How long before we see USG contracts issued to buy these?
Here is the $$$ quote from the developers.
To use the researchers' words: "We have to establish and obey rules for proper turn-taking when speaking.via CNET
Yes, it's a politeness enforcer.
Some Japanese researchers--Kazutaka Kurihara at the National Institute of Advanced Industrial Science and Technology in Tskuba and Koji Tsukada at Ochanomizu University--have created the perfect solution for this painful dilemma: a gun. No, they're not suggesting you go Dirty Harry on those who annoy you.
Instead, this appealing firearm jams the vocal output of the unwanted up to a distance of 100 feet.
The technology behind it is deafeningly simple. The gun listens in with a directional microphone and plays it back to them with a 0.2 second delay. This creates an environment in which one is simply unable to speak. The technical term for this is Delayed Auditory Feedback.