Over the decades, there have been many attempts at preventing electronic eavesdropping. The most popular methods employ "white noise" sound masking and ultrasonic jamming. These techniques are aimed at nullifying microphones. While these techniques have their pros and cons, they all share one trait. They target all sounds to all microphones in the area. Not helpful if only one person desires privacy while allowing others to continue communicating using their smartphones, Internet-of Things devices, or hearing aids.
The Department of Computer Science and Engineering, Michigan State University is working on a solution...