It is rarely possible to obtain recordings of lung sounds that are 100% free of contaminating sounds from nonrespiratory sources, such as the heart. Depending on pulmonary airflow, sensor location, and individual physiology, heart sounds may obscure lung sounds in both time and frequency domains, and thus pose a challenge for development of semi-automated diagnostic techniques. In this study, r...

The amplitude and intensity of heart sounds were measured at the chest wall in 25 patients with acute myocardial infarction in order to determine what meaningfUl clinical information can be derived from observing the intensity of the heart sounds. During the early period after infarction, the first heart sound (Si), the aortic component of the second heart sound (A2), and the pulmonary componen...

This paper is concerned with a synthesis study of the fast Fourier transform (FFT), the short-time Fourier transform (STFT), the Wigner distribution (WD) and the wavelet transform (WT) in analysing the phonocardiogram signal (PCG). It is shown that these transforms provide enough features of the PCG signals that will help clinics to obtain qualitative and quantitative measurements of the time-f...

In this little pocket-book of 60 Pa.^?' a_ student will find a good deal of usefu tiou put simply and clearly. The text is illustrated with diagrams, showing the characteristics of the murmurs as to time, length and roughness. The book may easily be used for clinical reference and should prove of value to the beginners in acquiring the elements of cardiac ascultation. Many valuable hints are in...

This paper presents design of system for access control using heart sound biometric signature based on energy percentage in each wavelet coefficients and MFCC feature. A collection of 40 heart sounds records for different persons from internet, for each recording signatures were calculated during two heart cycles after denoising of each recording. A Euclidean distance is used as classification ...

Heart sounds and murmurs provide crucial diagnosis information for several heart diseases such as natural or prosthetic valve dysfunction and heart failure, which need to isolate the cardiac pathologies whether murmurs or superimposed sounds to the heart sounds in order to better appreciate their durations to can be processed more easily. This paper presents an algorithm for the detection of he...

Compared to information available on the third and fourth heart sounds in the horse [1] there is a paucity of information on these sounds in cattle in the veterinary literature, although auscultation is the main step in clinical examination of both the cardiovascular system and the animal as a whole. Most literatures describe bovine cardiac sounds and mention that all four heart sounds may be h...

Heart auscultation (the interpretation by a physician of heart sounds) is a fundamental component of cardiac diagnosis. It is, however, a difficult skill to acquire. In this work, we develop a simple model for the production of heart sounds, and demonstrate its utility in identifying features useful in diagnosis. We then present a prototype system intended to aid in heart sound analysis. Based ...