Delsys portable EMG signal acquisition and human motion recognition design
This paper designs the front-end analog circuit to collect the surface EMG signals on the human arm and legs, and performs certain signal filtering, including low-pass and high-pass. After amplification, the A/D of the American delsys EMG processor realizes the analog-to-digital conversion, which is simple. Digital filtering, processing, drawing surface electromyography (sEMG) and simple methods of identifying a part of the human body through methods such as feature extraction and pattern recognition.
First, the program background
As one of the bioelectrical signals, the myoelectric signal is the root of the electrical signal that produces muscle power. It is the superposition of the action potentials of many motor units in time and space, which largely reflects the movement of nerves and muscles. status. From the point of view of the source of the myoelectric signal, there are generally two kinds, one is obtained by inserting the needle electrode into the muscle, that is, the needle type myoelectric signal, which has the advantages of small interference and easy identification, but causes harm to the human body; The electromyographic signal of the surface of the human skin, that is, the surface electromyography signal (sEMG), is obtained through the electrode sheet. This method is relatively simple and has no harm to the human body, and is commonly used. The surface EMG signal is collected in this design.
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 engineering, surface EMG signals can be used for patient treatment. In bionics, delsys surface EMG signals can be used for artificial prosthetic research.
Second, the overall design of the program
Figure 1 Scheme system block diagram
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.
Third, the program hardware design
Figure 2 System hardware part design block diagram
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.
Fourth, the software design flow chart
Figure 3 software design flow chart
V. Scheme physical map
Figure 4 Physical diagram of each module (including sensor, wireless reception)
On May 25th, 2017, the delsys EMG experience exchange meeting jointly hosted by American Delsys and Century Tianhong International Group was held in Shanghai Jiaotong University. The conference is free of charge, and you can submit a registration by scanning the QR code you want to register.
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