A combined method to reduce motion artifact and power line interference for wearable healthcare systems

A combined method to reduce motion artifact (MA) and power line interference (PLI) for wearable healthcare system is introduced. The proposed method has a block for the reduction of MA using measured electrode-skin impedance as a reference signal and a block for the cancellation of PLI using mixed-signal feedback to relax the dynamic range requirements of components in the forward path. The measured electrode-skin impedance is used as a reference signal of an adaptive filter for reducing MA. The 60Hz notch frequency which has the same amplitude as PLI's is made digitally and uses feedback to the input stage to reduce PLI. This method was simulated using MATLAB/Simulink for high-level verification of the method's validity.

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