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How to find the phase shift and amplitude ratio

  1. Mar 6, 2013 #1
    i am looking for the amplitude ratio and phase shift of this graph? could someone explain me how to obtain these results from this type of graph?
    0.40Hz.gif

    thank you
     
  2. jcsd
  3. Mar 6, 2013 #2
    See the first diagram here regarding phase:

    http://en.wikipedia.org/wiki/Phase_(waves [Broken])


    There is no universal 'amplitide ratio'.....you have to explain what you seek....
    Some alternatives are here:

    http://en.wikipedia.org/wiki/Wave_amplitude
     
    Last edited by a moderator: May 6, 2017
  4. Mar 6, 2013 #3
    i have already seen these but still i have no clue for the specific graph. i have more complicated graphs but not as complicate as this one.. i cant the results for this one..

    if any one has further instruction please post here. thank you
     
  5. Mar 6, 2013 #4

    olivermsun

    User Avatar
    Science Advisor

    Take the Fourier transforms of the input and output and compute the cross-spectrum?
     
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