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Noise reduction for hearing aids using digital signal processing

Research Project

Project/Area Number 05452333
Research Category

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

Allocation TypeSingle-year Grants
Research Field Otorhinolaryngology
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SONE Toshio  Tohoku Univ., R.I.E.C., Professor, 電気通信研究所, 教授 (50005245)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI T  Tohoku Univ., School of Medicine, Associate Professor, 医学部, 助教授 (80133958)
TAKASAKA T  Tohoku Univ., School of Medicine, Professor, 医学部, 教授 (80004646)
OZAWA K  Tohoku Univ., R.I.E.C., Research Associate, 電気通信研究所, 助手 (30204192)
ASANO F  Tohoku Univ., R.I.E.C., Research Associate, 電気通信研究所, 助手 (00231895)
SUZUKI Y  Tohoku Univ., R.I.E.C., Associate Professor, 電気通信研究所, 助教授 (20143034)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsDigital Hearing Aid / Noise Reduction / Howling Suppression / Adaptive Microphone Array / Adaptive Feedback Canceler / Speech Intelligibility / ハウリング / ディジタル信号処理 / 補聴器 / RLSアルゴリズム / 仮想相関行列法 / 音声強調 / 周波数圧縮 / 適応ノッチフィルタ
Research Abstract

1. Algorithm for noise reduction An algorithm for reducing stationary/nonstationary environmental noise has been developed and has been verified via computer simulation. Moreover, total noise reduction system has been constructed using signal processing system. For ebvironmental noise reduction, an adaptive beamforming technique was combined with conventional fixed beamformer to obtain robust attenuation for not only stationary noise but also nonstationary noise. On the other hand, for reducing howling, adaptive feedback canceler was introduced.
2. Evaluation The system developed has been applied to real environmental noise and was evaluated in terms of the amount of noise reduction and other issues. The results can be summarized as follows : As for the environmental noise, directional noise with large power was reduced by more than 20 dB,while nondirectional noise such as reverberation is also reduced by 10 dB.As for the howling, howling margin increased by 20 dB.
3. Improvement in Speech Intelligibility Noise reduction system has been applied to the speech corrupted by noise, and the listening test was conducted. The results can be summarized as follows : As for the environmental noise reduction, the speech intelligibility was improved from 50 % to 70 % by introducing the proposed system. As for the howling cancellation, periodic signals such as voiced speech is corrupted by the conventional adaptive feedback canceler. However, use of frequency compressor together with adaptive feedback canceler as proposed in our system yields little corruption and no effect on speech intelligibility.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report

Research Products

(14 results)

All Other

All Publications (14 results)

  • [Publications] F.Asano: "Weighted RLS adaptive beamformer with initial directivity" IEEE SA. (掲載決定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] F.Asano: "Signal processing techniques applicable to hearing aids" Proc.ICSLP 94. 2099-2102 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Joson: "Hearing aid howling suppression by adaptive feedback cancellation with frequency" Proc.WESTPRAC V. 919-924 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Joson: "Adaptive feedback cancellation with frequency compression for hearing aids" J.Acoust.Soc.Am.94. 3248-3254 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] F.Asano: "Weighted RLS adaptive beamformer with initial directivity" IEEE SA. (accepted for publication).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] F.Asano: "Signal processing techniques applicable to hearing aids" Proc. ICSLP 94. 2099-2102 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Joson: "Hearing aid howling suppression by adaptive feedback cancellation with frequency compression" Proc. WESTPRAC. V. 919-924 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Joson: "Adaptive feedback cancellation with frequency compression for hearing aids" J.Acoust. Soc. Am.Vol. 94, No. 6. 3248-3254 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] F.Asano: "Signal processing techniques applicable to hearing aids" Proc.ICSLP 94. 2099-2102 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Joson: "Hearing aid howling suppression by adaptive feedback cancellation with frequency compression" Proc.WESTPRAC V. 919-924 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Harry Alfonso L.Joson: "Adaptive feedback cancellation with frequency compression for hearing aids" Journal of the Acoustical Society of America. 94. 3248-3254 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Harry Joson: "適応ノッチフィルタを用いたハウリング抑圧手法に関する一考察" 日本音響学会研究発表会講演論文集. 1993年10月. 519-520 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] ハリー・ホソン: "ノッチフィルタを用いたハウリング抑圧手法の補聴器への適応について" 電子情報通信学会技術報告. EA93-31. 1-8 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Harry Joson: "FIRノッチフィルタを用いたハウリング抑圧手法に関する一考察" 日本音響学会研究発表会講演論文集. 1994年3月(発表予定). (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-03-31   Modified: 2016-04-21  

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