In this post, we outline why we chose to use TTS instead of human recordings. To some, this approach might seem counterintuitive: shouldn’t people learn by listening to a native speaker? Duolingo uses text-to-speech (TTS) to provide high-quality language education. If exposed to incorrect pronunciation, learners develop their listening and speaking skills poorly, which compromises their ability to communicate effectively. When teaching a foreign language, accurate pronunciation matters. In their own words, “Duolingo is the most popular language-learning platform and the most downloaded education app in the world, with more than 170 million users.” This is a guest post by André Kenji Horie, a software engineer on Duolingo’s Learning Team.
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