TTS Evaluation measures the quality of speech produced by a text-to-speech (TTS) system — its naturalness, intelligibility, pronunciation and expressiveness. It combines subjective listening tests scored with Mean Opinion Score (MOS) and objective acoustic metrics, often alongside latency measurements.
For Voice AI, how an agent sounds shapes how human and trustworthy it feels. Evaluating naturalness, prosody, pronunciation of names and numbers, and synthesis latency ensures the voice stays clear, expressive and fast enough for real-time conversations rather than sounding robotic or laggy.