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Homework Help: Poles and Zeros of filter

  1. May 26, 2009 #1
    1. Given equation:
    y(n) = x(n) + x(n - 2) - 0.81y(n-2)

    a) Find the poles and zeros
    b) Determine its z transfer function

    2. Z transfer:
    H(z) = (SUMOF(a(m)*z(^-m))) / (1 - SUMOF (b(m)*z (^-m)))

    3. I get the feeling that this is pretty easy, I just don't know the required method to work it out. I know how to calculate poles and zeros of the z-transfer, but am not sure how to do it for the pre-transfer filter equation ( I assume ypu don't have to first carry out a z-transfer as this is the next part of the question)

    I know the formula for z-transfer but don't have any experience in using it. I can't seem to find any suitable examples on line to help me either

    Thanks in advance for any help
  2. jcsd
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