In this paper, a new surface electromyography (sEMG) signal decomposition method based on spatial location is proposed for the high-density sEMG signals in dynamic muscle contraction. Firstly, according to the waveform correlation of each muscle motor units (MU) in each channel, the firing times are extracted, and then the firing times are classified by the spatial location of MU. The MU firing trains are finally obtained. The simulation results show that the accuracy rate of a single MU firing train after classification is more than 91.67%. For real sEMG signals, the accuracy rate to find a same MU by the "two source" method is over (88.3 ± 2.1)%. This paper provides a new idea for dynamic sEMG signal decomposition.
针对肌肉动态收缩情况下的高密度表面肌电(sEMG)信号，本文提出了一种基于空间位置的sEMG信号分解方法。首先，根据肌肉运动单元(MU)在各个通道上的波形相关性，提取发放时刻，然后利用肌肉MU的空间位置分类发放时刻，最后得到MU发放序列。仿真结果表明，分类后单个MU发放序列准确率大于91.67%。针对实际sEMG信号，通过“二源法”找到同一个MU发放序列的准确率达到（88.3 ± 2.1）%以上。本文为动态sEMG信号分解提供了一种新思路。.
Keywords: dynamic signal decomposition; motor unit; spatial location; surface electromyography.