| In recent years, Electroencephalograph (EEG) technology becomes increasingly widely used, and old brainwave machines were continuously weeded out to bring for new ones while unfortunately it is far from known in our homeland. For this reason, I decided to start a project on EEG signal acquiring. The aim of this project was to develop a wearable battery-powered 2-channel brainwave telemetry recording system, which is able to detect EEG signal produced by human brain by attaching electrodes to scalp, convert the analog signal to digital data stream after amplifying and filtering, and over radio frequency transmit it to a home PC for recording, analyzing and monitoring. It can also be used as a standalone EEG recorder, whose data is stored in Flash Memory in real time and read out off line by a home PC. By using new generation chips such as instrumentation amplifier, CSoC, flash memory, monolithic RF transceiver the system may be implemented in a wearable device. Now a prototype EEG telemetry system has successfully been made, and passed fundamental test. The result suggests that its main performance specifications are comparable to that of popular ones oversea. Based on this front end, further development could lead to useful instruments in the following area: physiology or psychology researching, EEG biofeedback, teaching demonstration, clinical monitoring, virtual reality, brain computer interface etc. This thesis describes the system's design and implementation in detail. |
