Comment by Anduia

US military showed a version in 2012 [1], and there is a DARPA report[2]

That said, it's a solid student project. I'm sure she'll do well at university.

[1]: https://www.ifsecglobal.com/uncategorized/soundwaves-a-new-p...

[2]: https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20...