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Related Experiment Video

Updated: Apr 14, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Published on: March 24, 2023

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Speech Intelligibility in Noise With a Single-Unit Cochlear Implant Audio Processor.

Wilhelm Wimmer1, Marco Caversaccio, Martin Kompis

  • 1*Artificial Hearing Research, ARTORG Center for Biomedical Engineering Research, and †Department of ENT, Head and Neck Surgery, Inselspital, University of Bern, Switzerland.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
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PubMed
Summary

The Rondo cochlear implant (CI) processor may hinder speech understanding in noise when worn further back. Users experienced worse signal-to-noise ratios, especially with noise from behind.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Speech-Language Pathology

Background:

  • The Rondo is a single-unit cochlear implant (CI) audio processor.
  • It shares components with the behind-the-ear Opus 2 processor.
  • Switching to Rondo shifts the microphone position towards the back of the head.

Purpose of the Study:

  • To investigate the impact of the Rondo's wearing position on speech intelligibility in noisy environments.
  • To compare the performance of the Rondo with its predecessor, the Opus 2.

Main Methods:

  • Speech intelligibility in noise was assessed in 12 experienced CI users.
  • The German adaptive Oldenburg sentence test was employed across 4 spatial configurations.
  • Physical and numerical models were utilized for comparative analysis.

Main Results:

  • No significant differences in speech intelligibility were observed when the signal was from the front, regardless of noise direction (frontal, ipsilateral, contralateral).
  • The Opus 2 processor yielded a significantly better signal-to-noise ratio (SNR) by 4.4 dB (p < 0.001) when noise originated from the rear.
  • Worse SNRs were recorded with Rondo processors positioned further back compared to those closer to the ear.

Conclusions:

  • CI users with receiver/stimulator implants positioned further back may face increased challenges in noisy situations.
  • The Rondo's microphone placement can influence speech intelligibility in complex acoustic environments.
  • Further research may be needed to optimize Rondo placement for diverse listening conditions.