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Old October 9th 06, 10:49 PM posted to comp.sys.ibm.pc.hardware.storage,alt.comp.hardware,sci.electronics.equipment,rec.radio.amateur.misc
Dana Dana is offline
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First recorded activity by RadioBanter: Oct 2006
Posts: 49
Default How detect if MP3 player is recording in your room? [OT]


"Joey" wrote in message
...
Suppose someone visited your office or home and tried to make a voice
recording using a hidden recorder.


Tad paranoid here.

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.


Yep

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?


Close. There are devices that are around that do exactly what you want.
Security firms and such use them to verify a room is bug free, etc.