http://www.bestmp3playerearbuds.com/black-noise/
Why don't engineers create a black box that emits a noise so that it may be easier to detect after a crash?
I thought of this quickly after reading up more about the recent Air France tragedy. They are looking for a box approximately the size of my hand at the bottom of the Atlantic in water that is more than 20,000 ft deep. If the box emitted a sound (a beeping sound at a particular frequency) a sensitive device--used by investigators--could receive the sound, determine its distance, and easily locate it.
The black box DOES create a noise -- but it is a RADIO noise, not an audible one.
RADIO noises are MUCH easier to detect. A properly tuned radio receiver is MUCH more sensitive than the human ear.
Note that ONLY ONE receiver (audio or radio) canNOT determine the direction and distance. You need at least two, and preferably three, such devices in order to "triangulate" the position.
Still, the EXACT position cannot be determined, only an approximate search area. It STILL requires some sort of manual "search and rescue" operation, made much more difficult in this case by the fact that the black box is under several hundred feet of water -- generally, far deeper than a human diver can go.
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