What do you call that!!!?

[electronic mind]

I heared once that there are some kind of Mic. that can catch the sound waves from someone who is talking in a distance of 10m or even more and by connecting the mic to a headphone you hear what that someone is saying .... is it applicable and if it is what is it called?? (Sonic Mic,, Directional Mic,....)

and does anyone knows a site that cntains a schematic or some info

 

[David Bridgen]

The microphones to which your refer use a reflector behind them, like the reflector behind a microwave antenna.

Google for "parabolic microphone" or "spy mic" or "eavesdropping mic".

 

[zachtheterrible]

as far as i know, there are two mics like this. the parabolic mic, like David said, and there is also the shotgun mic, which is a long mic with a bunch of different lengths of tubing in it that are (and i don't know if this is the right term) resonant for a certain frequency. so you have different tubes, each one that amplifies a certain frequency, so you can have a range of like 100HZ-5KHZ (that is totally guessed, just an example)

search for more info on google.