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Discrete time spectrum, finding possible continuous-time signals.

  1. Apr 13, 2013 #1
    The discrete-time spectrum of a sampled continuous-time signal x(t) is shown in the figure above,
    where (A = 9.8exp(-j0.06π), B = 0.51π, C = -0.27π, and D = 1.9exp(-j0.41π) ).
    If the sampling frequency is 4928, which of the following continous-time signals is a possible solution for x(t).

    The following question is with respect to the diagram attached. I really struggle with these spectrum drawings. Can anyone break this problem down for me, and put me in the right direction?

    Attached Files:

  2. jcsd
  3. Apr 13, 2013 #2
    For more context, this is multiple choice with the following values:
    A. 9.80cos(1330.56πt + 0.06π) + 1.90cos(2513.28πt - 0.41π)
    B. 9.80cos(1064.45πt - 0.06π) + 1.90cos(5026.56πt - 0.41π)
    C. 9.80cos(2661.12πt - 0.06π) - 1.90cos(1759.30πt + 0.41π)
    D. 9.80cos(1330.56πt - 0.06π) + 1.90cos(2513.28πt + 0.41π)
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