>>qqqqqu+(OP)
Fourier Transforms. I'd wish I had a intuitive understanding of how they work. Until then I'm stuck with just believing that the magic works out.
>>rambol+mj
Every analytical function, like f(x)=x^2-log(x+1), or signal, like a radio signal, can be rewritten as as infinite sum of sines and cosines. The Fourier transform helps you break down these components for you