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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Lots of them do use the same technology to simply repeat ambient noises louder, but the trick is that hearing loss isn’t always just a volume problem. Some people have problems with specific frequencies or ranges of frequencies, and a good hearing aid will target *just those problem areas* for the patient.
The quality of cheap hearing aids (that rely on the same tech as noise-cancelling headphones) has risen significantly in the last 5-10 years.
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