Click link to see YOUTUBE VIDEO Source: https://www.youtube.com/watch?v=KjsT_s5eWhI
Directional Speakers – Source: https://www.holosonics.com/retail
How to Build a Speech-Jamming Gun
Japanese researchers build a gun capable of stopping speakers in mid-sentence.
Dream-shaping tech from MIT channels suggestions into your dreams
2012 SpeechJammer: A System Utilizing Artificial Speech Disturbance with Delayed Auditory Feedback – click on PDF Link