基于DDS算法的12导联心电信号发生器设计  

Design of 12 lead ECG signal generator based on DDS arithmetic

作　　者：何乐生[1] 

机构地区：[1]云南大学信息学院,昆明650091

出　　处：《仪器仪表学报》2010年第2期275-280,共6页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60561002);云南省应用基础研究面上项目(2008CD080);云南省教育厅科学研究基金(08Y0012)资助项目

摘　　要：心电信号发生器是研发智能心电仪器的关键设备,心率连续可变是心电信号发生器研究的难点。提出了一种用DDS(direct digital frequently synthesis)算法合成心率连续可变的多导联心电信号的方法,并在基于ARM的嵌入式实时操作系统uC/OS-II上用软件实现了该方法。首先证明了用软件实现DDS算法产生心电信号的可行性;针对心电信号的频率特点给出了算法的基本参数;并根据DDS算法思想给出了一种查找表(LUT)长度调整的方法;最后分析了本方法误差的主要来源,通过理论推导得出系统误差为26×10-6。实验结果证明本方法行之有效,具有理论和实际意义。ECG signal generator is a key apparatus in the development of intelligent ECG equipment.How to create a consecutive variable heart rate ECG is the difficulty of ECG signal generator.In this paper,a method based on DDS（direct digital frequently synthesis） arithmetic for multi-lead ECG is given,which is realized on the ARM7 processor based real-time operating system uC/OS-II.At first,the thesis proves the feasibility of the method based on DDS arithmetic.The primary parameters of the arithmetic are elicited according to the frequency characteristics of ECG signal.Then,the paper gives out a means to adjust the length of LUT.At last,the main source of the frequency error is analyzed.And theoretical derivation indicates that the system error of the method is 26×10^-6Experiment results indicate that the proposed method is effective and has important theoretical and practical values.

关 键 词：DDS算法 心电信号发生器 嵌入式实时操作系统 ARM ECG 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]