ECG与PPG多通道信号采集系统滤波延迟补偿研究
关键词： 心电信号采集; 脉搏信号采集; 滤波延迟; 多通道信号; 延迟补偿; 信号同步
中图分类号： TN911.23⁃34; TP394.1; TH691.9 文献标识码： A 文章编号： 1004⁃373X（2019）14⁃0041⁃05
Research on filtering delay compensation of ECG and PPG
multi⁃channel signal acquisition system
WU Guansheng1， WEI Haicheng1， LI Qun2， XIAO Mingxia1
（1. School of Electrical and Information Engineering， North Minzu University， Yinchuan 750021， China;
2. Laboratory Construction and Management Department， North Minzu University， Yinchuan 750021， China）
Abstract： Multi⁃channel synchronous acquisition of ECG and PPG signals is the basis of nondestructive cardiovascular health risk assessment studies. In order to solve the problem of filtering delay in ECG and PPG signal acquisition， a scheme for ECG and PPG signal acquisition and compensation is proposed， which makes the acquisition system realize the true synchronization. In this scheme， the delay of each circuit unit in ECG and PPG signal acquisition process is estimated by simulation， the delay of the two signal acquisition processes is measured by means of the signal generated by the function generator， and then the measured results are compared with the simulation results. On this basis， the phases of the ECG and PPG signals are adjusted to compensate the delays of the signals. Finally the absolute synchronization of the signals is achieved. The experimental results show that the hardware delay of ECG and PPG multi?channel acquisition system is mainly concentrated in the filtering process. According to the test， the actual delay value between the two groups of signal channels in the existing design scheme is 2.012 ms...
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