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Developer(s)Nagoya Institute of Technology
Stable release
0.92 / December 25, 2015; 5 years ago (2015-12-25)
Preview release
3.9 / 2017/12/25
Operating systemLinux
Available inJapanese, English, Chinese
TypeVocal Synthesizer Application
LicenseModified BSD license

Sinsy (Singing Voice Synthesis System) (しぃんしぃ) is an online Hidden Markov model (HMM)-based singing voice synthesis system by the Nagoya Institute of Technology that was created under the Modified BSD license.[1]


The online demonstrator is free to use, but will only generate tracks up to 5 minutes. The user uploads data in the MusicXML format, which the Sinsy website reads to output a WAV file of the generated voice. Gender factor, vibrato intensity, and pitch shift can be adjusted prior to output.[2]

As of December 25, 2015 the official creators of the Sinsy were Keiichi Tokuda (Producer and designer), Keiichiro Oura (Design and Development),[3] Kazuhiro Nakamura (Development and Main Maintainer), and Yoshihiko Nankaku.[4]

It was originally only in Japanese and English but Mandarin was later added, the website only supports languages for English and Japanese despite this currently.[5][6]

In 2016, Sinsy stated using "Deep learning" processing known as "DNN".[7]


  • Yoko (謡子), Japanese female vocal, she has two vocals for the service right now both in Japanese, one being a beta and the other a fully released version.
  • Xiang-Ling (香鈴), Japanese female vocal, an English vocal was added Christmas, 2015. Mandarin was added also to her language capabilities.
  • Matsuo-P (松尾P), English masculine vocal.
  • Namine Ritsu S (波音リツS), a Japanese male vocal currently in beta. Originally produced for UTAU, it released on December 25, 2013.
  • Unidentified; an unknown vocal in Japanese
  • Unidentified; a second unknown vocal in Japanese


  1. ^ Ju-Yun Cheng, Yi-Chin Huang, Chung-Hsien Wu (2014-12-04). "HMM-based Mandarin Singing Voice Synthesis Using Tailored Synthesis Units and Question Sets" (PDF). Association for Computational Linguistics and Chinese Language Processing. Retrieved 2017-05-17.CS1 maint: multiple names: authors list (link)
  2. ^ Hentai (2012-12-27). "Sinsy Updates to 3.3 & Releases English Demo". Engloids.Info. Retrieved 2015-06-04.
  3. ^ "Keiichiro Oura". Nagoya Institute of Technology. Retrieved 2017-05-17.
  4. ^ "The HMM-Based Singing Voice Synthesis System "Sinsy" version 0.92". Retrieved 2016-01-28.
  5. ^ ITmedia ニュース - 初音ミクとも簡単に対話できる「MMDAgent」、その詳細を聞いてきた. Retrieved November 23, 2013
  6. ^ Nakamura, K.; Oura, K.; Nankaku, Y.; Tokuda, K. (May 2014). "HMM-Based singing voice synthesis and its application to Japanese and English". 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP): 265–269. doi:10.1109/ICASSP.2014.6853599.
  7. ^