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Pre-emphasis is used to amplify _________ frequencies.

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Pre-emphasis is used to amplify _________ frequencies.

(a) low

(b) high

(c) both low and high

(d) local oscillator

This question was posed to me in semester exam.

This intriguing question comes from Comparison Between FM and PM in section Noise of Analog Communications

1 Answer

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Right choice is (b) high

Explanation: Pre-emphasis is used in frequency modulated transmitters to equalize the drive power of transmitting signal in terms of deviation ratio. It is done at the transmitter. It is used to amplify high frequencies.

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