Design and implementation of a wireless multi-channel EEG recording

This paper describes the implementation of a multi-channel wireless EEG (Electroencephalogram) device to acquire and record EEG signals from the brain. Improvements to existing EEG devices include a greater number of channels whilst remaining portable, extending the range of wireless transmission to improve mobility and a reliable method of construction. An analogue circuit comprising of novel filters specifically designed for the proposed EEG system and gain amplifiers were designed to filter the noise components and to amplify the EEG signal to the order required for digital processing. The MSP430 Microcontroller forms the core of the digital board and allows quantization of the received analogue signal and further digital filtering to remove line interference. By employing a Bluetooth module, the quantized data is transmitted wirelessly to the end device thus providing anti-interference capability by eliminating distortion which often occurs with wired connections due to other AC devices within proximity of the EEG device. Wireless connection between patients and equipment also allows greater mobility by eliminating the physical constraints imposed by cables as well as making monitoring more convenient.