The correct frequency response graph for a band reject filter is the second graph presented in the discussion. A band reject filter allows all frequencies to pass except those within a specified range, which in this case is between π/3 and 2π/3. The response is characterized by a value of 1 for frequencies outside this range and 0 within it, resulting in a mirrored response across the axis due to the absolute value consideration.
PREREQUISITESElectrical engineers, signal processing students, and anyone involved in designing or analyzing filters in communication systems will benefit from this discussion.