Jerry Stuckle wrote in
:

That's useful. It ties in with things I have read about phase
modulation synthesis. At risk of opening a wild (but fun) bit of
off-topic, I wonder if given a reference carrier at precise fixed
frequency, a phase modulation technique might allow advantages to
signal transmission that FM lacks.


Not really. All phase modulation does is integrate the modulating
signal and use that to shift the phase of the carrier (which also
requires a frequency change to effect the phase change). The resulting
signal is exactly the same as if the carrier were directly frequency
modulated. The only difference is how you got there.


Ok. What made me wonder is that I read (in the context of phase modulation
for musical audio synthesis) that true FM methods can cause a frequency drift
that is avoided completely by using phase modulation. I wondered if that fact
might (at some other cost) be useful in signal transmission at RF.