Consider the cascade of discrete-time systems in Figure P2.73. The time-reversal systems are defined by the equations f [n] = e[−n] and y[n] = g[−n]. Assume throughout the problem that x[n] and h1[n] are real sequences.
(a) Express E (ejω), F(ejω),G(ejω), and Y (ejω) in terms of X (ejω) and H1(ejω).
(b) The result from part (a) should convince you that the overall system is LTI. Find the frequency response H(ejω) of the overall system.
(c) Determine an expression for the impulse response h[n] of the overall system in terms of h1[n].
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