An LTI discrete-time system has frequency response given by
(a) Use one of the above forms of the frequency response to obtain an equation for the impulse response h[n] of the system.
(b) From the frequency response, determine the difference equation that is satisfied by the input x[n] and the output y[n] of the system.
(c) If the input to this system is
x[n] = 4 + 2 cos(ω0n) for−∞< n < ∞,
for what value of ω0 will the output be of the form
y[n] = A = constant
for −∞ < n < ∞? What is the constant A?
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