Open Access

Feedback Amplitude Modulation Synthesis

  • Jari Kleimola1Email author,
  • Victor Lazzarini2,
  • Vesa Välimäki1 and
  • Joseph Timoney2
EURASIP Journal on Advances in Signal Processing20102011:434378

Received: 15 September 2010

Accepted: 20 December 2010

Published: 30 December 2010


A recently rediscovered sound synthesis method, which is based on feedback amplitude modulation (FBAM), is investigated. The FBAM system is interpreted as a periodically linear time-varying digital filter, and its stability, aliasing, and scaling properties are considered. Several novel variations of the basic system are derived and analyzed. Separation of the input and the modulation signals in FBAM structures is proposed which helps to create modular sound synthesis and digital audio effects applications. The FBAM is shown to be a powerful and versatile sound synthesis principle, which has similarities to the established distortion synthesis methods, but which is also essentially different from them.

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Authors’ Affiliations

Department of Signal Processing and Acoustics, Aalto University School of Electrical Engineering
Sound and Digital Music Technology Group, National University of Ireland, Maynooth, Co.


© Jari Kleimola et al. 2011

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.