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Chirp evoked otoacoustic emissions

J Neumann1, S Uppenkamp, B Kollmeier

  • 1Drittes Physikalisches Institut, Universität Göttingen, FRG.

Hearing Research
|September 1, 1994
PubMed
Summary

Chirp stimuli offer advantages over click stimuli for evoking transiently evoked otoacoustic emissions (TEOAE), providing better signal-to-noise ratios and frequency selectivity for audiological assessments.

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Area of Science:

  • Audiology
  • Otoacoustic Emissions
  • Signal Processing

Background:

  • Transiently evoked otoacoustic emissions (TEOAE) are crucial for hearing assessments.
  • Standard click stimuli have limitations in frequency specificity and energy delivery.

Purpose of the Study:

  • To compare the efficacy of chirp stimuli versus click stimuli for evoking TEOAE.
  • To investigate the impact of chirp properties on TEOAE generation in normal and impaired hearing.

Main Methods:

  • Development and application of short frequency sweeps (chirps) to evoke TEOAE.
  • Comparison of chirp stimuli with standard click stimuli in normal and hearing-impaired subjects.
  • Analysis of signal-to-noise ratio and frequency components of evoked TEOAE.

Main Results:

  • Chirp signals allow for stimulation of freely selectable frequency ranges and deliver more energy than click stimuli.
  • Wide-band chirp signals improve the signal-to-noise ratio for TEOAE compared to click stimulation.
  • Frequency-limited chirps evoke TEOAE with components within the stimulated range, independent of fine spectral structure.

Conclusions:

  • Chirp stimuli are a valuable tool for evoking TEOAE, offering enhanced frequency control and signal quality.
  • The findings suggest chirp stimuli are particularly useful for clinical audiological applications.
  • Chirp stimulation provides a more targeted approach to assessing cochlear function.

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