Publications

Journal Paper

  1. Kouei Yamaoka, Taishi Nakashima, Yukoh Wakabayashi, and Nobutaka Ono, "Minimum-Spanning-Tree-Based Time Delay Estimation Robust to Outliers," IEEE Access, vol.11, pp. 121284–121294, Nov. 2023. [Open Access]
  2. Kouei Yamaoka, Nobutaka Ono, and Shoji Makino, "Time-Frequency-Bin-Wise Linear Combination of Beamformers for Distortionless Signal Enhancement," IEEE/ACM Trans. Audio, Speech and Language Processing, vol.29, pp. 3461–3475, Nov. 2021. [Open Access] (The Telecom System Technology Student Award, The Telecommunications Advancement Foundation)

Preprint

  1. Kouei Yamaoka, Yukoh Wakabayashi, and Nobutaka Ono, "Estimation of Consistent Time Delays in Subsample via Auxiliary-Function-Based Iterative Updates," 13 pages, arXiv:2203.09723, 2022. [arXiv]

Peer-Reviewed International Conference Proceedings

  1. Kouei Yamaoka, Nobutaka Ono, and Yukoh Wakabayashi, "Sampling Frequency Mismatch Estimation by Auxiliary-Function-Based Iterative Maximization of Double-Cross-Correlation," in Proc. EUSIPCO, pp. 1125–1129, Aug. 2021.
  2. Kouei Yamaoka, Robin Scheibler, Nobutaka Ono, and Yukoh Wakabayashi, "Sub-Sample Time Delay Estimation via Auxiliary-Function-Based Iterative Updates," in Proc. WASPAA, pp. 125–129, Oct. 2019.
  3. Kouei Yamaoka, Li Li, Nobutaka Ono, Shoji Makino, and Takeshi Yamada, "CNN-based virtual microphone signal estimation for MPDR beamforming in underdetermined situations," in Proc. EUSIPCO, Sept. 2019.
  4. Kouei Yamaoka, Nobutaka Ono, Shoji Makino, and Takeshi Yamada, "Time-frequency-bin-wise switching of minimum variance distortionless response beamformer for underdetermined situations," in Proc. ICASSP, pp. 7908–7912, May 2019. (IEEE SPS Japan Student Conference Paper Award)
  5. Kouei Yamaoka, Nobutaka Ono, Shoji Makino, and Takeshi Yamada, "Performance Evaluation of Time-Frequency-Bin-Wise Switching Beamformer in Reverberant Environments," in Proc. NCSP, pp. 264–267, Mar. 2019.
  6. Kouei Yamaoka, Andreas Brendel, Nobutaka Ono, Shoji Makino, Michael Buerger, Takeshi Yamada and Walter Kellermann, "Time-Frequency-Bin-Wise Beamformer Selection and Masking for Speech Enhancement in Underdetermined Noisy Scenarios," in Proc. EUSIPCO, pp. 1596–1600, Sep. 2018.
  7. Kouei Yamaoka, Nobutaka Ono, Shoji Makino and Takeshi Yamada, "Abnormal sound detection by two microphones using virtual microphone technique," in Proc. APSIPA, Dec. 2017.
  8. Kouei Yamaoka, Shoji Makino, Nobutaka Ono and Takeshi Yamada, "Performance Evaluation of Nonlinear Speech Enhancement Based on Virtual Increase of Channels in Reverberant Environments," in Proc. EUSIPCO, pp. 2324–2328, Aug. 2017.

Non-Reviewed Domestic Conference Proceedings

  1. Kouei Yamaoka, Natsuki Ueno, Nobutaka Ono, "Derivation of Performance Limitation in Multichannel Time Delay Estimation," in Proc. 2023 Spring Meeting of ASJ, pp. 201–204, Mar., 2023 (in Japanese).
  2. Kouei Yamaoka, Taishi Nakashima, Nobutaka Ono, "Robust estimation of multiple time delays utilizing minimum spanning tree," in Proc. 2022 Autumn Meeting of ASJ, pp. 259–262, Sept., 2022 (in Japanese).
  3. Kouei Yamaoka, Taishi Nakashima, Yukoh Wakabayashi, Nobutaka Ono, "Online estimation of multiple time delays based on auxiliary function method," in Proc. 2022 Spring Meeting of ASJ, pp. 285–286, Mar., 2022 (in Japanese).
  4. Kouei Yamaoka, Nobutaka Ono, "Performance evaluation of time-frequency-bin-wise linear combination beamformer with respect to the number of spatial filters," in Proc. 2021 Autumn Meeting of ASJ, pp. 207–208, Aug., 2021 (in Japanese).
  5. Kouei Yamaoka, Nobutaka Ono, "Multiple time delays estimation via auxiliary-function-based iterative updates," in Proc. 2021 Spring Meeting of ASJ, pp. 371–374, Mar., 2021 (in Japanese).
  6. Kouei Yamaoka, Nobutaka Ono, "Underdetermined speech enhancement with multiple MVDR beamform and time-frequency soft mask," in Proc. 2020 Autumn Meeting of ASJ, pp. 123–126, Sept., 2020 (in Japanese).
  7. Kouei Yamaoka, Robin Scheibler, Nobutaka Ono, and Yukoh Wakabayashi, "Sub-Sample Time Delay Estimation for Two Signals with Auxiliary-Function-Based Optimization," in Proc. Signal Processing Symposium, pp. 62–67, Nov. 2019. [PDF link] (in Japanese, IEEE SPS Tokyo Joint Chapter Student Award)
  8. Kouei Yamaoka, Nobutaka Ono, Shoji Makino and Takeshi Yamada, "MVDR beamformer based on time-frequency-bin-wise switching technique for underdetermined speech enhancement," IEICE Technical Report, vol. 118, no. 497, SP2018-86, pp. 149–154, Mar., 2019 (in Japanese, IEICE Speech Committee Student Poster Award).
  9. Kouei Yamaoka, Nobutaka Ono, Shoji Makino and Takeshi Yamada, "Underdetermined speech enhancement with time-frequency-bin-wise switching beamformer and time-frequency masking," in Proc. 2018 Autumn Meeting of ASJ, pp.407–410, Sept., 2018 (in Japanese).
  10. Kouei Yamaoka, Nobutaka Ono, Shoji Makino and Takeshi Yamada, "Nonlinear microphone array with combination of multiple beamformers," in Proc. 2018 Spring Meeting of ASJ, pp. 475–478, Mar., 2018 (in Japanese, ASJ Student Presentation Award).
  11. Kouei Yamaoka, Nobutaka Ono, Takeshi Yamada and Shoji Makino, "Performance of maximum SNR beamformer based on virtual increase of channels in reverberant environments," in Proc. 2016 Autumn Meeting of ASJ, pp. 379–382, Sept., 2016 (in Japanese).

Co-authored publications

Journal Paper

  1. Yoshiki Masuyama, Kouei Yamaoka, Yuma Kinoshita, Taishi Nakashima, and Nobutaka Ono, "Causal and Relaxed-Distortionless Response Beamforming for Online Target Source Extraction, "IEEE/ACM Transactions on Audio, Speech, and Language Processing (Accepted)
  2. Takao Kawamura, Kouei Yamaoka, Yukoh Wakabayashi, Nobutaka Ono, and Ryoichi Miyazaki, "Acoustic Object Canceller: Removing Known Signal Using Blind Syncronization," EURASIP Journal on Audio, Speech, and Music Processing, no. 35, pp. 1–16, Sept. 2023
  3. Ryoga Jinzai, Kouei Yamaoka, Shoji Makino, Nobutaka Ono, Mitsuo Matsumoto, and Takeshi Yamada, "Wavelength-Proportional Interpolation and Extrapolation of Virtual Microphone for Underdetermined Speech Enhancement," APSIPA Transactions on Signal and Information Processing, vol. 12, no. 3, Jul. 2023.
  4. Ryoga Jinzai, Kouei Yamaoka, Shoji Makino, Nobutaka Ono, Takeshi Yamada, and Mitsuo Matsumoto, "Virtual microphone technique for binauralization for multiple sound images on 2--channel stereo signals detected by microphones mounted closely," APSIPA Transactions on Signal and Information Processing, vol. 12, no. 1, Jul. 2023.
  5. Yukoh Wakabayashi, Kouei Yamaoka, and Nobutaka Ono, "Sound Field Interpolation for Rotation-invariant Multichannel Array Signal Processing," IEEE/ACM Transactions on Audio, Speech, and Language Processing, vol. 31, pp. 2286–2298, Jun. 2023.
  6. Yoshiaki Bando, Hiroshi Saruwatari, Nobutaka Ono, Shoji Makino, Katustoshi Itoyama, Daichi Kitamura, Masaru Ishimura, Moe Takakusaki, Narumi Mae, Kouei Yamaoka, Yutaro Matsui, Yuichi Ambe, Masashi Konyo, Satoshi Tadokoro, Kazuyoshi Yoshii, and Hiroshi G. Okuno, "Low-Latency and High-Quality Two-Stage Human-Voice-Enhancement System for a Hose-Shaped Rescue Robot," Journal of Robotics and Mechatronics, vol. 29, no. 1, pp. 198–212, Feb. 2017.

Peer-Reviewed International Conference Proceedings

  1. Minato Uesaka, Hideto Kawauchi, Kouei Yamaoka, Yukoh Wakabayashi, Yuma Kinoshita, Nobutaka Ono, Jun Noguchi, Satoshi Watanabe, Noritaka Ichinohe, Seico Benner, Hidenori Yamasue, "Automatic Call Classification of Autism Model Marmosets by Deep Learning and Analysis of Their Vocal Development, " in Proc. APSIPA, pp. 2214–2218, Nov. 2023.
  2. Kenta Yamada, Yoshiki Masuyama, Kouei Yamaoka, Nobutaka Ono, "Fundamental Frequency Estimation Based on Finite-Order Harmonic Constraint Differential Equation," in Proc. APSIPA, pp. 849–853, Nov. 2023.
  3. Yui Kuriki, Taishi Nakashima, Kouei Yamaoka, Natsuki Ueno, Yukoh Wakabayashi, Nobutaka Ono, Ryo Sato, "Efficient Low-latency Convolution with Uniform Filter Partition and Its Evaluation on Real-time Blind Source Separation," in Proc. APSIPA, pp. 766–770, Nov. 2022.
  4. Haruki Nammoku, Kouei Yamaoka, Taishi Nakashima, Yukoh Wakabayashi, Nobutaka Ono, "Analysis and Source Separation of Overlapping Speech Using Corpus of Everyday Japanese Conversation," in Proc. ICA, Oct. 2022.
  5. Yoshiki Masuyama, Kouei Yamaoka, Nobutaka Ono, "Joint Optimization of Sampling Rate Offsets Based on Entire Signal Relationship Among Distributed Microphones," in Proc. INTERSPEECH, pp. 704–708, Sept. 2022.
  6. Koudai Mogi, Taishi Nakashima, Kouei Yamaoka, Yukoh Wakabayashi, and Nobutaka Ono, "Source Selection Using Multiple Directions of Arrival Estimation Based on Blind Source Separation," in Proc. NCSP, pp. 253–256, Mar. 2022 (Student Paper Award)
  7. Yoshiki Masuyama, Kouei Yamaoka, Yuma Kinoshita, and Nobutaka Ono, "Causal Distortionless Response Beamforming by Alternating Direction Method of Multipliers," in Proc. APSIPA, pp. 585–590, Dec. 2021.
  8. Yukoh Wakabayashi, Kouei Yamaoka, and Nobutaka Ono, "Rotation-robust beamforming based on sound field interpolation with regularly circular microphone array," in Proc. ICASSP, pp. 771–775, Jun. 2021.
  9. Ryoga Jinzai, Kouei Yamaoka, Mitsuo Matsumoto, Shoji Makino and Takeshi Yamada, "Wavelength Proportional Arrangement of Virtual Microphones Based on Interpolation/Extrapolation for Underdetermined Speech Enhancement," in Proc. EUSIPCO, Sept. 2019.
  10. Ryoga Jinzai, Kouei Yamaoka, Mitsuo Matsumoto, Takeshi Yamada and Shoji Makino, "Microphone Position Realignment by Extrapolation of Virtual Microphone," in Proc. APSIPA, pp. 367–372, Nov. 2018.
  11. Narumi Mae, Kouei Yamaoka, Yoshiki Mitui, Mitsuo Matsumoto, Shoji Makino, Daichi Kitamura, Nobutaka Ono, Takeshi Yamada and Hiroshi Saruwatari, "Ego Noise Reduction and Sound Localization Adapted to Human Ears Using Hose-shaped Rescue Robot," in Proc. NCSP, Mar. 2018.