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Could someone give a simple high level explanation of what is meant by AM and FM?
To keep this as simple as possible, let’s first consider transmitting a simple sine wave. What would I do to that signal to transmit it by AM and FM?
My intuition is that if I did a simple addition of the signal to a single frequency carrier signal, that I would be doing an AM transmission. Here is my guess as to how FM would work (don’t laugh). I would transmit a pure sine wave that is the sum of the frequencies of the sent signal and the carrier signal.
If my AM intuition is right, or at least close, it is easy to see how the same technique could be applied to any signal. If my FM description is anywhere near to close, I do not see how it could be used to carry a complex signal. Does it make sense to speak of an instantaneous frequency?