Er. Not that kind of alt-text. The kind you put on images to assist people who use screen-readers.
I confess I’ve been historically bad at alt-text, though I’m trying to do better and this article helped a lot.
A lot of “premium” hearing aids already do things like this, but the technology is–not to put too fine a point on it–crap. They’re also ridiculously expensive, at upwards of $5,000 per ear.
Hopefully, over the next few years, we’ll start to see more and more consumer lifestyle-level technology put into the devices… and a price-drop wouldn’t go astray, either.