Discussion
Two angle-modulated signals carry the same message at two different audio frequencies.
| Scheme | Index at 1 kHz | Index at 4 kHz |
|---|---|---|
| FM | 12 | 3 |
| PM | 6 | 6 |
What does the table demonstrate?
Answer: C
Reading across, the PM index holds at six while the FM index falls from twelve to three, exactly as the definitions require: FM divides by the message frequency and PM does not. The second option inverts the finding. Both falling contradicts the PM row. And PM has the smaller index at 1 kHz here, so it is not uniformly larger. The table is the compact form of the single most examinable difference between the two schemes. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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