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  1. To provide two or more voice circuit with the same carrier, it is necessary to use—
    1. ISB (Independent sideband)
    2. Carrier re-insertion
    3. SSB with pilot carrier
    4. None of these
Correct Option: A

As we know that both the sidebands have same information therefore, one sideband can be filtered out. In the place of the sideband eliminated a different sideband obtained by modulating a different signal on the same carrier is added. This is known as independent sideband as the two sidebands carry the different information. The principal application of ISB is applied in FDM. Multiplexing means simultaneous transmission of a number of base band signal on a common transmission channel, by the process of frequency translation.



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