Vol. 1, Issue 7, Part G (2015)

Abstract
Power line interference can highly impair a biomedical recording. Notch filters have been propounded to repress power line interference. In this paper, a second order digital notch filter for the reduction of the fundamental power line interference component in electrocardiogram (ECG) recording is furnished. The digital notch filter is uniquely specified by two distinguished parameters, the notch filter frequency and 3dB rejection bandwidth. To this end, a real ECG waveform from MIT-BIH database which contains the normal and abnormal waveforms is depraved by an artificial power line interference. The filtered signal after applying digital notch filter is compared with the real ECG waveform. Results demonstrate that power line interference of ECG are eliminated effectively by using this digital notch filter. Interference deletion can be accomplished continuously and quickly even if the conditions of interference are varying with time or frequency. The results are obtained from the digital notch filter and calculated performance parameter like Means Square Error (MSE), power spectrums density and Signal to Noise Ratio (SNR) of the noisy and filtered electrocardiogram waveforms.