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On October 23, 2026, Amazon Audible's technical team adopted controllable TTS, using natural language descriptions to control dialogue performance, enabling audiobooks to distinguish narration from dialogue and identify speaking characters. According to information released by Amazon Science the same day, its BookLLM achieved accuracy rates of 97% and 94% in identifying speaking characters across 25 English and Spanish books, respectively, and character dialogue distinctiveness improved by 3.7 points in MUSHRA tests; in English and Spanish tests, eight of ten voices showed statistically significant perceptual improvements. There are currently no subsequent development facts.
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Amazon Audible improves audiobook speech synthesis with controllable TTSDevelopments
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Audible team adopts controllable TTS to synthesize audiobooks
Source:Amazon Science
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Oct 23
Amazon ScienceFirst-party
Amazon Audible improves audiobook speech synthesis with controllable TTS
The Amazon Audible technical team adopted controllable TTS, using natural language descriptions to control dialogue performance, enabling audiobooks to distinguish narration from dialogue and identify speaking characters. Its BookLLM achieved 97% and 94% accuracy in identifying speaking characters on 25 English and Spanish books, respectively, and the distinctiveness of character dialogue improved by 3.7 points in MUSHRA tests. In English and Spanish tests, eight of ten voices showed statistically significant improvements in perceived quality.