基于稳态视觉诱发电位的电力载波传输控制系统研究

Research on power line carrier transmission control system based on steady state visual evoked potential

利用人体的脑电信号控制外界的设备是一种新型的人机交互方式,依此展开了基于稳态视觉诱发电位的电力载波传输控制系统的研究。设计了一套脑电实时控制家庭终端的新型智能家居系统。系统中融合了电力载波通信技术,不仅解决了那些行动不便的人群与外界交流的问题,也解决了传统控制模式中射频干扰与传输距离限制的问题。系统采用单片机控制LED作为视觉刺激器。脑电算法处理在Lab VIEW平台上进行,利用功率谱估计实时提取诱发电位向量,产生脑_机接口控制命令,控制命令通过电力载波模块实现在家用电力线的传输,并最终在家庭终端实现动作控制。通过实验验证,设计的系统平均识别率在95%以上,平均单次对家电开关控制的时间在6 s左右。

It is a new man?machine interaction way to control the external devices with the human EEG. Therefore,the power line carrier transmission control system based on steady state visual evoked potential(SSVEP)is researched. A set new intelligent home system to control the home terminals with EEG in real time was designed. The power line carrier communication technology is integrated in the system to solve the communication problem between the man of limited mobility and outside world,and also solve the limitation problem between RF interference and transmission distance of the traditional control mode. The LED controlled by single chip microcomputer is taken as the visual stimulator in the system. The EEG algorithm is pro?cessed on LabVIEW platform,in which the power spectrum estimation is used to extract the evoked potential vector in real time to generate the brain?computer interface (BCI) control command. The control command can realize the household power line transmission through the power line carrier module and operation control in home terminal. The experimental results verify that the average recognition rate of the designed system can reach up to 95%,and the average control time for single household app?liance switch is about 6 seconds.