Design of Wireless Synchronous sEMG Information Acquisition System

The sEMG (surface electromyogram signal) reflects the degree of muscle activity, which contains a large amount of motion information about the human body. It has important research significance and application value in sports science, rehabilitation medicine, and so on. There are more and more products related to sEMG acquisition, which are mainly divided into wired and wireless. Compared with wired sEMG acquisition equipment, wireless sEMG acquisition equipment can free the subjects from the shackles of connecting lines and space, so it is more concerned by researchers. However, due to the independence among the wireless acquisition modules, synchronization time errors between each module inevitably occur, which will bring difficulties to the subsequent data analysis. To solve this problem, a synchronized four-channel sEMG data acquisition system is designed in this paper. The experimental results show that the synchronization time errors among the 7 modules are almost controlled below 30 us, which are better than similar products in the market (about 300 us), and it has high SNR (Signal Noise Ratio), so the effective data collected can be used for sEMG signal analysis and processing.