AI headphones create a sound bubble, quieting all sounds more than a few feet away

AI headphones create a 'sound bubble,' quieting all sounds more than a few feet away
 https://www.sciencedaily.com/releases/2024/11/241114161302.htm
Summary:
 Researchers have created a headphone prototype that allows listeners
 to hear people speaking within a bubble with a programmable radius of 3 to 6 feet.
 Voices and sounds outside the bubble are quieted an average of 49 decibels,
 even if they're louder than those in the bubble.

Could be useful!