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Cochlear implant microphone location affects speech recognition in diffuse noise.

Elizabeth R Kolberg1, Sterling W Sheffield1, Timothy J Davis1

  • 1Department of Hearing and Speech Sciences, Vanderbilt University, Nashville, TN.

Journal of the American Academy of Audiology
|January 20, 2015
PubMed
Summary

The T-Mic location improved cochlear implant (CI) speech recognition in noise compared to the integrated behind-the-ear (BTE) microphone. This finding has implications for CI design and audiology clinical practice.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Speech-Language Pathology

Background:

  • Cochlear implants (CIs) improve hearing but recipients still struggle with speech understanding in noisy environments.
  • Improving signal-to-noise ratio in noise is crucial for CI users, with microphone location being a key factor.
  • Previous research on microphone location effects primarily focused on hearing aid users.

Purpose of the Study:

  • To measure the acoustic output of the T-Mic versus the integrated behind-the-ear (BTE) processor microphone for cochlear implant (CI) users.
  • To evaluate how CI processor microphone location affects speech recognition in semi-diffuse noise with varying speech source directions.

Main Methods:

  • A within-participant design compared performance across listening conditions in 11 adults with Advanced Bionics CIs.
  • Acoustic output was measured using a KEMAR mannequin for the T-Mic and BTE mic.
  • Speech recognition of TIMIT sentences was assessed in restaurant noise with speech originating from 0°, 90°, and 270°, comparing T-Mic and BTE mic performance.

Main Results:

  • The integrated BTE microphone showed approximately 5 dB attenuation for signals at 0° compared to 90° in the 1500-4500 Hz range.
  • The T-Mic exhibited consistent output for sound sources originating from 0° and 90°.
  • Microphone location significantly impacted speech recognition, with the T-Mic demonstrating superior performance for speech originating from the 0° azimuth.

Conclusions:

  • Findings suggest implications for future cochlear implant processor design regarding microphone placement.
  • Results indicate potential adjustments for microphone settings for current implant recipients.
  • The study provides insights for conducting advanced speech testing in clinical audiology settings.