摘要
心电和脑电是反映一个人生理特征的两个重要指标,通过采集一个人的心电信号和脑电信号,可以判别他的情绪和生理的变化,进而分析不同情况下决策的变化。本文设计并开发了一套多路并行测量人体心电和脑电信号的仪器,主要完成了信号的采集、滤波、放大,以及AD转换,并通过蓝牙传输模块,将数据传输至电脑,最后在电脑上显示所采集的信号。本系统主要有心电脑电信号采集模块和信号传输模块,信号采集模块以ADS1198为核心,主要完成信号的采集、滤波、放大和AD转换功能。信号传输模块由MC9S12XS128单片机和蓝牙模块组成,主要完成数据的传输功能。本文采用了陷波滤波器的方法消除了50 Hz工频干扰,加入前端放大模块,增加了系统的放大倍数,同时,借助采样定律计算得出了合适的采样频率,以保证采样的快速和准确。本文设计的仪器,通过电极直接接触人体,能够多路并行采集人体的心电和脑电信号,采样结果通过蓝牙模块传输至电脑,在电脑端直接显示所采集到的人体信号,采集结果快速准确,在系统正常工作情况下,整个系统的电流维持在50 m A^65 m A,功耗低,采用1600 m Ah的锂电池完全可以满足大规模试验的功耗要求。这种仪器的主要特点是占用空间小,功耗低,多路并行,便于大规模实验。经测试成功后投入实验使用,并取得了良好的效果。
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 multi- channel. 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 ADSl198, 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 eonveuience for large-scale experiments. After a successful test, this equipment has been putted into experimental application, achieving good results.
出处
《中国医学物理学杂志》
CSCD
2015年第3期407-411,共5页
Chinese Journal of Medical Physics
