Abstract :

 This line of research is about a digital implementation of the Moog filter (VCF).

The transition from analog to digital domain introduces side effects that require to be compensated using advanced DSP techniques.

Starting from the analysis of the analog circuit,  discretization techniques allow to obtain suitable algorithms that can be simulated or implemented in dedicated hardware or real-time audio software.

The current line of research has led to the creation of a VST plugin.

Download Examples:

• Filter Envelope
• Frequency Sweep
• Self Oscillation

Contacts:

Prof. Mario Salerno, Prof. Marco Re

References:

T. Stilson and J. O. Smith. 'Analyzing theMoog VCF with considerations for digital implementation'. In

Proc. Int. Computer Music Conf., Hong Kong, 1996.

Robin Schmidt. 'Resonance tuning for the digital Moog filter'

Federico Fontana. 'Preserving the structure of the Moog VCF in the digital domain'. Università di Verona
Dipartimento di Informatica.

Aki Härmä. 'Implementations of recursive filters having delay-free loops'. Helsinki University of Technology
Laboratory of Acoustics and Audio Signal Processing.

A. Huovilainen, 'Nonlinear digital implementation of the Moog ladder filter' in Proceedings of the International
Conference on Digital Audio Effects, Naples, Italy, October 2004

A.S. Sedra and K.C. Smith 'Microelectronic Circuits', 'Sixth Edition', Oxford University Press

Conference on Digital Audio Effects, Naples, Italy, October 2004