I don’t think active noise cancellation can work like you are hoping. Active noise cancellation works for a target location (your ear’s location) not for a general area. It works by wave superposition cancelling out the wave for the target location. But the waves won’t cancel at any other location.
It can work like that in principle,
if you have several microphones and emitters, though most practical implementations do focus on canceling at a certain point in space, as you mention.
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I don’t think active noise cancellation can work like you are hoping. Active noise cancellation works for a target location (your ear’s location) not for a general area. It works by wave superposition cancelling out the wave for the target location. But the waves won’t cancel at any other location.
I think you want something more like metamaterials that can be put on walls for homes and offices. Like https://www.smithsonianmag.com/innovation/new-material-acts-...
It can work like that in principle, if you have several microphones and emitters, though most practical implementations do focus on canceling at a certain point in space, as you mention.
Meta materials look very cool, thanks for sharing!