A wireless system for multi-channel transmission of EEG Signals
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A miniaturized wireless data acquisition and real-time signal analysis system for monitoring and analysis multi-channel EEG signal is presented. The system includes: multi-channel EEG probes, second order 60Hz band-stop filters, instrumental differential amplifiers with 100dB CMRR, 12bit resolution analog to digital converters, low power consumption microcontrollers, Zigbee wireless point to point communication modules, serial port communication module, graphic user interface software and digital signal processing toolbox. Key performance includes: long range communication (50 meters), miniaturized transmitter unit (40mm*40mm*10mm), high ADC sampling rate (400 samples/channel/second) and low power consumption of the transmitter unit in working mode (40mW). Spectrum measurement of the filter and 8 channel real-time wireless data transmission test are applied on this system. By implement the miniaturized transmitter unit on the EEG probes, the cumbersome cable could be removed. Applications related in medical research and commercial products could be explored based on this wireless brain signal acquisition system, such as brain controlled games and disease diagnose.