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The paper deals with some aspects of the subtraction procedure applied for powerline interference removing from high sampling rated ECG signals. Here high sampling rated ECG signal stands for signal with sampling rate-to-mains frequency ratio of about 15. Appropriate changes in the main stages of the subtraction procedure are introduced to ensure effective power-line interference removal. An adequate methodology is proposed to compensate the frequency deviation of the mains frequency. Besides, a specifically developed algorithm accelerates the initial procedure adaptation, as well as its work in case of abrupt changes of the mains frequency. Finally, program implementation of the modified subtraction procedure is elaborated and the results of simulated tests with 16 kHz sampling rated ECG signals are presented.

Subtraction Procedure for Power-line Interference Removal from ECG signals with High Sampling Rate