Discussion
A slope detector demodulates FM by
Answer: B
Tuning a resonant circuit off centre puts the signal on the slope of its response, so frequency deviation becomes amplitude variation that an ordinary envelope detector can recover. It is the simplest FM detector and the least linear. Phase comparison between two circuits is the Foster-Seeley discriminator. Zero-crossing counting is a digital-style detector. And locking an oscillator is the phase-locked loop method, which is the most linear of the four.
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