Wireless EEG monitoring system

• Main Author: Lu, Yuncheng
• Other Authors: Goh Wang Ling
• Format: Theses and Dissertations
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/76015
• Institution: Nanyang Technological University

Human medical data collection system, especially patient monitoring system is always a challenge for designers. The system should be able to extract weak electric signal from strong common-mode voltage and noise. Besides, conventional electroencephalogram (EEG) monitoring systems are usually bulky, expensive and power hungry, which is not convenient for family use. Therefore, in this project, a portable wireless monitoring device with high common-mode rejection ratio (CMRR) analog-end and high digital resolution is designed. The device mainly contains two parts: the front-end (i.e. analog part) and the back-end (i.e. digital part). The analog part is made up of high CMRR amplifiers, precision operational amplifier and low-pass filter; the digital part mainly assembles the Analog-to-Digital Converter (ADC) and Bluetooth transmission module. The analog electric signal from electrodes can be amplified about 600 times by amplifiers, then the bandwidth is filtered to range 20 – 500 Hz. After being biased, the signal is sampled and converted by SAR ADC and then sent to PC or mobile equipment through Bluetooth module. Finally, the signal received will be observed and analyzed on LabVIEW. The performance of the entire system has been tested by amounts of simulations and analyses from design-stage to testing-stage. The experimental results show that the EEG signal can be detected and processed accurately by this wireless EEG monitoring system. Besides, the device can also be used to detect electrocardiogram (ECG) and electromyogram (EMG) signal.