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Method for Recognizing Pressing Position and Shear Force Using Active Acoustic Sensing on Gel Plates.

Hiroki Watanabe1, Kaito Sasaki2, Tsutomu Terada2

  • 1Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan.

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PubMed
Summary

This study introduces a novel touch interface that detects both position and shear force using active acoustic sensing. This technology enhances touch interactions by analyzing ultrasonic wave propagation through a gel medium.

Keywords:
active acoustic sensingpressing position recognitionshear-force recognitiontouch interface

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Area of Science:

  • Human-computer interaction
  • Acoustic sensing technology
  • Material science

Background:

  • Current touch panels primarily detect contact position, limiting interaction capabilities.
  • Integrating shear force detection can enable more diverse and nuanced touch interactions.
  • Active acoustic sensing offers a potential method for multi-modal touch input.

Purpose of the Study:

  • To develop and evaluate a two-step recognition method for simultaneously detecting pressing position and shear force.
  • To leverage active acoustic sensing for enhanced touch interface functionality.
  • To assess the performance of the proposed method in a user-independent model.

Main Methods:

  • Utilized active acoustic sensing by transmitting ultrasonic sweep signals via a contact speaker and receiving waves with a contact microphone attached to a gel plate.
  • Analyzed changes in ultrasonic wave propagation characteristics resulting from user interactions (pressing and shearing) on the gel.
  • Developed a two-step recognition algorithm based on acoustic signal differences to identify position and shear force.

Main Results:

  • Achieved an F1 score of 85.4% for recognizing four distinct pressing positions.
  • Successfully recognized four shear-force directions with an F1 score of 69.4%.
  • Demonstrated the system's effectiveness in a user-independent evaluation.

Conclusions:

  • The proposed active acoustic sensing method enables simultaneous recognition of pressing position and shear force.
  • This technology significantly expands the possibilities for touch interactions beyond simple position detection.
  • The system shows promising performance for future touch interface applications.