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October 10th 06, 03:56 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]
"Joey" wrote in message
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? On 10 Oct 2006, Ken Maltby wrote: What is done is to generate a pattern of sound, only part of which is audible, and then detect the low level IF and RF that any sound equipment emits. Then follow the signal detected to its source. Luck; Ken Generate a pattern of sound part of which is inaudible? IF and RF? |
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