As I understand it, active noise cancelling headphones use microphones to pick up the sound around you, and cancel it out. So why can’t the same hardware be used to pick up the sounds around you and amplify them?
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I have a pair of shooting earmuffs that do exactly that; they pick up and play the audio around you back to you, but if they detect a sound over a certain decibel level (like a gunshot) they shut off. You can turn them up higher than normal hearing would allow, so you can have enhanced hearing for hunting.
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