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A band-pass signal can be down-converted using(a) Sine wave(b) Cosine wave(c) Time delayed wave(d) None of the mentionedI had been asked this question in an interview for internship.This is a very interesting question from Signals topic in division Signals and Spectra of Digital Communications

Answer» CORRECT choice is (b) Cosine wave

Easy EXPLANATION: For down-conversion of a band-pass signal also cosine signal is USED and multiplied with it.


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