Researchers have designed a sound that is completely inaudible to humans (40 kHz or above) yet is audible to any microphone. The sound combines multiple tones that, when interacting with the microphone’s mechanics, create what researchers call a ‘shadow,’ which is a sound that the microphones can detect.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/06/170623100433.htm
via Tumblr http://ndbasilica.tumblr.com/post/162279928424
No comments:
Post a Comment