Invention - hypersonic sound
by Marshall Brain
There is a new way to beam sound directly to a person:
Why you might soon think you’re hearing things
From the article:
The technology works by beaming waves of hypersonic sound at a pitch that is undetectable by the human ear. The waves continue until they smash into an object such as a person’s body. The waves then slow, mix and re-create the original audio broadcast. If the person steps out of the waves, they are no longer obstructed and are rendered inaudible.
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