An LTI system has the frequency response
(a) Specify the difference equation that is satisfied by the input x[n] and the output y[n].
(b) Use one of the above forms of the frequency response to determine the impulse response h[n].
(c) Show that |H(ejω)|2 = G2, where G is a constant. Determine the constant G. (This is an example of an allpass filter to be discussed in detail in Chapter 5.)
(d) If the input to the above system is x[n] = cos(0.2πn), the output should be of the form y[n] = Acos(0.2πn + θ).What are A and θ?
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