How do siginals store data? In the case of a digital siginal, it can have a state of high (1) or low(0), so I assume after a set amount of time (e.g. 1 microsecond?) the receiver checks the value and interprets it using the binary system. Example: low-time passes-low-time passes-high-time passes low would give 0010 which could be interpreted by a computer?
What I really don't get is analog signals because the wave is continuous, how can any data be obtained from them? Is it that the receiver thinks "ok, this wave has an amplitude of 5 so that means the letter 'D' and now the wave has changed to and amplitude of 6 so that's '!'"?