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Homework Help: New to the forums need some help with signal analysis

  1. Oct 2, 2011 #1
    Im taking This class EEL3135 and im very lost and confused as to how to study or where to find resources to understand the material.

    does anybody know of a good website for beginner signal analysis? or a good reference ebook etc to help me out with it? the ones i seen are far too advanced and complicated for the stuff we doing.

    1. The problem statement, all variables and given/known data
    here is the problem im looking at.
    a.Determine a formula for x(t) as the real part of a sum of complex exponentials.
    b.what is the fundamental period for x(t)
    c.plot the spectrum for x(t)
    X(T)=sin^3(27PI t)

    2. Relevant equations
    euler inverse cosθ=(e^θ+e^θ)/(2) i dont really understand why we use this formula

    3. The attempt at a solution

    i started for first expansion i got
    (-e^54pit)/4 +0.5+(e^-54pit)/4

    after third expansion i got
    (-e^81pit)/(8j)+(3e^27pit/8j)+(-3e^27pit)/(8j)+ (-e^81pit/8j)

    is there an easier way to do this than big expansion?
  2. jcsd
  3. Oct 3, 2011 #2
  4. Oct 30, 2011 #3
    sorry for the late reply. thanks for the links =D
  5. Sep 29, 2013 #4
    when a cosine random variable function and a noise signal are convolved the result is a random variable..but will it be a guassian function
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