Timbre Morphing of Synthesised Transients Using the Wigner Time-Frequency Distribution

Thomas Lysaght
David Vernon

Department of Computer Science
National Univeristy of Ireland, Maynooth
Co. Kildare, Ireland


In this paper we develop signal-processing techniques for Timbre Morphing consisting of linear interpolation and non-linear warping. We use the Wigner Time-Frequency Distribution as our representation of timbre. We use a simple mathematical formula for extrema to identify features in each Wigner Distrubution sufrace. Subgraph isomorphism is proposed as a method of identifying corresponding features in each sound. Signals are synthesised from Wigner Distributions using additive synthesis. We apply timbre morphing to short duration synthesised transients of equal pitch.

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