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Pre-emphasis circuit is used ________

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Pre-emphasis circuit is used ________

(a) before detection

(b) after detection

(c) before encoding

(d) after encoding

This question was addressed to me in final exam.

My question is taken from Superhetrodyne Receiver topic in section Receivers & Transducers of Analog Communications

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Right choice is (c) before encoding

For explanation: Pre-emphasis is used in frequency modulated or phase modulated transmitters to equalize the drive power of transmitting signal in terms of deviation ratio. It is done at the transmitter. Its circuit is used before modulation.

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