The main purpose of pre-emphasis and de-emphasis networks in FM communication systems is to:
A) allow for a reduction in bandwidth of the FM communication channel
B) provide a near constant noise reduction capability between low and high frequency intelligence signals
C) filter out noise produced by the FM transmitter's modulator stage
D) allow for stereo broadcasts to be received by a monaural receiver

Question

Quizplus · Accepted Answer

Pre-emphasis and de-emphasis networks in FM communication systems are used to improve the signal-to-noise ratio for higher frequency signals. Pre-emphasis boosts the amplitude of higher frequency signals before modulation, and de-emphasis reduces them back to their original level at the receiver, effectively reducing the noise in those frequencies.

The Main Purpose of Pre-Emphasis and De-Emphasis Networks in FM