【正文】 iseases that threaten human health. But the discovery means of cardiovascular diseases mainly depends on electro cardiac signal (ECG signal) now. Therefore, acquisition of ECG information continuously, accurately and real time can provide a significant basis for the clinical diagnosis of cardiovascular diseases. This paper first analyses the properties of ECG signal. The ECG signal is the weak signal. The amplitude of the ECG signal is from10uV to 5mV ,The frequency changes to 250Hz .The ECG signal is inundated with 50 electric frequency signal. The amplifying quality of ECG signal directly influences the function of the instrument and the diagnosis of the heart diseases． The full attention is paid to the properties of ECG signal and an ECG signal amplifying circuit is designed in this paper. A differential amplifier circuit is designed in the front end to extract highquality ECG. The signal conditioning circuit is designed in the middle part of the system to filtering, noise reduction and shaping and use Multisim to simulator relevant circuit, the result of Simulator shows that the function of amplifying circuit and filter are very well and it can acplish the task of the ECG signal amplifying well. At the end of the system , 51 microcontroller as the main chip to count and display the heart rate. Key words: ECG signal； Signal treatment； 51 microcontroller； Heart rate 目錄 第 1 章 緒論 ......................................................................................................................... 1 心電信號(hào)采集的發(fā)展歷史 ...................................................................................... 1 心電信號(hào)采集的現(xiàn)狀 .............................................................................................. 2 課題研究的意義 ...................................................................................................... 3 第 2 章 研究基礎(chǔ) ................................................................................................................. 4 人體心電信號(hào) .......................................................................................................... 4 心電信號(hào)的產(chǎn)生 ............................................................................................ 4 體表心電圖 .................................................................................................... 5 心電信號(hào)的特征 ............................................................................................ 6 心電信號(hào)的噪聲來源 .............................................................................................. 6 心電導(dǎo)聯(lián) .................................................................................................................. 6 第 3 章 心電信號(hào)檢測(cè)電路硬件設(shè)計(jì) ................................................................................. 8 心電信號(hào)檢測(cè)電路的設(shè)計(jì)要求 ............................................................................. 8 心電信號(hào)檢測(cè)電路總體框架 ................................................................................. 8 檢測(cè)電路設(shè)計(jì) .......................................................................................................... 9 芯片選型 ........................................................................................................ 9 前置放大電路設(shè)計(jì) ...................................................................................... 10 右腿驅(qū)動(dòng)電路 .............................................................................................. 11 帶通濾 波電路 .............................................................................................. 12 陷波電路 ...................................................................................................... 14 電平抬升電路 .............................................................................................. 15 心電信號(hào)整形電路 ...................................................................................... 16 第 4 章 控制、顯示電路設(shè)計(jì) ........................................................................................... 18 中央處理器及其外圍模塊 ................................................................................... 18 單片機(jī)概述 ................................................................................... 18 單片機(jī)輔助電路 ........................................................................... 19 顯示模塊及其電路設(shè)計(jì) ....................................................................................... 20 數(shù)碼管顯示模塊 .......................................................................................... 20 顯示模塊電路連接 ............................................................................................. 21 軟件部分設(shè)計(jì) ....................................................................................................... 22 keil 開發(fā)軟件簡(jiǎn)介 ....................................................................................... 22 軟件設(shè)計(jì)框圖 .............................................................................................. 23 顯示程序 ...................................................................................................... 23 第 5 章 總結(jié)與展望 ........................................................................................................... 26 總結(jié) ....................................................................................................................... 26 展望與未來 ........................................................................................................... 26 參考文獻(xiàn) ............................................................................................................................. 28 致謝 ..................................................................................................................................... 29 附錄 A 外文資料翻譯 ...................................................................................................... 30 英文 ......................................................................................