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Victor Lazzarini
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Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2021) 45 (2): 67–83.
Published: 01 June 2021
FIGURES
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A common approach in the development of digital filters is to begin with an existing analog filter and produce an equivalent computer program to realize it. This may involve, at the extreme, the detailed analysis of circuit behavior, or it may stem from a higher-level approach that looks at block diagrams and s -domain transfer functions. In this article, we first take the latter approach to develop a set of linear filters from the well-known state variable filter. From this we obtain a first result, which is a linear digital implementation of the Steiner design, comprising separate inputs for different frequency responses and a single output summing the responses. Turning back to the state variable design, we show that to develop a nonlinear version, an analog circuit realization can be used to identify positions in which to insert nonlinear waveshapers. This gives us our second result, a nonlinear digital state variable filter. From this analog-derived design, we then propose modifications that go beyond the original filter, developing as a final result a structure that could be classed as a hybrid of filter and digital waveshaper. As part of this process, we ask the question of whether an approach that takes inspiration from the analog world, while being decoupled from it, may be more profitable in the long run than an obsession with detailed circuit modeling.
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2020) 44 (1): 6–16.
Published: 05 April 2020
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2013) 37 (1): 35–43.
Published: 01 March 2013
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This article explores techniques for synthesizing resonant sounds using the principle of nonlinear distortion. These methods can be grouped under the heading of “subtractive synthesis without filters,” the case for which has been made in the literature. Starting with a simple resonator model, this article looks at how the source-modifier arrangement can be reconstructed as a heterodyne structure made of a sinusoidal carrier and a complex modulator. From this, we examine how the modulator signal can be created with nonlinear distortion methods, looking at the classic case of phase-aligned formant synthesis and then our own modified frequency-modulation technique. The article concludes with some application examples of this sound-synthesis principle.
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2010) 34 (1): 28–40.
Published: 01 March 2010
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2008) 32 (2): 9–22.
Published: 01 June 2008
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2008) 32 (2): 4.
Published: 01 June 2008
Journal Articles
Publisher: Journals Gateway
Computer Music Journal (2007) 31 (4): 75–77.
Published: 01 December 2007