Filtros analógicos ativos para sinais ECG.

Abstract

In this work, a low-cost processing system for electrocardiogram signals was developed from an active analog filter module. This system allows to attenuate interferences that modify the electrical signal from the human heart, enabling health professionals to perform a more accurate analysis, diagnosis and monitoring of the patients’ condition. Therefore, the expressions defining the electric filters were developed, along with the analysis of the behavior for each approximation model. The filters were simulated in order to verify their frequency responses and considering their respective schematics. It came into conclusion that, for the attenuation of the interference of the electrical power, the low-pass filter that was developed did not have the expected attenuation, consequently, it was necessary to develop the notch filter.