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Discussion :: Signals and Systems

  1. A signal m(t) is multiplied by a sinusoidal waveform of frequency fc such that
    v(t)=m(t) cos 2pfct
    If Fourier transform of m(t) is M(f), Fourier transform of v(t) will be

    2. A.
    0.5 M(f + fc)
    B.
    0.5 M(f - fc)
    C.
    0.5 M(f + fc) + 0.5 M(f - fc)
    D.
    0.5 M(f - fc) + 0.5 M(f - fc)

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    Answer : Option C

    Explanation :

    It is a modulation process. The resultant has (f + fc) and (f - fc) terms.

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