communication-systems Question 34
Question: Q. 2. (i) How is amplitude modulation achieved ?
(ii) The frequencies of two side bands in an
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Solution:
Ans. (i) Amplitude modulation can be achieved by applying the message signal, and the carrier wave, to a non linear (square law device) followed by a band pass filter.
(Alternatively, The student may just draw the block diagram.)
(Alternatively, Amplitude modulation is achieved by superposing a message signal on a carrier wave in a way that causes the amplitude of the carrier wave to change in accordance with the message signal.) (ii) Frequencies of side bands are :
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