Une ou deux composantes ? La réponse de la diffusion en ondelettes

05/21/2019

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by   Vincent Lostanlen, et al.

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With the aim of constructing a biologically plausible model of machine listening, we study the representation of a multicomponent stationary signal by a wavelet scattering network. First, we show that renormalizing second-order nodes by their first-order parents gives a simple numerical criterion to establish whether two neighboring components will interfere psychoacoustically. Secondly, we generalize the `one or two components' framework to three sine waves or more, and show that a network of depth M = _2 N suffices to characterize the relative amplitudes of the first N terms in a Fourier series, while enjoying properties of invariance to frequency transposition and component-wise phase shifts.