Wiley signals and systems e book TLFe BO 534

Appendix A. Solutioiis

lo

519

the Exercises

This Fouricr series correspoiicls to the first step of a ) .
7l

d) A discrrtc lowpass with cut-off freyueiiry - callpd
2'

R

half-haiid low-pass.

Solution 12.5

H2

is a Iiigh-pa,ss filter.

Solution 12.6
a) It is cvidenl'

h l ? l spectrum X(gw) that X ( J W ' )= 0 for
7r
a t the nycluist rate, T = - miist be choseri.

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> u7.To sample

l ~ j l