#33 Methods for Separation of Amplitude and Frequency Modulation in Fourier Transformed Signals

This paper describes methods for the removal and/or separation of amplitude and frequency modulation of individual components within a Fourier spectrum. The first proposed method has a realtively low cost and works under assumptions about the behaviour of both the local and non-local magnitude and phase of sinusoidal components for these two forms of component non-stationarity. The second method is more expensive and re-synthesizes components either in the Fourier or time domain following a parameter estimation stage. Typical applications are the adjustment of expressive parameters in music signals and conditioning of signals prior to cross-synthesis.