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Sensitivity-Enhanced Wearable Active Voiceprint Sensor Based on Cellular Polypropylene Piezoelectret.

Wenbo Li1, Sheng Zhao1, Nan Wu1

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology , Wuhan 430074, China.

ACS Applied Materials & Interfaces
|June 15, 2017
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Summary

This study developed a wearable voiceprint sensor using cellular polypropylene piezoelectret material. The enhanced sensor offers high sensitivity for accurate voiceprint recognition in security systems.

Keywords:
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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Wearable active sensors are crucial for mobile biosensing and human-machine interaction.
  • Key requirements for these sensors include flexibility, high sensitivity, stability, and self-powering capabilities.

Purpose of the Study:

  • To develop a sensitivity-enhanced wearable active voiceprint sensor (SWAVS) for voiceprint recognition.
  • To utilize cellular polypropylene (PP) piezoelectret as the core material for improved sensor performance.

Main Methods:

  • Employing a dipole orientation control method to optimize air layer utilization in the PP piezoelectret.
  • Integrating the enhanced piezoelectret into a wearable active voiceprint sensor design.

Main Results:

  • Achieved a significant enhancement in current sensitivity from 1.98 pA/Hz to 5.81 pA/Hz at 115 dB.
  • Demonstrated superior sensitivity, accurate frequency response, and excellent stability in the SWAVS.
  • Successfully implemented a voiceprint recognition system capable of identifying both password and speaker.

Conclusions:

  • The developed SWAVS shows potential for noncontact biometric recognition and safety systems.
  • This advancement contributes to the progress of wearable sensor networks and human-machine interfaces.