How is this even remotely new? There have been patents on it since the 90's. A company was trying to commercialize "Silent Sound" back then. For example: US6

How is this even remotely new? There have been patents on it since the 90's. A company was trying to commercialize "Silent Sound" back then. For example: US6052336 Apparatus and Method Of Broadcasting Audible Sound Using Ultrasonic Sound As A Carrier (Ultrasound) Lowery 1998. Holosonics has been selling such systems for a while: https://www.holosonics.com https://www.holosonics.com