Extra exam question E7E06
Subelement E7, PRACTICAL CIRCUITS· Group E7E
Why is de-emphasis used in FM communications receivers?
- A.For compatibility with transmitters using phase modulation (correct answer)
- B.To reduce impulse noise reception
- C.For higher efficiency
- D.To remove third-order distortion products
WhyDe-emphasis is used in FM communications receivers largely for compatibility with transmitters using phase modulation. De-emphasis is used in FM communications receivers largely for compatibility with transmitters using phase modulation, since PM's inherent high-frequency audio boost naturally matches up with a receiver's de-emphasis characteristic the same way true FM's pre-emphasis does, answer A. It isn't specifically there to reduce impulse noise, improve efficiency, or remove third-order distortion products, those aren't what de-emphasis is doing here.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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