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  • Research Article
  • Open Access

Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform

  • 1Email author,
  • 2,
  • 2,
  • 1 and
  • 1
EURASIP Journal on Advances in Signal Processing20112011:785103

https://doi.org/10.1155/2011/785103

  • Received: 13 October 2010
  • Accepted: 25 February 2011
  • Published:

Abstract

Discrete-time modelling strategies of analogue Moog sawtooth oscillator waveforms are presented. Two alternative approaches suitable for real-time implementation are proposed, one modelling the analogue waveform in time domain using phase distortion synthesis and another matching the spectrum of an existing antialiasing sawtooth oscillator to the corresponding analogue spectrum using a first-order IIR post-equalising filter. A parameter estimation procedure for both approaches is explained and performed. Performance evaluation using polynomial fits for the estimated parameters is carried out, and good matches between the model outputs and recorded waveforms are obtained. The best match of the tested algorithms is produced by the phase distortion model and by post-equalising the fourth-order B-spline bandlimited step function sawtooth oscillator.

Keywords

  • Performance Evaluation
  • Model Output
  • Quantum Information
  • Estimation Procedure
  • Good Match

Publisher note

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Authors’ Affiliations

(1)
Department of Signal Processing and Acoustics, Aalto University School of Electrical Engineering, P.O. Box 13000, 00076 Aalto, Finland
(2)
Digital Sound and Music Technology Group, National University of Ireland, Maynooth, Co. Kildare, Ireland

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