臺灣博碩士論文加值系統

本論文的目的是設計與建立一個16通道腦波記錄系統。所研發的硬體系統部份包括類比電路的前置放大器，可程式增益放大器和濾波器等及數位電路的同步式數位化電路，資料傳輸介面和數位光耦合隔離等。結合本實驗室所發展的圖控式人機介面系統，建立一個完整的腦波量測系統。
為了減少雜訊干擾，因此研製一個具有高放大倍率、高共模拒斥比、高輸入阻抗和低雜訊的放大電路以提高腦電信號的訊雜比。透過同步式數位化電路將類比腦電信號轉成數位信號，以避免通道間產生相位誤差。再由經資料傳輸介面將數位資料以串列方式傳送至個人電腦端做即時處理。同時在資料傳輸介面和個人電腦端加上數位光耦合隔離電路使本系統兼具電性的安全隔離和抗雜訊干擾的功能。
此系統經標準儀器測試結果顯示，在腦電信號頻率範圍內（0.2-120 Hz）具有高放大倍率（80 dB - 100 dB ）及低等效輸入雜訊電壓（< 0.5 μVp-p）。在醫院腦波室內以正常人做閉眼休息量測時，結果有明顯的α波信號特徵出現，因此驗證本系統可提供後續研究者進行腦電信號的擷取和研究。

A 16-chnnel EEG recording system is implemented. It is mainly divided into two parts. The analogy circuits part consists of instrumentation amplifier, programmable gain amplifier and filter. The digital circuit part consists of synchronous analogy-to-digital circuit, data transfer interface and digital optically was coupled isolation circuit. It combines with graphic user interface which developed in our laboratory to set up a complete EEG recording system.
To reduce interference , a amplifier whose high input impedance, high common mode rejection ration (CMRR), low noise and high gain is designed and implemented. Analog to digital conversion for the 16-channel system is accomplished by synchronous analogy-to-digital circuit. Digitized data is transmitted through RS232 lines to a serial port interface in the personal computer. To prevent electrical shock and reduce interference, the digital optically coupled isolator is used between data transmission interface and personal computer.
After the system was tested and characterized by a standard instrument, the results show that it is high gain (80 dB - 100 dB) and low equivalent input noise voltage (< 0.5 μVp-p ) over EEG''s spectrum (0.5Hz - 100 Hz). We have made the physical measurement in a hospital. The result show that clearαwave was presented when his eyes were close . The results also provided the evidence of the performance for this EEG recording system and it can provide a basic tool for the study about EEG.

中文摘要
英文摘要
圖索引
表索引
第一章 緒論
1-1腦電圖簡介
1-1.1 腦電圖之沿革
1-1.2 腦波的產生
1-1.3腦波的分類
1-2 腦波機在臨床上的應用
1-3 現行腦波機系統的架構
1-4 數位腦波機的優勢
1-5 研究動機和目的
1-6 論文架構
第二章 數位腦波機系統之設計
2-1系統硬體架構
2-2系統傳輸端架構
2-3系統軟體架構
2-4 硬體系統設計之規格
第三章 類比電路設計
3-1 雜訊干擾源分析
3-2 市電干擾分析
3-3電極干擾分析
3-4電路雜訊分析
3-4.1 雜訊種類
3-4.2 雜訊的評估
3-4.3串接級的雜訊因素
3.4-4運算放大器的雜訊分析
3-5 類比電路架構
3-5.1儀表放大器
3-5.2高通濾波器
3-5.3增益放大電路和增益選擇電路
3-5.4低通濾波器
第四章 數位硬體設計
4-1數位化電路
4-2資料傳輸介面
4-3 電性安全隔離電路
第五章 測試結果與討論.
5-1 類比電路測試
5-1.1放大增益測試
5-1.2 頻率響應測試
5-1.3 雜訊分析
5-1.4 小信號測試
5-2 數位電路測試
5-3 人體測試
5-4 實驗討論
第六章　結論與未來展望
6-1結論
6-2未來展望
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