Discussion
Which application of phase modulation is most familiar in digital form?
Answer: D
Phase shift keying is phase modulation with a message restricted to discrete values, and it dominates digital radio because phase can be detected reliably at low signal-to-noise ratios. Pulse code modulation is a sampling and quantising scheme. Delta modulation encodes differences. And vestigial sideband is an amplitude technique. Recognising PSK as the digital descendant of analogue PM ties this topic to modern practice. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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