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Development and Evaluation of a Low-Cost Open-Source Nasometer.

Liwei Wang1,2, Alessia Romani1, Scott Adams3

  • 1Department of Electrical and Computer Engineering, Western University, London, ON N6A 3K7, Canada.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary

A new low-cost, open-source mobile nasometer (mNasometer) shows promising agreement with commercial devices for measuring nasalance, a key indicator in speech disorders. This affordable and portable tool could expand clinical and research applications in speech assessment.

Keywords:
3D printingaudio signal processingmobile devicenasalanceopen sourcespeech analysis

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Area of Science:

  • Speech-language pathology
  • Biomedical engineering
  • Acoustics

Background:

  • Hypernasality impacts speech intelligibility and quality, often assessed using nasometry.
  • Existing commercial nasometers are expensive and lack portability, limiting accessibility.
  • There is a need for cost-effective and portable solutions for nasalance measurement.

Purpose of the Study:

  • To design and construct a low-cost, open-source mobile nasometer (mNasometer).
  • To evaluate the electroacoustic and subjective performance of the mNasometer against a gold-standard commercial device.
  • To assess the potential of the mNasometer for broader research and field applications.

Main Methods:

  • Development of the mNasometer using 3D printing, accessible electronics, and a custom mobile application.
  • Electroacoustic analysis comparing long-term averaged spectra and oral/nasal acoustic isolation.
  • Nasalance data collection from ten healthy adults using both mNasometer and a commercial device during speech tasks.

Main Results:

  • Long-term averaged spectra showed comparable profiles between the mNasometer and the commercial device.
  • The mNasometer exhibited reduced acoustic isolation but yielded nasalance scores with similar trends to the commercial system.
  • Significant correlations were found between nasalance measures from both devices across most speech tasks.

Conclusions:

  • The low-cost, open-source mNasometer prototype demonstrates promising agreement with a gold-standard commercial nasometer.
  • The mNasometer's affordability and portability offer potential for expanded use in objective nasalance assessment.
  • This device could enhance research and field-based speech disorder evaluations, particularly in resource-limited settings.