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Related Experiment Videos

Real-ear polar patterns and aided directional sensitivity

T W Fortune1

  • 1Argosy Electronics, Eden Prairie, MN 55344, USA.

Journal of the American Academy of Audiology
|April 1, 1997
PubMed
Summary

Microphone depth in the ear canal impacts directional hearing measurements. These findings are crucial for understanding hearing aid directionality and speech perception.

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Area of Science:

  • Audiology
  • Acoustics
  • Bioacoustics

Background:

  • Directional hearing is crucial for speech understanding in noise.
  • In-the-ear (ITE) and completely-in-the-canal (CIC) hearing devices utilize directional microphones.
  • Accurate electroacoustic measurements of directionality are essential for device performance evaluation.

Purpose of the Study:

  • To investigate the effect of microphone placement depth within the ear canal on real-ear directional sensitivity patterns.
  • To determine if different microphone depths influence electroacoustic estimates of directionality.

Main Methods:

  • Real-ear measurements of directional sensitivity patterns were conducted on eight subjects.
  • Microphones were placed at different depths: in-the-ear (ITE) and completely-in-the-canal (CIC).
  • Conventional and extended versions of the Unidirectional Index (UI) and Directivity Index (DI) were used for analysis.

Main Results:

  • Microphone placement depth significantly affects directional sensitivity in a region-specific and frequency-specific manner.
  • Estimates of directional sensitivity varied based on assumptions about sound source locations, listener orientation, and perceptual abilities.
  • Depth-dependent effects were observed for both UI and DI measures.

Conclusions:

  • Microphone depth within the ear canal is a critical factor influencing electroacoustic measures of directionality.
  • Modified directional sensitivity estimates may be necessary for accurate real-ear measurements.
  • Understanding these depth-related effects is important for predicting localization and speech recognition performance in hearing aid users.

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