Unsupervised classification of the spectrogram zeros with an application to signal detection and denoising

Juan Miramont (1) , François Auger (1) , Marcelo Colominas (2) , Nils Laurent (3) , Sylvain Meignen (4)

1 IREENA - Institut de Recherche en Energie Electrique de Nantes Atlantique UR 4642
2 CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]
3 LJK - Laboratoire Jean Kuntzmann
4 DAO - Données, Apprentissage et Optimisation

Spectrogram zeros, originated by the destructive interference between the components of a signal in the time-frequency plane, have proven to be a relevant feature to describe the time-varying frequency structure of a signal. In this work, we first introduce a classification of the spectrogram zeros in three classes that depend on the nature of the components that interfere to produce them. Then, we describe an algorithm to classify these points in an unsupervised way, based on the analysis of the stability of their location with respect to additive noise. Finally, potential uses of the classification of zeros of the spectrogram for signal detection and denoising are investigated, and compared with other methods on both synthetic and real-world signals.

Mots clés: Zeros of the spectrogram; time-frequency analysis; non-stationary signals; noise-assisted methods

Domaines: Traitement du signal et de l'image [eess.SP]

Juan Miramont, François Auger, Marcelo Colominas, Nils Laurent, Sylvain Meignen. Unsupervised classification of the spectrogram zeros with an application to signal detection and denoising. Signal Processing, 2024, 214, pp.109250. ⟨10.1016/j.sigpro.2023.109250⟩. ⟨hal-04206147⟩