Consider the multirate system shown in Figure P4.49-1 with input x[n] and output y[n]:
where Q0(ejω) and Q1(ejω) are the frequency responses of two LTI systems. H0(ejω) and H1(ejω) are ideal lowpass and highpass filters, respectively, with cutoff frequency at π/2 as shown in Figure P4.49-2:
The overall system is LTI if Q0(ejω) and Q1(ejω) are as shown in Figure P4.49-3:
For these choices of Q0(ejω) and Q1(ejω), sketch the frequency response
of the overall system.
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