坐立两便式心冲击信号检测系统设计与实现

Design and Development of a Sitting and Standing Dual-Purpose Style Ballistocardiography Signal Detecting System

设计并实现了一种坐立两便式心冲击(BCG)信号检测系统.该系统采用高精度A/D转换芯片TM7708、程控比例放大和数字滤波技术实现了BCG信号检测.采用小波分析技术对信号进行消噪处理,以提取特征波形,并通过VB软件编程实现心率自动检测.采集30例心冲击信号,与同步采集的单通道心电信号进行对比.结果表明,两种信号的节律一致,心率检测准确率达98.2%,验证了系统的正确性.该系统便携式的设计方便受试者随时对心脏机械活动进行监测,也为后续心脏和呼吸信号提取和分析提供了可靠依据.

A sitting and standing dual-purpose ballistocardiography （BCG） signal detecting system was put forward and implemented. The high-precision A/D converter chip TM7708, the program-controlled scaling amplification technology and the digital filtering technology to detect BCG signals were adopted in the system. By using wavelet analysis for the noise elimination, the characteristic waveform was extracted, and at last, the heart rate can be detected automatically through VB software programming. The system was tested by using 30 healthy people as samples. These BCG signals were compared with the single-channel electrocardiosignal acquired synchronously. The results showed that the two kinds of signals were synchronous. The accuracy of the heart rate detection was about 98.2 %. It verifies the feasibility of the developed system. The portable system can automatically detect the BCG signals of the subjects at any time, which will provide a reference for the extraction and analysis of heart and respiratory signals.