* History [#af7558b8]
** 2007 [#afa4796d]
> ''November 1, 2007''
>> HTS version 2.1alpha was released to the hts-users ML members
> ''October 1, 2007''
>> HTS version 2.0.1 and hts_engine_API version 0.9 were released.~
The new features are
- Many bug fixes.
- Band structure for linear transforms.
- Stream-dependent variance flooring scales.
- State duration model mmf structure is changed.  In the previous versions we used a multi-variate Gaussian PDF to represent state duration PDFs of an HMM.     However, from this version we use multi-stream structure.  This is very important for the future HSMM support.  
- Demo scripts support LSP-type parameters for spectral representation in addition to cepstral ones.
- API-style implementation of hts_engine.  Old stand-alone hts_engine will be thrown away.

> ''September 20, 2007''
>> HTS version 2.0.1RC1 was released to the hts-users ML members.
> ''September 18, 2007''
>> HTS version 2.0.1RC1 was released to the internal working group members.
> ''March 20, 2007''
>> Mail address of hts-users ML changed to hts-users@sp.nitech.ac.jp
> ''March 7, 2007''
>> HTS website moved to http://hts.sp.nitech.ac.jp/

** 2006 [#z5d7dda6]
>''December 29:''
>> HTS version 2.0 was '''finally''' released :-)~
The new features are
- Based on [[HTK-3.4>http://htk.eng.cam.ac.uk/download.shtml]].
- Compilation without [[SPTK>http://www.sp.nitech.ac.jp/~tokuda/SPTK/index.html]].
- The [[license of HTS>License]] was slightly modified.
- Support gcc4.
- Thousands of fixed bugs.
- HRest can generate state duration densities (-g option).
- Model boundaries can be given to HERest (-e option).~
We may specify a part of model boundaries (e.g, pause positions).
- Reduced-memory implementation of context clustering in HHEd (-r option).
- Each decision tree can have a name with regular expression (-p option).~
 TB 000 {(*-a+*, *-i+*, *-u+*).state[2]}
 TB 000 {(*-sil+*, *-pau+*).state[3]}
As a result, different two trees can be constructed for consonants and vowels, respectively.
- The interface of HMGenS has been switched from ''HHEd-style'' to ''HERest-style''.
- Flexible model structures in HMGenS (in the previous version, the first stream is assumed as mcep, and the others are assumed as log F0).  Non-left-to-right models and full covariance matrices for state output pdfs can also be used.
- EM-based parameter generation algorithm (-c option), i.e, mixture of Gaussians can be used. 
-- -c 0: Cholesky decomposition
-- -c 1: EM (with fixed state sequence)
-- -c 2: EM (phone boundaries can be given with -e option)
- Random generation algorithm is also supported (set config. variable RNDPG = TRUE).
- Speaker adaptation, adaptive training, and semi-tied covariance transforms are supported for multi-stream HMMs/MSD-HMMs. 
-- MLLRMEAN, MLLRCOV, and CMLLR-based adaptation.
-- CMLLR-based adaptive training.
-- Decision trees for context clustering can be used to define regression classes for adaptation.
-- HMGenS can read MLLRMEAN, MLLRCOV, CMLLR, and SEMIT transforms for adaptation.
- MAP adaptation is also supported.
- Performance improvements in hts_engine.
- Miscellaneous changes.

>''December 4:''
>> HTS version 2.0RC3 was released to members of Mailing List.
>''July 1:''
>> HTS version 2.0RC2 was released to members of Mailing List.
>''March 3:''
>> HTS version 2.0RC1 was released to members of Mailing List.
>''February 15:''
>> HTS version 2.0RC0 was released to the internal working group. 

** 2003 [#ld26312a]
>''December 26:''
>> HTS version 1.1.1 was released. The new features were
- Based on HTK-3.2.1
- Demo script for ARCTIC database
- Demo script for an original database (Japanese)
- Variance flooring in demo script
- Postfiltering in hts-engine
- Many fixed bugs

>''Oct. 14:''
>> New HTS voices trained by ARCTIC databases were released. 
>''June 11:''
>>  HTS version 1.1b was released.
>''May 9:''
>> HTS version 1.1 was released. The new features were
- A small synthesis engine (to be called from Festival).
- HMM file format converter for the engine.
- Many fixed bugs (Thanks for reporting them).
- Accompanied by HTS voices for Festival.

>''January 21:''
>> Minor revision was made to HTS version 1.0. 

** 2002 [#s0e2a8a8]
>''December 25:''
>> HTS version 1.0 was released.
//>> The first paper about eigenvoice for HMM-based speech synthesis was //appeared in ICSLP'02.
//** 1999 [#v67c04e5]
//> ''September:''
//>> The first paper about the current HTS framework was appeared in //Eurospeech'99. 
//> ''March:''
//>> The first paper about MSD-HMM was appeared in ICASSP'99.
//** 1998 [#v760e959]
//> ''November:''
//>> The first paper about speaker adaptation for the HMM-based speech synthesis //using MLLR was appeared in ESCA/COCOSDA workshop on speech synthesis.
//** 1997 [#v95967aa]
//> ''September:''
//>> The first paper about speaker interpolation for the HMM-based speech //synthesis was appeared in Eurospeech'97.
** 1995 [#v5285cba]
> ''May:''
>> The first paper about the speech parameter generation algorithm was appeared  in ICASSP'95.

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