Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-008
Ce qui distingue un modulateur de phase d'un modulateur de fréquence, c'est :
- Ala fréquence centrale
- Bla désaccentuation
- Cl'inversion de fréquence
- Dla préaccentuation
Correct answer: D — la préaccentuation. Question tirée de la banque officielle d'ISDE.
Why
Pre-emphasis boosts higher audio frequencies before transmission to improve signal clarity, and this specific processing step is the key feature that distinguishes how phase modulators are often set up compared to standard frequency modulators in exam contexts. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing is section A-005 of the Advanced exam: Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.
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