How to build conversational voice bots that feel human using streaming speech-to-text, fast LLM token generation, and neural audio synthesis.
Building a realistic voice agent requires breaking down the end-to-end latency waterfall into three strict budgets: Speech-to-Text (STT, max 150ms), LLM First Token Generation (max 200ms), and Text-to-Speech (TTS First Chunk, max 150ms).
| Stage | Legacy Approach | Modern Ultra-Low Latency Pipeline |
|---|---|---|
| Audio Transport | REST POST .wav file (1200ms) | WebRTC bidirectional stream (<40ms) |
| Transcription | Batch Whisper API (800ms) | Streaming Deepgram / Whisper Live (<150ms) |
| LLM Generation | Wait for complete sentence (600ms) | Streaming tokens with punctuation chunking (<150ms) |
| Voice Synthesis | Synthesize entire paragraph (900ms) | Cartesia / ElevenLabs Turbo stream (<120ms) |
A critical test of voice bots is handling user speech overlap. When voice activity detection (VAD) senses human speech, the client must immediately cancel the active audio buffer and send an abort signal to the LLM generation thread.
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