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Which of the following wave is known as “amplitude modulated wave” of x(t)?(a) C.x(t) (where C is a constant)(b) x(t)+y(t)(c) x(t).y(t)(d) dx(t)/dtThis question was posed to me during an online interview.I would like to ask this question from Signals, Systems and Signal Processing in portion DSP – Basic Signaling of Digital Signal Processing

Answer»

Right option is (c) x(t).y(t)

For explanation I would say: The multiplicative OPERATION is often ENCOUNTERED in analog communication, where an audio frequency signal is MULTIPLIED by a high frequency sinusoid known as carrier. The resulting signal is known as “AMPLITUDE modulated WAVE”.



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