移动终端信息的振动式触觉信号编码表征方法

Encoding and Characterizing Method of VibrotactileSignal for Information of Mobile Terminals

针对视听障碍群体无法通过触觉交互操作获取移动设备信息的问题,提出一种利用多感知强度的振动触觉信号对移动设备上的信息进行编码的方法,用于区分信息种类或内容.首先,通过测试感知阈值确定振动触觉信号的频率、持续时间和间隔的感知强度,并将信号调整到可接受的水平;其次,根据主观感知强度差异和编码组合方式提出等长编码和变长编码,用于信息的触觉编码传输;最后,通过信息理论对有限编码信息的识别结果进行评估.实验结果表明,该方法可提高信息触觉判定的正确率,且变长编码与等长编码相比具有更好的识别率和传输效率.

Aiming at the problem that people with audio-visual disabilities could not obtain the information of mobile devices through tactile interaction,we proposed a method to encode the information on mobile devices by using vibrotactile signals with multiple perceptual intensities,which was used to distinguish the types or contents of information.Firstly,the sensing intensity of the frequency,duration and interval of the vibrotactile signal were determined by testing the sensing threshold,and the signal was adjusted to an acceptable level.Secondly,according to the difference of subjective perception intensity and the encoding combination mode,equal-length code and variable-length code were proposed for the tactile coding transmission of information.Finally,the recognition results of limited coding information were evaluated by information theory.Experimental results show that this method can improve the accuracy of information tactile judgment,and the variable-length code has better recognition rate and transmission efficiency than the equal-length code.