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Additive Synthesis by Subtractive Resonant Filters
Juan Reyes (juanig@ccrma.stanford.edu)
Center for Computer
Research in Music and Acoustics(CCRMA)
Department of Music, Stanford
University
Stanford, California 94305
Abstract:
Resonant filters can be fine tuned to a very narrow frequency band
thereby isolating a tone even from a non-pitched sound
source. ``Maxf.ins'' is Max Mathews (mvm) new filter (2002)
described as a High-Q, 2-Integrator, filter with two poles, and one
zero at the origin. This CLM implementation renders equal tempered
frequencies integer & just scales out of a wide-band input
signal. The filter might be used for Modal Synthesis but also might
be Additive Synthesis in which a resonator is initialized to
generate the exponentially decaying sinusoids at the desired
phase. Different states which are bound in parallel are defined in a
structure which contains different frequencies and tunings for
resonant modes. In this algorithm the filter is recurrent over the
source signal by iterating the number of desired frequencies in a
state. States can be defined as containing at least one frequency up
to the CPU processing power. We have tested as many as sixteen
states.
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© Copyright 2003 CCRMA, Stanford University. All rights reserved.
Created and Mantained by Juan Reyes