HMM-based Speech Synthesis System (HTS) - Home

Welcome! †

The HMM-based Speech Synthesis System (HTS) has been developed by the HTS working group and others (see Who we are and Acknowledgments). The training part of HTS has been implemented as a modified version of HTK and released as a form of patch code to HTK. The patch code is released under a free software license. However, it should be noted that once you apply the patch to HTK, you must obey the license of HTK. Related publications about the techniques and algorithms used in HTS can be found here.

HTS version 2.1.1 is based on HTK-3.4.1 and includes forced-alignment of hidden semi-Markov model (HSMM) and other minor new features. Many bugs in HTS version 2.1 were also fixed. HTS does not include any text analyzers but the Festival Speech Synthesis System, DFKI MARY Text-to-Speech System, Flite+hts_engine, or other text analyzers can be used with HTS. This distribution includes demo scripts for training speaker-dependent and speaker-adaptive systems using CMU ARCTIC database (English).

For training Japanese voices, a demo script using the Nitech database is also prepared. Japanese voices trained by the demo script can be used on OpenJTalk, which is a Japanese text-to-speech synthesis.

News! †

• May 14, 2010

  HTS version 2.1.1 was was released.
  Its new features are

  • Based on HTK-3.4.1
  • Many bug fixes
  • HFst:
    • WFST converter for forced-alignment of HSMM
  • HMGenS:
    • Initial GV weight for parameter generation
    • Model-level alignments given from label of singing voice to determine note-level durations
  • HHEd:
    • Memory reduction options for context-clustering
  • Demo scripts:
    • Context-dependent GV without silent and pause phoneme
    • Demo using the Nitech Japanese database for singing voice synthesis

• December 25, 2009

  HTS version 2.1.1 beta was released to the hts-users ML members.

• August 27, 2009

  The first HTS meeting in Interspeech 2009.

• May 22, 2009

  HTS-Demo for Brazilian Portuguese is released.