Frequency estimation of electro-islet-graphy

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 5/04 (2006.01)

Patent

CA 2332799

The fundamental frequency of EIG events is determined directly, without first detecting the events themselves. Use is made of an analysis window containing more than one event (3-5). Techniques (1-8) are utilized which are somewhat similar to those utilized to detect, and estimate pitch in speech processing. The invention is based on two important biological discoveries. The first is that the EIG is generated by a functional pace maker. The second is that the EIG signal is quasi-periodic most of the time. The use of pitch detection algorithms is based on the essentially quasi-periodic nature of the EIG signal. Quasi-periodic means that the intervals between successive events are not exactly identical, but may vary slightly, that the amplitude and shape of successive events may also exhibit some variance.

Il est possible de déterminer directement la fréquence fondamentale d'événements d'électro-insulo-graphie (EIG) sans avoir préalablement détecté les événements eux-mêmes. On utilise à cet effet une fenêtre d'analyse contenant plus d'un événement (3-5), et des techniques (1-8) assez voisines de celles servant à détecter et estimer la hauteur d'un son dans le traitement de la voix. L'invention se base sur deux découvertes biologiques importantes. La première est que l'EIG est produit par un pacemaker fonctionnel, et la deuxième est que le signal d'EIG est presque toujours quasi-périodique, l'utilisation d'algorithmes de détection de hauteur de sons reposant sur la nature essentiellement quasi-périodique du signal EIG. Quasi-périodique signifie que les intervalles entre deux événements successifs ne sont pas exactement identiques mais peuvent varier légèrement, et que l'amplitude et la forme d'événements successifs peuvent également présenter certaines différences.

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