JND-based Mobile Phone Optimal Vibration Frequency

JND를 이용한 휴대폰의 최적 진동 주파수 설계

  • 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)
  • 이봉왕 (고려대학교 공과대학교 산업시스템정보공학과) ;
  • 박현호 (고려대학교 공과대학교 산업시스템정보공학과) ;
  • 명노해 (고려대학교 공과대학교 산업시스템정보공학과)
  • Published : 2004.03.31

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

References

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