孙媛媛 王志亮

摘  要： 为了帮助视觉残疾者独立行走，提出面向视觉残疾者的室内空间无障碍助行系统设计方法。室内空间与设施助行系统设计包括合理的空间、简化的流线、铺地引导与盲道、连续的扶手。根据无障碍电子助行系统整体功能，以TMS320DM642为核心，设计视频解码器，利用视频解码芯片TVP5150PBS对接收到的空间图像信息进行解码，使结果以数字信号形式输出。采用型号为TLV320AIC23BPW的音频处理芯片设计音频处理器，将该芯片与DM642端口相连接，可完成系统音频高效导入。根据软件程序加載流程，设计数字信号处理模块图像声音映射方案，达到图像与音频之间有效转换的目的，实现室内空间无障碍电子助行系统设计。由实验结果可知，该系统最高助行效率可达到87%，可有效帮助视觉残疾者独立行走。

关键词： 视觉残疾者; 室内空间; 无障碍电子助行系统; 数字信号处理; 映射方案; TMS320DM642

中图分类号： TN79?34; TP391.4                   文献标识码： A                     文章编号： 1004?373X（2019）09?0167?05

Design of barrier?free walking?aided system for visually?impaired person in interior space

SUN Yuanyuan1， WANG Zhiliang2

（1. Tianping College of Suzhou University of Science and Technology， Suzhou 215011， China;

2. School of Information Science and Technology， Nantong University， Nantong 226019， China）

Abstract： An barrier?free walking?aided system design method for visually?impaired person in interior space is proposed to help the visually?impaired person to walk independently. The design of interior space and walking?aided system includes reasonable space， simplified streamline， paving guide and blind path， and continuous handrail. According to the overall function of the electronic walking?aided system， the video decoder taking TMS320DM642 as its core is designed， and the video decoding chip TVP5150PBS is used to decode the received spatial image information and make the results be output in the form of digital signal. The audio processing chip TLV320AIC23BPW is used to design the audio processor， and connected with the port of DM64 to realize the efficient import of system audio frequency signal. According to the loading process of software program， the image?sound mapping scheme of the digital signal processing module is designed to achieve the effective conversion between the image and audio frequency signal， and realize the design of the barrier?free electronic walking?aided system in interior space. The experimental results show that the maximum walking?aided efficiency of the system can reach up to 87%， and the system can effectively help the visually?impaired person to walk independently.

Keywords： visually?impaired person; interior space; barrier?free electronic walking?aided system; digital signal processing; mapping scheme; TMS320DM642

0  引  言

随着人口数量的增长和智能手机等电子设备的推广，视觉残疾者这个特殊人群的数量不断增加。据统计，我国视觉残疾患病率达到94%，其中大部分人具有基本的生活、工作和参与社会活动的能力。人们获取信息的主要来源是视觉，约占90%，失去视觉意味着失去了获取信息的主要途径，因此视觉残疾者在生活中会遇到很多困难[1]。通过在室内空间设置无障碍设施，可以大大延伸视觉残疾者的活动范围，减少生活和工作障碍，获取与正常人同等社会生活的权力。……