Real-time Embedded Systems Based Eeg Acquisition Instrument Design

With the rapid development of electric and computer technology in recent years, the foundation of EEG processing has been built. And the research on Brain Computer Interface (BCI) also becomes a hot item.BCI is a direct data communication channel that transmits information from a human brain to a computer or other electronic equipments, which mainly implicat in medical care and other human behavior assistant. In the realization of BCI, EEG amplifier whose precision decides the performance of BCI is the most important part. Now there are many types of EEG equipment that excellent in both precision and anti-jamming performance. They meet the need of medical and healthcare well. But for the research of laboratory it is not enough, we hope that it could provide us a platform that we can develop upon. Thus we can do some special experiments with it.In order to fulfill our own research requirements, we design EEG sampling equipment that based on embedded computer system. The functions of this equipment are mainly EEG recording, pre-processing, and translating the data to PC in USB mode. In this paper, the design and realization of hardware and software of this EEG equipment are presented.1) First, in this article, we build an EEG source model, and discuss the method of EEG recording. We also present some different ways of designing an amplifier. In addition, as the EEG signals are very weak, they are very easy to be affected by noises and disturbances. So based on the research of other experts, we bring forward many measures of anti-jamming, especially the right-leg drive mode.2) One of the most important characteristics of our EEG equipment is that we make the evoked potentials (EP) easily to be recorded. When we do the EP experiment, the equipment monitors the evoking signals, and groups it with EEG data. So the PC could find the EEG datas that marked by evoking signals.We could get useful information through the way of averaging filter technicality.3) Then, we design the hardware of this equipment including control board and...