基于循环平稳特性消除肺部声音记录中的心音。

Heart sound cancellation from lung sound record using cyclostationarity.

机构信息

Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, 116024, China; College of Information and Communication Engineering, Dalian Nationalities University, 116600, China.

出版信息

Med Eng Phys. 2013 Dec;35(12):1831-6. doi: 10.1016/j.medengphy.2013.05.004. Epub 2013 Jun 10.

DOI:10.1016/j.medengphy.2013.05.004

PMID:23764431

Abstract

From the mechanism of heart sound generation, it is known that heart sounds are cyclic following the frequency of the heartbeat. This paper proposes a short-time cyclic frequency spectrum to calculate the instantaneous cycle frequency (ICF) of heart sounds as an estimation of the frequency of the heartbeat. Heart sounds in a lung sound record are detected with the assistance of ICF. Lung sounds (LSs) are recovered by removing heart sounds from the LS record. An LS record is the only input signal source; no other reference signal is necessary. Evaluation by visual inspection, auditory listening and spectral analysis all show that heart sounds are successfully cancelled without hampering the main components of lung sounds.

摘要

从心音产生的机制可知，心音是随心跳频率周期性出现的。本文提出了一种短时循环频谱来计算心音的瞬时循环频率（ICF），作为心跳频率的估计值。借助 ICF 在心音记录中检测心音。从 LS 记录中去除心音以恢复 LS。LS 记录是唯一的输入信号源；不需要其他参考信号。通过视觉检查、听觉监听和频谱分析进行的评估都表明，成功地消除了心音，而不会对主要的 LS 成分造成干扰。