基于DSP和ARM的便携式脑电信号处理系统的实现

Portable EEG Signal Processing System Based on DSP and ARM

为使脑一机接口技术(brain-computer interface,BCI)面向实用化、产品化,建立便携式的处理平台成为重要研究问题;系统采用现场可编程门阵列(FPGA)控制VGA显示器,设计了多功能视觉诱发刺激器,实时在线产生多种组合模式的刺激信号,诱发稳态视觉诱发电位;信号采集后放入到数字信号处理器(DSP)中,经过FIR滤波和FFT算法的处理后,得到辨识度较高的视觉诱发电位信号,并由无线将数据发送给STM32处理器,在LCD触屏上实时显示;实验结果表明系统实时采集、处理、显示脑电信号,相对于目前的BCI系统实现了多平台的便携式。

In order to make it possible for the brain - computer interface （BCI） to get rid of the PC, so establishing practical and pragmatic products, as well as a portable processing platform has become a vital study. This system adopts field-programmable gate array （FPGA） to control VGA monitor and design a multi purpose visual evoked stimulator, thus the system can produce a variety of combinations of real-time online mode stimulation signals to induce steady-state visual evoked potential of people. When the signal was collected into a digital signal processor （DSP）, the FIR and FFT will process this signal so as to obtain a higher recognizable of the visual evoked potential signals. Then the data will be transmitted by radio to the processor STM32 and display on the LCD touch screen at the real time. This system acquires, processes and displays EEG at the real-time, thus it achieved the portable pattern from the stimulator, acquisition and processing platform to display. Besides, it is available to be transplanted into other miniature devices.