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For the frequency response of a band reject filter as shown in fig, the ω0 is:  

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  1. ω0(ω1.ω2)
  3. ω0(ω1 -  ω2)

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Frequency Response of Band Reject filter is given by:

Now above magnitude response can be obtained by the following scheme:

The combination of the frequency response of LPF with frequency f1 with HPF with frequency f2, for  f2 > f1 will be:

 

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