【摘要】：PET、fMRI、腦磁等高端設(shè)備在認(rèn)知腦功能研究手段中，發(fā)揮著極其重要的作用。相比其他眾多高端設(shè)備而言腦電圖設(shè)備具有使用和維護(hù)成本較低、時(shí)間分辨率較高等特點(diǎn)，在常用的研究、診斷技術(shù)中受到了科研工作者和臨床醫(yī)生的廣泛關(guān)注。本文設(shè)計(jì)了一種高性能，寬頻段具有阻抗檢測(cè)功能的八導(dǎo)腦電放大器。該腦電放大器前端采用高性能儀用運(yùn)放AD8221，和16位D/A組成直流校正差分放大器。直流抵消后的腦電信號(hào)通過(guò)陷波器和有源低通濾波器接至電子開(kāi)關(guān)。DSP控制電子開(kāi)關(guān)和A/D轉(zhuǎn)換循環(huán)采集八路腦電信號(hào)，同時(shí)DSP控制D/A進(jìn)行直流校正。采樣后的腦電信號(hào)通過(guò)USB2.0實(shí)時(shí)上傳至上位機(jī)。上位機(jī)將采集到的腦電信號(hào)以文本形式存儲(chǔ)至PC機(jī)。 為了驗(yàn)證腦電放大器的性能，我們記錄了睜眼和閉眼的自發(fā)腦電。最后還將此腦電放大器接入我們實(shí)驗(yàn)室開(kāi)發(fā)的SSVEP系統(tǒng)中，被試在進(jìn)行視覺(jué)刺激時(shí)，我們?cè)O(shè)計(jì)的八導(dǎo)腦電放大器能夠明顯記錄到穩(wěn)態(tài)視覺(jué)誘發(fā)電位。因此，本文設(shè)計(jì)的八導(dǎo)腦電放大器可以應(yīng)用于認(rèn)知腦功能研究中，，還可為臨床醫(yī)生和BCI領(lǐng)域提供良好的研究平臺(tái)。
[Abstract]:High-end equipment, such as PET,fMRI, plays an extremely important role in cognitive brain function research. Compared with many other high-end equipment, EEG equipment has the characteristics of low cost of use and maintenance, high time resolution and so on. It has been widely concerned by researchers and clinicians in the common research and diagnosis technology. In this paper, a high performance, wide band impedance detection EEE amplifier is designed. The front end of the EEG amplifier consists of a high performance operational amplifier AD8221, and a 16 bit D / A DC corrected differential amplifier. The EEG signal after DC cancellation is connected to the electronic switch by notch filter. DSP controls the electronic switch and the A / D converter circulates to collect eight EEG signals, while DSP controls D / A for DC correction. The sampled EEG signals are uploaded to the host computer by USB2.0 in real time. The upper computer stores the collected EEG signals in the form of text to the PC machine. To verify the performance of EEG amplifiers, we recorded spontaneous EEG of open and closed eyes. Finally, the EEG amplifier is connected to the SSVEP system developed by our laboratory. When the subjects are given visual stimulation, the eight conductance EEG amplifier we designed can record the steady-state visual evoked potential (VEP) obviously. Therefore, the eight-conductance EEG amplifier designed in this paper can be applied to cognitive brain function research and provide a good research platform for clinicians and BCI.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：R318

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相關(guān)期刊論文 前1條

1 王繼軍,張明島;腦電Gamma共振信號(hào)在精神疾病中的研究應(yīng)用[J];上海精神醫(yī)學(xué);2005年04期

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