A team from Nacre trying their system out on an offshore oil platform
It’s a problem as old as the protective earplug itself - if you block out the loud, harmful noises, you also block out the quieter sounds, such as peoples’ voices... that is, unless you’ve got a QUIETPRO+ Intelligent Hearing System stuck in your ears. The setup consists of a pair of fairly regular-looking in-ear plugs, wired iPod-style to a small electronic control unit. When the system detects a dangerously-loud noise, it automatically sends noise-canceling sound waves to the headset. When things are quiet, it amplifies sounds like human voices, so the user is actually able to hear better than they would without it.