"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

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.

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.

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.

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.



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.
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.

Random ideas that "something" similar is possible is not
same as application in a specific scenario.



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. A hint, but not a full scenario might include something
like what happens if "something" is detected, both the full
purpose and result.



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. That some fields can be
detected, that it can be known if something is running, is
not same thing as knowing a digital recorder is running.
This difference is quite important in many scenarios because
OTHER types of devices are far more common in modern society
than digital recorders.

"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.