Abstract: This paper describes the design of a unified framework for a multilingual text-to-speech (TTS) synthesis engineCrystal. The unified framework defines the common TTS modules for different languages and/or dialects. The interfaces between consecutive modules conform to Speech Synthesis Markup Language (SSML) specification for standardization, interoperability, multilinguality, and extensibility. Detailed module divisions and implementation technologies for the unified framework are introduced, together with possible extension for algorithm research and evaluation of TTS synthesis.
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