Having trouble understanding them in general
In: Technology
Probably not an ELI5 answer but here goes:
The carrier is the higher frequency signal upon which a lower frequency message is sent. Amplitude Modulation (AM) has the “message signal” change in amplitude, whereas Frequency Modulation(FM) slightly changes the carrier.
“Baseband” refers to the output of mixing (multiplying) a modulated signal by its carrier, and then low pass filtering it.
You have to think about how cosines/sines/complex exponentials multiply(Eulers relation): when you “beat” a signal with its carrier, you get an output with 2 new carrier frequencies, one at 2x the carrier and one at baseband. The Low Pass Filter removes the 2x carrier.
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