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.