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This paper presents a novel method for detecting cardiac abnormalities in a way which is both noninvasive and low cost. This method utilizes the presence of harmonics generated within the human heart as indicators of possible cardiac abnormalities such as cardiac blocks or cardiac valve dysfunctions. Our work is divided into two sections; firstly, the establishment of the fundamental frequency of the human heart along with its associated sub-harmonics and secondly, the presence of various harmonics in normal and abnormal cardiac signals which may serve as possible indicators to determine cardiac dysfunctions. Our method was applied on Phonocardiograph (PCG) signals of patients with various cardiac conditions.

Establishing the presence of Cardiac Sub-Harmonics and its Importance in detecting Cardiac Abnormalities