How detect if MP3 player is recording in your room? [OT]

On Thu, 12 Oct 2006 19:15:03 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Thu, 12 Oct 2006 16:48:32 -0800, "Dana"
wrote:


You man there actually is something which will detect MP3 recorders?

There are devices that can detect when electronic devices are being used.
There are devices that can be made that can detect almost any known
material
If said mp3 player is made of that material it can be detected.



Which is not entirely applicable, since plenty of
non-recorders are made of circuit boards, ICs & other
discretes, and some plastic. Cell phone and pager are two
quite common ones.

And what is a common item to circuit boards, IC's, cell phones, pagers, MP3
players, etc.

Yes, which is one of the reasons why detection of these
won't help, unless ALL such devices are banned which is
unlikely... but again, we dont have the specific scenario to
consider.


There are devices made to detect the presence of semiconductors, and these
have been out for ages.
And now with the war on terror going on, you would not believe what kind of
sensors they are coming up with.

I would believe you are taking a random unfounded
presumption that someone "could" be possible without
supporting evidence, nor consideration of what would be
necessary to distinguish this particular device.

Minor modifications of some of these units would not be very difficult to
detect a mere MP3 in someones pocket.

Unfounded speculation. "Maybe" it's easy enough to detect
the device when turned off. "Probably" if you were close
enough to the device you could even detect that it's turned
on. That's a far cry from identification as an MP3 player,
let alone one that is recording, vs another mode of
operation (like playback, wouldn't it be highly possible
someone who has an MP3 player, would have it to play MP3?)

But then these would not be cheap either, if you can even get one.

Establish that such a device exists at all, that can detect
an MP3 player recording, specifically discriminate it from
other devices. Nevermind if we can buy it or how much it
costs, establish that it can be done at all as so far you
have not.

"kony" wrote in message
...
On Thu, 12 Oct 2006 18:43:46 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Thu, 12 Oct 2006 16:48:32 -0800, "Dana"
wrote:


You man there actually is something which will detect MP3 recorders?

There are devices that can detect when electronic devices are being
used.
There are devices that can be made that can detect almost any known
material
If said mp3 player is made of that material it can be detected.



Which is not entirely applicable,

Sure it is

Nope, not without the scenario.

Sure it is.



since plenty of
non-recorders are made of circuit boards, ICs & other
discretes, and some plastic. Cell phone and pager are two
quite common ones.

Yep, and all are detectable, and all have signatures.

You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.



The scenario has not been defined enough to know if the
device will be turned on within the distance of the
scanner/other detection device.

To detect semiconducter junctions the operating state of the device being
measured is not important.


Detecting electronics devices in general, is it useful?

Depends on who you ask
The OP is not the only one who wants to ensure no one is able to record
conversations, or hear conversations they should not be hearing.

We
dont know the exact scenario,

He gave the scenario.


No.

The scenario was presented with enough detail.




what the result would be of a
positive detection but as above, cell phones and pagers
would tend to be caught and are going to be far more common
and innocuous than a recording device, though in the former
case, the phone may have recording capability too.

True enough, but the technology is there to do what is being requested.
Now
if the OP can afford it, or even obtain it is a different issue.

You have not established this.


Your lack of knowledge of the systems involved is not my problem.
The technology does exist to do what the person wants.
Now how large this equipment is, and how much it costs, and even if it is
available to us regular joe blows is something different.

"kony" wrote in message
...
On Thu, 12 Oct 2006 19:15:03 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Thu, 12 Oct 2006 16:48:32 -0800, "Dana"
wrote:


You man there actually is something which will detect MP3 recorders?

There are devices that can detect when electronic devices are being
used.
There are devices that can be made that can detect almost any known
material
If said mp3 player is made of that material it can be detected.



Which is not entirely applicable, since plenty of
non-recorders are made of circuit boards, ICs & other
discretes, and some plastic. Cell phone and pager are two
quite common ones.

And what is a common item to circuit boards, IC's, cell phones, pagers,
MP3
players, etc.

Yes, which is one of the reasons why detection of these
won't help, unless ALL such devices are banned which is
unlikely... but again, we dont have the specific scenario to
consider.

Depends on the OP, his office can ban those items in the work place.
The point remains they are detectable.


There are devices made to detect the presence of semiconductors, and
these
have been out for ages.
And now with the war on terror going on, you would not believe what kind
of
sensors they are coming up with.

Minor modifications of some of these units would not be very difficult to
detect a mere MP3 in someones pocket.

Unfounded speculation.

Nope.

But then these would not be cheap either, if you can even get one.

On Fri, 13 Oct 2006 14:42:49 -0800, "Dana"
wrote:


The point remains they are detectable.



You mean the point you never made.

On Fri, 13 Oct 2006 14:37:33 -0800, "Dana"
wrote:


You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.


What "it"?

MP3 players recording?

I doubt it, show us even a complete theoretical description
of it being possible including the readings from such a
demonstration... let alone a purpose built device that
exists for this purpose.

"kony" wrote in message
...
On Fri, 13 Oct 2006 14:42:49 -0800, "Dana"
wrote:


The point remains they are detectable.



You mean the point you never made.

Electronic devices made the point.
They exist, you may not be aware of them, but that is your issue.

"kony" wrote in message
...
On Fri, 13 Oct 2006 14:37:33 -0800, "Dana"
wrote:


You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.


What "it"?

Devices are being discriminated by their signature.
Various sensors are doing this.

On Fri, 13 Oct 2006 16:40:03 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Fri, 13 Oct 2006 14:37:33 -0800, "Dana"
wrote:


You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.


What "it"?

Devices are being discriminated by their signature.
Various sensors are doing this.

Do you know how many MP3 players are out there?

Now how about the phones that can record? A theory about
what might be possible someday, is not same thing as what IS
being done today.

You seem to be vaguely claiming it's possible without really
considering EXACTLY what is necessary.

On Fri, 13 Oct 2006 16:37:24 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Fri, 13 Oct 2006 14:42:49 -0800, "Dana"
wrote:


The point remains they are detectable.



You mean the point you never made.

Electronic devices made the point.
They exist, you may not be aware of them, but that is your issue.

It's not my issue to claim detection of different devices
proves detection of an MP3 player recording. Rather, it is
your burden to be specific with the claim that it's possible
by showing even one reproducible example.

We have no reason to believe a scenario like the OP has (too
vaguely) posed, would allow identification of a device as an
MP3 player that is recording. Identifying the existence of
"some" kind of device, then a search uncovering this device
and a physical examination to determine that it is recording
(looking at the screen or lights) is another matter.

"kony" wrote in message
...
On Fri, 13 Oct 2006 16:40:03 -0800, "Dana"
wrote:


"kony" wrote in message
.. .
On Fri, 13 Oct 2006 14:37:33 -0800, "Dana"
wrote:


You have not established that the signature (difference) of
such a device can be discriminated from a different device.

It is being done today.


What "it"?

Devices are being discriminated by their signature.
Various sensors are doing this.

Do you know how many MP3 players are out there?

Yeah, so what. There are devices that can detect semiconducter junctions.
MP3 players have semiconductor junctions, hence they can be detected.


Now how about the phones that can record?

They also have semiconductor junctions, hence they can also be detected.


A theory about
what might be possible someday, is not same thing as what IS
being done today.

Semiconductor junctions can be detected today.

You seem to be vaguely claiming it's possible without really
considering EXACTLY what is necessary.

Hogwash.
You seem not to understand what can be done with electronics.
There are some devices that use the priciples of a MRI and shrink it down to
a hand held sized device to scan for explosives. Since the compounds in
explosives give off a unique signature after being exposed to a strong
magnetic field, that signature is then stored in memory. Now your sensor
emits a magnetic field, and the reciever looks for the signature of the
explosives.
So it is only a matter of expanding your signature library, and your
receiver can be programmed to look for pretty much anything.
This is only one of many new tools that are out.
The semiconductor junction detector has been out for around 30 years.