As the root of the electrical signal that produces muscle power, the myoelectric signal is a kind of bioelectrical signal, and it is also a superposition of the action potentials of many motor units in time and space, which largely reflects the state of nerve and muscle movement. . From the source of the EMG signal, we can mainly divide into two types. One is: inserting the muscle through the needle electrode, that is, the needle electromyography signal. His advantage is that the interference is small and easy to recognize, but it will cause harm to the human body. Second, the electromyographic signal on the surface of the human skin, ie the surface electromyography signal (sEMG), is obtained through the electrode sheet. This method is relatively simple and has no harm to the human body. Century Tianhong (Century Tianhong International Group Co., Ltd.) is the general agent of Delsys Trigno Mobile portable surface EMG Greater China. This equipment has been widely used by various colleges and universities. The surface EMG signals are collected in this paper.
Delsys Trigno Mobile Portable Surface EMG
Organize your research survey with our non-fixed TrignoTM Personal Detector based on our parallel TrignoTM wireless sensor and fully integrated EMGworks acquisition and analysis software. This flexible system provides continuous storage for 16 Trigno sensors, with 3 degrees of freedom accelerometer data to operate the full bandwidth. Suitable for all outdoor and indoor use, this highly portable device allows you to experiment in the palm of your hand. In addition, the TrignoTM Personal Detector can process data in real time, connecting the wireless sensor to the USB port of the PC, making this product as a TrignoTM sensor connected to the desktop receiver of the lab.
Surface electromyography application
Surface EMG signals can be obtained from many parts of the body, such as calves, thighs, waist, back, neck, etc. The surface EMG signals obtained from different parts carry the movement and function information of the corresponding parts. For example, the myoelectric signal on the leg reflects the state of motion of the leg, such as walking, running, underarm, and the like. It is of great value to use surface EMG signals to study the state of motion of the human body. In medical rehabilitation projects, surface EMG signals can be used for patient treatment. In bionics, surface EMG signals can be used for artificial prosthetic research. 
As can be seen from the above design block diagram, the system design is mainly composed of five parts, of which filtering and amplification are the main part of the circuit design, because the work behind the surface EMG signal will not be possible. The signal conversion is mainly for A/D conversion work, and the signal representation is to draw the surface EMG.
The hardware design part is mainly four modules: analog signal module, microprocessor module, TFT display module and power module. The above figure has been marked with different colors.
Century Tianhong is the general agent of delsys full wireless surface electromyography test system in Greater China (Century Tianhong International Group Co., Ltd.) official website
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