适用于嵌入式系统的心音心电信号采集仪

Circuit design of PCG and ECG signal acquisition used to portable devices and embedded system

心音信号(PCG)、心电信号(ECG)是人体重要的生理信号,携带大量生理特征,但这些微弱信号的提取极易受到外界的干扰。采用三导联的方式,利用仪用放大器AD623的优良特性提取心电信号,采用专用的集成心音传感器HKY-06B提取心音信号。另外,使用差分阀值的算法,通过心电信号可以精确地定位心音信号。系统采用+3 V电池供电,具有低功耗、低噪声和低电压的特点,为便携式设备和嵌入式系统的开发奠定了基础。

PCG and ECG Signals which carrying a large number of physiological characteristics,are important physiological signals of the body.However the approach of PCG and ECG signal acquisition is extremely difficult.In this paper,we used a practical three-lead method and high performance Instrumentation Amplifier AD623 to collect ECG signal.The specified integrated sensor HKY-06B was used in the PCG signal acquisition.Additionally,Differential Positioning,this special method was applied to locate the PCG signal.This low-power single-supply and low-noise circuit system,power supply is ＋3 V（two batteries supply）,which lays foundation for the development of embedded system and portable devices.