Ultrasonic Tracking: Are our phones really listening to us?
Twenty Thousand Hertz
Using Ultrasonic Communication to Make Your Life Easier
Lawsuits against ultrasonic communication companies have been popping up a lot lately. These apps use your phone's microphone, so it's easy to see that this could be compared to wiretapping. Listener describes their technology as data over audio. The FCC says that all audio up to 21,000 kilohertz is safe audio.
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