Abstract:
Cardiac auscultation is one of the most important physical examination and a part of the first medical diagnostic procedures. In this study, the spectra of the heart beat sound to differentiate the normal and abnormal heart beat sounds of human with age groups have been examined. The sounds of the heart were captured using the stethoscope, mic of a personal computer, and then saved the recorded sounds in digital form. The heart beat sound data collected as time wave form, line spectra and PSDs of each of the sounds were plotted. The plot of line spectra and PSDs were done after the sound signals were transformed from the time domain to the frequency domain using FFT. The results of each of the plots showed that the sound signals due to the diastolic murmur and systolic murmur are different from in terms of the time waveform, the line spectrum and the PSD of the sound signal from the normal heart beat (Physiologically split). This is used to conclude that the sound signals due to diastolic murmur (mitral stenosis) and systolic murmur (mitral regurgitation) has specific line spectra as soon as the sound it has during that abnormal heart sound of human. The abnormal heart sound were obtained as being different from the normal heart beat of human
