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Frequency Division Multiplexing - Mastergroup 3 - Topic on telecomms

  1. Apr 8, 2013 #1
    Frequency Division Multiplexing - "Mastergroup 3" - Topic on telecomms

    1. The problem statement, all variables and given/known data
    What is the frequency output of the mastergroup combining network for a signal of 552kHz to be translated using mastergroup 3?


    2. Relevant equations
    Mastergroup Spectrum:
    For AT&T = 564 - 3084 kHz
    For ITU-T = 812 - 2044 kHz
    Mastergroup Bandwidth
    For AT&T = 2.52 MHz
    For ITU-T = 1.232 MHz
    Mastergroup VoiceBand
    For AT&T = 600 voicebands
    For ITU-T = 500 voicebands

    [itex]f_{out}=f_{c}-f_{i}[/itex]

    3. The attempt at a solution
    The problem has already been solved by our instructor but i am having a problem understanding, Here is the solution posted:
    For mastergroup 3,
    [itex]f_{c}=8848kHz[/itex]

    [itex]f_{out}=f_{c}-f_{i}[/itex] (LSB - Lower SideBand)
    [itex]f_{out}=8848kHz-552kHz[/itex]
    [itex]f_{out}=8296kHz[/itex]

    1. What i'm having trouble is how did he get 8848kHz,? I've already listed what mastergroup consist of but i don't know if it relates to getting that value.
    2. Why did he let the frequency be translated to the lower side band?
    Thanks
     
    Last edited: Apr 8, 2013
  2. jcsd
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