tailieunhanh - Báo cáo hóa học: "Research Article Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 785103 15 pages doi 2011 785103 Research Article Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform Jussi Pekonen 1 Victor Lazzarini 2 Joseph Timoney 2 Jari Kleimola 1 and Vesa Valimaki1 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 Correspondence should be addressed to Jussi Pekonen Received 13 October 2010 Revised 4 January 2011 Accepted 25 February 2011 Academic Editor Federico Fontana Copyright 2011 Jussi Pekonen et al. 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. 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. 1. Introduction Discrete-time modelling of analogue sound processing units has recently become an active research topic. In addition to the academic interest in the .

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