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'[OT]: Communicating secretly'
2003\04\08@111855 by Andrew Seddon

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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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2003\04\08@123115 by Bob Blick

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Andrew Seddon said:
> 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 don't know, if the game show staff can figure out coughing as signals,
they ought to be able to spot the electronics even easier, they are
probably looking pretty closely now  :)

-Bob

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2003\04\08@135956 by Andre Abelian

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Sorry I do not have any idea for you.
Sounds like FBI project I like it. Let me know if
You came up with any solution. I am sure even you
Make some thing that works after 5 years they will
Report that your device thru the teeth cases cancer
Or some thing else.

Andre.

{Original Message removed}

2003\04\08@152655 by Robert Ussery

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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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2003\04\08@152944 by H. Carl Ott

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Look into loop induction earphones, been around for years.
 Just one link:
http://www.hearing-loss-help-co.com/index.htm?371.htm&1

-carl

At 03:08 PM 4/8/2003, you wrote:
{Quote hidden}

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2003\04\08@153330 by Gary L. Batchellor

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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.
{Original Message removed}

2003\04\08@153928 by Johnathan Corgan

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Bob Blick wrote:

> I don't know, if the game show staff can figure out coughing as signals,
> they ought to be able to spot the electronics even easier, they are
> probably looking pretty closely now  :)

A bunch of 0403/SOT323s forming a stripline receiver embedded in the
frame of some geeky looking eyeglasses, with a miniature piezo to
vibrate the dits and dahs of high-speed morse?

-Johnathan, AE6HO

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2003\04\08@162658 by John Ferrell

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Thomas Edison solved this problem by teaching his girlfriend morse code and
communicating with hand squeezes!
It got by the chaperones of th day...

{Original Message removed}

2003\04\08@164948 by hard Prosser

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When I worked for Motorola in the late 70's, they had a system using an
inductive loop pickup inside the ear, with a  loop worn under a jacket and
mounted on top of the shoulder.
The microphone was, I think, either worn on the lapel or on the sleeve.
The radio was held in a "shoulder holster" type arrangement that took us
quite a while to figure out how to put on!

The earphone fitted well inside the ear and had a small pin sticking out of
it that had to be used for retrieval.

Richard P




{Original Message removed}

2003\04\08@175314 by Johnathan Corgan

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Gary L. Batchellor wrote:

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

Man, does that bring back memories...I had one of these things in junior
high school (let's see, that was when I was 12, way too many years ago.)

It fit well under my jacket and I'd listen to tunes in study hall.  It
didn't quite work as advertised--there was still some sonic energy
travelling directly from the speakers to the ears--but it was
surprisingly "hi-fi" even though much of the sound was indeed conducted
through skin/bone.

I finally did get busted when the study hall monitor noticed me reaching
under my jacket to adjust the volume/tuning :=)

-Johnathan, AE6HO

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2003\04\08@200924 by Russell McMahon

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> 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).

Does it have to use speech?
eg is some sort of code acceptable?
If so then Morse or similar would allow telemetry to numerous other places
on the body with mechanical or electrical signal transfer.

Can it be visual - creation of a virtual image either within the frame of
spectacles or superimposed on the lense area would be doable. A very small
text image can be focussed on at very short range with suitable diopter
lenses.

How does the signal get to the recipient?
if it must be dome wirelessly then a 2 stage process seems liable to be
needed. First stage is to receiver proper worn somewhere on the body and
second stage is a wireless short range link to the person interface.

You MAY be able to induce audio within the brain at an appropriate location
using suitably strong magnetic signals. Finding a volunteer for testing may
be problematic :-).

I suppose subcutaneous insertion is out ? :-)
This would arguably be the most viable means for non detectable speech
reception. Given the difficulty in finding a reliable Plutonium supplier and
the annoyance of carrying that much shielding you may consider charging
using inductive power transfer. "Can't hear me? Quick - suck this
electromagnetic lozenge".
Or power could be by mechanical means - chew on a piezo disk or small
alternator. ("He seems to chew a lot when he's thinking." )

Back to work !!!


       Russell McMahon

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2003\04\08@202827 by Jinx

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>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)

At least it's a bit more subtle than pretending to have mild TB ;-)

http://news.bbc.co.uk/1/hi/uk/2910119.stm

I like this one too

http://news.bbc.co.uk/1/hi/england/west_midlands/2918417.stm

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2003\04\09@095325 by Micro Eng

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I thought....in the UK somewhere...they were embedding cell phone
mic/speakers in teeth?






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>{Original Message removed}

2003\04\09@220315 by Doug Butler

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Look into communications gear for divers.  There is something called a "bone
phone" that is a small speaker like thing placed between a wet suit hood and
the skull to hear telephone signals underwater.  It might work for you.

Doug Butler
Sherpa Engineering


> {Original Message removed}

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