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Questions
Explain the term demodulation used in a communication system.
With reference to communication systems, what is meant by demodulation?
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Solution
Demodulation is the process of retrieving information from the carrier wave at the receiver end. It is the reverse process of modulation.
RELATED QUESTIONS
Write the functions of the following in communication systems:
Modulator
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- transmitter.
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- user of information.
- channel.
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Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?
- The sideband frequencies are 1506 kHz and 1494 kHz.
- The bandwidth required for amplitude modulation is 6 kHz.
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An audio signal is modulated by a carrier wave of 20 MHz such that the bandwidth required for modulation is 3 kHz. Could this wave be demodulated by a diode detector which has the values of R and C as
- R = 1 kΩ, C = 0.01 µF.
- R = 10 kΩ, C = 0.01 µF.
- R = 10 kΩ, C = 0.1 µF.
