This note suggests that in the usual way, an audio modulated ultrasonic acoustic wave is inaudible to the ear, but audible to the usual microphone, such as yours.
Brian W
Secret Ultrasonic Commands Can Control Your Smartphone, Say Researchers
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Secret Ultrasonic Commands Can Control Your Smartphone, Say Researchers
Voice-controlled digital assistants are increasingly common and sophisticated. Google, Apple, Amazon, numerous c...
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On Friday, October 9, 2020, 01:35:59 AM CDT, bernard cleyet <bernard@cleyet.org> wrote:
A friend reminded me of a demo. at the Naval Postgrad. School, wherein an ultrasonic speaker generated wave is voice modulated in order to produce a rather narrow bean Tannoy. I presume it works by the ear’s being non-linear in amplitude response. Any idea if it would work W/a hearing aid that has no gain above about 8k Hz?