Techniques for detecting heart pulses and reducing power...

A - Human Necessities – 61 – B

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A61B 5/00 (2006.01) A61B 5/024 (2006.01)

Patent

CA 2556724

Low power techniques for sensing cardiac pulses in a signal from a sensor (101) are provided. A pulse detection block (102) senses the sensor signal and determines its signal-to-noise ratio. After comparing the signal-to-noise ratio to a threshold, the drive current of light emitting elements in the sensor is dynamically adjusted to reduce power consumption while maintaining the signal-to-noise ratio at an adequate level. The signal component of the sensor signal can be measured by identifying systolic transitions. The systolic transitions are detected using a maximum and minimum derivative averaging scheme. The moving minimum (301) and the moving maximum (304) are compared to the scaled sum (312, 313) of the moving minimum and moving maximum to identify the systolic transitions. Once the signal component has been identified, the signal component is compared to a noise component to calculate the signal-to-noise ratio.

L'invention concerne des techniques de basse puissance permettant la détection de pulsations cardiaques dans un signal provenant d'un capteur (101). Un bloc (102) de détection de pulsations détecte le signal du capteur et il détermine son rapport signal/bruit. Après comparaison du rapport signal/bruit avec un seuil, le courant d'attaque des éléments photoémetteurs dans le capteur est ajusté de façon dynamique pour réduire la consommation d'énergie tout en maintenant le rapport signal/bruit à un niveau adéquat. La composante de signal du signal du capteur peut être mesurée par identification de transitions systoliques. Les transitions systoliques sont détectées à l'aide d'un mécanisme de calcul de moyenne de dérivée maximum et minimum. Le minimum mobile (301) et le maximum mobile (304) sont comparés à la somme (312, 313) mise à l'échelle du minimum mobile et du maximum mobile pour identifier les transitions systoliques. Une fois la composante de signal identifiée, la composante de signal est comparée à une composante de bruit pour calculer le rapport signal/bruit.

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