Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform

Pekonen, Jussi and Lazzarini, Victor and Timoney, Joseph and Kleimola, Jari and Valimaki, Vesa (2011) Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform. EURASIP Journal on Advances in Signal Processing (785103). ISSN 1687-6172

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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.

Item Type: Article
Keywords: Discrete-Time Modelling; Moog Sawtooth Oscillator Waveform;
Academic Unit: Faculty of Arts,Celtic Studies and Philosophy > Music
Faculty of Science and Engineering > Computer Science
Item ID: 4185
Depositing User: Dr Victor Lazzarini
Date Deposited: 04 Feb 2013 14:48
Journal or Publication Title: EURASIP Journal on Advances in Signal Processing
Publisher: Hindawi Publishing Corporation
Refereed: Yes

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