摘要
目的:在Active One生理信号采集系统基础上采用Labview和VC编程实现基于视觉诱发电位的脑机接口实时系统。方法:数据采集软件采用Labview编程实现,采用VC编程实现脑机接口人机界面、实时信号处理及动态链接库,Labview和VC通过动态链接库共享内存实现数据传输。视觉刺激界面设计采用了多媒体定时、DirectDraw技术和并口输出技术。采用累加平均与5点平均滤波提取视觉诱发电位信号,再通过计算相关系数实现信号识别。结果:实验表明,刺激模块能产生有效的视觉刺激。基于动态链接库的数据传输能满足系统要求,实现VC与Labview程序的同步控制。结论:本文提出的实时信号处理方法能提高信噪比,实现视觉诱发电位的提取与识别,判断出受试者所注视的目标,并将结果实时反馈到人机界面,实现了脑机接口实时系统。
Objective： Labview and VC were used to design software based on the Active One biopotential measurement system to realize the visual evoked potential based brain-computer interface. Methods： The data acquisition software was designed by Labview, the human-interface, real time signal processing and dynamic link library software were designed by VC. Data transmission between Labview and VC was realized through the dynamic link library using shared memory technology. The multimedia timer, DirectDraw technology and parallel port data output were used to design the visual stimulation interface. The 5 points averaging filter combining with averaging method were used to detect the visual evoked potential and the correlation coefficient was computed for signal recognization. Results： The experiments showed that the visual stimulator can produce effective visual stimulation. The data transmission method using the dynamic link library can satisfy the requirement of the system. Conclusions： The real-time signal processing method can improve signal-noise ratio and realize detection and recognization of visual evoked potential. The system can determine which module the subject was fixating and the result was feedback to the subject in real time.
出处
《中国医学物理学杂志》
CSCD
2010年第1期1638-1640,1644,共4页
Chinese Journal of Medical Physics
基金
国家自然科学基金项目(No.30300418)
重庆市科技攻关计划项目(CSTC
2009AC5023)
关键词
脑机接口
视觉诱发电位
动态链接库
信号处理
brain-computer interface
visual evoked potential
dynamic link Library（DLL）
signal processing
