Editing Speech synthesis (section)

=== HMM-based synthesis ===

HMM-based synthesis is a synthesis method based on [[hidden Markov model]]s, also called Statistical Parametric Synthesis. In this system, the [[frequency spectrum]] ([[vocal tract]]), [[fundamental frequency]] (voice source), and duration ([[prosody (linguistics)|prosody]]) of speech are modeled simultaneously by HMMs. Speech [[waveforms]] are generated from HMMs themselves based on the [[maximum likelihood]] criterion.<ref>{{cite web |url=http://hts.sp.nitech.ac.jp/ |title=The HMM-based Speech Synthesis System |publisher=Hts.sp.nitech.ac.j |access-date=2012-02-22 |archive-date=2012-02-13 |archive-url=https://web.archive.org/web/20120213232606/http://hts.sp.nitech.ac.jp/ |url-status=dead }}</ref>