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Related Experiment Videos

Directivity quantification in hearing aids: fitting and measurement effects.

T Ricketts1

  • 1Dan Maddox Hearing Aid Research Laboratory, Vanderbilt Bill Wilkerson Center, Nashville, TN 37212, USA.

Ear and Hearing
|March 9, 2000
PubMed
Summary
This summary is machine-generated.

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Directivity of directional hearing aids varied significantly, and was impacted by venting and microphone port orientation. Manufacturer specifications may not reflect actual performance, highlighting the need for careful fitting for hearing-impaired listeners.

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Aid Technology

Background:

  • Directional hearing aids aim to improve speech understanding in noise by focusing on sound sources.
  • Understanding the factors influencing hearing aid directivity is crucial for effective hearing rehabilitation.

Purpose of the Study:

  • To assess how venting, microphone port orientation, and compression affect the directivity of behind-the-ear hearing aids.
  • To compare the directivity of commercial hearing aids with the natural directivity of the open ear.

Main Methods:

  • Electroacoustic evaluation of directivity using polar patterns and directivity index calculations.
  • Measurements were conducted across various venting configurations and microphone port angles.
  • Hearing aids were tested in both directional and omnidirectional modes, with and without compression.

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Main Results:

  • The open ear exhibited superior directivity compared to omnidirectional hearing aids.
  • Directional hearing aids showed better directivity than omnidirectional ones, but with significant variability across brands and models.
  • Venting and microphone port orientation demonstrably influenced measured directivity.

Conclusions:

  • Variability in directivity across directional hearing aid brands suggests manufacturer specifications may not always predict individual instrument performance.
  • Venting and microphone port orientation are critical factors that must be considered during the fitting of directional hearing aids.
  • Compression, under specific assumptions, did not appear to alter hearing aid directivity.