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October 11th 06, 08:03 PM
posted to comp.sys.ibm.pc.hardware.storage,alt.comp.hardware,sci.electronics.equipment,rec.radio.amateur.misc
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How detect if MP3 player is recording in your room? [OT]
Jamie t wrote:
Arno Wagner wrote: In comp.sys.ibm.pc.hardware.storage 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. 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? Not really. You could maybe detect that it was turned on with an RF scanner. But if it is low power enough (most MP3 players are, since they are optimised for that) and well shielded, you would likely get nothing in today's RF polluted environment. In addition the attacker may just add some more shielding to be sure. I think you can basically forget about this, unless you can take the devices away from people. Arno i have seen a device used by an electrical instructor at a trade school. he does not like any Cell, recorders or electronic devices active while in his class. this device will buzz and vibrate in his pocket as he walks around the class, he can walk right up to the student that has something on.. it works by detecting a variation of known R.F. frequencies that helps him decide on an LCD screen of the device what it could be, and then it has wide band detection of any R.F. generation.. as you know, most devices do generate some R.F. of some freq.. i've seen it in use and its on the market... all i can say is by his words, "it works very good" Trouble is that he cant know about the devices his doesnt detect. |
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