Approach of Successive Suppression of Mains Interference and Baseline Drift in ECG Signals

The article presents an approach for the simultaneous removal of baseline drift and mains interference from ECG signals. The approach is based on a pipelined implementation of an adaptive rejection filter for the mains frequency and a high-pass filter to remove the baseline drift. A program procedure is proposed that adapts the rejection filter to the deviation in the mains frequency. A program has been compiled that determines the parameters of the high-pass filter depending on the set cut-off frequency for the high-pass filtering. Tests conducted with artificial and real ECG signals and interferences show very good baseline drift removal and completely suppress mains interferences with minimal impact on the ECG signal shape.