A Learning Filter for Removing Noise Interference
Gregory S. Furno, Willis J. Tompkins · IEEE Transactions on Biomedical Engineering · 1983
We have developed a microcomputer-based filter that removes line induced electrical interference from biopotential signals by learning one period of the noise waveform and subtracting it from the signal. Since it uses a noise template, the filter can remove noise waveforms containing several harmonics of the 60 Hz line frequency.