Remember reading an article a while back where they said they did it. Can’t find it but never really explained how it is even possible or how or why someone said look light lets put some data in itl
Remember reading an article a while back where they said they did it. Can’t find it but never really explained how it is even possible or how or why someone said look light lets put some data in itl
Just consider Morse code, only it happens way, way faster than than you can perceive.
Think about the last time you saw LED tail lights on a car that seemed to leave after images when your eye moved.
That’s because those LEDs aren’t actually solidly lit but are flickering so fast that they seem to be just constantly on. Some older versions that flicker happened just slow enough that you can perceive it during rapid eye motions.
You can speed up that flicker fast enough that a very long Morse code message, book length even, could be transmitted in less than a second.
Add in “encoding” where a given short series of flickers stands not for a single letter but for a particular series, with a huge “alphabet” of these codes, and you start getting into the realm of rapid data transfer.
Old phone-style modems worked this way but with sound blips instead of light.