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Updated: Aug 12, 2025

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Verification of Estimated Output Signal-to-Noise Ratios From a Phase Inversion Technique Using a Simulated Hearing

Donghyeon Yun1, Yi Shen2, Jennifer J Lentz1

  • 1Department of Speech, Language and Hearing Sciences, Indiana University Bloomington.

American Journal of Audiology
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The phase inversion technique for measuring hearing aid output signal-to-noise ratio (SNR) shows variable accuracy. Its estimations can be inaccurate, especially with increased noise, requiring cautious use and further validation.

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Area of Science:

  • Audiology
  • Signal Processing
  • Acoustics

Background:

  • Digital hearing aids with wide dynamic range compression (WDRC) can alter speech signal-to-noise ratio (SNR).
  • A phase inversion technique exists to assess hearing aid output SNR.
  • Systematic validation of this technique is lacking.

Purpose of the Study:

  • To validate the accuracy of the phase inversion technique for estimating output SNR in hearing aids.
  • To assess the technique's performance under various noise conditions and hearing aid settings.

Main Methods:

  • A simulated hearing aid with multichannel WDRC was used.
  • Output SNRs were directly computed using shadow filtering.
  • Phase inversion technique estimates were compared against shadow filter results.
  • Simulated speech and babble noise were presented at varying input SNRs.
  • Tests included different audiograms, WDRC speeds, and additive noise levels.

Main Results:

  • The phase inversion technique demonstrated overestimation or underestimation of output SNR.
  • Estimation errors often correlated with temporal speech features like pauses.
  • Increased levels of simulated noise degraded the accuracy of SNR estimation.

Conclusions:

  • The accuracy of the phase inversion technique is condition-dependent.
  • The technique should be applied cautiously in hearing aid SNR assessment.
  • Further research is needed to fully establish the validity of the phase inversion technique.