骨固定型ピックアップから導出した直接骨導音の音響特性  [in Japanese] Acoustic Characteristics of Direct Bone-Conducted Sounds Derived via Bone-Fixed Pick-Up  [in Japanese]

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Author(s)

    • 前田 秀彦 Maeda Hidehiko
    • 北海道医療大学心理科学部言語聴覚療法学科 Department of Communication Disorders, School of Psychological Science, Health Science University of Hokkaido
    • 西澤 典子 Nishizawa Noriko
    • 北海道医療大学心理科学部言語聴覚療法学科 Department of Communication Disorders, School of Psychological Science, Health Science University of Hokkaido
    • 本間 明宏 Honma Akihiro
    • 北海道大学大学院医学研究科耳鼻咽喉科・頭頸部外科 Department of Otolaryngology, Head and Neck Surgery, Hokkaido University Graduate School of Medicine
    • 玉重 詠子 Tamashige Eiko
    • 北海道医療大学心理科学部言語聴覚療法学科 Department of Communication Disorders, School of Psychological Science, Health Science University of Hokkaido
    • 米本 清 Yonemoto Kiyoshi
    • 岩手県立大学社会福祉学部人間福祉学科 Department of Human Welfare, Faculty of Social Welfare, Iwate Prefectural University

Abstract

<p>bone anchored hearing aid(Baha<sup>®</sup>:骨固定型補聴器)のチタニウムインプラントと圧電式加速度ピックアップ(骨固定型ピックアップ)を利用した頭蓋振動検出システムを構築し,発話者音声を皮膚経由しない直接骨導音として検出を試み,以下のことを明らかにした.1)頭蓋骨の振動実験において,直接骨導音導出系では,20 dBHL以上の入力があると入力の増加に伴い出力はほぼ線形的に増加し,1000-4000 Hzの高周波数帯域においても経皮骨導音導出系で見られた大きな出力の減衰は見られなかった.2)文章朗読時の直接骨導音のlong time averaged spectrum(LTAS:長時間平均スペクトラム)は,経皮骨導音と比較して1000 Hz以上の高周波数帯域の信号成分の減衰が少なく,気導コンデンサマイクロホンと比較して約0-10 dB程度の差であった.3)単音節を用いた受聴明瞭度試験により,経皮骨導音と直接骨導音の間に母音部分の正答率に有意差が認められ(p<.01),直接骨導音では,経皮骨導音で見られた異聴傾向が認められなかった.</p>

<p>We built a skull vibration detection system and attempted to detect direct bone-conducted sounds with skin penetration via a bone-anchored pick-up which consisted of a bone-anchored titanium implant and a piezoelectric acceleration meter. This study clarified the following. 1) In the oscillation experiment on the skull, the output level almost linearly increased more than 20 dBHL above the input level in the direct bone-conducted sounds. In comparison with non-direct bone-conducted sounds, there was no severe attenuation of output level in the high frequency band, from 1000 to 4000 Hz, in the direct bone-conducted sounds. 2) In long-term average spectrum (LTAS) analysis (sentence readings of 28 sec), decreasing of output power was shown at more than 1000 Hz in the non-direct bone-conducted sounds. However, few differences in output power (approximately 0-10 dB) were seen between direct bone-conducted sounds and air-conducted sounds. 3) In the monosyllable speech discrimination test, there was a significant difference (p<.01) in the percentages of correct answers for vowel sounds between non-direct and direct bone-conducted sounds. In comparison with non-direct bone-conducted sounds, there was no tendency to confuse vowel sounds in the case of direct bone-conducted sounds.</p>

Journal

  • The Japan Journal of Logopedics and Phoniatrics

    The Japan Journal of Logopedics and Phoniatrics 57(3), 294-304, 2016

    The Japan Society of Logopedics and Phoniatrics

Codes

  • NII Article ID (NAID)
    130005266297
  • Text Lang
    JPN
  • ISSN
    0030-2813
  • Data Source
    J-STAGE 
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