POWERLINE INTERFERENCE REMOVAL TECHNIQUE USING DIGITAL NOTCH FILTER IN ECG

ECG signal analysis plays a vital role in the diagnosis of heart abnormities. The presence of noise can change the primitive characteristics of the ECG signal. The ECG signal gets affected by the powerline interference noise (PLI) during the time of signal acquisition. In this paper, digital quality factor (Q) varying notch IIR filter with a zero-phase filtering technique is proposed to remove the power line interference in the ECG signal. The correlation factor is estimated for its validation between the filtered ECG and raw ECG signal. The quality factor of digital IIR notch filter is tuned to achieve a better correlation coefficient and signal to noise ratio (SNR) of filtered ECG signal. The highest correlation factor unity is achieved at the quality factor of 1. The proposed technique is also tested and validated on the MIT-BIH database.