Physics · Communication Systems
Which of the following is a key characteristic of narrowband frequency modulation (FM) in comparison to wideband FM?
- 1Narrowband FM has a higher bandwidth because it includes more sidebands.
- 2In narrowband FM, the frequency deviation Δf is small relative to the modulating frequency fm, leading to a narrower bandwidth.✓
- 3In narrowband FM, the instantaneous frequency of the modulated signal remains completely constant.
- 4Narrowband FM signals are primarily used for commercial high-fidelity broadcasting due to their larger bandwidth efficiency.
Correct answer
In narrowband FM, the frequency deviation Δf is small relative to the modulating frequency fm, leading to a narrower bandwidth.
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