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JND-based Mobile Phone Optimal Vibration Frequency  

Lee, Bongwang (Department of Industrial Systems and Information Engineering, Korea University)
Park, Hyunho (Department of Industrial Systems and Information Engineering, Korea University)
Myung, Rohae (Department of Industrial Systems and Information Engineering, Korea University)
Publication Information
Journal of Korean Institute of Industrial Engineers / v.30, no.1, 2004 , pp. 27-35 More about this Journal
Abstract
A study was conducted to investigate an optimal vibration frequency for mobile phones with just noticeable difference(JND). The just noticeable difference, Weber's law, is the minimum amount by which stimulus intensity must be changed in order to produce a noticeable variation in sensory experience. In order to find the optimal vibration frequency, sixteen frequencies ranged from 24Hz to 603Hz were selected. Subjects then wereasked to differentiate a pair of vibration frequencies. For the analysis, the psychometric function to determine the optimal vibration frequency and the logistic regression to validate the determined frequency were used. The results show that the 2nd order polynomial equations were best fitted for the JND psychometric function and the optimal mobile phone vibrations were determined at 140Hz, 151 Hz, and 160Hz. With the ogive-shaped psychometric function developed by the logistic regression, the results of this study was validated that the determined vibration frequencies (140Hz, 151 Hz, and 160Hz) were optimal mobile phone vibration frequencies.
Keywords
just noticeable difference(JND); vibration frequency; psychometric function; logistic regression;
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