Imagine this scenario. You're sitting in the living room watching TV. In a chair nearby, someone is listening to music, and in the hall, someone else is listening to the radio. Sound like a recipe for noise pollution? Maybe not.
The "Audio Spotlight" aims to beam sound in such a tightly focused way, that people nearby can't hear it at all. There's an example of the audio spotlight used with an advertising billboard in Manhattan right now.
Here's the unedited interview I did with Joe Pompei, president and founder of the company behind the Audio Spotlight.