Unverified50% confidenceFactExact time
The industry typically uses Time to First Audio Chunk as the core metric for real-time TTS.
1
Sources
50%
Confidence
Long-term
Relevance
10/2/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedAn RTF (Real-Time Factor) of less than 1 means the system processes faster than the audio playback speed, which is the baseline threshold for achieving truly real-time transcription.73% similarUnverifiedTime to First Audio (TTFA) refers to the time elapsed from text input to the output of the first frame of playable audio, and is a core metric for measuring the response speed of streaming TTS systems.72% similarUnverifiedAcoustic model inference is the primary source of TTS latency.70% similarVerifiedThe three-stage architecture of traditional voice interaction (ASR+LLM+TTS) typically has a total latency of 1–3 seconds.69% similar
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