With AM, any noise is just, well, straight noise as AM is a straight amplitude signal. FM is a phase modulation scheme, so random noise is largely discarded, a

With AM, any noise is just, well, straight noise as AM is a straight amplitude signal. FM is a phase modulation scheme, so random noise is largely discarded, as instead you have a phase tracker tracking frequency modulation. Basically AM will always have noise, but because of how simple it is unless the frequency is being totally trampled on you can get * something* from it. FM by contrast will have almost perfect tracking with very low audible noise in the output… right up until the PLL loses tracking and you lose it all.