Denoising of ECG Signal with Different Wavelets

ECG signal gives vast information about the heart's activity. But it often gets contaminated with noises hence needed to be denoised. In this paper Discrete Wavelet Transform is used to denoise the signal. It also shows a comparison between wavelets used through the performance parameters. The Electrocardiogram (ECG) is a simple and reliable investigation method that provides a large amount of information about the heart (1). Electrocardiogram is the electrical activity of the heart. It is a graphical demonstration of the deviation of bio-potential versus time. The leads are placed on precise locations of the body of the person to record ECG either on graph paper or on monitors. The human heart contains four chambers i.e., Right Atrium, Left Atrium, Right Ventricle and Left Ventricle. The upper chambers are the two Atria's and the lower chambers are the two Ventricles. Under healthy condition the heartbeat begins at the Right Atrium called Sino Atria (SA) node and a particular group of cells send these electrical signals across the heart. This signal travels from the Atria to the Atrio Ventricular (AV) node. The AV node connects to a group of fibers in Ventricles that conducts the electrical signal and transmits the impulse to all parts of the lower chamber, the Ventricles. To ensure that the heart is functioning correctly this path of propagation must be traced accurately (2). II. ECG WAVEFORM