Lesson 1784 of 2116
AI Model Families: Pick Speech-to-Text and Text-to-Speech for Latency and Cost
Whisper-class STT and Eleven-class TTS each have tradeoffs in language coverage, latency, and per-minute cost — match to the conversational pattern.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The premise
- 2STT
- 3TTS
- 4round-trip latency
Concept cluster
Terms to connect while reading
Section 1
The premise
Voice apps live or die on round-trip latency; the model with the best transcription accuracy may not be the one that finishes in 300ms.
What AI does well here
- List candidate STT and TTS models
- Score on latency, accuracy, and per-minute cost
- Match to use case (live agent vs async transcription)
- Note language coverage gaps
What AI cannot do
- Replace user testing for naturalness perception
- Account for telephony codec quality
- Predict provider availability in your region
Key terms in this lesson
End-of-lesson quiz
Check what stuck
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