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Five Variations on a Feedback Theme

Lazzarini, Victor and Timoney, Joseph and Kleimola, Jari and Välimäki, Vesa (2009) Five Variations on a Feedback Theme. DAFx 09 proceedings of the 12th International Conference on Digital Audio Effects, Politecnico di Milano, Como Campus, Sept. 1 - 4, Como, Italy. pp. 1-7.

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Abstract

This is a study on a set of feedback amplitude modulation oscillator equations. It is based on a very simple and inexpensive algorithm which is capable of generating a complex spectrum from a sinusoidal input. We examine the original and five variations on it, discussing the details of each synthesis method. These include the addition of extra delay terms, waveshaping of the feedback signal, further heterodyning and increasing the loop delay. In complement, we provide a software implementation of these algorithms as a practical example of their application and as demonstration of their potential for synthesis instrument design.

Item Type: Article
Additional Information: The work of V. Lazzarini was supported by a grant from An Foras Feasa. J. Kleimola’s contribution was supported by the EU as part of the 7th Framework Programme with the SAME project (ref. 215749). V. Välimäki’s contribution was financed by the Academy of Finland (project no. 126310).
Keywords: Feedback Theme; feedback amplitude; modulation oscillator; sinusoidal input; synthesis instrument design;
Subjects: Science & Engineering > Computer Science
Arts, Celtic Studies & Philosophy > Music
Item ID: 2333
Depositing User: Dr Victor Lazzarini
Date Deposited: 12 Jan 2011 16:14
Journal or Publication Title: DAFx 09 proceedings of the 12th International Conference on Digital Audio Effects, Politecnico di Milano, Como Campus, Sept. 1 - 4, Como, Italy
Publisher: Dept. of Electronic Engineering, Queen Mary Univ. of London,
Refereed: Yes
URI:

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