device for monitoring the heart rate based on the ekgsignale

摘要

A convenient, low cost, heart rate monitor. In one embodiment, a digital filter structure (64) includes a low pass filter having a notch at 60Hz and a bandpass filter which amplifies signals in a frequency range from 10Hz to 40Hz and has a notch at 60Hz. This digital filter has a recursive structure and uses integer coefficients to simplify and speed up the calculations. A four bit microcontroller (70) may implement the digital filter. The output of the digital filter is subject to enchancement signal processing to emphasise QRS complexes indicative of human heartbeats. The monitor further performs a plausibility check for pulse arrival times and amplitude. IMAGE