Question: Q. 11. What does the term ‘Modulation’, used in communication system, mean?
Identify the two types of modulation shown here. Give two advantages of any one of these over the other.
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Solution:
Ans. Modulation is a process in which one of the characteristics (amplitude, frequency, phase) of a high frequency carrier wave is made to change in accordance with a low frequency message signal. Modulated wave 1 : Frequency Modulation
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Modulated wave 2: Amplitude Modulation $1 / 2$
Two advantages of FM over AM :
(i) Lower noise, better power efficiency.
(ii) Higher operating range
(iii) Higher fidelity reception.
[Alternatively, Two advantages of AM over FM
(i) Simple circuits are required.
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(ii) Lower frequency space for transmission. $1 / 2$
Commonly Made Error
- Few students couldn’t identify the “Frequency Modulation.”
- Many students couldn’t write the advantages of FM over AM.
