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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;
    Academic Unit: Faculty of Arts,Celtic Studies and Philosophy > Music
    Faculty of Science and Engineering > Computer Science
    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
    Funders: An Foras Feasa, SAME Project (7th Framework Programme), Academy of Finland
    URI:

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