There was a whole wave of interest in this space in 2014. I believe @kategeek did the first easy-to-use library with Quietnet ;) https://github.com/Katee/quietn

There was a whole wave of interest in this space in 2014. I believe @kategeek did the first easy-to-use library with Quietnet ;) https://github.com/Katee/quietnet https://github.com/Katee/quietnet Some other material on the subject: - http://www.whence.com/minimodem/ http://www.whence.com/minimodem/ - https://quiet.github.io/quiet-js/ https://quiet.github.io/quiet-js/ - https://courses.csail.mit.edu/6.857/2014/files/05-li-lynch-zhao-covert-acoustic-channels.pdf https://courses.csail.mit.edu/6.857/2014/files/05-li-lynch-z... - https://www.ghacks.net/2014/01/09/ultrasonic-communication-chat-client-using-sound/ https://www.ghacks.net/2014/01/09/ultrasonic-communication-c... - https://smus.com/ultrasonic-networking/ https://smus.com/ultrasonic-networking/ - https://arstechnica.com/tech-policy/2015/11/beware-of-ads-that-use-inaudible-sound-to-link-your-phone-tv-tablet-and-pc/ https://arstechnica.com/tech-policy/2015/11/beware-of-ads-th...