Projects:2014S1-19 Analysis Of Heart Sound Signals using the Wavelet Transform

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Project Information

Project Introduction

Auscultation with a stethoscope is one of the most important tools in diagnosing the heart diseases. However diagnosing the heart sounds through auscultation is subjective since it depends largely on hearing ability and skill of physicians. Thus, our research is to develop a standard heart sounds diagnosing fools which is able to recognize the characteristic of the heart sounds and able to classify the heart sounds automatically.

modelling of heart sound

Heart sounds provides information about people's physical conditions. The first heart sounds (S1) occurs at the beginning of ventricular contraction during the closure of the mitral and tricuspid valves. It indicates the beginning of ventricular systole. The second heart sound (S2)marks the end of ventricular systole and the begining of ventricular relaxation, following the closure of the aortic and the pulmonary valves. The identification of systole and diastoel is important in determing other heart sound and murmurs. Heart murmurs also may be present in the phonocardiogram (PCG), are generally assocated with abnormal function of the cardiac valve, except for the innocent murmurs which may occur during systole in young people with normal hearts. The murmur can be classified as systolic murmurs and diastolic murmurs according to theri production phase.

different methods


As the PCG signals are complex signals that are very difficult to analyze visually, they can be transformed to frequency domain to analyze.