Design and implementation of multi-channel portable equipment for ECG and EEG acquisition
ECG and EEG are two important indicators to reflect a person's physiological characteristics.The emotional and physical changes of a person can be distinguished by analyzing his ECG and EEG,and then the decisions will change for different conditions.This paper designed and developed a kind of portable equipment measuring ECG and EEG by multichannel.This equipment mainly accomplished the signal acquisition,filtering,amplification,and AD conversion.The results would be transferred through the Bluetooth module,and the signals acquired would be displayed on the computer finally.This system mainly consisted of two parts,signal acquisition module and signal transmission module.The signal acquisition module was based on ADS 1198,mainly accomplishing the signal acquisition,filtering,amplification and AD conversion.The signal transmission module consisted of MC9S12XS128 single chip microcomputerand Bluetooth,and the main function of this module was data transmission.In this paper,a notch filter was applied to eliminate the 50 Hz frequency interference.Besides,a front-end amplifier module was added to increase the magnification times of the system.Meanwhile,the appropriate frequency was calculated by the sampling theorem to ensure fast and accurate sampling.This equipment could collect EEG and ECG with multi-channel by directly contacting the human body.The sampling results were transmitted to the computer via the Bluetooth module.The data,collected quickly and accurately,would be directly displayed on the computer.When the system was work normally,the system had low power consumption and the current of the whole system maintains at 50 mA-65 mA,so 1600 mAh battery could fully meet the power requirement of large-scale trials.The main features of this equipment are small footprint,low power consumption,multi-channel and the convenience for large-scale experiments.After a successful test,this equipment has been putted into experimental application,achieving good results.
NETL
NSTL
万方数据
维普
