As a newbie I am trying to understand I and Q modulation and demodulation. So from what I read the I and Q components of a signal separately mix with RF signals that are 90 degrees out of phase with each other and then the summation is transmitted as an RF signal.
So let's say I am listening to a voice of a reporter via FM radio. The reporter's sound wave gets converted to electricity with a microphone and then presumably gets converted to EM wave with an antenna. I am kind of lost where modulation happens and how would his sound voice gets divided to I and Q before modulation. Is it done mathematically and digitally?