Instantaneous frequency and wave shape functions (I)

Details Instantaneous frequency and wave shape functions (I) Instantaneous frequency and wave shape functions (I)

2011-04-13

arxiv.org/abs/1104.2365v1

Mathematics

Numerical Analysis

17 pages, 12 figures

Scientific paper

Although one can formulate an intuitive notion of instantaneous frequency, generalizing "frequency" as we understand it in e.g. the Fourier transform, a rigorous mathematical definition is lacking. In this paper, we consider a class of functions composed of waveforms that repeat nearly periodically, and for which the instantaneous frequency can be given a rigorous meaning. We shown that Synchrosqueezing can be used to determine the instantaneous frequency of functions in this class, even if the waveform is not harmonic, thus generalizing earlier results for cosine wave functions. We also provide real-life examples and discuss the advantages, for these examples, of considering such non-harmonic waveforms.

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