Nonlinear noise reduction for magnetocardiograms using...

A - Human Necessities – 61 – B

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A61B 5/0402 (2006.01) A61B 5/04 (2006.01) A61B 5/0452 (2006.01) G06T 5/00 (2006.01) G06T 5/10 (2006.01)

Patent

CA 2458176

A two-part method for reducing the noise contribution in a composite signal using the wavelet transform is described. The procedure involves the identification of subspaces in the reconstructed state space created by dynamical processes ( either by deterministic noise or the signal itself), the separation of different subspaces and the separation of subspaces from stochastic noise. The method is used for non-linear de-noising (NLD) of magnetocardiograph or electrocardiograph time series signals by performing local projections in the reconstructed state space using the wavelet transform to identify and describe deterministic structures. Subspaces generated by any deterministic process are located and separated independently of its source.

L'invention concerne un procédé en deux parties destiné à réduire l'apport de bruit dans un signal composite par transformation en ondelettes. Ledit procédé consiste à identifier des sous-espaces dans l'espace d'état reconstruit créé par des processus dynamiques (soit par bruit déterministe, soit par le signal lui-même), la séparation des différents sous-espaces et la séparation des sous-espaces de bruit stochastique. Ledit procédé est utilisé dans l'atténuation du bruit non linéaire (NLD) de signaux chronologiques magnétocardiographiques ou électrocardiographiques grâce à l'exécution de projections locales dans l'espace d'état reconstruit par transformation d'ondelettes pour identifier et décrire des structures déterministes. Des sous-espaces générés par un processus déterministe sont situés et séparés indépendamment de sa source.

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