Multiresolution Sinusoidal Modeling

Prior to the late 1990s, both vocoders and sinusoidal models were focused on modeling single-pitched, monophonic sound sources, such as a single saxophone note. Scott Levine showed that by going to multiresolution sinusoidal modeling (see §9.9), it becomes possible to encode general polyphonic sound sources with a single unified system [140,138,139]. ``Multiresolution'' refers to the use of a non-uniform filter bank, such as a wavelet or ``constant Q'' filter bank, in the underlying spectrum analysis. See Fig.9.16 for an example time-frequency resolution grid.

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About the Author: Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.