基于ARM的脑机交互信号采集系统设计

Signal Acquisition System for Brain Computer Interface Based on ARM

在脑机交互(BCI)中,基于ARM以太网接口设计了脑电信号采集系统,主要由以太网控制器、ARM处理器、LCD液晶触摸屏组成。以太网控制器实时接收EEG信号处理器通过以太网发送来的脑电数据包,然后通过SPI接口将数据包送到ARM处理器内部,接收完毕后ARM处理器将数据包层层解封,最终得到脑电数据,进而可对脑电数据进行进一步处理,同时通过LCD液晶屏实时显示脑电图。相对于以电脑为中心的传统脑机交互信号采集系统,该系统具有体积小、能耗低、携带方便和实用化强等优点。试验证明,脑电信号的采集以及一些简单的信号处理可以在该系统中很好地实现。更多的信号处理正在进一步的试验中。本设计将逐步代替电脑,成为脑电信号采集和处理的中心,为脑机交互技术的实际应用提供可能,促进脑机交互研究向小型化,产品化方向发展。

For a BCI（brain computer interface）,an electroencephalogram（EEG） signal acquisition system based on ARM Ethernet interface is designed,which mainly consists of Ethernet controller,ARM processor,and LCD touch-screen.Ethernet controller firstly receives a packet that contains the EEG data in real time via a network cable in TCP/IP protocol format.Then the packet will be sent to ARM processor through SPI.After that,it will reopen the packet layer by layer until the required EEG data are obtained.Finally,the EEG data can be analyzed and displayed in real time via the LCD screen.Compared with the traditional signal acquisition system for BCI,which takes the computer as the center,the proposed system has advantages of small size,low energy consumption,easy to carry and good practical application.The experimental results show the signal acquisition and some signal analysis can be well implemented in this system.More signal analysis is further tested.The system will gradually replace the computer,becomes the center of signal acquisition and analysis for BCI.The system also promotes BCI research to miniaturization and product.