Wavelet Transform Based Abnormality Analysis of Heart Sound

This paper is concerned with the analysis of the first (S1) and second (S2) heart sound of the Phonocardiogram signal (PCG) using Discrete Wavelet Transform (DWT) and Continuous Wavelet Transform (CWT). The second heart sound S2 consists of two major components A2 and P2. The time delay between them plays very vital role in medical diagnosis. DWT is used for denoising and finding the best split of A2 and P2 components of S2, where as, CWT is used to determine the number of frequency components of S1 and S2. Experiments are performed on normal and pathological PCG signals. Denoising and finding split between A2 and P2 is carried out using DWT. The frequency components of S1 and S2 of PCG are determined using CWT. Also split between A2 and P2 have been measured using CWT.