3 ms·
Going back to first principles, modulating the frequency instead of the amplitude inherently makes the system less lossy. Imagine you were communicating with so
by xd1936 2y ago
Going back to first principles, modulating the frequency instead of the amplitude inherently makes the system less lossy. Imagine you were communicating with someone miles away on a hilltop, and they had a lot of data to convey. Would you find it easier to distinguish signal vs. noise if the light was increasing and decreasing rapidly in brightness (AM) or color (FM)?
- pkolaczk 2y agoIf you AM modulate the carrier f0 by a single tone f1, you get a spectrum with only three tones: f0 - f1, f0, f0 + f1. If you FM modulate it, well the thing gets much more complex - depending on the depth of modulation you can get a much wider spectrum than from f0-f1 to f0+f1. So it is hard to compare. Your FM modulated signal may indeed be more resilient to noise but will require wider channel to be properly transmitted. I haven’t seen a convincing explanation if FM would be really that better than AM if both were given exactly the same channel width.