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Margaret,Brothers and Sisters, a friend who occupied a fairly high-level
I have seen internet discussion of the method.
There is some doubt in my mind as to whether success depends on
a perpendicular view of a single-glazed glass pane, or if
audio can also be extracted from oblique laser views of windows.
What is certainly well-established is an Eastern Bloc substitution
at the height of the cold-war for a US wall emblem mounted on the
wall of a secure room.
This provided a passive microwave cavity with a flexible diaphragm
and a little monopole antenna.
When illuminated by an external microwave beam, a return signal
was modulated by any sound available in the room.
This illustrates the general principle.
Brian
At 22:36 12/26/97 +1100, you wrote:
Does anyone out there more knowledgable than me (and that's not hard)
know if the followingtype
technique is for real or is an urban myth: that industrial-espionage
sensors exit which can reconstruct an internal conversation from thebrian whatcott <inet@intellisys.net>
remotely-sensed vibrations of a room window?
If it is genuine, how is it done in practice?
Cheers and Christmas Greetings to all
Margaret Mazzolini
Altus OK