Why does a text-to-speech (TTS) system trained primarily on standard American English often mispronounce words in Hiberno-English (Irish English) accents?

💡 Explanation

TTS systems struggle with Hiberno-English because accent-specific phoneme mappings, which dictate how graphemes relate to sounds, are absent. The TTS relies on its existing mappings; therefore, it mispronounces words rather than correctly applying the Hiberno-English accent's unique phonetic rules. Statistical overfitting or model inadequacies are less direct causes.

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