I apologize in advance if the question is very basic. When I google modulation all I read are the techniques that are used to modulate a signal.
I start from basic. Let's say I am a reporter and the wave sound of my voice changes all the time, meaning its amplitude and frequency at the same time. Now from what I read in order to send this sound wave I need a carrier wave with high frequency. There are three types of modulation that can be used (AM,FM, and PM).
But how can I pick either FM or AM when the sound of my voice change its amplitude and frequency at the same time every second? I want to get the same wave sound at the receiver and I don't understand how a complicated signal can be transferred by just transferring its amplitude change to the carrier (in case of AM).