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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You just described hearing aids. That’s exactly what they do, only they are calibrated to certain frequencies depending on the hearing loss in the individual. But in essence they are like a personalized noise cancelling/sound amplifying headphone.
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