Zoom-frequency analysis Consider the system in Fig. P11.31(a). (a) Sketch the...

Zoom-frequency analysis Consider the system in Fig. P11.31(a).

(a) Sketch the spectrum of the signal if the input signal x(n) has the spectrum shown in Fig. P11.31(b).

(b) Suppose that we are interested in the analysis of the frequencies in the band , where and Determine the cutoff of a lowpass filter and the decimation factor D required to retain the information contained in this band of frequencies.