簡易遠程心電監護系統

字數:10655.頁數:28  電子機電論文編號:JD378
簡易遠程心電監護系統
目錄
1 摘要………………………………………………………………………………8
Abstract……………………………………………………………………………8
2 設計分析與方案論證……………………………………………………………10
  2.1 原理分析和說明……………………………………………………………10
      2.1.1 心電信號放大電路基本原理………………………………………10
      2.1.2 心電圖原理說明……………………………………………………10
      2.1.3 心電信號特點分析…………………………………………………11
  2.2 數據采集部分………………………………………………………………12
      2.2.1 前置放大部分………………………………………………………12
3 心電信號處理部分………………………………………………………………15
  3.1 屏蔽電路……………………………………………………………………15
  3.2 濾波器………………………………………………………………………15
  3.3 A/D、D/A轉換電路…………………………………………………………18
  3.4 調制與解調電路……………………………………………………………22
      3.4.1 調制器………………………………………………………………22
      3.4.2 解調器………………………………………………………………22
  3.5 3KHZ低通濾波………………………………………………………………24
      3.5.1 有源濾波……………………………………………………………24
      3.5.2 數字濾波方案………………………………………………………24
4 穩壓電源…………………………………………………………………………25
  4.1 保護功能……………………………………………………………………26
  4.2 瞬變電壓的防護……………………………………………………………26
總結…………………………………………………………………………………28
參考文獻……………………………………………………………………………29

1、摘要
本系統利用高精度通用運算放大器INA128對輸入的心電信號進行放大，再進行濾波，濾去頻率較高生物電信號，同時采用右腳屏蔽驅動電路，消除50Hz干擾信號，然后通過信號變換，經過3KHz低通濾波器（仿真普通電話信道），最后在醫院站通過信號接收和變換，實現醫院監護站實時顯示。在普通示波器上得到清晰的心電波形，并可看出采樣率。
經放大處理后的心電信號通過A/D轉換器AD7701轉換成數字信號，然后XRR2206調制電路對數字心電信號進行調制；在醫院接收端先經過解調電路解調，再通過D/A轉換器DAC0808轉換成模擬信號，最后在示波器上顯示心電信號波形。
關鍵詞：心電信號  儀表放大器  有源濾波  調制解調
The simple long range  heart electricity serves as guardian the system
Abstract::
This system makes use of the high accuracy  in general use operation  enlarger INA128 to carry on enlarge to the heart telecommunication number of the importation, then carry on the wave of  , the  goes to the frequency  higher living creature  telecommunication number, adopting the right foot to shield to drive the electric circuit at the same time, remove the 50 Hz  interference signal, then pass the signal transformation, through a filter( imitate the true common telephone  letter way) of 3 KHz, the end stands to receive through a signal at the hospital and transformation, carry out the hospital guardianship station to show for solid hour.Show a machine in the commonness up get the clear heart  electric wave form, and can see a sample rate.
Pass through enlarge the heart telecommunication number of handle the empress the A/ D  conversion machine  AD7701 conversion become the numerical signal, then the XRR2206 make the electric circuit logarithms  word heart  telecommunication number to carry on make;Receive to carry at the hospital to adjust the electric circuit solution to adjust through solution first, then pass the D/ A  conversion machine DAC0808 conversion to become the emulation signal, the end shows the heart telecommunication  number a form in showing a machine.
Keyword:  The heart electricity  signal appearance enlarger contain the source  wave make the solution to adjust