Effect of speaking style on parameters of fundamental frequency contour. - Norio Higuchi; Toshio Hirai; Yoshinori Sagisaka (SSW, 1994)

Automatic extraction of FO control parameters using statistical analysis. - Toshio Hirai; Naoto Iwahashi; Norio Higuchi; Yoshinori Sagisaka (SSW, 1994)

Automatic detection of major phrase boundaries using statistical properties of superpositional F0 control model parameters. - Toshio Hirai; Norio Higuchi; Yoshinori Sagisaka (EUROSPEECH, 1995)

Comparison of F0 Control Rules Derived from Multiple Speech Databases. - Toshio Hirai; Norio Higuchi; Yoshinori Sagisaka (Computing Prosody, 1997)

Use of pitch pattern improvement in the CHATR speech synthesis system. - Ken Fujisawa; Toshio Hirai; Norio Higuchi (EUROSPEECH, 1997)

Automatic extraction of fundamental frequency control rules by statistical analysis. - Toshio Hirai; Naoto Iwahashi; Norio Higuchi; Yoshinori Sagisaka (Syst. Comput. Jpn., 1997)

Manipulating speech pitch periods according to optimal insertion/deletion position in residual signal for intonation control in speech synthesis. - Toshio Hirai; Seiichi Tenpaku; Kiyohiro Shikano (INTERSPEECH, 2000)

Using start/end timings of spectral transitions between phonemes in concatenative speech synthesis. - Toshio Hirai; Seiichi Tenpaku; Kiyohiro Shikano (INTERSPEECH, 2002)

Using 5 ms segments in concatenative speech synthesis. - Toshio Hirai; Seiichi Tenpaku (SSW, 2004)

Analysis of major factors of naturalness degradation in concatenative synthesis. - Toshio Hirai; Hisashi Kawai; Minoru Tsuzaki; Nobuyuki Nishizawa (INTERSPEECH, 2005)

Developing a Test Bed of English Text-to-Speech System XIMERA for the Blizzard Challenge 2006. - Tomoki Toda; Hisashi Kawai; Toshio Hirai; Jinfu Ni; Nobuyuki Nishizawa; Junichi Yamagishi; Minoru Tsuzaki; Keiichi Tokuda; Satoshi Nakamura 001 (Blizzard Challenge, 2006)

Constructing a Phonetic-Rich Speech Corpus While Controlling Time-Dependent Voice Quality Variability for English Speech Synthesis. - Jinfu Ni; Toshio Hirai; Hisashi Kawai (ICASSP (1), 2006)

ATRECSS - ATR English speech corpus for speech synthesis. - Jinfu Ni; Toshio Hirai; Hisashi Kawai; Tomoki Toda; Keiichi Tokuda; Minoru Tsuzaki; Shinsuke Sakai; Ranniery Maia; Satoshi Nakamura 001 (Blizzard Challenge, 2007)

Utilization of an HMM-based feature generation module in 5 ms segment concatenative speech synthesis. - Toshio Hirai; Junichi Yamagishi; Seiichi Tenpaku (SSW, 2007)