Multiplexers and Subcarriers Quiz
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Questions and Answers

What is the purpose of using multiplexers?

  • To restrict information to specific frequency bands
  • To separate channels of information into distinct subcarriers
  • To eliminate overlapping signals in the frequency spectrum
  • To merge multiple channels of information into a common medium (correct)

    • In the context of multiplexing, what does FDM stand for?

  • Fast Data Multiplexing
  • Fixed Data Modulation
  • Frequency Division Multiplexing (correct)
  • Frequency Domain Modulation

    • How does FDM differ from TDM?

  • FDM occurs before the final modulation, while TDM occurs after modulation
  • FDM uses frequency sharing, while TDM uses pulse techniques (correct)
  • FDM restricts information to specific channels, while TDM allows overlapping signals
  • FDM separates information channels into different subcarriers, while TDM shares frequency spectrum

    • Why is it necessary to let each channel modulate a separate subcarrier?

    <p>To eliminate overlapping signals in the frequency spectrum</p> Signup and view all the answers

    What is the scheme for simultaneously transmitting multiple channels of intelligence called?

    <p>Multiplexing</p> Signup and view all the answers

    At what stage does multiplexing occur in the transmission process?

    <p>Before the final modulation of the transmitted signal</p> Signup and view all the answers

    What is the purpose of individually modulating subcarriers with an information source?

    <p>To allow for the transmission of multiple types of intelligence sources</p> Signup and view all the answers

    What does frequency division multiplexing (FDM) achieve in terms of sharing frequency bands?

    <p>It allows channels to share the assigned frequency band without mutual interference</p> Signup and view all the answers

    In a frequency division multiplexed system, how are the bandwidths of Channel 1 and Channel 2 related?

    <p>Channel 1's bandwidth ends before Channel 2's bandwidth begins</p> Signup and view all the answers

    What is the main function of a multiplexer in the transmission process?

    <p>To simultaneously translate multiple channels into the radio frequency spectrum</p> Signup and view all the answers

    What does a final modulating wave and a carrier wave produce?

    <p>A complex modulated wave</p> Signup and view all the answers

    What technique is used to allow multiple channels to share the radio frequency spectrum without mutual interference?

    <p>Frequency Division Multiplexing (FDM)</p> Signup and view all the answers

    What type of signals are contained in each channel in a frequency division multiplexed system?

    <p>Signals that are entirely contained by that channel</p> Signup and view all the answers

    How are multiple multitone channels accommodated in a single VGC?

    <p>By combining their bandwidths to fit within the VGC's capacity</p> Signup and view all the answers

    What happens in frequency translation in the context of multiplexing?

    <p>The multiplexer translates a number of channels into the radio frequency spectrum</p> Signup and view all the answers

    What term is used to describe the modulation process applied to subcarriers in a frequency division multiplexed system?

    <p>Frequency Shift Keying (FSK)</p> Signup and view all the answers

    What is the primary function of frequency-division multiplexing (FDM)?

    <p>Separating a given band of frequencies into individual channels</p> Signup and view all the answers

    Which type of system transmits several channels of voice signals on one carrier in FDM?

    <p>Multichannel system</p> Signup and view all the answers

    What does 'discrete' mean in the context of FDM?

    <p>The intelligence and the signal bearing the intelligence are separate, individual, and distinct entities</p> Signup and view all the answers

    What frequency range is considered as 'quasistatic' in information rates in FDM?

    <p>0 to 10 Hz</p> Signup and view all the answers

    What is the bandwidth requirement for intelligible speech in a voice grade channel (VGC) in FDM?

    <p>4000 Hz</p> Signup and view all the answers

    What purpose do guardbands serve in FDM?

    <p>To keep signals from overlapping into other channels and causing interference</p> Signup and view all the answers

    What is the primary difference between multichannel and multitone systems in FDM?

    <p>Multichannel systems transmit voice signals, while multitone systems transmit tone signals</p> Signup and view all the answers

    What type of system is used exclusively to send information in a binary format in FDM?

    <p>Voice frequency tone system (VFTS)</p> Signup and view all the answers

    In FDM, what does each channel modulate?

    <p>A subcarrier associated with that particular channel</p> Signup and view all the answers

    What is the bandwidth requirement for individual channels within a multitone system in FDM?

    <p>3000 to 4000 Hz</p> Signup and view all the answers

    What is the function of subcarriers in an FDM system?

    <p>To avoid overlapping by separating different channels</p> Signup and view all the answers

    What frequency is Channel 3 assigned in an FDM system with 4 VGCs at intervals of 4 kHz?

    <p>20 kHz</p> Signup and view all the answers

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