The Heart sounds and murmurs provide crucial diagnosis information for several heart diseases such as natural or prosthetic valve dysfunction and heart failure. Many pathological conditions of the cardiovascular system cause murmurs and aberrations in heart sounds. Phonocardiography provides the clinician with a complementary tool to record the heart sounds heard during auscultation. The advanc...

In this paper, we propose a robust classification method for lung sounds contaminated with heart sounds in order to distinguish between healthy subjects and abnormal patients with pulmonary emphysema. We previously developed a classification procedure based on a maximum-likelihood approach by using hidden Markov models (HMMs). However, contaminated heart sounds caused difficulties in achieving ...

© 2015 ETRI Journal, Volume 37, Number 4, August 2015 http://dx.doi.org/10.4218/etrij.15.0114.1447 Heart sounds are the main obstacle in lung sound analysis. To tackle this obstacle, we propose a diagnosis algorithm that uses singular spectrum analysis (SSA) and frequency features of heart and lung sounds. In particular, we introduce a frequency coefficient that shows the frequency difference b...

Introduction: To realize noninvasive diagnosis and early diagnosis of coronary heart disease, the study proposes a new time-frequency method for analyzing heart sound signals. This method is based on Choi-Williams Distribution (CWD). Methods: CWD distribution is developed and modified from Wigner Ville distribution (WVD). To solve the problem of cross-term interference existing in WVD there is ...