Design of low-noise multi-channel active surface electromyography acquisition equipment

The vast majority of sEMG acquisition systems use wired transmission, which makes the signal highly susceptible to power-frequency interference. In addition, the sEMG signal is relatively weak, and preprocessing such as amplification, filtering, and denoising is crucial. In this paper, a low-noise and high-precision multi-channel active surface electromyography acquisition device that supports up to 16 channels of acquisition is designed and developed, which is used to collect muscle signals of various upper limb movements. The system uses active electrodes to achieve a higher signal-to-noise ratio (SNR), which can be improved by 64.04% compared to passive electrodes. And the integrated functions of active electrode array drive, weak signal acquisition and right leg drive create hardware conditions for the subsequent research on surface EMG signal processing.