SignalPrep
Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-006-005

Quel type de circuit fait varier la syntonisation du circuit résonant parallèle d'un étage d'amplification pour produire la fréquence modulée (FM)?

  1. AUn modulateur équilibré
  2. BUn mélangeur doublement équilibré
  3. CUn modulateur audio
  4. DUn modulateur de phase

Correct answer: D — Un modulateur de phase. Question tirée de la banque officielle d'ISDE.

Why

A phase modulator creates frequency modulation by shifting the phase of the carrier wave in step with the audio signal, which effectively changes the frequency over time. 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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