Science · 6 pages · 12 min
Why AM and FM are different encodings
AM writes the message on the strength of the wave, and FM writes it on the frequency.
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From the opening
AM and FM are different encodings because one stores the message in the strength of the carrier and the other stores it in the carrier frequency. The same voice can ride either way, and the receiver has to know which variation to read. The opening covers strength wiggles versus frequency wiggles, why static hits AM harder, and the abrupt dropout of weak FM.
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Inside
- Strength wiggles versus frequency wiggles
- Why static hits AM harder
- The abrupt dropout of weak FM
- Channel width is part of FM
- Where the idea stops applying
- A distinction worth keeping
Sources
- Amplitude modulation of a carrier envelope
- Wideband frequency modulation and limiter capture