Darren New wrote:

> http://denbeste.nu/special/cdma_spreading.html
> 
> Not magic, but certainly very difficult to understand intuitively.

Hey, neat.

So it's kind-of like this?

http://en.wikipedia.org/wiki/Visual_cryptography

I'm still trying to figure out exactly how it works, but it's quite neat.

And now I'm wondering... can you implement this stuff using only 
analogue electronics? My first instinct is "how the hell do you compute 
signal correlation without a computer?" but now I'm thinking maybe you 
can do it with some op-amps. The only real problem would be getting 
sender and receiver to generate the same psuedo-random reference signal, 
and keep it synchronised.

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