Discussion
The noise spectrum at the output of an FM discriminator is
Answer: D
A frequency discriminator differentiates phase, so its output noise rises in proportion to frequency, giving the characteristic triangular spectrum and making the top of the audio band the noisiest part. That is exactly what pre-emphasis and de-emphasis are designed to correct. A flat spectrum is what an AM detector delivers. A falling spectrum would need the opposite processing. And nothing concentrates at the deviation frequency. The triangular shape is the reason FM broadcasting uses pre-emphasis at all.
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