Comparative performance evaluation of near 3D sound field reproduction system with directional loudspeakers and wave field synthesis. - Toshiyuki Kimura; Yoko Yamakata; Michiaki Katsumoto; Takuma Okamoto; Satoshi Yairi; Yukio Iwaya; Yôiti Suzuki (IUCS, 2010)

Multiple Description Coding Using Time Domain Division for MP3 coded Sound Signal. - Hoseok Wey; Akinori Ito; Takuma Okamoto; Yôiti Suzuki (J. Inf. Hiding Multim. Signal Process., 2010)

Morpion Solitaire 5D: a new upper bound 121 on the maximum score. - Akitoshi Kawamura; Takuma Okamoto; Yuichi Tatsu; Yushi Uno; Masahide Yamato (CCCG, 2013)

Extrapolation of Horizontal Ambisonics Data from Mainstream Stereo Sources. - Jorge Treviño; Takuma Okamoto; Yukio Iwaya; Junfeng Li; Yôiti Suzuki (IIH-MSP, 2013)

Generation of multiple sound zones by spatial filtering in wavenumber domain using a linear array of loudspeakers. - Takuma Okamoto (ICASSP, 2014)

Sound Field Reproduction Using Ambisonics and Irregular Loudspeaker Arrays. - Jorge Treviño; Takuma Okamoto; Yukio Iwaya; Yôiti Suzuki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Near-field sound propagation based on a circular and linear array combination. - Takuma Okamoto (ICASSP, 2015)

Analytical methods of generating multiple sound zones for open and baffled circular loudspeaker arrays. - Takuma Okamoto (WASPAA, 2015)

A Spatial Extrapolation Method to Derive High-Order Ambisonics Data from Stereo Sources. - Jorge Treviño; Yôiti Suzuki; Takuma Okamoto; Yukio Iwaya; Junfeng Li (J. Inf. Hiding Multim. Signal Process., 2015)

2.5D higher order ambisonics for a sound field described by angular spectrum coefficients. - Takuma Okamoto (ICASSP, 2016)

Subband wavenet with overlapped single-sideband filterbanks. - Takuma Okamoto; Kentaro Tachibana; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ASRU, 2017)

Analytical approach to 2.5D sound field control using a circular double-layer array of fixed-directivity loudspeakers. - Takuma Okamoto (ICASSP, 2017)

Angular spectrum decomposition-based 2.5D higher-order spherical harmonic sound field synthesis with a linear loudspeaker array. - Takuma Okamoto (WASPAA, 2017)

Horizontal Local Sound Field Propagation Based on Sound Source Dimension Mismatch. - Takuma Okamoto (J. Inf. Hiding Multim. Signal Process., 2017)

Localized Sound Zone Generation Based on External Radiation Canceller. - Takuma Okamoto (J. Inf. Hiding Multim. Signal Process., 2017)

Development of Wearable Sheet-Type Shear Force Sensor and Measurement System that is Insusceptible to Temperature and Pressure. - Shigeru Toyama; Yasuhiro Tanaka; Satoshi Shirogane; Takashi Nakamura; Tokio Umino; Ryo Uehara; Takuma Okamoto; Hiroshi Igarashi (Sensors, 2017)

An Investigation of Subband Wavenet Vocoder Covering Entire Audible Frequency Range with Limited Acoustic Features. - Takuma Okamoto; Kentaro Tachibana; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ICASSP, 2018)

2.5D Localized Sound Zone Generation with a Circular Array of Fixed-Directivity Loudspeakers. - Takuma Okamoto (IWAENC, 2018)

Improving FFTNet Vocoder with Noise Shaping and Subband Approaches. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (SLT, 2018)

Tacotron-Based Acoustic Model Using Phoneme Alignment for Practical Neural Text-to-Speech Systems. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ASRU, 2019)

Horizontal 3D Sound Field Recording and 2.5D Synthesis with Omni-directional Circular Arrays. - Takuma Okamoto (ICASSP, 2019)

Investigations of Real-time Gaussian Fftnet and Parallel Wavenet Neural Vocoders with Simple Acoustic Features. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ICASSP, 2019)

Real-Time Neural Text-to-Speech with Sequence-to-Sequence Acoustic Model and WaveGlow or Single Gaussian WaveRNN Vocoders. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (INTERSPEECH, 2019)

3D Localized Sound Zone Generation with a Planar Omni-Directional Loudspeaker Array. - Takuma Okamoto (WASPAA, 2019)

Transformer-Based Text-to-Speech with Weighted Forced Attention. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ICASSP, 2020)

Quasi-Periodic Parallel WaveGAN Vocoder: A Non-Autoregressive Pitch-Dependent Dilated Convolution Model for Parametric Speech Generation. - Yi-Chiao Wu; Tomoki Hayashi; Takuma Okamoto; Hisashi Kawai; Tomoki Toda (INTERSPEECH, 2020)

Text-to-Speech Synthesis. - Yoshinori Shiga; Jinfu Ni; Kentaro Tachibana; Takuma Okamoto (Speech-to-Speech Translation, 2020)

Multi-Stream HiFi-GAN with Data-Driven Waveform Decomposition. - Takuma Okamoto; Tomoki Toda; Hisashi Kawai (ASRU, 2021)

High-Intelligibility Speech Synthesis for Dysarthric Speakers with LPCNet-Based TTS and CycleVAE-Based VC. - Keisuke Matsubara; Takuma Okamoto; Ryoichi Takashima; Tetsuya Takiguchi; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ICASSP, 2021)

Close-Talking Recording with Planarly Distributed Microphones. - Takuma Okamoto (ICASSP, 2021)

Noise Level Limited Sub-Modeling for Diffusion Probabilistic Vocoders. - Takuma Okamoto; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (ICASSP, 2021)

2D Multizone Sound Field Synthesis with Interior-Exterior Ambisonics. - Takuma Okamoto (WASPAA, 2021)

Full-Band LPCNet: A Real-Time Neural Vocoder for 48 kHz Audio With a CPU. - Keisuke Matsubara; Takuma Okamoto; Ryoichi Takashima; Tetsuya Takiguchi; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (IEEE Access, 2021)

Quasi-Periodic Parallel WaveGAN: A Non-Autoregressive Raw Waveform Generative Model With Pitch-Dependent Dilated Convolution Neural Network. - Yi-Chiao Wu; Tomoki Hayashi; Takuma Okamoto; Hisashi Kawai; Tomoki Toda (IEEE ACM Trans. Audio Speech Lang. Process., 2021)

Speaking-Rate-Controllable HiFi-GAN Using Feature Interpolation. - Detai Xin; Shinnosuke Takamichi; Takuma Okamoto; Hisashi Kawai; Hiroshi Saruwatari (CoRR, 2022)

Automatic Spoken Language Acquisition Based on Observation and Dialogue. - Ryota Komatsu; Shengzhou Gao; Wenxin Hou; Mingxin Zhang 008; Tomohiro Tanaka; Keisuke Toyoda; Yusuke Kimura; Kent Hino; Yu Iwamoto; Kosuke Mori; Takuma Okamoto; Takahiro Shinozaki (IEEE J. Sel. Top. Signal Process., 2022)

Neural speech-rate conversion with multispeaker WaveNet vocoder. - Takuma Okamoto; Keisuke Matsubara; Tomoki Toda; Yoshinori Shiga; Hisashi Kawai (Speech Commun., 2022)

WaveNeXt: ConvNeXt-Based Fast Neural Vocoder Without ISTFT layer. - Takuma Okamoto; Haruki Yamashita; Yamato Ohtani; Tomoki Toda; Hisashi Kawai (ASRU, 2023)

Continuous Action Space-Based Spoken Language Acquisition Agent Using Residual Sentence Embedding and Transformer Decoder. - Ryota Komatsu; Yusuke Kimura; Takuma Okamoto; Takahiro Shinozaki (ICASSP, 2023)

E2E-S2S-VC: End-To-End Sequence-To-Sequence Voice Conversion. - Takuma Okamoto; Tomoki Toda; Hisashi Kawai (INTERSPEECH, 2023)

Harmonic-Net: Fundamental Frequency and Speech Rate Controllable Fast Neural Vocoder. - Keisuke Matsubara; Takuma Okamoto; Ryoichi Takashima; Tetsuya Takiguchi; Tomoki Toda; Hisashi Kawai (IEEE ACM Trans. Audio Speech Lang. Process., 2023)

FIRNet: Fundamental Frequency Controllable Fast Neural Vocoder With Trainable Finite Impulse Response Filter. - Yamato Ohtani; Takuma Okamoto; Tomoki Toda; Hisashi Kawai (ICASSP, 2024)

Convnext-TTS And Convnext-VC: Convnext-Based Fast End-To-End Sequence-To-Sequence Text-To-Speech And Voice Conversion. - Takuma Okamoto; Yamato Ohtani; Tomoki Toda; Hisashi Kawai (ICASSP, 2024)

Mobile PresenTra: NICT fast neural text-to-speech system on smartphones with incremental inference of MS-FC-HiFi-GAN for law-latency synthesis. - Takuma Okamoto; Yamato Ohtani; Hisashi Kawai (INTERSPEECH, 2024)

Challenge of Singing Voice Synthesis Using Only Text-To-Speech Corpus With FIRNet Source-Filter Neural Vocoder. - Takuma Okamoto; Yamato Ohtani; Sota Shimizu; Tomoki Toda; Hisashi Kawai (INTERSPEECH, 2024)

Fast Neural Speech Waveform Generative Models With Fully-Connected Layer-Based Upsampling. - Haruki Yamashita; Takuma Okamoto; Ryoichi Takashima; Yamato Ohtani; Tetsuya Takiguchi; Tomoki Toda; Hisashi Kawai (IEEE Access, 2024)

Mora-Level Prosody Prediction for Text-to-Speech Using Japanese BERT Without Accentual Labels. - Tadashi Ogura; Takuma Okamoto; Yamato Ohtani; Erica Cooper; Tomoki Toda; Hisashi Kawai (ICASSP, 2025)

Phoneme-Level Duration Controllable Neural Text-to-Speech With Phoneme Embedding Skip Connection and Modified Gaussian Duration Modeling. - Tadashi Ogura; Takuma Okamoto; Yamato Ohtani; Erica Cooper; Tomoki Toda; Hisashi Kawai (IEEE Access, 2025)