I recall reading that it is possible to frequency modulate a low frequency with a higher one, as opposed to the usual other way around.
For example, FM a 100Hz sinewave modulated by a 1KHz sinewave.
Does anyone have any idea how this would work in practice?
I generated this in CoolEdit (audio waveform editor) and it does not look like a normal FM signal, of course. The high frequency just rides upon the lower one as a superimposed AM.
Is that all there is to it?
Robert