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Lazzarini, Victor and Timoney, Joseph (2024) A Digital Model for the Prologue Voltage Control Filter. Journal of the Audio Engineering Society, 72 (1/2). pp. 79-88. ISSN 1549-4950
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Abstract
The Prologue polyphonic synthesizer features a voltage control filter (VCF) employing an
original topology. This paper examines its circuit and extracts a flowchart, which yields a set
of analog filter equations. From these, the authors were able to develop a transfer function to
describe its ideal linear time-invariant form. Then a linear digital version of the filter to validate
the analysis was put forward. Noting that the filter operation within the synthesizer is fairly
nonlinear, modifications yielding a nonlinear model of the VCF are proposed. These were
compared with the outputs of the original analog filter, and it was found that they approximate
them consistently.
| Item Type: | Article |
|---|---|
| Keywords: | Digital Model; Prologue Voltage Control Filter; |
| Academic Unit: | Faculty of Arts,Celtic Studies and Philosophy > Music Faculty of Science and Engineering > Computer Science |
| Item ID: | 19875 |
| Identification Number: | 10.17743/jaes.2022.0120 |
| Depositing User: | Dr Victor Lazzarini |
| Date Deposited: | 26 May 2025 11:11 |
| Journal or Publication Title: | Journal of the Audio Engineering Society |
| Publisher: | Audio Engineering Society |
| Refereed: | Yes |
| Related URLs: | |
| Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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