Question
What is a frequency discriminator?
Answer Options
- A) An FM generator circuit
- B) A circuit for filtering closely adjacent signals
- C) An automatic band-switching circuit
- D) A circuit for detecting FM signals
Correct Answer: D
Explanation
The detection (demodulation) stage in a communications receiver converts the modulated RF or IF signal back into the original baseband signal (voice, data, etc.). For frequency-modulated signals, the detector must convert the changes in frequency back into changes in voltage that represent the original audio or data stream.
A frequency discriminator is a type of detector circuit designed specifically for detecting \text{FM} signals. It produces an output voltage that is directly proportional to the instantaneous frequency deviation of the input signal. This circuit is used in FM receivers to recover the audio signal from the frequency-modulated carrier.
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