The block diagram of C/D and D/C system is shown below. p(t) DT LTI System CT lowpass Filter Xp (t) xc(t) х Conversion of xa [n] impulse train to sequence Ha (el ya In Conversion of yp (t) sequence to impulse train yc(t) Os 2 2 A CT signal xc(t) has bilateral bandwidth of 10 kHz and its frequency spectrum is shown below. 1 w (rad/s) WM 0 OM
The DT LTI system Halein) is an ideal unity gain highpass filter with cutoff frequency of 0.27. e) (2) Sketch the frequency spectrum of ya[n] for 12 | < 31. Show important values. f) (2) Sketch the frequency spectrum of y(t). Show important values. If the CT signal xc(t) is applied to the following system, xc(t) Х yı(t) q(t) 25 us 1 t 50 - 50 0 100 (us) g) (2) Find FS coefficients of q(t) for k = -1,0,1. . h) (2) Sketch the frequency spectrum of yı(t). Show important values. =
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