Minimal Invasive Headband for Brain Computer Interfacing and Analysis

An electroencephalogram (EEG) instrument has been successfully developed and tested for capturing, visualizing and recording brain activity using both active and passive electrodes. The key idea is to capture a noise free composite brain wave and separate out its constituent components, namely delta, theta, alpha, beta and gamma. The system consists of three functional parts including EEG signal capturing, Digitizing and wireless transmission and PC end software for visualizing and post processing. EEG signal capturing part consists of electrodes, amplification circuit for each channel and Right Leg Driver circuit to eliminate 50 Hz power line noise. The digital band pass filters and the 50 Hz notch filter which confiscates any residual noise components are built in the PC software. Battery power and wireless communication gives the sovereignty to the user to move around with the system while being monitored. The test results showed that system could meet the demands in researching various kinds of EEG related experiments in laboratory.