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?
- AA pre-emphasis network
- BAn audio prescaler
- CA heterodyne suppressor
- DA 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 is section A-006 of the Advanced exam: Receivers: superheterodyne design, selectivity, sensitivity, images, AGC and noise.
Drill A-006 — free, no account