Discussion
Which quantity leaves the PM index unchanged when it varies?
Answer: D
The message frequency does not enter the PM index at all, which is the sharpest contrast with FM, where the index falls as the message frequency rises. Message amplitude and modulator sensitivity both scale the index directly, being its two factors. And the peak phase deviation is the index, so it cannot vary independently of it. This single asymmetry explains every difference in the two schemes' spectra and noise behaviour.
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