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STUDY ON A NEW COCHLEAR IMPLANT SYSTEM BASED ON PHYSIOLOGICAL MODEL OF AUDITORY PERIPHERY SYSTEM

Research Project

Project/Area Number 04680030
Research Category

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

Allocation TypeSingle-year Grants
Research Field Informatics
Research InstitutionSHIZUOKA UNIVERSITY

Principal Investigator

KITAZAWA Shigeyoshi  SHIZUOKA UNIVERSITY, COMPUTER SCIENCE, Associate Professor, 工学部, 助教授 (00109018)

Co-Investigator(Kenkyū-buntansha) 伊藤 壽一  大津赤十字病院, 耳鼻科, 部長 (90176339)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsCOCHLEAR IMPLANT / AUDITORY MODEL / DIGITAL SIGNAL PROCESSOR / FIR FILTER / ACOUSTIC SIMULATION / SPEECH CODING / FRフィルター / マルチマイクロプロセッサ
Research Abstract

This two year project consists of six parts. (1) A real-time processor of the auditory filter and the hair-cell model had been implemented on multiple digital signal processors. (2) A new speech processor was designed using an auditory model to improve the quality of consonants. (3) A new acoustic simulation was designed to cause perceptually equivalent sensation of loudness in accordance with the measured T-level. C-level of electric current. (4) The FIR filters of low frequency were redesigned to have higher resolution for the characteristic frequencies. (5) Compound speech processing was examined with the auditory model for the voiceless region and the LPC model for the voiced region. (6) Trigger pulse was extracted based on speech coding technology.
Results for this project were as follows. Fixed point signal processing realized with sufficient precision on a microprocessor. The new speech processor extracts the fundamental frequency from lower channels of the auditory model. Within a pitch interval, four most firing channels were selected to stimulate in sequence. Perceptual test by acoustic simulation had shown improved quality of voiced stops, voiceless fricatives, voiceless africatives, voiced africatives, and nasals. Vowel quality was not as good as the current practical speech processor. The compound processing was designed to improve vowel part of speech by LPC model. The LPC model could improve voice quality of vowels, however, had degraded consonants. Problem remained is that consonant part of speech was not necessarily processed with the auditory model but LPC instead. We examined different approach based on wave coding technology that extracts sequence of driving impulse to minimize squared error of synthesized wave. Extraction algorithm took into account the constraints of cochlear implant system. Speech perception test by analysis and synthesis had shown good quality of vowels and fair quality of consonants. This seems worth continuing further study.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 北澤茂良.村本一之.水谷雄児: "聴覚モデルに基づくスピーチプロセッサと音響シミュレーション" 日本音響学会講演論文集. 10月. 345-346 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 高橋直之.北澤茂良: "聴覚モデルによる音声の分析表示" 日本音響学会講演論文集. 10月. 297-298 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] K.Muramoto, K.Yamada, M.Tanaka, S.Kitazawa, S.Kojima, T.Haji and J.Ito: ""Real time simulation of inner hair cell/auditory neuron synapse model"" Proc.1992 Autumn M.A.S.J.423-424 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Haji, K.Tate, K.Kataoka and S.Kitazawa: ""Acoustic analysis of consonants by auditory model"" Proc.34-th Annual M.J.L.P.60 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] N.Takahasi and S.Kitazawa: ""Halftone visualization of analyzed speech with the auditory model"" Proc.1993 Autumn M.A.S.J.297-298 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] S.Kitazawa, K.Muramoto and Y.Mizutani: ""The speech processor based on the auditory model and its acoustic simulation"" proc.1993 Autumn M.A.S.J.345-346 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 北澤茂良,村本一之,水谷雄児: "聴覚モデルに基づくスピーチプロセッサと音響シミュレーション" 日本音響学会講演論文集. 10月. 345-346 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高橋直之,北澤茂良: "聴覚モデルによる音声の分析表示" 日本音響学会講演論文集. 10月. 297-298 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 上村 大一郎.北澤 茂良: "母音と無声破裂子音の音声波形の特徴による判別" 日本音響学会講演論文集. 1-2 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 村本 一之,山田 耕史,田中 勝,北澤 茂良,小嶋 卓 土師 知行,伊藤 壽一: "内有毛細胞/聴神経シナプスモデルの実時間シミュレーション" 日本音響学会講演論文集. 423-424 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 土師 知行,楯 敬蔵,片岡 和哉,北澤 茂良: "聴覚モデルによる子音の音響学的分析" 日本音声言語医学会学術講演会予稿. 60- (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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