Joey wrote in :

On 10 Oct 2006, Slow Code wrote:

Joey wrote in
:

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?


There probably is a little electro magnetic energy leaving the
device, but what frequency would you try to find it on? Other
electronic things such as computers, printers, etc in the office
most likely emit far more RF noise than the MP3 device. It would be
hard to find it. Eventually, the power would run down and the
thing would stop recording. Someone would have to come by again
and pick up the recorder. So your best bet is to be on the lookout
for any suspicious recorder placement and pick up activity.

Or just buy a stereo for your office and play it real loud all the
time.

Maybe belch and fart a lot too.

SC

The situation I describe is where the MP3 plater/recorder is carried
by the person.


Well in that case, the farting and belching should work to keep them away
and presto, no recordings, but you'll have to live with the stinky smell.

SC