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Frequency characteristics and speech recognition in cartilage conduction.

Tadashi Nishimura1, Ryosuke Miyamae1, Hiroshi Hosoi2

  • 1Department of Otolaryngology-Head and Neck surgery, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522, Japan.

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Summary

Cartilage conduction (CC) hearing devices can be improved for occluded ears. A high-pass filter (HPF) effectively compensates for excessive low-tone emphasis, significantly enhancing speech recognition scores in these cases.

Keywords:
Aural atresiaCartilage conductionHearing aidHigh-pass filterLow-pass filterPerformance-intensity function

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Hearing Science

Background:

  • Cartilage conduction (CC) offers a novel hearing device option for individuals with aural atresia.
  • Occluded ears present challenges for CC devices due to effective low-tone transmission, leading to reduced speech recognition.

Purpose of the Study:

  • To investigate low-tone speech recognition using CC in occluded ears.
  • To determine if excessive low-tone emphasis negatively impacts maximum speech recognition scores with CC.

Main Methods:

  • Eight normal-hearing volunteers participated in the study.
  • Speech recognition was assessed using CC with an earplug (occluded) and air conduction (AC).
  • Measurements included performance-intensity functions and maximum speech recognition scores under high-pass filter (HPF) and low-pass filter (LPF) conditions.

Main Results:

  • A high-pass filter significantly improved maximum speech recognition scores for CC in occluded ears.
  • CC with an HPF achieved scores comparable to AC without filtering.
  • Low-pass filters reduced AC scores, with a second-order LPF yielding results similar to CC in occluded ears.

Conclusions:

  • The study demonstrates that a high-pass filter can effectively mitigate excessive low-tone emphasis in occluded ears.
  • Implementing HPF technology can enhance speech recognition performance for cartilage conduction hearing devices.