心冲击图信号采集与处理系统的设计与实现

The Design and Accomplishment of the Acquisition and Processing of Ballistocariogram Signal

心冲击图(ballistocardiogram,BCG)信号是一种记录心脏活动引起的身体震动的方法,是心脏监测的方法之一。我们设计并实现了基于CPLD(complex programmable logic device,CPLD)的心冲击图信号采集与处理系统,将四个电阻应变式称重传感器固定在椅子下方,对BCG信号进行采集,并采用利于硬件实现的提升小波变换方法对采集到的BCG信号进行去噪处理,最后使用示波器实时显示处理结果,为BCG信号应用于日常生活中的心脏监护奠定了基础。

Ballistocardiogram is a graphical representation of the recoil from the pumping action of the heart,by which cardio motility is monitored.The acquisition and processing system of ballistocariogram signal based on the CPLD(complex programmable logic device) is designed and accomplished.Four resistance strain weighing sensors used in electronic weight scale are fixed under a chair to acquire signals and it takes advantage of lifting wavelet transform which benefits the accomplishment of hardware for BCG signal de-noise.Finally,it uses oscilloscopic real-time processing result and lays the foundation of BCG signal on heart function monitoring in daily life.