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October 10th 06, 03:52 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]
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 as 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. |
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