Suppose someone visited your office or home and tried to make a voice
recording using a hidden recorder.

If they used a older-style dictation machine based on tape then you
could detect the electromagnetic transmissions from the dictation
machine when it was recording.

But how would you detect if someone was secretly recording with an MP3
player that recorded to flash memory?

Is there some transmission which could be detected?
Perhaps some low power ultra high frequency from chip refresh cycles?

"Joey" wrote in message
...
Suppose someone visited your office or home and tried to make a voice
recording using a hidden recorder.

Tad paranoid here.

If they used a older-style dictation machine based on tape then you
could detect the electromagnetic transmissions from the dictation
machine when it was recording.

Yep

But how would you detect if someone was secretly recording with an MP3
player that recorded to flash memory?

Is there some transmission which could be detected?
Perhaps some low power ultra high frequency from chip refresh cycles?

Close. There are devices that are around that do exactly what you want.
Security firms and such use them to verify a room is bug free, etc.

Joey wrote

Suppose someone visited your office or home and
tried to make a voice recording using a hidden recorder.

If they used a older-style dictation machine based on tape
then you could detect the electromagnetic transmissions
from the dictation machine when it was recording.

In practice that was always a lot easier to say than to do.

But how would you detect if someone was secretly recording
with an MP3 player that recorded to flash memory?

In theory any electronic device will produce some
EM so at least in theory that can be detected.

In practice there is so much of that stuff in any
normal room anyway that its just not feasible.

Is there some transmission which could be detected?
Perhaps some low power ultra high frequency from chip refresh cycles?

Fraid not.

On Mon, 09 Oct 2006 22:23:22 +0100, Joey
wrote:

Suppose someone visited your office or home and tried to make a voice
recording using a hidden recorder.


Ok, why do you care?
Don't have sensitive conversations with anyone you can't
trust, if you're going to be saying anything that shouldn't
be recorded.


If they used a older-style dictation machine based on tape then you
could detect the electromagnetic transmissions from the dictation
machine when it was recording.

Doubtful, and not worth the bother when you could just scan
them or search them physically.



But how would you detect if someone was secretly recording with an MP3
player that recorded to flash memory?

Scan them or search them.
What makes you think you should detect it?
Don't they have a right to a recording of any conversation
they're participating in?


Is there some transmission which could be detected?

Do you mean "wild hypothetical way that some future
technology or extremely expensive equipment and controlled
environment could detect", or do you mean, practically
speaking?


Perhaps some low power ultra high frequency from chip refresh cycles?

.... and you're discriminate this from everything else, all
other HF noise, how? Get a baseline maybe, but noise is
random unless a controlled environment.

You just need to have everyone strip down nude and then do
body cavity searches, X-Rays, exploratory surgery, then
never let them leave so it doesn't really matter if anything
was recorded so long as the environment has sufficient RF
shielding.

On 09 Oct 2006, kony wrote:

On Mon, 09 Oct 2006 22:23:22 +0100, Joey
wrote:

Suppose someone visited your office or home and tried to make a
voice recording using a hidden recorder.


Ok, why do you care?
Don't have sensitive conversations with anyone you can't
trust, if you're going to be saying anything that shouldn't
be recorded.

I say things in my conversation which i do not want to be broadcast in
the public media.




If they used a older-style dictation machine based on tape then you
could detect the electromagnetic transmissions from the dictation
machine when it was recording.

Doubtful, and not worth the bother when you could just scan
them or search them physically.


You say, "search them physically"? I have to tell you that I don;'t
work in the sort of environment where that kind of behaviour is
considered acceptable!



But how would you detect if someone was secretly recording with an
MP3 player that recorded to flash memory?

Scan them or search them.
What makes you think you should detect it?
Don't they have a right to a recording of any conversation
they're participating in?

They have the right to record themselves. I have the right not to have
my words broadcast. Unfortunately obtaining redress can be expensive.
So prevention is beter than cure.


Is there some transmission which could be detected?

Do you mean "wild hypothetical way that some future
technology or extremely expensive equipment and controlled
environment could detect", or do you mean, practically
speaking?

The latter. I am talking practicalitites ere.


Perhaps some low power ultra high frequency from chip refresh
cycles?

... and you're discriminate this from everything else, all
other HF noise, how? Get a baseline maybe, but noise is
random unless a controlled environment.

If necessary I could have my PC turned off and my phone put further
away. But is there any leakage from solid MP3 recorders?



You just need to have everyone strip down nude and then do
body cavity searches, X-Rays, exploratory surgery, then
never let them leave so it doesn't really matter if anything
was recorded so long as the environment has sufficient RF
shielding.

Joey wrote
kony wrote
Joey wrote

Suppose someone visited your office or home and
tried to make a voice recording using a hidden recorder.

Ok, why do you care?
Don't have sensitive conversations with anyone you can't trust,
if you're going to be saying anything that shouldn't be recorded.

I say things in my conversation which i do not
want to be broadcast in the public media.

Then you have a problem for which there
is no solution given the other detail below.

If they used a older-style dictation machine based on tape
then you could detect the electromagnetic transmissions
from the dictation machine when it was recording.

Doubtful, and not worth the bother when you
could just scan them or search them physically.

You say, "search them physically"? I have to tell you
that I don't work in the sort of environment where
that kind of behaviour is considered acceptable!

Then you have a problem.

But how would you detect if someone was secretly recording
with an MP3 player that recorded to flash memory?

Scan them or search them.
What makes you think you should detect it?
Don't they have a right to a recording of
any conversation they're participating in?

They have the right to record themselves. I have the right
not to have my words broadcast. Unfortunately obtaining
redress can be expensive. So prevention is beter than cure.

Sure, but it just isnt practical.

Is there some transmission which could be detected?

Do you mean "wild hypothetical way that some future technology
or extremely expensive equipment and controlled environment
could detect", or do you mean, practically speaking?

The latter. I am talking practicalitites ere.

The short story is that it isnt practical to do what you want to do.

Perhaps some low power ultra high frequency from chip refresh cycles?

... and you're discriminate this from everything else,
all other HF noise, how? Get a baseline maybe,
but noise is random unless a controlled environment.

If necessary I could have my PC turned off and my phone put further away.

Wouldnt be enough given the minimal leakage from a
decently designed solid state MP3 recorder. In spades
with one that has been designed to be undetectable.

But is there any leakage from solid MP3 recorders?

Corse there is, but the level will be so low that you wont be able
to find it with all the other stuff around that is radiating, even if
you turn off everything in your house when a visitor shows up.

You just need to have everyone strip down nude and then do
body cavity searches, X-Rays, exploratory surgery, then never
let them leave so it doesn't really matter if anything was
recorded so long as the environment has sufficient RF shielding.

On Tue, 10 Oct 2006 15:51:51 +0100, Joey
wrote:


If necessary I could have my PC turned off and my phone put further
away. But is there any leakage from solid MP3 recorders?



I'm sure there is a tiny bit, but it cannot be much from
such a small device operating off very low voltage and the
frequency is an unknown variable. it goes back to the idea
about a controlled environment and very expensive equipment,
that you'll probably have more background noise than what's
coming from the recorder, to find it would entail what
amounts to an active search.

Joey wrote in :

You say, "search them physically"? I have to tell you that I don;'t
work in the sort of environment where that kind of behaviour is
considered acceptable!

Would an all nude work environment be acceptable? It would make hiding such
devices difficult so you wouldn't have to do anything untoward like
searching people.

--
ybbxvatyvxrnobeantnvayvivatyvxrnurergvpyvfgravatgb neguheyrrerpbeqfznxv
atnyylbhesevraqfsrryfbthvyglnobhggurveplavpvfznaqg urerfgbsgurvetrareng
vbaabgriragurtbireazragnertbaanfgbclbhabjohgnerlbh ernqlgborurnegoebxra

On Tue, 10 Oct 2006 14:22:57 -0500, Mitch Crane -three
wrote:

Joey wrote in :

You say, "search them physically"? I have to tell you that I don;'t
work in the sort of environment where that kind of behaviour is
considered acceptable!

Would an all nude work environment be acceptable? It would make hiding such
devices difficult so you wouldn't have to do anything untoward like
searching people.

You'd be surprised where people can hide things:

http://www.dailymotion.com/blog/vide...ht.blogs.co m

Caution! NSFW!

max

max wrote in
:

On Tue, 10 Oct 2006 14:22:57 -0500, Mitch Crane -three
wrote:

Joey wrote in :

You say, "search them physically"? I have to tell you that I don;'t
work in the sort of environment where that kind of behaviour is
considered acceptable!

Would an all nude work environment be acceptable? It would make hiding
such devices difficult so you wouldn't have to do anything untoward
like searching people.

You'd be surprised where people can hide things:

http://www.dailymotion.com/blog/vide...yuv3g7lzul2w64
rs1iaad00kom8c0ii3&play=1&referer=http%3A%2F%2Fsus iebright.blogs.com

Caution! NSFW!

Sure, but I don't think the MP3 recorder would work very well in there, so
the point is moot.


--
ybbxvatyvxrnobeantnvayvivatyvxrnurergvpyvfgravatgb neguheyrrerpbeqfznxv
atnyylbhesevraqfsrryfbthvyglnobhggurveplavpvfznaqg urerfgbsgurvetrareng
vbaabgriragurtbireazragnertbaanfgbclbhabjohgnerlbh ernqlgborurnegoebxra