The Design Of Wireless EEG Acquisition System By Group

EEG acquisition is an important basic part of research for brain science.This paper presents a wireless EEG acquisition system that can be used to collected EEG of several people at the same time.The system consists of a number of identical EEG acquisition devices,the wireless local area network(WLAN)connects multiple EEG acquisition devices to achieve the simultaneous acquisition of EEG on a computer.The efficiency of EEG collection promotes the development of brain science.Each of the EEG acquisition device with STM32 as the main controller has 8 channel,using WIFI,USB two kinds of communication.The hardware part mainly discusses the design of the system amplification,filter circuit,impedance detection and active electrode,also introduced the digital interface,supply circuit of power,battery management and so on.In order to ensure safety of the human body,all external interfaces of the system are electrically isolated.The part of software includes the design of the firmware program,acquisition and analysis software.The part of firmware program design mainly describes the process and structure of the program,WIFI interface,USB interface,data acquisition of ADC,data cache(FIFO).The part of acquisition and analysis software introduces the communication of the device,search and management of the device,the data reception,the detecting of impedance,event tagging,storage and display of data.The performance of the system is tested,and we verified the system by the ERP experiment,it is meet for us.The characteristics of the wireless EEG using by group is safety,portability,energy saving,high ratio of signal-to-noise,stable performance,low cost and so on.At present,the system has been used for the EEG data acquisition,and it is working stably.