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A pre emphasis circuit provides extra noise immunity by __________

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A pre emphasis circuit provides extra noise immunity by __________

(a) boosting the base frequencies

(b) amplifying the higher audio frequencies

(c) amplifying the whole audio band

(d) converting the phase modulation to FM

This question was addressed to me during an online exam.

Question is from Noise for SSB-SC topic in chapter Noise of Analog Communications

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Right choice is (b) amplifying the higher audio frequencies

The explanation is: Pre emphasis is used to improve the quality of signal at the output of data transmission. A pre emphasis circuit provides extra noise immunity noise amplifying the higher audio frequencies.

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