Method for processing cardioelectric signals and...

A - Human Necessities – 61 – B

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A61B 5/0452 (2006.01)

Patent

CA 2657833

Method for processing cardioelectric signals and corresponding device. The method enables processing previously sampled cardioelectric signals so as to filter the T wave, thereby improving the visualization of the P wave. The method comprises the following stages: [a] dyadic decomposition the signal into bands by calculating its wavelet transform up to a range of frequencies comprised in a first range of 15 to 150 Hz and preferably 20 to 100 Hz, [b] selection of significant bands with P wave [c] processing of the significant bands by modifying the wavelet coefficients using statistical parametric models, and preferably statistical parametric noise suppression models, [d] weighting the non-significant bands by multiplying them by a weighting function, and [e] reconstructing the signal. The invention also relates to a device for carrying out this method.

L'invention concerne un procédé permettant de traiter des signaux cardio électriques et un dispositif correspondant. Le procédé permet de traiter des signaux cardio électriques précédemment échantillonnés de façon à filtrer l'onde T, ce qui améliore de ce fait la visualisation de l'onde P. Le procédé comprend les étapes suivantes : [a] une décomposition dyadique du signal en bandes en calculant sa transformée en ondelettes jusqu'à une plage de fréquences comprise dans une première plage de 15 à 150 Hz et de préférence de 20 à 100 Hz, [b] la sélection de bandes significatives avec l'onde P, [c] le traitement des bandes significatives en modifiant les coefficients d'ondelettes en utilisant des modèles paramétriques statistiques et de préférence des modèles de suppression de bruit paramétriques statistiques, [d] la pondération des bandes non significatives en les multipliant par une fonction de pondération et, [e] la reconstitution du signal. L'invention concerne également un dispositif permettant d'exécuter ce procédé.

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