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针对人体表皮脑电信号特点提出了基于MCU与虚拟仪器的脑电信号采集系统。采用生物电信号前置放大电路、滤波电路、50Hz工频陷波电路、电平抬升电路有效滤除信号噪声并放大脑电信号,同时采用MSP430MCU高速采样技术和串口通信技术并结合LabVIEW开发上位机软件低成本地完成对脑电信号的数字化采集和实时波形显示。系统仿真和实验表明,系统能够有效地实时采集人体生物电信号,为脑机接口研究提供支持。
According to the characteristics of human epidermal EEG signal, a brain electrical signal acquisition system based on MCU and virtual instrument is proposed. Using bioelectric signal preamplifier circuit, filter circuit, 50Hz power frequency trap circuit, the level up circuit effectively filter out signal noise and amplify the EEG signal, using MSP430MCU high-speed sampling technology and serial communication technology combined with LabVIEW development PC Software to complete the digital acquisition of EEG signals and real-time waveform display at low cost. The system simulation and experiment show that the system can effectively collect bioelectric signals in real time and provide support for the research of brain-computer interface.