ECG Signal Enhancement Using Wavelet Transform


Electrocardiogram (ECG) signal has been widely used in cardiac pathology to detect heart disease. The ongoing trend of ECG monitoring techniques to become more ambulatory and less obtrusive generally comes at the expense of decreased signal quality. To enhance this quality, consecutive ECG complexes can be averaged triggered on the heartbeat, exploiting the quasi-periodicity of the ECG. However, this averaging constitutes a trade-off between improvement of the SNR and loss of clinically relevant physiological signal dynamics. Recent work has attempted to utilize wavelet techniques in the analysis of biomedical signals including ECG. In this paper Multi-Resolution Analysis property of wavelet transform is used to enhance ECG signal quality by denoising the signal using Daubechies 6 Wavelet as best suited mother wavelet at level 4.

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