Chapter 4: Amplitude Modulations and Demodulations Quiz
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Questions and Answers

What is the primary purpose of modulation in communication systems?

  • To increase the power of the signal
  • To reduce the bandwidth requirement
  • To move the message signal into a specific frequency band (correct)
  • To decrease the complexity of the transmission

    • Which type of communication systems utilize digital modulation?

  • NTSC television signals
  • Second and third generation cellular phone systems (correct)
  • HDTV signals
  • AM/FM radios

    • What is the frequency band of the baseband for a telephony system?

  • 0 - 5 kHz
  • 0 - 10 kHz
  • 0 - 3 kHz (correct)
  • 0 - 1 kHz

    • Which type of communication systems does not use modulation?

    <p>Baseband communications</p> Signup and view all the answers

    What are the advantages of modulation in communication systems?

    <p>Ease of RF transmission and frequency division multiplexing</p> Signup and view all the answers

    What type of modulation results in amplitude modulation (AM)?

    <p>Angle modulation</p> Signup and view all the answers

    In baseband communication, why are dedicated user channels assigned to each user for long-distance communications?

    <p>To reduce interference between baseband signals</p> Signup and view all the answers

    What is the main reason baseband signals cannot be effectively transmitted over radio (wireless) links?

    <p>They have significant low-frequency content</p> Signup and view all the answers

    Which type of modulation allows utilization of one channel by signals through modulation and shifting of spectra to nonoverlapping bands?

    <p>Frequency modulation (FM)</p> Signup and view all the answers

    What happens when a sinusoidal signal is modulated by changing the amplitude proportionally to the message signal?

    <p>Amplitude modulation (AM)</p> Signup and view all the answers

    What type of modulation results in amplitude modulation (AM)?

    <p>Pulse code modulation</p> Signup and view all the answers

    In baseband communication, why are dedicated user channels assigned to each user for long-distance communications?

    <p>To reduce interference between baseband signals</p> Signup and view all the answers

    What is the primary purpose of modulation in communication systems?

    <p>To shift the frequency spectrum of a signal</p> Signup and view all the answers

    What happens when a sinusoidal signal is modulated by changing the amplitude proportionally to the message signal?

    <p>Amplitude modulation</p> Signup and view all the answers

    Which type of communication systems does not use modulation?

    <p>Baseband communication</p> Signup and view all the answers

    What is the primary advantage of modulation in communication systems?

    <p>Ease of RF transmission and frequency division multiplexing</p> Signup and view all the answers

    In which frequency band does baseband communication operate?

    <p>0 - 3.5 kHz</p> Signup and view all the answers

    What distinguishes carrier communications from baseband communications?

    <p>Carrier communications operate at higher frequencies than baseband communications</p> Signup and view all the answers

    Which type of communication systems utilize classic analog modulations such as amplitude modulation?

    <p>NTSC television signals</p> Signup and view all the answers

    What is the function of angle modulation in communication systems?

    <p>To shift the spectral content of the message signal to nonoverlapping bands</p> Signup and view all the answers

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