceedings of the 19th International Conference on Digital Audio Effects
EditorsPavel Rajmic, František Rund, Jiří Schimmel
PublisherDAFx
Pages271–278
Number of pages8
Publication statusPublished - 05 Sep 2016
Externally publishedYes
Event19th International Conference on Digital Audio Effects - Brno, Czech Republic
Duration: 05 Sep 201609 Sep 2016

Conference

Conference19th International Conference on Digital Audio Effects
Abbreviated titleDAFx-16
CountryCzech Republic
CityBrno
Period05/09/201609/09/2016

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