中文摘要：

目的：设计与实现触觉替代视觉系统（TVSS），该系统尝试通过电极阵列刺激皮肤产生触觉感受，并利用触点的二维分布，为盲人开辟一条重获视觉信息的新途径。方法：系统由三个模块组成：多通道电触觉阵列，电极驱动电路以及嵌入式控制图像处理模块。其中256通道的电触觉阵列通过将球形镍电极焊接到印刷电路板上的方式制作而成。采用多路分时技术为多通道提供高压电脉冲刺激信号，通过光电隔离电路实现强弱电信号之间的隔离与控制。使用DM642开发板来实现图像的获取、处理以及传输功能。结果：手指尖电脉冲刺激的阈值在130V左右。结论：不同的刺激脉冲宽度，会引起刺激阈值以及刺激效果的变化，150V以上的电脉冲会在指尖产生一个局部的舒适的电触觉感受。

英文摘要：

objective： To design and implement a tactile vision substitution system （TVSS）. The system intends to stimulate the skin with electrode array so that the blind will have a tactile perception. This paves a new road for the blind to regain visual information through the two-dimensional distribution of electro-tactile stimulation. Methods： The multi-channel TVSS consists of three modules： Electro-tactile electrode array, Electrode drive circuit and Embedded control image processing module. The electrode array of 256 channels is made by welding spherical nickel electrodes to the printed circuit board. By using the multiplexing technology can we provide the 256-channel electrode array with high-voltage pulse stimulation, and the optoelectronic isolation circuit serves as isolator and controller between strong current and weak current signal. The DM642 development tools can help to achieve the functions of the acquisition, processing and transmission of the images. After building up the system, we carry out some preliminary experiments. Results： The threshold of the high voltage stimulation on the fingertips is more than 130 V. Conclusions： The width of the pulse could cause the change of threshold and effect of the stimulation. More than 150V could cause a comfortable and local electrical touch.