Full-duplex voice AI can listen and speak at the same time, closer to a natural telephone conversation than systems that alternate between fixed listening and speaking phases. It lets a caller interrupt, correct, or acknowledge the agent while audio output continues, but requires careful echo control and turn coordination.
How does full-duplex conversation work?
The system continuously captures input while generating and playing output. It must separate the caller’s voice from its own audio, then decide whether new speech is a brief acknowledgement, background sound, or a real interruption. Noise suppression, echo cancellation, voice activity detection, and streaming generation work together.
When does full duplex improve a voice agent?
It matters in fast, collaborative conversations where callers say “yes,” correct a detail, or change direction mid response. Barge-in should stop or redirect output only when the new speech changes the turn. For simple announcements, half duplex may be more predictable. Evaluate full duplex with overlapping speech and real phone acoustics before treating it as a feature of production voice agents.
Frequently asked questions
What is the opposite of full-duplex voice AI?
Half-duplex systems separate listening and speaking, so one side must stop before the other can begin.
Why is full-duplex voice AI difficult?
The system must distinguish the caller from its own playback, detect meaningful interruptions, and avoid talking over short acknowledgements.
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