Advanced Qualification · A-006 Receivers · A-006-004-001
What audio shaping network is added at an FM receiver to restore proportionally attenuated lower audio frequencies?
- A A pre-emphasis network
- B An audio prescaler
- C A heterodyne suppressor
- D A de-emphasis network
Correct answer: D — A de-emphasis network. From the official ISED question bank, verified word for word.
Why
An FM receiver uses a de-emphasis network to boost the lower audio frequencies that were intentionally weakened during transmission to reduce background noise. The full explanation — and one for every question — is in Pro.
Practise this section
Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.