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Distributed sources as a cause of abrupt amplitude decrease in cubic distortion-product otoacoustic emissions at high

Václav Vencovský1, Aleš Vetešník2, Ernst Dalhoff3

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Summary

Distortion-product otoacoustic emissions (DPOAEs) can show amplitude notches due to destructive interference. Simulations confirm this interference explains DPOAE notches and overshoots.

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Area of Science:

  • Auditory Neuroscience
  • Acoustics
  • Biophysics

Background:

  • Distortion-product otoacoustic emissions (DPOAEs) amplitudes can exhibit abrupt decreases at high stimulus levels.
  • These amplitude notches in DPOAE input/output functions suggest underlying complex acoustic phenomena.
  • Previous hypotheses attributed these notches to destructive interference of wavelets from distributed nonlinear distortion sources.

Purpose of the Study:

  • To investigate the cause of amplitude notches in DPOAEs.
  • To test the hypothesis that destructive interference underlies DPOAE notches and overshoots.
  • To provide a theoretical explanation for DPOAE notch phenomena using a cochlear model.

Main Methods:

  • Simulations using a smooth cochlear model.
  • Analytical solutions derived from the cochlear model.
  • Analysis of DPOAE input/output functions and distortion-product grams.

Main Results:

  • The simulations and analytical solutions support the destructive interference hypothesis.
  • Destructive interference between individual wavelets was shown to cause amplitude notches in DPOAEs.
  • The model successfully explained the onset and offset amplitude overshoots observed in DPOAE signals within the notch regions.

Conclusions:

  • Destructive interference of cochlear wavelets is a primary cause of DPOAE amplitude notches.
  • The findings provide a mechanistic explanation for DPOAE notches and associated amplitude overshoots.
  • This study advances the understanding of nonlinear cochlear mechanics and DPOAE generation.