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Question
The diagrams below depict a modulation (left) and a demodulation(right).
(a) Express y(t), u(t) and z (t).
(b) What may happen to the demodulated signal y(t) if there is a phase shift between x(t) and the carrier signal?
(c) How would you qualify the demodulation in the figure 2 above, coherent or incoherent? Justify your answer.
i. Explain the purposes of modulation and demodulation.
ii. Give 2 synonyms in electronics of modulation and demodulation.
(e) Draw a electric circuit diagram for an enveloppe detection demodulator.
(f) Give 3 real life examples of an analog signal transmission.
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A TDM signal of the type is formed by samplingM voice signals at fs = 8 kHz. If the TDM signal then modulates the amplitude of a 4-MHz carrier for radio transmission, determine the
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