,4pperidix A Solutions to the Exercises 14 Solution 11.21 a) t o d) are real bantl-pass signals =+ check (11.42) a) no; L),,,,1,1,1 = ~ ~ 11) yes; u~!,,,,,,,, = 2Au 13wo yes; ua,mln = 2Aw = 2uo d) no; U,,,,,, : ~ ~ (a) e ) a.iicl f ) are complex bardpitss sigiiitls =+ crit.ica1sampling is alwqs possible In both cases, iL'rr,mln =? nlLl = 24) Solution 11.22 According to Ta.ble 11.1,the following holds for critical sampling of real band-pass signals: 27l T = - = ~ A ( JWith Solution 1~1.23 uo = and the above condit,ion, (11.44) becomes: