Extending the idea of voice cancellation headset, I found that automakers already have such system for engines and further working with tires.
http://www.gizmag.com/harman-lotus-halosonic-road-noise-cancellation/34518/
Depends on the cost and real sound effect it is logically to put such ANC to every noise place:
chillers, air conditioners
railway (upper way metro trains)
highway fences,
Building equipment, and so on... on the wall of noisy neighbors ;-)
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