Demodulation is the reverse process of modulation, which is performed in a receiver to recover the original modulating signals. At the receiving end, the signals are generally weak due to attenuation in the channel. The receiver selects only the desired signal, rejecting the unwanted (noise) signals and amplifies the same.
Read the above passage and answer the following questions:
(i) What are the main functions of a demodulator?
(ii) Give any two examples of demodulators.
(iii) What does the phenomemom of demodulation imply in day to day life?

Explanation

(i) The main functions of a demodulator are: (a) selecting the desired signal and rejecting the unwanted signals.
(b) demodulating the desired signal and amplifying it.
(c) displaying the original modulating signal in a desired manner.
(ii) All receivers like television and radio are demodulators.
(iii) In day to day life, demodulation is so common. An aeroplane, for example carries us to our destination town.
we get off the plane and meet our loved ones. The carrier is to be left behind. In a demodulator, carrier wave
is by passed and only the original modulating signal is reproduced.