基于语音控制的智能假手系统

The system of intelligent prosthetic hand based on speech control

为了实现对假手的智能控制,文中提出一种基于语音控制的设计方案。语音识别系统接收发音人的语音命令,并将语音命令转换成主控系统能识别的数字信号。主控系统接收数字信号,同时根据命令向指关节发送数据驱动指关节伺服电机正向或反向转动。指关节转动的角度被指关节电位器转换成相应的电信号。主控系统将角度电信号转换成数字信号,并将此数字信号和命令初始数据比较,从而发出修正命令数据,驱动指关节伺服电机走到指定的位置。在抓握不同物品时,本系统中在每个指尖安装有高灵敏度的压力传感器以检测指尖的受力,确保物品既被抓牢又不被压坏,从而实现对假手的智能控制。

In order to realize the intelligent control of the prosthetic hand, this paper proposed a design based on speech control. Speech recognition system receives the user＇s voice command, and converts the voice command into digital signal which can be recognized by main control system. After receiving the digital signal, main control system will send data which can drive finger joint servo motor rotating forwardly or reversely, at the same time the angle data will be convert into electrical signal by finger joint potentiometer. Main control system will convert this electrical signal into digital signal, and compare this digital signal with original command data. Finally, main control system can get revised data, which can drive finger joint servo motor moving to the correct position. When needing to grasp the different objects, this system can detect the fingertip pressure by high sensitivity pressure sensors mounted at the fingertip, which can ensure the item is to be grasped and will not be crushed. Thus, the intelligent control of the prosthetic hand can be realized.