Voice control having where multiple microphones might be listening

A while ago, I came across a project (HA-adjacent if I remember correctly), that showed off a demo in which multiple microphones might be listening for a wake word or speech, and the system would intelligently recognize your distance to each, and would process your command only once.

I can’t find this anymore. Has anyone else seen this?

Also, how are people dealing with this now - is it just having the microphones far enough away from each other?

Willow does that.