The hts_engine API is software to synthesize speech waveform from HMMs trained by the HMM-based speech synthesis system (HTS). This software is released under the Modified BSD license. See the COPYING file in the same directory as this file for the license. The hts_engine_API has been developed by several members of HTS working group and some graduate students in Nagoya Institute of Technology: Keiichi Tokuda http://www.sp.nitech.ac.jp/~tokuda/ (Produce and Design) Keiichiro Oura http://www.sp.nitech.ac.jp/~uratec/ (Design and Development, Main Maintainer) Heiga Zen Shinji Sako http://www.mmsp.nitech.ac.jp/~sako/