A) compress modulating signal
B) expand modulating signal
C) amplify lower frequency component of the modulating signal
D) amplify higher frequency component of the modulating signal
Correct Answer: D
Solution :
[d] Pre-emphasis of higher frequency component is required in FM-system because high frequency terms of modulating signal have small amplitude and therefore small power relative to those of low frequency term. In the reproduced program at the o/p, these high frequency terms have poor S/N ratio and at time noise may completely mask the signal at these high frequencies, so it is necessary to provide pre-emphasis of high frequencies.
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