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Heart is a source of sound, a "live instrument" of very unstable structures. A sound produced by acoustic activity of the heart contains information about health state of the heart. However, very few physicians can establish medical diagnosis just by using the technique of listening of heart sounds called auscultation. Spectral composition of acoustic heart beat signals in children without heart murmur (Normal), and with pathologic heart murmur of Ventricular Septal Defect (VSD) were comparedfatcat:lboztpwgtnbv3jcoozmauc56pq