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Bioacoustic Extraction System by Modeling Biological Sounds and Optimizing Demixing Vectors

Research Project

Project/Area Number 22K18778
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 20:Mechanical dynamics, robotics, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Itoh Toshihiro  東京大学, 大学院工学系研究科(工学部), 教授 (80262111)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2023: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords心音 / 生体音 / 音源抽出 / マイクロフォンアレイ / 体導音 / 非接触計測 / 非侵襲計測
Outline of Research at the Start

心音などの生体音の解析による疾患の自動診断技術が急速に発展しているものの、計測時に重畳するノイズの除去がボトルネックとなっている。本研究では、生体音のモデル構築と分離ベクトルの最適化により、マイクロフォンアレイで計測した多チャネル音から、各種生体音をノイズのない音源そのものの状態で抽出できるシステムを開発する。そして、このシステムを用いて、胸壁上で接触計測、さらには非接触計測した体導音から各生体音の抽出を試みる。

Outline of Final Research Achievements

The aim of this study is to realize a system to measure heart sounds with minimizing noises such as other biological sounds and ambient noises. Specifically, based on the mechanism of cardiac sound generation, the heart sounds were modeled as a time series signal consisting of four valvular sounds. Demixing vectors that can separate superimposed signals were also introduced. By simultaneously optimizing the parameters of the heart sounds model and the demixing vectors, we successfully developed an algorithm to extract the heart sounds from measured sounds and separate them into the valvular sounds.

Academic Significance and Societal Importance of the Research Achievements

開発したアルゴリズムは、心音を弁音の状態に分離(復元)でき,これは例えば肺高血圧症の非侵襲診断へ応用できることを示している。また、計測音のチャネル数増加により、環境・生体由来のノイズを全く含まない心音計測へ発展できると考えられ、これは心音データからの心血管疾患自動診断技術の飛躍的な性能向上に繋がる。さらに心音モデル部分を他のモデルに置き換えることで、他の生体音計測を含む包括的なヘルスケアモニタリングや、産業機器の異常音検知など、多方面への発展も可能である。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (11 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 複数の音響信号を用いた呼気成分計測手法の開発2024

    • Author(s)
      吉岡凛香,山本道貴,村松駿,高松誠一,伊藤寿浩
    • Journal Title

      電気学会論文誌E

      Volume: 144

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dog's Scratching Intensity Estimation Using Body-Conduction Microphone2023

    • Author(s)
      Muramatsu Shun、Hira Emi、Momoi Yasuyuki、Yamamoto Michitaka、Takamatsu Seiichi、Itoh Toshihiro
    • Journal Title

      IEEJ Transactions on Sensors and Micromachines

      Volume: 143 Issue: 7 Pages: 200-201

    • DOI

      10.1541/ieejsmas.143.200

    • ISSN
      1341-8939, 1347-5525
    • Year and Date
      2023-07-01
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Margined Horn-Shaped Air Chamber for Body-Conduction Microphone2023

    • Author(s)
      Muramatsu Shun、Kohata Yuki、Hira Emi、Momoi Yasuyuki、Yamamoto Michitaka、Takamatsu Seiichi、Itoh Toshihiro
    • Journal Title

      Sensors

      Volume: 23 Issue: 9 Pages: 4565-4565

    • DOI

      10.3390/s23094565

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 体導音マイクを用いた犬の掻破行動の強度推定2023

    • Author(s)
      村松駿,平瑛美,桃井康行,山本道貴,高松誠一,伊藤寿浩
    • Journal Title

      電気学会論文誌E

      Volume: 143

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] マイクロフォンアレイを用いた第二心音からの大動脈弁および肺動脈弁成分の分離(第2報)―第二心音モデルの構築―2023

    • Author(s)
      村松駿,山本道貴,高松誠一,伊藤寿浩
    • Organizer
      2023年度精密工学会秋季大会学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Remote Sensing of Exhaled Components Using Whistle Sounds2023

    • Author(s)
      Rinka Yoshioka, Michitaka Yamamoto, Seiichi Takamatsu, and Toshihiro Itoh
    • Organizer
      2023 IEEE Sensors
    • Related Report
      2023 Annual Research Report
  • [Presentation] Estimation of Splitting Interval in Second Heart Sound by Optimizing a Demixing Vector2023

    • Author(s)
      Shun Muramatsu, Michitaka Yamamoto, Seiichi Takamatsu, and Toshihiro Itoh
    • Organizer
      2023 IEEE Sensors
    • Related Report
      2023 Annual Research Report
  • [Presentation] 非接触心音計測における独立成分分析の適用の検討(第3報)―マイクロフォンアレイの構成が心音抽出性能に与える影響―2023

    • Author(s)
      村松駿,山本道貴,高松誠一,伊藤寿浩
    • Organizer
      2023年度精密工学会春季大会学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Cone-Shaped Air Chamber for the Wearable Scratching-Sound Sensing Device2022

    • Author(s)
      Shun Muramatsu, Yuki Kohata, Emi Hira, Yasuyuki Momoi, Michitaka Yamamoto, Seiichi Takamatsu, and Toshihiro Itoh
    • Organizer
      The 13th Japan-China-Korea Joint Conference on MEMS/NEMS
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Wearable Scratching-Sound Sensing Device for Animal Healthcare2022

    • Author(s)
      Shun Muramatsu, Emi Hira, Yasuyuki Momoi, Michitaka Yamamoto, Seiichi Takamatsu, and Toshihiro Itoh
    • Organizer
      2022 IEEE Sensors
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 犬の掻破音計測用首輪型デバイスのための体導音マイクの開発2022

    • Author(s)
      村松駿,平瑛美,桃井康行,山本道貴,高松誠一,伊藤寿浩
    • Organizer
      第39回「センサ・マイクロマシンと応用システム」シンポジウム
    • Related Report
      2022 Research-status Report

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Published: 2022-07-05   Modified: 2025-01-30  

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