Modeling and measuring a Moog voltage-controlled filter

Effrosyni Paschou, Fabian Esqueda Flores, Vesa Välimäki, John Mourjopoulos

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

6 Citations (Scopus)
291 Downloads (Pure)


The analog voltage-controlled filter used in historical music synthesizers by Moog is modeled using a digital system, which is then compared in terms of audio measurements with the original analog filter. The analog model is mainly borrowed from D’Angelo’s previous work. The digital implementation of the filter incorporates a recently proposed antialiasing method. This method enhances the clarity of output signals in the case of large-level input signals, which cause harmonic distortion. The combination of these two ideas leads to a novel digital model, which represents the state of the art in virtual analog musical filters. It is shown that without the antialiasing, the output signals
in the nonlinear regime may be contaminated by undesirable spectral components, which are the consequence of aliasing, but that the antialiasing technique suppresses these components sufficiently. Comparison of measurements of the analog and digital filters show that the digital model is accurate within a few dB in the linear regime and has very similar behavior in
the nonlinear regime in terms of distortion. The proposed digital filter model can be used as a building block in virtual analog music synthesizers.
Original languageEnglish
Title of host publicationProceedings of the Ninth Annual Conference of the Asia-Pacific Signal and Information Processing Association
Place of PublicationKuala Lumpur
Pages1641 - 1647
Number of pages7
ISBN (Electronic)978-1-5386-1542-3
Publication statusPublished - 2017
MoE publication typeA4 Conference publication
EventAsia-Pacific Signal and Information Processing Association Annual Summit and Conference - Aloft Kuala Lumpur Sentral, Kuala Lumpur, Malaysia
Duration: 12 Dec 201715 Dec 2017
Conference number: 9


ConferenceAsia-Pacific Signal and Information Processing Association Annual Summit and Conference
Abbreviated titleAPSIPA
CityKuala Lumpur
Internet address


  • Audio systems
  • music technology


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