Exam-style question
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Modulation is used in communication systems primarily to:.
- A.Reduce the bandwidth of the transmitted signal
- B.Encode information onto a carrier wave
- C.Increase the speed of the signal
- D.Eliminate the need for a receiver
Model answer
What a good answer should say
- Encode information onto a carrier wave
Explanation
Why this works
Formula/rule: Modulation encodes information onto a carrier wave by varying its amplitude or frequency. Substitution: Information signal + carrier wave → modulated signal.
Working: The modulated signal can be transmitted and later demodulated to recover the information. Answer: Encode information onto a carrier wave.
Conclusion: This is the primary purpose of modulation.
Common mistake
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