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A base-band signal can be up-converted using

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A base-band signal can be up-converted using

(a) Sine wave

(b) Cosine wave

(c) Filtering

(d) None of the mentioned

The question was asked in a national level competition.

My question is from Signals topic in section Signals and Spectra of Digital Communications

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The correct answer is (b) Cosine wave

For explanation: A base-band signal can be up-converted to band-pass filter by applying cosine wave.

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