Low power techniques for sensing cardiac pulses in a signal from a sensor are provided. A pulse detection block 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...http://www.google.de/patents/US7499740?utm_source=gb-gplus-sharePatent US7499740 - Techniques for detecting heart pulses and reducing power consumption in sensors
