Systolic Murmurs Diagnosis Improvement by Feature Fusion and Decision Fusion Acoustic sound generated by the heart mechanical activity, can provide useful information about the condition of heart valves. The heart sound auscultation is the fundamental tool in the evaluation of the cardiovascular system. The advantage of this method is fast, inexpensive and noninvasive. Due to human auscultatory limitation and nonstationary characteristics of phonocardiogram signals (PCG), diagnosis based on sounds that are heard via a stethoscope is difficult skill, therefor it requires a lot of practice. This study has proposed a biomedical automatic system for classification of PCG signals, which, recorded by a digital stethoscope. In order to extract various characteristics of PCG signals, the power spectrum estimation, wavelet transform (WT) and Mel frequency Cepstrum coefficients (MFCC) have been used in feature extraction step. Features are given to four classifiers: support vector machine (SVM), knearest neighbor (kNN), multilayer perceptron (MLP) and maximum likelihood (ML). The majority voting combination rule is utilized for fusion of different classifiers. The proposed method has been examined on dataset of 90 PCG records containing healthy and three types of cardiac valve diseases (pulmonary stenosis (PS), Atrial Septal Defect (ASD) and Ventricular Septal Defect (VSD)). The experimental results demonstrate that the classifier fusion rule significantly increases the diagnostic accuracy of abnormal PCG. Our proposed method can be used for online classification of PCG in intelligent diagnosis systems.

Early Detection of Heart Valve Disease Employing Multiclass Classifier Cardiac disorder can prove to be fatal for a personxe2x80x99s life. Therefore, these disorders must be detected precisely in the preliminary stages. By the use of cardiac auscultation examination, one can examine the heart sounds. Cardiovascular auscultation is the most widely used technique to listen and analyze the cardiac sound in the form of phonocardiogram using an electronic stethoscope. Useful information can be derived from the PCG signal to derive the accurate functioning and status of the heart. Based on information derived, the heart sound signal can be classified into multiple categories. This method proposes an automatic, realtime and modified classification over previous methods to detect cardiac disorder by PCG heart sound signal and was tested over a database containing 5 categories of heart sound signal (PCG signals) which contains signals of one normal and 4 are abnormal categories. The method achieved an accuracy of 97.50 % during the classification process. Features are extracted from the phonocardiogram signal and then those signals are processed using machine learning classification techniques. The experimental observations suggest that the proposed model is efficient for classification of the multiclass heart sounds.