基于陷波器的心冲击信号提取电路设计  

Design of Ballistocardiogram Extraction Circuit Based on Notch Filter

作　　者：冯静达 焦学军[1] 李启杰 曹勇[1] 姜劲[1] 傅嘉豪 郭娅美 杨涵钧[1] FENG Jingda;JIAO Xuejun;LI Qijie;CAO Yong;JIANG Jin;FU Jiahao;GUO Yamei;YANG Hanjun(National Laboratory of Human Factors Engineering,China Astronaut Research and Training Center,Beijing 100094,China)

机构地区：[1]中国航天员科研训练中心人因工程重点实验室,北京100094

出　　处：《载人航天》2020年第4期516-521,共6页Manned Spaceflight

基　　金：国家自然科学基金面上项目(81671861);载人航天预先研究项目(6142222180107);中国载人航天预先研究项目(SYFD160061801)。

摘　　要：心冲击(BCG)信号可用于航天员心率监测,针对现有BCG采集电路无法有效去除呼吸干扰的问题,设计了中心频率为0.3 Hz的双T型陷波器,利用陷波器幅频特性抑制频带较窄且幅度较大的呼吸信号,以实现BCG信号的有效分离。通过加入电压跟随器提高陷波器品质因数Q值,设计电位器控制陷波器带阻滤波的频带宽度和Q值高低,可达到动态调节滤波效果。采集6名健康男性志愿者平卧位的BCG信号数据,通过峰值检测即可有效提取心率,无体动干扰的数据段滤除呼吸波后BCG信号平均J波识别准确率达到99.12%。结果表明:提出的方法可有效抑制呼吸信号,实现BCG信号的前端分离和充分放大,以应用于航天员实时心率监测中。Ballistocardiogram(BCG)signal can be used to monitor the heart rate of astronauts.To solve the problem that the existing BCG acquisition circuit could not remove respiratory interference effectively,a double T-type notch filter with a center frequency of 0.3 Hz was designed.The amplitude-frequency characteristics of the notch filter were used to suppress the respiratory signal with narrow band and large amplitude to realize BCG signal separation.By adding a voltage follower to improve the Q value,a potentiometer was designed to control the band width and Q value of the notch filter,which could adjust the filtering effect dynamically.The BCG signal of six healthy male subjects in supine position was collected,while the heart rate information was extracted effectively by peak detection.The average J wave recognition accuracy of the BCG signal was 99.12%after the respiratory wave was filtered out in the data segment without body movement interference.The results showed that the proposed method could effectively suppress the respiratory signal and realize full amplification of BCG signal.This method may be applied to the real-time heart rate monitoring of astronauts.

关 键 词：心冲击 航天环境 陷波器 电路设计 

分 类 号：TB18[一般工业技术]