z transform of x[n] = cos(Bn)u[n]

Discussion in 'Homework Help' started by hitmen, Mar 17, 2009.

  1. hitmen

    Thread Starter Active Member

    Sep 21, 2008
    159
    0
    Can anyone give me a hint on how to do it? I have seen the z table and there is no cos function for me to input...:confused::(
     
  2. vvkannan

    Active Member

    Aug 9, 2008
    138
    11
    Hello hitmen,

    cosBn = {exp( j Bn) + exp ( - jBn)}/2 and now it becomes just becomes the transform of exponentials and in the end back substitute to get the transformation in terms of cos n
     
  3. hitmen

    Thread Starter Active Member

    Sep 21, 2008
    159
    0
    ok thanks got it
     
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