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Cochlear implant speech processor placement and compression effects on sound sensitivity and interaural level

Todd Ricketts1, D Wesley Grantham, Patrick D'Haese

  • 1Department of Hearing and Speech Sciences, Vanderbilt Bill Wilkerson Center, USA. todd.a.ricketts@vanderbilt.edu

Journal of the American Academy of Audiology
|April 28, 2006
PubMed
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Cochlear implant (CI) processor placement affects microphone output, but front-end compression can help. This compression impacts sound localization cues for bilateral CI users, with varied results in pilot studies.

Area of Science:

  • Audiology and Hearing Science
  • Biomedical Engineering
  • Speech and Hearing Sciences

Background:

  • Cochlear implant (CI) speech processor placement is crucial for audibility.
  • Front-end compression is a common signal processing strategy in CIs.
  • Understanding the acoustic impact of CI placement and compression is vital for optimizing hearing outcomes.

Purpose of the Study:

  • To assess the effect of common cochlear implant (CI) speech processor placements on microphone output.
  • To evaluate the impact of single-channel front-end compression on microphone output and interaural level difference (ILD) magnitude.
  • To collect preliminary sound localization data in bilateral CI users with and without front-end compression.

Main Methods:

  • Microphone output was measured for ear-level, shoulder, and collar CI speech processor placements.

Related Experiment Videos

  • Single-channel front-end compression was applied and its effect on microphone output and ILD was analyzed.
  • Sound localization abilities were tested in seven bilateral CI recipients under conditions with and without compression.

    • Main Results:

    • Differences in signal audibility caused by CI processor placement were partially compensated by front-end compression.
    • Front-end compression significantly affected interaural level difference (ILD) cues.
    • Preliminary localization data showed that some bilateral CI users benefited from ILD cues when compression was off, while others did not show improved localization.

    Conclusions:

    • Front-end compression can mitigate audibility issues arising from different CI speech processor placements.
    • The use of compression alters ILD cues, which are important for sound localization.
    • Individual differences exist in bilateral CI users' ability to utilize altered ILD cues for localization, suggesting personalized fitting strategies may be necessary.