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Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Related Experiment Video

Updated: Apr 21, 2026

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics
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Method for enhancing text entry rate with single-switch scanning.

Heidi Horstmann Koester1, Richard Callaghan Simpson

  • 1Koester Performance Research, Ann Arbor, MI;

Journal of Rehabilitation Research and Development
|October 31, 2014
PubMed
Summary
This summary is machine-generated.

This study optimized single-switch scanning settings, significantly boosting text entry rates for users. Communication speed improved by an average of 120%, enhancing assistive technology effectiveness.

Keywords:
alternative communicationassistive deviceassistive technologyaugmentative communicationcomputer accessphysical impairmentsingle-switch scanningswitch accesstext entryuser performance

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Area of Science:

  • Assistive Technology
  • Human-Computer Interaction
  • Augmentative and Alternative Communication (AAC)

Background:

  • Single-switch scanning is a vital communication method for individuals with disabilities.
  • Existing methods may present challenges in optimizing text entry rate (TER).
  • Enhancing TER is crucial for effective communication and user engagement.

Purpose of the Study:

  • To develop and evaluate a method for adjusting single-switch scanning interface settings.
  • To investigate the impact of optimized settings on user text entry rate.
  • To improve the efficiency of communication for single-switch scanning users.

Main Methods:

  • Developed a novel method for adjusting single-switch scanning interface parameters.
  • Recruited nine participants who utilize single-switch scanning for communication.
  • Evaluated the method by measuring text entry rate before and after setting adjustments.

Main Results:

  • Text entry rates (TER) improved by an average of 120% (p = 0.003).
  • All participants demonstrated at least a 40% increase in TER.
  • Five participants experienced over a 100% increase in TER, with average rates rising from 1.42 to 2.72 words per minute.

Conclusions:

  • The developed method effectively enhances text entry rate in single-switch scanning.
  • Optimized settings offer a significant improvement in communication efficiency for users.
  • This advancement holds potential for improving the quality of life for individuals relying on AAC.