It is much easier to cancel noise right at the human ear than it is at the source of the noise.
But even that wouldn’t work well since infra-sound vibrates the body and organs. It can cause eyeballs to resonate and can cause people to see ghost-like images.
“But even that wouldnt work well”
Oh well,
Guess I better not give up my job as a wallmart greeter... /s
BTW, it WOULD take care of the vibrations, and didn’t they use something like this on car exhausts?