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Nonlinear filtering in ECG signal enhancement

In this paper various non linear, non adaptive filtering techniques are presented for the removal of baseline wander removal from ECG signals. The performance characteristics of various filtering techniques are measured in terms of signal to noise ratio. | ISSN:2249-5789 N Siddiah et al, International Journal of Computer Science & Communication Networks,Vol 2(1), 134-139 Nonlinear filtering in ECG Signal Enhancement N. Siddiah1, T.Srikanth2 and Y. Satish Kumar3 1 Abstract Dept. of E.C.E., Mekapati Raja Mohana Reddy Institute of Technology & Science, Udyagiri, A.P., India. 2 Dept. of E.C.E., Kallam Haranadha Reddy Institute of Technology, Guntur, A.P., India. 3 Dept. of E.C.E., Chalapathi Institute of Technology, Guntur, A.P., India. E-Mail: siddun89@ymail.com - High resolution ECG signals are needed in measuring cardiac abnormalities analysis. Generally baseline wander is one of the important artifact occurred in ECG signal extraction, this strongly affects the signal quality. In order to facilitate proper diagnosis these artifacts have to be removed. In this paper various non linear, non adaptive filtering techniques are presented for the removal of baseline wander removal from ECG signals. The performance characteristics of various filtering techniques are measured in terms of signal to noise ratio. Keywords - artifacts, baseline wander, ECG signal, filtering. 1. INTRODUCTION Various civilizations have used arterial pulses as a guide for the diagnosis of diseases. All methods of pulse diagnosis requires that professionals have training and experience, however, even the diagnosis of experienced professionals is not always accurate. Pulse analysis waveform is used for a variety of pathological and physiological purposes in diagnosis. In recent years computer aided ECG signal analysis has gained momentum and a tremendous amount of work has been carried out [1]-[5]. One area of interest has been removing artifacts from data records. Artifacts are the noise induced to ECG signals that result from movements of electrodes. This in turn causes deformation and change in the electrical characteristics of the skin under and around the electrodes. These electrical changes appear in the ECG as motion artifacts and .