振动触觉的量化感知与触觉文字编码设计

Understanding the Perception of Vibrations and Designing Tactile Reading on Smartphones

针对移动设备上实现触觉交互和触觉阅读文字的难题,提出一种触觉感知量化和编码模型,并设计了振动数量索引字符表和摩斯电码2种触觉文字编码方案.该模型首先对振动触觉的振动时长、间隔时长、连续振动次数进行量化设计;然后通过实验测定用户对振动量化感知的数值;再对不同的振动时长和振动次数进行编码;最后组合不同的编码来表达文字.对编码文字的用户识别率及满意度的可用性评估实验的结果表明,通过对振动触觉进行量化感知设计和编码可以有效地提高触觉阅读效率,比传统基于盲文等的编码方案具有更高的阅读效率及更好的易用性;文中模型可在移动设备上设计触觉交互界面,实现高效的触觉文字阅读系统.

The design of tactile interaction and tactile reading on mobile phones presents a number of challenges. In this paper, we present a quantization and coding model of tactile perception for developing efficient tactile reading systems. The model first quantifies the duration, interval and number of vibrations and then measures the ability of the user to perceive vibrations in experiments;next, it combines different vibration intervals and number of vibrations into code patterns, and finally, the model encodes different patterns of vibrations into characters. Based on the model, two kinds of tactile text coding schemes, a character index table and Morse code, were implemented. The experimental results showed that high reading speeds and accuracy, and user satisfaction were achieved with the proposed tactile coding schemes. Compared to traditional coding schemes based on Braille, the two proposed coding schemes were more effective for tactile reading. The proposed tactile coding model can be used effectively to design tactile interfaces and implement efficient tactile reading systems on mobile devices.