I have an applicaton where I would like to be able to talk to somebody
(remotely via radio). However I would like nobody around them to hear what
is being said. Also it should not be noticable that they have any sort of
hearing device on(e.g headphones).

I thought about using bone transmission of sound. You could give them a
little ball with a speaker inside it and when they want to hear they bite
the ball and the sound travells through the teeth into the ears.

Anybody know anything about this or have any other ideas??

Cheers.





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