多通道心电采集系统设计
发布时间：2018-08-20 11:08
【摘要】：在现代社会中,更多的人对心电监护设备的需求越来越强烈。一些患有轻微心脏疾病或者是刚经历疾病处于恢复期的病人,需要在日常生活中随时监护自身心脏的情况；也有一些心脏病患者会有突发疾病的可能,需要长时问的观察以捕捉某些特殊信息；还有一些活动不是很方便的病人,不能时常去医院就诊。基于上述的情况,设计一种便携式心电监护设备实时检测人体心脏状态并进行数据分析,对于心脏疾病的及早发现以及治疗具有重要意义。 本文介绍了一种基于国际12导联标准的多通道便携式心电监护设备,该设备分别由模拟板和数字板组成。 模拟板的电路主要由输入缓冲电路、前置放大电路、50Hz陷波电路、高通滤波电路、低通滤波电路、主放大电路、电平抬升电路、基于MSP430单片机的A/D转换电路以及通道巡检电路组成。主要作用为对采集到的心电信号进行放大、滤波的同时,抑制夹杂在心电信号中的共模干扰信号,并最终将调理后的心电信号传送给MSP430集成的A/D转换器进行模数转换。在MSP430外围电路方面,使用外部+3.3V电源为ADC12供电,使用频率为32768Hz的低频晶振作为定时器Timer_A的辅助时钟,从而控制ADC12的采样频率。在A/D转换软件方面,将ADC12配置成序列通道单次转换模式,采样频率控制在500Hz。最终利用串口以波特率11520bps的速度将数据传送给ARM。 数字板的电路主要由ARM(S3C2440)处理器及相关的外围电路、无线发射模块电路、无线接收模块电路组成。其中无线发射模块的主控MCU为ARM处理器,而无线接收模块的MCU为AT90S8515单片机。ARM处理器主要完成心电数据的数字处理,而外围电路中的FLASH、SD卡作为数据的存储器,TFT触屏作为显示设备起到人机交互的作用。在ARM处理器与PC终端的通信中,本系统使用的无线传输电路取代了传统的RS232串口或者USB口方式,使心电设备的使用不受短距离的约束。在无线发射模块以及接收模块中,分别由ARM和AT90S8515单片机控制发送／接收芯片nRF905完成心电数据的无线通信。在接收模块中AT90S8515将接收到的数据以USB口的方式传递给PC终端,由PC完成最终的数据分析处理。
[Abstract]:In modern society, more and more people demand ECG monitoring equipment more and more. Some patients who have mild heart disease or have just experienced a disease in recovery need to monitor their heart condition at any time in their daily lives. There are also patients with heart disease who have the possibility of sudden disease. Long-asked observations are required to capture specific information; there are also patients who are not very convenient to visit the hospital. Based on the above situation, the design of a portable ECG monitoring device for real-time detection of human heart state and data analysis is of great significance for early detection and treatment of heart disease. A multi-channel portable ECG monitoring device based on international 12-lead standard is introduced in this paper. The equipment is composed of analog board and digital board respectively. The analog circuit is mainly composed of input buffer circuit, preamplifier circuit and 50Hz notch circuit, high pass filter circuit, low pass filter circuit, main amplifier circuit, level lifting circuit, The A / D conversion circuit based on MSP430 single chip microcomputer and the circuit of channel inspection are composed. The main function is to amplify and filter the collected ECG signal, suppress the common-mode interference signal mixed in the ECG signal, and finally transmit the adjusted ECG signal to the MSP430 integrated A / D converter for analog-to-digital conversion. In the peripheral circuit of MSP430, the external 3.3V power supply is used to supply the ADC12, and the low-frequency crystal oscillator with the frequency of 32768Hz is used as the auxiliary clock of the timer Timer_A to control the sampling frequency of ADC12. In the aspect of A / D conversion software, the ADC12 is configured into the sequence channel single conversion mode, and the sampling frequency is controlled at 500 Hz. Finally, the serial port is used to transmit the data to ARM at the speed of baud rate 11520bps. The circuit of digital board is mainly composed of ARM (S3C2440) processor and related peripheral circuits, wireless transmitting module circuit and wireless receiving module circuit. The main control MCU of wireless transmitting module is ARM processor, and the MCU of wireless receiving module is AT90S8515 single chip microcomputer. Arm processor mainly completes the digital processing of ECG data. Flash SD card in peripheral circuit acts as the memory of data and TFT touch screen as display device plays the role of man-machine interaction. In the communication between ARM processor and PC terminal, the wireless transmission circuit used in this system replaces the traditional RS232 serial port or USB port mode, so that the use of ECG equipment is not restricted by short distance. In the wireless transmitting module and receiving module, ARM and AT90S8515 MCU control the sending / receiving chip nRF905 to complete the wireless communication of ECG data. In the receiving module, AT90S8515 transfers the received data to the PC terminal as a USB port, and the PC completes the final data analysis and processing.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.6;TP274.2
本文编号：2193360
[Abstract]:In modern society, more and more people demand ECG monitoring equipment more and more. Some patients who have mild heart disease or have just experienced a disease in recovery need to monitor their heart condition at any time in their daily lives. There are also patients with heart disease who have the possibility of sudden disease. Long-asked observations are required to capture specific information; there are also patients who are not very convenient to visit the hospital. Based on the above situation, the design of a portable ECG monitoring device for real-time detection of human heart state and data analysis is of great significance for early detection and treatment of heart disease. A multi-channel portable ECG monitoring device based on international 12-lead standard is introduced in this paper. The equipment is composed of analog board and digital board respectively. The analog circuit is mainly composed of input buffer circuit, preamplifier circuit and 50Hz notch circuit, high pass filter circuit, low pass filter circuit, main amplifier circuit, level lifting circuit, The A / D conversion circuit based on MSP430 single chip microcomputer and the circuit of channel inspection are composed. The main function is to amplify and filter the collected ECG signal, suppress the common-mode interference signal mixed in the ECG signal, and finally transmit the adjusted ECG signal to the MSP430 integrated A / D converter for analog-to-digital conversion. In the peripheral circuit of MSP430, the external 3.3V power supply is used to supply the ADC12, and the low-frequency crystal oscillator with the frequency of 32768Hz is used as the auxiliary clock of the timer Timer_A to control the sampling frequency of ADC12. In the aspect of A / D conversion software, the ADC12 is configured into the sequence channel single conversion mode, and the sampling frequency is controlled at 500 Hz. Finally, the serial port is used to transmit the data to ARM at the speed of baud rate 11520bps. The circuit of digital board is mainly composed of ARM (S3C2440) processor and related peripheral circuits, wireless transmitting module circuit and wireless receiving module circuit. The main control MCU of wireless transmitting module is ARM processor, and the MCU of wireless receiving module is AT90S8515 single chip microcomputer. Arm processor mainly completes the digital processing of ECG data. Flash SD card in peripheral circuit acts as the memory of data and TFT touch screen as display device plays the role of man-machine interaction. In the communication between ARM processor and PC terminal, the wireless transmission circuit used in this system replaces the traditional RS232 serial port or USB port mode, so that the use of ECG equipment is not restricted by short distance. In the wireless transmitting module and receiving module, ARM and AT90S8515 MCU control the sending / receiving chip nRF905 to complete the wireless communication of ECG data. In the receiving module, AT90S8515 transfers the received data to the PC terminal as a USB port, and the PC completes the final data analysis and processing.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.6;TP274.2
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