【作者】 张晓明；

【导师】 刘红星；

【作者基本信息】 南京大学 ， 信号与信息处理， 2012， 硕士

【摘要】 高精度心电检测是心电信号分析诊断的基础。本文面向如何进行高精度心电检测做了若干研究工作。首先,介绍了心电的产生和典型心电检测系统,以此引出了高精度心电检测的意义；然后,论文第二章对提高心电检测精度的方法进行了概述,讨论了人体信号源、噪声及干扰的特点,从抑制干扰、调节输出失调、降低固有噪声等三个方面归纳了提高精度的常见方法。第三章,针对模拟前端电路,首先,验证了仪表放大失调调整、右腿驱动、屏蔽驱动等常见高精度电路实现方法的实际效果；对带通滤波电路提出了多路平均减小电路噪声的方法；设计了后级放大电路和电源使用方案；最后,对整个模拟前端电路按优化的方案给予了电路实现,经测试,电路的动态范围达到93dB。第四章,基于TI公司C5515DSP芯片,介绍了C5515EVM验证板的资源、功能、特点,并对其做了应用探索,主要包括SPI通信和硬件实现FFT。设备使用环节中电极放置的好坏也影响检测的精度,本文第五章研究了高精度心电检测中不同电极模式的自动识别问题。第六章是全文的总结与展望。更多还原

【Abstract】 High precision ECG detection is the basis of ECG analysis and diagnosis. This article does some investigations for high precision ECG detection. First of all, we discuss ECG theory and typical ECG systems and point out the benefit of high precision ECG detection; Then, the second section summarizes the characteristics of a source ECG signal, noises&interferences, and common methods for improving detection precision:interference suppression, adjustment of offset voltage and reducing inherent noise.The third section focuses on the analog front end circuit. First of all, we validate the performance of common solution to high precision circuit (the adjustment of instrument amplifier offset voltage, right leg drive circuit); design band pass circuit using multi-channel average method to reduce circuit noise; make the second stage amplifier and power supply for the analog front end; at last, implement the optimized analog front end circuit,and test the circuit board, the dynamic range of the realized analog front end being up to93dB. The4th section is about the C5515processor, we give the introduction to the feature of C5515EVM board, and explore two applications including SPI communication and hardware accelerate FFT coprocessor. Electrodes usage in the ECG monitoring process also has impact on high precision detection, so in the5th section we discuss automatic identification for different electrode patterns in ECG monitoring, Chapter6gives a summary of the paper and the prospect for future study.更多还原