

InterviewSolution
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What is the system function for a two pole band pass filter that has the centre of its pass band at ω=π/2, zero its frequency response characteristic at ω=0 and at ω=π, and its magnitude response is 1/√2 at ω=4π/9?(a) \(0.15\frac{1-z^{-2}}{1+0.7z^{-2}}\)(b) \(0.15\frac{1+z^{-2}}{1-0.7z^{-2}}\)(c) \(0.15\frac{1-z^{-2}}{1-0.7z^{-2}}\)(d) \(0.15\frac{1+z^{-2}}{1+0.7z^{-2}}\)The question was asked during an online interview.This is a very interesting question from LTI System as Frequency Selective Filters topic in section Frequency Analysis of Signals and Systems of Digital Signal Processing |
Answer» Correct option is (a) \(0.15\frac{1-z^{-2}}{1+0.7z^{-2}}\) |
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