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active noise cancellation question 

So I’m wrapping up a trip for work, and I had a strange query for folks that travel, especially to the Bay Area.

This trip, I’ve noticed that multiple indoor spaces (my hotel, restaurants, the office building for my employer) now have omnipresent low frequency noise generation. It’s audible to me because my hearing dips in the low range, and noise levels in these closed spaces have notably been reduced.

Is building-scale active noise cancellation now a thing?

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