A hybrid method for removal of power line interference and baseline wander in ECG signals using EMD and EWT

The removal of power line interference (PLI) and baseline wander (BW) is an essential task for the analysis of the ECG signal. This paper presents a new method to suppress PLI and BW from electrocardiogram (ECG) signals using a hybrid approach of empirical mode decomposition (EMD) and empirical wavelet transform (EWT). The proposed method consists of four stages: EMD-based ECG signal decomposition, construction of high and lowfrequency sub-signals based on the ratio of the zero crossing numbers (RZCN), estimation of PLI and BW through using EWT, and the interference subtraction. The proposed method is tested and validated through experiments performed over a wide variety of real ECG signals which are available on the MIT-BIH arrhythmia database. The results show that the proposed method can effectively remove PLI and BW without distorting the ECG signal components. The efficacy of the proposed method is compared with some of the state-of-the-art methods in terms of output signal-to-noise ratio (SNRo), cross-correlation coefficient (rho), percent root mean square difference (PRD), and weighted diagnostic distortion (WDD) at a different input signal-to-noise ratio (SNRi). The qualitative and quantitative results show that the proposed method outperforms the existing methods.