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Investigation of hearing ability of divers in hyperbaric helium-air mixture environment in submergence

Research Project

Project/Area Number 03650274
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 電子通信系統工学
Research InstitutionShizuoka University

Principal Investigator

SUZUKI Hisayoshi  Shizuoka University, Faculty of Engineering, Professor, 工学部, 教授 (90006221)

Co-Investigator(Kenkyū-buntansha) NAKAI Takayoshi  Shizuoka University, Faculty of Engineering, Research Associate, 工学部, 助手 (90109132)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1992: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1991: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsHyperbaric He-Air / Diver' Hearing / Headphones / Air-Conduction Hearing / Bone-Conduction Hearing / Sound absorber / Helium Speech / Database / ダイバ-の聴力 / イアプロテクタ / 高圧ヘリウム混合気体 / 最小可聴値 / 吸音率 / ヘリウム音声デ-タベ-ス
Research Abstract

1. Frequency characteristics of six kinds of headphones were measured at ambient pressures of 1ATA to 31ATA. A YAMAHA HP-1 was best suited for the present purpose because its frequency characteristics were stable even at the high ambient pressures. 2. The minimum-audible sound pressure level (MAP) and the equal-loudness contours (ELC) were measured at 1ATA to 31 ATA with an audiometer RION AA-71. To prevent the background noise, the headphone unit of HP-1 was build in an ear-protector. MAPs in normal air and at 5 meter depth were properly measured. Since the lower frequency noise could not be reduced by the ear-protector, MAPs at deeper than 20 meter were measured only at higher frequency than 1.5KHz. ALCs were widely changed by the ambient preesures. The curve of ALC at deeper than 120 meter were looked like a letter "w", showing that ALCs have local minima at 2KHz and 6KHz, and a peak at 3KHz. 3. The bone-conduction hearing thresholds (BCT) were also measured. The variation of BCT by the ambient pressure was less than that of MAP. Using an electronic circuit modeling of the ear canal, a shift of peak frequency of MAP in hyperbaric pressures was partly reasoned by change in acoustic trans-mission character of the ear canal. 5. The sound absorption coefficients of three absorber materials were measured at hyperbaric N_2-air and He-air. The curves of absorption coefficients were shifted to higher frequency region. In other words the sound absorption coefficient were reduced in hyperbaric pressure. It was found that the frequencies at which the absorption coefficient remains unchanged were proportional with the exponent of the product of gas density and cubic power of velocity. The exponents are 0.7 for glass wool, 0.5 for felt, and 0.7 for absorption sponge. 6. We have implemented a helium speech database on a personal computer.At present, there are 3,000 data recorded with phoneme label.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 河西 康仁: "有人潜水実験用シミュレータ内の騒音の測定" 信学技報. EA91. 9-16 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 鈴木 久喜: "高圧気体環境におけるヘッドホンの特性" 信学技報. EA91. 17-24 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 千葉 哲央: "ヘリウム音声データベースの構築" 信学技報. EA92. 34-46 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 城内 良直: "ヘリウム音声データベース" 音響学会講論集. 329-330 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hisayoshi SUSUKI: "A Database of Japanese Helium Speech" Proc,of China-Japan Joint Meeting of Underwater Medicine and Techology. 28-39 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 河西 康仁: "高圧ヘリウム空気中における最小可聴値の測定" 音響学会講論集. 445-446 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 倉本 克治: "高圧気体環境における吸音率の測定" 音響学会講論集. 869-870 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中井 孝芳: "ヘリウム音声データベースとその応用" 音響学会講論集. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 倉本 克治: "潜水における高圧ヘリウム環境での吸音材の吸音率の測定" 音響学会講論集. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yasuhito Kawanishi, Takayoshi Nakai, and Hisayoshi Suzuki: "Measurement of Background Noise in a Manned Submergence Simulator (in Japanese)" IEICE Technical Reports. EA91-12. 9-16 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hisayoshi Suzuki, Takayoshi Nakai, and Yoshiyuki Satsukawa: "Characteristics of Headphones in High Pressure Gas Environment (in Japanese)" IEICE Technical Reports. EA91-13. 17-24 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tetsuo Chiba, Yoshinao Kiuchi Takayoshi Nakai, and Hisayoshi Suzuki: "Construction of a Helium Speech Database (in Japanese)" IEICE Technical Reports. EA92-22. 39-46 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yoshinao Kiuchi, Tetsuo Chiba, Takayoshi Nakai, and Hisayoshi Suzuki: "Helium Speech Database with Phoneme Labels (in Japanese)" Autumn Meeting of Acoustical Society of Japan. 1-P-15. 329-330 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yasuhito Kawanishi, Takayoshi Nakai, and Hisayoshi Suzuki: "Measurement of Minimum Audible Sound Pressure of Divers in Hyperbaric helium-Oxygen Environment (in Japanese)" Autumn Meeting of Acoustical Society of Japan. 1-9-18. 445-446 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Katsuji Kuramoto, Takayoshi Nakai, and Hisayoshi Suzuki: "Measurement of Sound Absorption Coefficient of Sound Absorber in High Pressure Gas Environment (in Japanece)" Autumn Meeting of Acoustical Society of Japan. 3-P-5. 869-870 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hisayoshi Suzuki and Takayoshi Nakai: "A Database of Japanese Helium Speech" Proc. of China-Japan Joint Meeting of Underwater Medicine and Technology. 28-39 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takayoshi Nakai, Yoshinao Kiuchi, and Hisayoshi Suzuki: "Helium Speech Database with Phoneme Labels and its Applications (in Japanese)" Spring Meeting of Acoustical Society of Japan. 1-8-4. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Katsuji Kuramoto, Takayoshi Nakai, and Hisayoshi Suzuki: "Measurement of Sound Absorption Coefficient of Sound Absorber in High Pressure helium-Oxygen Gas Environment (in Japanese)" Spring Meeting of Acoustical Society of Japan. 1-6-3. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 千葉 哲央: "ヘリウム音声データベースの構築" 信学技報. EA92. 34-46 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 城内 良直: "ヘリウム音声データベース" 音響学会講論集. 329-330 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Hisayoshi SUZUKI: "A Database of Japanese Helium Speech" Proc.of China-Japan Joint Meeting of Underwater Medicine and Techology. 28-39 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 河西 康仁: "高圧ヘリウム空気中における最小可聴値の測定" 音響学会講論集. 445-446 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 倉本 克治: "高圧気体環境における吸音率の測定" 音響学会講論集. 869-870 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中井 孝芳: "ヘリウム音声データベースとその応用" 音響学会講論集. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 倉本 克治: "潜水における高圧ヘリウム環境での吸音材の吸音率の測定" 音響学会講論集. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 河西 康仁: "有人潜水実験用潜水シミュレ-タ内の騒音測定" 電子情報通信学会技術研究報告 応用音響研究会. EA91ー12. 9-16 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 鈴木 久喜: "高圧気体環境におけるヘッドホンの時性" 電子情報通信学会技術研究報告 応用音響研究会. EA91ー13. 17-24 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 千葉 哲央: "ヘリウム音声のデ-タベ-スの構築" 電子情報通信学会技術研究報告 応用音響研究会. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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