5 14 ,4pperidix A Solutions to the Exercises
Solution 11.21
a) t o d) are real bantl-pass signals =+ check (11.42)
a) no; L),,,, 1,,1,1 = 3 8 ~ ~
11) yes; u~!,,,,,,,, = 2Au 1 3wo
( a ) yes; ua,mln = 2Aw = 2uo
d) no; U,,,,,, : 2 2 ~ ~
both cases, iL'rr,mln =? n l L l= 24)
Solution 11.22
According t o Ta.ble 11.1, the following holds for critical sampling of real band-pass signals:
27l
T
= - = ~ A ( J With uo = 0 and the above condit,ion, (11.44) becomes:
Solution 1~1.23