A class of non linear adaptive time-frequency transforms - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2023

A class of non linear adaptive time-frequency transforms

Pierre Warion
  • Fonction : Auteur
  • PersonId : 1135450

Résumé

This paper introduces a couple of new time-frequency transforms, designed to adapt their scale to specific features of the analyzed function. Such an adaptation is implemented via so-called focus functions, which control the window scale as a function of the time variable, or the frequency variable. In this respect, these transforms are non-linear, which makes the analysis more complex than usual. Under appropriate assumptions, some norm control can be obtained for both transforms in L^2(R) spaces, which extend the classical continuous frame norm control and guarantees well-definedness on L^2. Given the non-linearity of the transforms, the existence of inverse transforms is not guaranteed anymore, and is an open question. However, the results of this paper represent a first step towards a more general theory. Besides mathematical results, some elementary examples of time and frequency focus functions are provided, which can serve as staring point for concrete applications.
Fichier principal
Vignette du fichier
main.pdf (427.41 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04139580 , version 1 (23-06-2023)

Licence

Paternité

Identifiants

Citer

Pierre Warion, Bruno Torrésani. A class of non linear adaptive time-frequency transforms. 2023. ⟨hal-04139580⟩
20 Consultations
16 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More