Amateur Extra › E7 Practical Circuits › E7E05
E7E05
What is added to an FM speech channel to boost the higher audio frequencies?
Pick an answer to check it.
Answer: D. A pre-emphasis network
Pre-emphasis boosts higher audio frequencies at the transmitter to improve signal-to-noise ratio. The receiver uses de-emphasis to restore normal audio balance.
Tip: Pre-emphasis at TX, de-emphasis at RX.