* [[Acknowledgements]] [#v999b499] The following people and related organizations have contributed to the development of HTS in various ways. It is their work that makes it all possible. In no special order: - Keiichi Tokuda~ Overall concept and design. - Heiga Zen~ Throwing away all old codes of HTS and rewriting them as HTS version 1.0, 1.1, 1.1b, 1.1.1, and 2.0. Current maintainerof HTS. - Jun-ichi Yamagishi~ Testing out various clustering and adaptation algorithms. - Takayoshi Yoshimura~ Development of the first version of HTS. - Masatsune Tamura~ Implementation of various speaker adaptation algorithms for HMM-based speech synthesis. - Shinji Sako~ Applying HMM-based speech synthesis to audio-visual speech. - Noboru Miyazaki~ Implementation of the first version of MSD-HMM trainer for pitch pattern modeling. - Tetsuya Yamada~ Testing out various HMM training algorithms for HMM-based speech synthesis. - Takashi Masuko~ Discussions in detail and implementing speech parameter generation algorithms. - Takao Kobayashi~ Discussions and supervising students working on speech synthesis. - Tadashi Kitamura~ Discussions and supervising students working on speech synthesis. - Satoshi Imai~ Supervising students working on speech synthesis. - Alan Black~ Discussions about all aspects of speech synthesis, helping us to use Festival, and supplying speech databases. - Tomoki Toda~ Discussions and implemantation of GV-based parameter generation algorithms. - Takashi Nose~ Testing out the version 2.0. - Steve Young, Phil Woodland, Mark Gales, and Other HTK developers~ Development of HTK. and many other important contributors (we had to leave them out since they are too many).