心电信号处理系统的设计与实现毕业论文.doc

心电信号处理系统的设计与实现 摘 要 系统的研究心电信号处理对疾病的早期预测及家庭医疗保健具有十分重要的意义，一直是生物医学工程领域的研究热点。心血管疾病是人类生命的最主要威胁之一，而心电(Electrocardiogram)，ECG信号是诊断心血管疾病的主要依据，心电信号是心脏电生理活动在体表的表现，提供了心脏功能等生理状况的有重要价值的临床医学信息，是临床心脏病诊断的基础。因此，设计心电信号处理系统具有重要意义。 本论文分析了国内外心电信号处理仪发展现状和趋势，介绍了设计过程中所涉及到的相关概念及资料。系统采用三运放组成的前置放大电路进行心电信号的初步放大，使用模拟低通和模拟高通组成的模拟带通滤波器对干扰信号加以滤除，同时使用陷波器对50Hz的工频干扰进一步滤除，得到比较纯净的心电信号，再对其实施A/D转换，通过单片机处理系统最终将检测结果用LCD显示出来。 关键词: 心电信号，虚拟仪器 ECGSIGNALPROCESSINGSYSTEM The research of portable ECG manager, which has always been the hot spot biomedical engineering, has significant meaning for the early-stage prediction of cardiovascular disease and family medical health care. Currently, with the development of electronic, communicative and software technique, the ECG manager has great promotion on size, power consumption, and data storage and data transmission. The property and quality of medical productions have great influence on the life security of the patients; therefore, researches of related topics become quite important in meaning. This paper analyses the current situation and trend of the development of ECG manager domestically and internationally，introduced the relatively concept and materials involved in the process. In addition use of the composition of the three op amp preamp circuit to enlarge the initial ECG, we also use analog low-pass and analog high-pass analog filter just like components band-pass to filter out signal interference, while the use of active notch filter frequency of 50Hz can further filt out interference, getting a more pure ECG signal. And then through the implementation of A/D conversion, single-chip processing system, the final test results will be displayed by LCD. The ECG analyzer has good characteristics such as low-power, portable and real-time and so on. KEY WORDS: ECG manager, amplification, filtering, virtual instrument 目录 1.1 背景介绍 1 1.2 相关概念 2 1.2.1 心电信号的基本特征 2 1.2.2 心电信号处理仪的生物学基础 3 1.2.3 心电导联 4 2.1 概念及特点 5 2.2 虚拟仪器的构成 5 2.3 Proteus简介 6 3.1 总体设计思路 8 3.2