There is concern that people who listen to personal stereos are doing danage to their hearing.
Today’s invention is a set of earphones which periodically require the user to undertake a hearing test.
A range of tones would be played to the wearer and they would record hearing each by tapping on the outer of one earpiece.
This response would be recorded, allowing a personal profile of hearing sensitivity to be created.
This would then be used to modify the earpiece outputs so that hard to hear elements for each ear would be boosted (whilst always keeping the volume below a damaging level for the individual).