title: [Heart sound measurement and analysis system with a stethoscope].
abstract: This paper is composed with the cardiac sound measurement and analysis system for in-home use of heart abnormality monitoring. The heart sound acquiring system is composed of a traditional chest-piece, earphone, microphone, and IC recorder. The recorded data is transmitted to a computer by USB interface for analysis based on the cardiac sound characteristic waveform (CSCW) method, which is extracted from an analytical model of single degree-of-freedom (SDOF). Furthermore, the characteristic parameters [T1, T2, T11, T12] are defined by the time intervals between the crossed points of the CSCW and a threshold value (THV), which are related to the first sound and the second sound and are used for discriminating normal and abnormal heart sounds. Also, an easy-understanding graphical representation for these parameters is considered, so that, even for an inexperienced user, he or she is able to monitor his or her cardiac status easily. Finally, a case study on the abnormal/normal cardiac sounds is demonstrated to validate the usefulness and efficiency of this proposed system and the cardiac sound characteristic waveform method.
authors.affiliation: School of Electrical and Information Engineering, Xihua University, Chengdu 610039, China. ddwang.kr987@yahoo.com.cn
authors.forename: Haibin
authors.initials: H
authors.lastname: Wang
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Jiang
authors.forename: Xiucheng
authors.initials: X
authors.lastname: Dong
authors.forename: Samjin
authors.initials: S
authors.lastname: Choi
authors.forename: Junqi
authors.initials: J
authors.lastname: Zhang
authors.forename: Shuping
authors.initials: S
authors.lastname: Sun
mesh_terms: D000465:Algorithms; D006326:Heart Auscultation; D006347:Heart Sounds / Q000502:physiology*; D006801:Humans; D012815:Signal Processing, Computer-Assisted; D012985:Software Design; D019023:Stethoscopes