Denoising and extraction of electrocardiogram signal using Ensemble Pragmatic Mode Decomposition (EPMD)

摘要

Signal processing a major tool used for ECG analysis and interpretation in today's life. In ECG signal processing is used to improve the measurement accuracy and reproducibility comparatively. Separating respiration signals from ECG is one way of obtaining knowledge related to respiration especially when specialized equipments are not used to monitor the respiration continuously. There are chances of noises added to ECG signal when it is transferred via wireless medium. Some of these noises are baseline wander, power - line interference, etc. These types of noises corrupt the ECG signal resulting in a way unable to diagnose the disease. But removing the noise can only give the exact ECG signal. Here we are using Ensemble Pragmatic Mode Decomposition technique to remove the noises with single channel ECG based on higher order statistics and also to extract the QRS peak. The EPMD technique is altered from the NLWT algorithm in few aspects: the transform domain collaborative filtering and the block-based processing. NLWT is differed from EPMD by using Single channel ECG to reconstruct the respiratory signal waveform. To achieve the goal two techniques are used for the decomposing the ECG signal into suitable bases of functions namely Hilbert-Huang Transform (HHT) Analysis and the Ensemble Pragmatic Mode Decomposition (EPMD). The frequency information evolving with time scales and time locations provides the performance of HHT and Ensemble Pragmatic Mode Decomposition by an analysis of Intrinsic Mode Function (IMF). The signal to noise ratio is increased using EPMD technique and it overcomes the drawback of NLWT method by using single channel ECG signal instead of multichannel ECG signal in NLWT method.