"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.

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 14:37:33 -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.

"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.

On Fri, 13 Oct 2006 19:39:11 -0800, "Dana"
wrote:


"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.



No, you can detect semiconductor junctions then, but not the
identity, nor function, of what larger device you have
detected as having semiconductors.



Now how about the phones that can record?

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

Again, we are not merely trying to detect some arbitrary
substance, it has to be a complete detection that
discriminates a recording MP3 player. If all we cared about
was that "something" was there, we have no need to consider
semiconductor presence at all.


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

Semiconductor junctions can be detected today.

Again, it's pointless.




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.

You seem unable to describe any way to discriminate the very
thing this thread is about.


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.

Ok, but again, it doesn't tell us the purpose of common
items like plastic, or semiconductors. Explosives aren't
going to be used in practically everything that plugs into a
wall or takes a battery.

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.

Maybe some, but not all will give off a magnetic field. It
doesn't matter though, there is nothing in particular in an
MP3 player that would discriminate it from a cell phone. Is
it not obvious to you that common items people are allowed
to have, can't be false detected? Perhaps whoever is
subject to this search is first told to empty all pockets of
such things, but as already written, we'd need to know such
a scenario to delve into this kinds of tangents.

Now your sensor
emits a magnetic field, and the reciever looks for the signature of the
explosives.

Great, if a recording MP3 player is made out of explosives.

You seem to have trouble distinguishing between random
non-applicable information and the crucial details necessary
to discriminate a recording MP3 player.


So it is only a matter of expanding your signature library, and your
receiver can be programmed to look for pretty much anything.

Nope, and you might as well stop pretending you know about
this stuff because you have pretty well given yourself away.
There is no one signature an MP3 player would have, it's not
made of one unique material and there are myriad different
players with different % of several materials, but
practically all of them are commonplace, unlike explosives.


This is only one of many new tools that are out.
The semiconductor junction detector has been out for around 30 years.

Show one recording MP3 player having been detected like
this, anyone who claims they have a specific device that
does it and can explain how- because it sure as heck isn't
using a signature like with explosives.

"kony" wrote in message
...
On Fri, 13 Oct 2006 19:39:11 -0800, "Dana"
wrote:


"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.



No, you can detect semiconductor junctions then

And mp3 players have semiconducter 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.

Again, it's pointless.

No, it will tell the OP that electronic devices that can may be able to
record his converstaionare present.




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.

Ok, but again, it doesn't tell us the purpose of common
items like plastic, or semiconductors. Explosives aren't
going to be used in practically everything that plugs into a
wall or takes a battery.

But the signatures of plastic, batterues can be put into a library and the
scanner will then alert you of there presence.


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.

Maybe some, but not all will give off a magnetic field.

It is not the magnetic field that is being detected, it is the signature
emitted when exposed to a magnetic field. IE when the molocules return to a
normal state, they emit a signature.


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.

Nope,

Yep


This is only one of many new tools that are out.
The semiconductor junction detector has been out for around 30 years.

So it can tell semiconductor junctions of an MP3 recorder from semiconductor
junctions of non-recording devices?

Th OP question was detection not *any* semiconductor device, but a MP3
recorder. By the way, the recorder doesn't have to be in that room. Enough
to have a connected cellphone in a pocket.


"Dana" wrote in message
...


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.

"Alexander Grigoriev" wrote in message
link.net...
So it can tell semiconductor junctions of an MP3 recorder from
semiconductor
junctions of non-recording devices?

Th OP question was detection not *any* semiconductor device, but a MP3
recorder. By the way, the recorder doesn't have to be in that room. Enough
to have a connected cellphone in a pocket.

Yep, and that can be detected.
What you do with the knowledge that the person has an electronic device that
may or may not record is up to you and what you want to do.

Hogwash.

MRI detects primirily concentration of hydrogen atoms. It requires quite
strong magnetic field with precise gradient. What you describe is using
different principles.

"Dana" wrote in message
...


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.