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Homework Help: Design of Band Reject Filter

  1. May 19, 2017 #1
    1. The problem statement, all variables and given/known data
    br.PNG

    2. Relevant equations
    br2.jpg

    3. The attempt at a solution
    br4.jpg

    Which is the correct frequency response graph for this question? The first graph or the second one?
     
  2. jcsd
  3. May 19, 2017 #2

    scottdave

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    Band reject implies that it passes everything, except frequencies in the band. Looking at just the positive side: If it is less than pi/3 then it is 1. If it is greater than 2pi/3 then it is also 1. Elsewhere is zero. Well elsewhere is inbetween pi/3 and 2pi/3 (the band to be rejected). Since there is absolute value, you will have a mirror image of the band response across the axis.

    Which of the graphs fit this description?
     
  4. May 20, 2017 #3
    The second graph fits the description.
     
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