8通道便携式脑电放大器设计

发布时间：2018-06-17 05:37

  本文选题：便携 + 模拟前端　； 参考：《电子科技大学》2014年硕士论文

【摘要】：脑电作为大脑活动的电信号表现,以其很高的时间分辨率一直受到科研领域的广泛重视。随着科学技术的发展,之前一直作为临床神经诊断和认知心理研究的脑电技术,也被应用到了神经衰弱等疾病的诊断和治疗。一些便携式的脑电图仪作为家用医疗设备也开始走向了普通家庭。本文的目的在于研究一种便携式的、性能相对稳定的脑电采集系统,用作普通的脑机接口实验和日常的家庭应用。本系统主要包括集成模拟前端和数字部分。采用集成模拟前端代替集成运放来构建放大和AD转换电路,这样一方面确保了系统的性能,另一方面也减小了系统的功耗和体积。采用高性能DSP芯片作为控制核心,确保了系统性能的稳定。使用USB2.0作为数据传输协议,保证了多通道数据的快速、准确传输。在软件设计方面,优化了上位机采集程序,加入了数字滤波程序,节约了硬件成本,减小了硬件体积,确保了系统的性能。为了验证系统的性能,对其部分性能指标进行了测试,基本达到了便携式脑电采集系统的需要。为了确保其能够应用在脑电采集中,进行了脑电实验,对被试的自发脑电进行采集。从结果上分析,该系统能够采集到基本的自发脑电信号——α波。说明本系统能够应用于简单的脑机接口实验和家庭应用中。
[Abstract]:Electroencephalogram (EEG), as the electrical signal of brain activity, has been widely recognized in the field of scientific research with its high time resolution. With the development of science and technology, EEG technology, which has been used as clinical neural diagnosis and cognitive psychology, has also been applied to diagnosis and treatment of neurasthenia and other diseases. Some portable electroencephalogram (EEG) The purpose of this paper is to study a portable and relatively stable EEG acquisition system, which is used as an ordinary brain machine interface experiment and daily family application. This system mainly includes integrated analog front end and digital part. Integrated analog front end is used instead of integrated operation and amplifier. To build up the amplifier and AD conversion circuit, in this way, the performance of the system is ensured. On the other hand, the power and volume of the system are reduced. The high performance DSP chip is used as the control core to ensure the stability of the system performance. USB2.0 is used as a data transmission protocol to ensure the rapid and accurate transmission of multi-channel data. On the other hand, the PC acquisition program is optimized and the digital filter program is added to save the hardware cost, reduce the hardware volume and ensure the performance of the system. In order to verify the performance of the system, some performance indexes are tested, and the needs of the portable EEG collection system are basically achieved. The EEG experiment was carried out to collect the spontaneous EEG of the subjects. From the results, the system can collect the basic spontaneous EEG - alpha wave, which shows that this system can be applied to simple brain machine interface experiment and family application.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH789;R741.044
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本文编号：2029930