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Acoustic factors affecting interaural level differences for cochlear-implant users.

Paul G Mayo1, Matthew J Goupell1

  • 1Department of Hearing and Speech Sciences, University of Maryland, College Park, Maryland 20742, USApaulmayo@umd.edu, goupell@umd.edu.

The Journal of the Acoustical Society of America
|May 4, 2020
PubMed
Summary
This summary is machine-generated.

Bilateral cochlear-implant microphone placement affects sound localization. At-the-canal placement offers better interaural level difference (ILD) functions for bilateral cochlear-implant (BICI) users compared to behind-the-ear placement.

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Area of Science:

  • Auditory Neuroscience
  • Acoustics
  • Biomedical Engineering

Background:

  • Bilateral cochlear-implant (BICI) users rely on interaural level differences (ILDs) for horizontal sound localization.
  • Acoustic phenomena like the acoustical bright spot, acoustic axis, and microphone porting alter ILD magnitude across frequencies and azimuths.

Purpose of the Study:

  • To investigate how different BICI microphone placements influence ILDs.
  • To analyze the impact of microphone placement on head-related transfer functions (HRTFs).

Main Methods:

  • Analysis of head-related transfer functions (HRTFs).
  • Comparison of ILD-azimuth functions for at-the-canal versus behind-the-ear BICI microphone placements.

Main Results:

  • At-the-canal BICI microphone placement yielded larger ILD-azimuth functions.
  • At-the-canal placement resulted in more monotonic ILD-azimuth functions compared to behind-the-ear placement.

Conclusions:

  • Microphone placement significantly impacts ILDs in BICI users.
  • At-the-canal placement may enhance sound localization capabilities for BICI users.
  • Findings have implications for optimizing clinical device fitting and improving auditory perception.