Wiley signals and systems e book TLFe BO 307

a) Is t h e sigiral a high-pass,
real?

;I

low-pass, or a btliid-pass slgrlitl? Is it ronqlex or

h) Is rri1,ic;tl sarnpling possible'!

c ) I)raw the spectnmi X , ( j w ) o€the sarriplcd signal lor T , = $.Tz -

r, = 0.2 x.

8ancl

Wli

ie')

Exercise 11.22
Show that the irnpulsc. response of the ideal iriterpolalioii filler for ciitically sampled real banti-pass sigrials (11.44) 1)ecornesthe 1ow-p.a~~
case (1 1.35) for " ~ ' ( 1T 0.

Exercise 11.23

A signal ~ ( t )band-limited
,
to f , = '20 IrHz is vritically sampled at, f r c y ~ ~ f(,.
~~cy
The non-ideal proprrties of t h sampling
~

are represerrted by the apertme f L i n C t i o K i
t
13.- for -r7-

a(t)=

t

1--

0

z

for O < ( t < T
olherwisc .