 Modulated oscillations can be extracted using *wavelet ridge analysis*, a local best fit onto an oscillatory test function. .cite[Delprat et al. (1992), Mallat (1999), Lilly and Olhede (2010b)]


*  Modulated multivariate oscillations can be treated similarly.
.cite[Lilly and Olhede (2012a)]


*  Errors are proportional to modulation strength, and are minimized by a suitable choice of wavelet.
.cite[Lilly and Olhede (2010b), Lilly and Olhede (2012a)]

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