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A wearable fabric-based speech-generating device: system design and case demonstration.

Amanda Fleury1,2, Gloria Wu1, Tom Chau1,2

  • 1a Institute of Biomaterials & Biomedical Engineering , University of Toronto , Toronto , Canada.

Disability and Rehabilitation. Assistive Technology
|May 29, 2018
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Summary

This study developed a wearable speech generating device (SGD) using conductive fabrics for a child with vision impairment. The fabric-based SGD increased communication interactions and unprompted initiation, offering a comfortable and accessible alternative.

Keywords:
Speech generating device (SGD)assistive technologyaugmentative and alternative communication (AAC)electronic textilefabric-based switchwearable technology

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Area of Science:

  • Rehabilitation Engineering
  • Assistive Technology
  • Human-Computer Interaction

Background:

  • Conventional speech generating devices (SGDs) often require caregiver assistance, limiting spontaneous social interactions.
  • Conductive fabrics offer potential for creating wearable SGDs that are persistently available.
  • Pediatric users, especially those with vision impairment, can benefit from more accessible and integrated communication tools.

Purpose of the Study:

  • To design and evaluate a wearable SGD utilizing resistive textile-based switches for a nonverbal pediatric participant with vision impairment.
  • To compare the usability and effectiveness of a fabric-based SGD against a participant's current device.

Main Methods:

  • Developed quad-key fabric keypads using conductive fabrics and insulating materials.
  • Selected the optimal keypad design based on activation force, repeatability, and cross-talk.
  • Implemented the chosen keypad into a wrist-worn, four-message textile SGD for a pediatric user over two one-week periods, alternating with their existing device.

Main Results:

  • The optimal fabric keypad comprised two layers of woven conductive fabrics and one layer of insulating felt with 10mm apertures.
  • The fabric-based SGD led to increased communicative interactions, particularly in school settings, and facilitated unprompted communication initiation.
  • The participant preferred the fabric-based SGD for its wearability and aesthetic appeal, though parents noted intelligibility concerns compared to a tablet-based device.

Conclusions:

  • Fabric-based SGDs represent a novel alternative to traditional rigid electronic devices, offering advantages in tactile differentiation, wearability, and personalization for pediatric users.
  • The developed fabric keypad design is suitable for pediatric use, requiring low-force activation and exhibiting minimal cross-talk.
  • Wearable, persistently available textile SGDs hold promise for enhancing communication opportunities, especially for individuals with vision impairments.