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RHVoice is a free and open source speech synthesizer.
Speech synthesis method
RHVoice uses statistical parametric synthesis. It relies on existing open source speech technologies (mainly HTS and related software).
Voices are built from recordings of natural speech. They have small footprints, because only statistical models are stored on users' computers. And though the voices lack the naturalness of the synthesizers which generate speech by combining segments of the recordings themselves, they are still very intelligible and resemble the speakers who recorded the source material.
Initially, RHVoice could speak only Russian. Now it also supports English, Esperanto, Georgian, Ukrainian, Kyrgyz and Tatar. In theory, it is possible to implement support for other languages, if all the necessary resources can be found or created.
RHVoice supports Windows, GNU/Linux and Android. It is compatible with standard text-to-speech interfaces on these platforms: SAPI5 on Windows, Speech Dispatcher on GNU/Linux and Android's text-to-speech APIs. It can also be used by the NVDA screen reader directly (the driver is provided by RHVoice itself).