32通道无线表面肌电和加速度信号采集系统设计

Design of 32-Channel Wireless Surface Electromyography and Acceleration Signals Acquisition System

为满足对表面肌电信号采集系统的无创、便携和大数据量传输的需求,本文实现了基于蓝牙无线传输协议的32通道表面肌电和加速度信号采集系统。该系统由发送端和接收端组成。发送端包括4组8通道信号采集和发送模块,每组完成对5通道表面肌电和一个3轴加速度信号的采集、处理及发送;接收端采用FPGA管理4组蓝牙接收器进行一对一数据接收,同时对数据进行统一打包处理并发送到PC机进行数据存储、数据处理及信号波形显示。测试结果表明,本系统一次充电可持续工作6 h,无线通信距离可达12 m,信号噪声比高于70 dB。基于以上性能参数,本系统可应用于手势识别、健康监护等科学研究领域。

In order to meet demands for non-invasion,portability and Large amount of data transmission of surface elec- sEMG and acceleration signal acquisition system based on Bluetooth wireless transmission protocol is presented in this paper. This system consists of both transmitting and receiving terminals. The transmitting terminal composed of 4 groups of 8-channel signal acquisition and transmission modules. Each transmission modtde enables simultaneous acquisition, processing and transmission of 5-channel sEMG and 3-axis acceleration signals. The receiving terminal uses FPGA to integrate 4 Bluetooth receivers, receiving data from 4 transmission modules respectively. The receiving terminal subsequently packs all received data and transmit them to the computer for storing, processing, and displaying. This system can work 6 hours by a single charge. The wireless communication distance of the system can reach up to 12 meters with a signal to noise ratio no less than 70 dB. Based on these performance parameters,the proposed sEMG and acceleration signal acquisition system is suitable for a variety of applications in gesture recognition and health care.