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Title:: Design and analysis of dual channel surface electromyography acquisition equipment

Author(s):: DAI Jigao1; XU Xiulin1; WU Xi2; 1.School of Medical Instrument and Food Engineering，University of Shanghai for Science and Technology，Shanghai 200082，China;2.Changhai Hospital of Shanghai,Shanghai 200433

Keywords:: Surface electromyography; Original signal acquisition; Signal to noise ratio; Hardware filtering; Signal interference processing

摘要:: 本研究设计了一种双通道的表面肌电信号（surface electromyography，sEMG）采集装置。该装置以STM32为主控芯片,配以sEMG采集模块，实现对肌电信号的采集，并将数据传至由MATLAB编程的上位机进行分析处理。该装置对于人体内部及周围环境干扰噪声的处理均在硬件上实现,信噪比约为60~70 dB。将本装置与Noraxon-DTS系列无线sEMG采集装置采集的肌电信号进行比对,结果表明，该装置能更好地滤除50 Hz的工频干扰；当受试者做屈肘动作时，肱二头肌的频谱信号与Noraxon装置的测试结果一致，表明该装置能高精度地采集sEMG，且具有很强的抗干扰能力。

Abstract:: Used STM32 as the main control chip,we designed a dual channel surface electromyography(sEMG) signal acquisition device. The equipment used STM32 as the main control chip and sEMG acquisition module to achieve the acquisition of original EMG signal and transmit the data to the upper computer complied by MATLAB for analysis and processing. It dealt with the interference noise of human body and surrounding environment completely in hardware, the signal-to-noise ratio(SNR) was about 60~70 dB. Compared with Noraxon-DTS series wireless sEMG acquisition system, the experiment results showed that the equipment could further filter out 50 Hz power frequency interference,the signal spectrum of biceps brachii was equivalent to that of Noraxon’s device when subjects do elbow flexion.The device can acquire sEMG signal with high precision and has strong anti-interference ability.