Education

• 2022.4 - 2023.3

  Ph.D., Computer Science

  University of Tsukuba, Ibaraki, Japan

  • Supervisor: Prof. Takeshi Yamada
  • Thesis title: Study on overlap-aware speaker diarization and its applications
    • Thesis
    • Slides
• 2015.4 - 2017.3

  M.E., Information Science and Technology

  The University of Tokyo, Tokyo, Japan

  • Supervisor: Prof. Kiyoharu Aizawa
  • Thesis title: Personalized Object Recognition
• 2011.4 - 2015.3

  B.E., Information and Communication Engineering

  The University of Tokyo, Tokyo, Japan

  • Supervisor: Prof. Kiyoharu Aizawa

Work Experience

• 2024.2 - Present

  Research Specialist

  NTT, Inc. (formerly NTT Corporation), Human Informatics Laboratories

  • Research topic
    • Speech technology
• 2021.10 - 2024.1

  Senior Researcher

  Hitachi, Ltd. Research & Development Group

  • Team leader (2021.10-2022.9, 2023.4-2024.1)
  • Tech lead (2022.10-2023.3)
  • Research topic
    • Speaker diarization (2021-2023)
    • Streaming active learning (2022-2024)
• 2017.4 - 2021.9

  Researcher

  Hitachi, Ltd. Research & Development Group

  • Research topic
    • Multimodal enviromnental recognition for human-robot interaction (2017-2019)
    • Meeting transcription using distributed microphones (2019-2021)
    • Speaker diarization (2019-2021)

Honors and Awards

• 2024

  Honorable Mention Award at IEEE Spoken Language Technology Workshop (SLT) 2024

  • For the paper entitled "Recursive Attentive Pooling for Extracting Speaker Embeddings from Multi-Speaker Recordings"
  • Award certificate
• 2024

  2nd prize in The 8th CHiME Speech Separation and Recognition Challenge (CHiME-8) Task 1

  • As the NTT team
  • Technical report / Slides / Poster
  • In charge of preparation of simulated mixtures and pretraining of EEND-VC
• 2023

  Itakura Prize Innovative Young Researcher Award, The Acoustical Society of Japan

  • For the research on overlap-aware speaker diarization for unkonwn numbers of speakers
• 2021

  2nd prize in The Third DIHARD Speech Diarization Challenge (DIHARD III)

  • As the Hitachi-JHU team
  • Technical report / Slides
  • In charge of EEND-EDA, EEND as post-processing, and system ensemble
• 2018

  2nd prize in The 5th CHiME Speech Separation and Recognition Challenge (CHiME-5)

  • As the Hitachi-JHU team
  • Technical report / Slides
  • In charge of speech separation and server cooling 🌬️
• 2017

  Outstanding Research Presentation Award, The Institute of Image Information and Television Engineers

  • For the presentation in PRMU, Feb, 2017

Invited Talks

• 2023.8

  Speaker Diarization: A Key to Solving Cocktail Party Problem

  • Speech-based Communication for Robots and Systems (IEEE RO-MAN 2023 Workshop)
• 2019.7

  Face-Voice Matching Using Cross-Modal Embeddings (In Japanese)

  • The 22nd Meeting on Image Recogntion and Understanding (MIRU)

Membership

• Institute of Electrical and Electronics Engineers (IEEE)
• IEEE Signal Processing Society (SPS)
• Acoustical Society of Japan (ASJ): No. 22704
• Information Processing Society of Japan (IPSJ)

Academic Services

• Session chair / vice chair

  • IEEE ICASSP (2022, 2025)
  • ISCA Interspeech (2025)
  • ASJ Annual Meeting (2024-)

• Board member

  • IPSJ SIG-SLP (2025.4-)
  • ASJ-SP (2025.4-)
  • IEICE Technical Committee on Speech (2025.6-)

• Organizer

  • The Joint Workshop on HSCMA and CHiME 2026 (a satellite workshop of ICASSP 2026)

• Meta Reviewer

  • ICASSP (2026)

• Reviewer

  Journal

  • IEEE/ACM Transactions on Audio, Speech, and Language Processing (2021-2025)
  • IEEE Transactions on Multimedia (2020-2021)
  • IEEE Transactions on Neural Networks and Learning Systems (2021)
  • IEEE Transactions on Pattern Recognition and Machine Intelligence (2020)
  • IEEE Transactions on Affective Computing (2023)
  • IEEE Open Journal of Signal Processing (2023-2024)
  • IEEE Signal Processing Letters (2024)
  • Computer Speech & Language (2021-2022, 2025)
  • Speech Communication (2022-2024)
  • EURASIP Journal on Audio, Speech and Music Processing (2023)
  • Neural Networks (2022)
  • THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN (2024)

  Conference

  • ICASSP (2019-2025)
  • INTERSPEECH (2024-2025)
  • ASRU (2023, 2025)
  • SLT (2022, 2024)
  • EUSIPCO (2021-2023)
  • WASPAA (2023, 2025)
  • DCASE (2020-2021, 2023-2025)
  • MLSP (2021, 2023)
  • MMSP (2023)
  • APSIPA ASC (2021)
  • RO-MAN (2022)
  • ICML (2020)
  • ACMMM (2025)

Internship Supervision

• Natsuo Yamashita (The University of Tokyo, 2021.8 - 2022.2) @Hitachi, Ltd.
• Aoi Ito (Hosei University, 2022.11 - 2024.1) @Hitachi, Ltd.