There was a device marketed called the "bone fone" that fit over the =
shoulders and transmitted the sound directly into the body. As I =
remember it was marketed specifically for those wanting to listen to a =
radio without "annoying" those around them.=20

-----Original Message-----
From: Robert Ussery [mailto:uavscience@FRII.COM]
Sent: Tuesday, April 08, 2003 2:24 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: Communicating secretly


Well, I would think that a flesh colored "ear-bud" would be less visible
than someone walking around with wires hanging out of their mouth!! :o)

How about a short range RF link from the a belt-worn voice radio to a =
tiny
RF hearing-aid-like device? Many modern hearing aids (while costing =
>$1000)
are invisible, except upon close inspection. It might be possible to gut =
the
amplification circuits and replace them with a single-chip RF receiver.

How about a baseball cap with a speaker in it, doing the same thing as =
the
mouth-ball idea (transferring the sound through the skull? I'm not sure =
that
the volume required to transmit the sound through the skull wouldn't =
result
in some noise emission as well, though. Hmmm... Difficult problem.

- Robert

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