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Old 05-25-2011, 07:08 AM
 
Location: Hopewell New Jersey
1,393 posts, read 6,898,679 times
Reputation: 1010

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Much easier to do now adays with pretty powerfull DSP chips but you're correct..been around for awhile.

One bounces a beam / laser off a window pane. The small vibrations of the window glass modulates the beam reflected off the surface and detectors intercepting the reflection one can evesdrop on the conversation inside the room. In real world though it's a bit more complicated than that. Obviously the sound from local traffic for example "modulates" the window pain much more than the low volume chat inside the room. What can be nowadays, easily done (so I've heard ) is to also bounce another beam off another nearby window with no chat etc. Now you know the sound of the traffic + chat and you know the sound of just the external noise. Processs the two signals,such as the outside noise to cancel out the noise plus chat and what's left is just the chat.

Again, an over simplification but you get the idea. BTW...the laser beams don't have to be in the visible spectrum.

here's another one to ponder...
The sound (acoustic vibrations) in a room also effect light bulbs in the room.As well as other devices) As the bulb, and of course the media inside the bulb "modulate' there is a small effect induced upon the electrical supply going to the bulb. IE...one can (with the right processing of course) listen to a conversation in a room just by evsdropping on the power lines feeding the structure. Again been done years ago...just easier today.

Further reading...
google "Tempest security "...... measures,requirements and the like..




Last edited by JBrown; 05-25-2011 at 07:25 AM..
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Old 06-12-2013, 06:26 AM
 
1 posts, read 1,084 times
Reputation: 10
Default spyware to see interior of house

This actually happened to me, but I'm at a loss as to what type of technology was used. I live in Buffalo, NY, and did not realize that this was taking place until a certain person began to mimic things that I had done in private. i.e. exercising, etc. There are some VERY sick people out there!
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Old 08-10-2013, 10:44 AM
 
1 posts, read 1,012 times
Reputation: 10
I understand your concern... but if they are truly "a bunch of low lifes" as you say... they cannot afford that kind of IR camera. When a lot of IR technicians say they can "see through walls," they don't mean literally all the way through. They are referring to right underneath the surface which is still not technically "seeing" as it is now represented by a bunch of colors and outlines.

So your concern may be a bit different than IR.
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Old 12-15-2017, 09:39 AM
 
Location: Raleigh
8,007 posts, read 5,261,837 times
Reputation: 9641
Quote:
Originally Posted by tripod View Post
<>I've seen that some police and the military have sophisticated + expensive equipment that in effect can see through walls<>
Only in movies and on TV. Oh, and in TSA exam rooms.
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Old 12-16-2017, 08:16 AM
 
6,032 posts, read 1,468,120 times
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There are certain technologies that the public will never be allowed to have access to, mainly for the sake of protecting the level of control and authority Govt has over the people.

the invisibility cloak is a great example, the last I heard they are getting close to having a working model, one that truly bends light and makes it invisible to the naked eye...think a minute about if anyone could go to wally world and buy one of these....that would be disastrous for law enforcement on so many levels!

This same mentality applies to many other new technologies too, in the end, if its a little 'too good' for the people, it will never see the light of day.

There are even regulations in place that actually prevent certain new inventions or technologies from being available to the public if they have any potential to cause problems like this.
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