RAG Explained: How Retrieval-Augmented Generation Keeps Enterprise AI Honest
A non-jargony explanation of retrieval-augmented generation for enterprise buyers, with examples of how RAG prevents hallucinations in voice AI.
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Technical
Presence Detection: Why Great Kiosks Greet You First
Proactive greeting changes everything about a kiosk. Here is how presence detection works and why it lifts engagement so dramatically.
Walk up to most kiosks and nothing happens. You have to figure out the interface, find the button, and start. That tiny moment of friction is where the majority of potential interactions quietly die. Presence detection removes it by letting the kiosk notice you and speak first.
The psychology of the first move
A machine that waits feels like work; a machine that greets feels like service. When a kiosk says "Hi — can I help you find something?" the moment you approach, it gives implicit permission to engage and demonstrates, in one sentence, that talking to it is normal and easy. Engagement rates rise sharply when the system initiates.
How presence detection works
- Sensing. Depth sensors, cameras, or proximity sensors detect a person entering the interaction zone.
- Intent estimation. The system distinguishes someone approaching to engage from someone walking past.
- Activation. It triggers a greeting — no wake word, no tap — and starts listening.
- Reset. When the person leaves, it returns to an ambient state, ready for the next visitor.
Getting the trigger zone right
Tuning matters. Too eager and the kiosk greets everyone walking past, becoming annoying background noise. Too shy and it misses people genuinely seeking help. The art is a trigger zone that matches how people actually approach in that specific space — which is why on-site tuning beats factory defaults.
A proactive greeting is the cheapest, highest-impact upgrade you can make to a self-service experience. It converts hesitation into a conversation.
Privacy done right
Presence detection should sense that someone is there, not identify who. Good systems use presence signals to trigger interaction without storing biometric identity, and are transparent about it. Ask vendors exactly what is sensed, what is stored, and for how long.
Why it pairs with voice
Presence and voice are made for each other: presence removes the friction of starting, and voice removes the friction of interacting. Together they create something closer to a helpful person than a machine — which is exactly what a lobby or concourse needs.
Takeaway: Kiosks that greet first win. Presence detection turns a passive screen into a proactive host — tune the trigger zone on site and keep it privacy-respecting.
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